🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 53 (from laksa166)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa053.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://api.jquery.com/is/\')), getAhrefsUnparsedNoserviceFromURL(\'https://api.jquery.com/is/\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/api.jquery.com\/is\/","crawl_time":1776146791,"first_indexed_time":1376636892,"http_code":200,"src_unparsed":"com,jquery!api,\/is\/ s443","src_root_hash":"657907979407719853","history_drop_reason":null,"meta_title":".is() | jQuery API Documentation","meta_descriptions":[""],"attrs_boilerpipe_text":".is( selector )\nReturns:\nBoolean\nDescription:\nCheck the current matched set of elements against a selector, element, or jQuery object and return\ntrue\nif at least one of these elements matches the given arguments.\nversion added:\n1.0\n.is( selector )\nselector\nA string containing a selector expression to match elements against.\nversion added:\n1.6\n.is( function )\nfunction\nA function used as a test for every element in the set. It accepts two arguments,\nindex\n, which is the element's index in the jQuery collection, and\nelement\n, which is the DOM element. Within the function,\nthis\nrefers to the current DOM element.\nversion added:\n1.6\n.is( selection )\nselection\nAn existing jQuery object to match the current set of elements against.\nversion added:\n1.6\n.is( elements )\nelements\nOne or more elements to match the current set of elements against.\nUnlike other filtering methods,\n.is()\ndoes not create a new jQuery object. Instead, it allows you to test the contents of a jQuery object without modification. This is often useful inside callbacks, such as event handlers.\nSuppose you have a list, with two of its items containing a child element:\n1\n2\n3\n4\n5\n<\nul\n>\n<\nli\n>\nlist\n<\nstrong\n>\nitem 1\n<\/\nstrong\n>\n<\/\nli\n>\n<\nli\n>\n<\nspan\n>\nlist item 2\n<\/\nspan\n>\n<\/\nli\n>\n<\nli\n>\nlist item 3\n<\/\nli\n>\n<\/\nul\n>\nYou can attach a click handler to the <ul> element, and then limit the code to be triggered only when a list item itself, not one of its children, is clicked:\n1\n2\n3\n4\n5\n6\n$(\n\"ul\"\n).on(\n\"click\"\n,\nfunction\n(\nevent\n)\n{\nvar\ntarget = $( event.target );\nif\n( target.is(\n\"li\"\n) ) {\ntarget.css(\n\"background-color\"\n,\n\"red\"\n);\n}\n});\nNow, when the user clicks on the word \"list\" in the first item or anywhere in the third item, the clicked list item will be given a red background. However, when the user clicks on item 1 in the first item or anywhere in the second item, nothing will occur, because in those cases the target of the event would be\n\nor\n\n, respectively.\nUsing a Function\nThe second form of this method evaluates expressions related to elements based on a function rather than a selector. For each element, if the function returns\ntrue\n,\n.is()\nreturns\ntrue\nas well. For example, given a somewhat more involved HTML snippet:\n1\n2\n3\n4\n5\n6\n7\n8\n<\nul\n>\n<\nli\n>\n<\nstrong\n>\nlist\n<\/\nstrong\n>\nitem 1 - one strong tag\n<\/\nli\n>\n<\nli\n>\n<\nstrong\n>\nlist\n<\/\nstrong\n>\nitem\n<\nstrong\n>\n2\n<\/\nstrong\n>\n-\ntwo\n<\nspan\n>\nstrong tags\n<\/\nspan\n>\n<\/\nli\n>\n<\nli\n>\nlist item 3\n<\/\nli\n>\n<\nli\n>\nlist item 4\n<\/\nli\n>\n<\nli\n>\nlist item 5\n<\/\nli\n>\n<\/\nul\n>\nYou can attach a click handler to every\n<li>\nthat evaluates the number of\n\nelements within the clicked\n<li>\nat that time like so:\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n$(\n\"li\"\n).on(\n\"click\"\n,\nfunction\n(\n)\n{\nvar\nli = $(\nthis\n),\nisWithTwo = li.is(\nfunction\n(\n)\n{\nreturn\n$(\n\"strong\"\n,\nthis\n).length ===\n2\n;\n});\nif\n( isWithTwo ) {\nli.css(\n\"background-color\"\n,\n\"green\"\n);\n}\nelse\n{\nli.css(\n\"background-color\"\n,\n\"red\"\n);\n}\n});\nExamples:\nExample 1\nShows a few ways is() can be used inside an event handler.\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n20\n21\n22\n23\n24\n25\n26\n27\n28\n29\n30\n31\n32\n33\n34\n35\n36\n37\n38\n39\n40\n41\n42\n43\n44\n45\n46\n47\n48\n49\n50\n51\n52\n53\n54\n55\n56\n57\n58\n59\n60\n61\n62\n63\n64\n65\n66\n67\n68\n69\n<!doctype\nhtml\n>\n<\nhtml\nlang\n=\n\"en\"\n>\n<\nhead\n>\n<\nmeta\ncharset\n=\n\"utf-8\"\n>\n<\ntitle\n>\nis demo\n<\/\ntitle\n>\n<\nstyle\n>\ndiv\n{\nwidth\n:\n60px\n;\nheight\n:\n60px\n;\nmargin\n:\n5px\n;\nfloat\n: left;\nborder\n:\n4px\noutset;\nbackground\n: green;\ntext-align\n: center;\nfont-weight\n: bolder;\ncursor\n: pointer;\n}\n.blue\n{\nbackground\n: blue;\n}\n.red\n{\nbackground\n: red;\n}\nspan\n{\ncolor\n: white;\nfont-size\n:\n16px\n;\n}\np\n{\ncolor\n: red;\nfont-weight\n: bolder;\nbackground\n: yellow;\nmargin\n:\n3px\n;\nclear\n: left;\ndisplay\n: none;\n}\n<\/\nstyle\n>\n<\nscript\nsrc\n=\n\"https:\/\/code.jquery.com\/jquery-4.0.0.js\"\n>\n<\/\nscript\n>\n<\/\nhead\n>\n<\nbody\n>\n<\ndiv\n>\n<\/\ndiv\n>\n<\ndiv\nclass\n=\n\"blue\"\n>\n<\/\ndiv\n>\n<\ndiv\n>\n<\/\ndiv\n>\n<\ndiv\nclass\n=\n\"red\"\n>\n<\/\ndiv\n>\n<\ndiv\n>\n<\nbr\n\/>\n<\nspan\n>\nPeter\n<\/\nspan\n>\n<\/\ndiv\n>\n<\ndiv\nclass\n=\n\"blue\"\n>\n<\/\ndiv\n>\n<\np\n>\n&nbsp;\n<\/\np\n>\n<\nscript\n>\n$(\n\"div\"\n).one(\n\"click\"\n,\nfunction\n(\n)\n{\nif\n( $(\nthis\n).is(\n\":first-child\"\n) ) {\n$(\n\"p\"\n).text(\n\"It's the first div.\"\n);\n}\nelse\nif\n( $(\nthis\n).is(\n\".blue,.red\"\n) ) {\n$(\n\"p\"\n).text(\n\"It's a blue or red div.\"\n);\n}\nelse\nif\n( $(\nthis\n).is(\n\":contains('Peter')\"\n) ) {\n$(\n\"p\"\n).text(\n\"It's Peter!\"\n);\n}\nelse\n{\n$(\n\"p\"\n).html(\n\"It's nothing special<\/em>.\"\n);\n}\n$(\n\"p\"\n).hide().slideDown(\n\"slow\"\n);\n$(\nthis\n).css({\n\"border-style\"\n:\n\"inset\"\n,\ncursor\n:\n\"default\"\n});\n});\n<\/\nscript\n>\n<\/\nbody\n>\n<\/\nhtml\n>\nDemo:\nExample 2\nReturns true, because the parent of the input is a form element.\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n20\n21\n22\n23\n24\n25\n26\n<!doctype\nhtml\n>\n<\nhtml\nlang\n=\n\"en\"\n>\n<\nhead\n>\n<\nmeta\ncharset\n=\n\"utf-8\"\n>\n<\ntitle\n>\nis demo\n<\/\ntitle\n>\n<\nstyle\n>\ndiv\n{\ncolor\n: red;\n}\n<\/\nstyle\n>\n<\nscript\nsrc\n=\n\"https:\/\/code.jquery.com\/jquery-4.0.0.js\"\n>\n<\/\nscript\n>\n<\/\nhead\n>\n<\nbody\n>\n<\nform\n>\n<\ninput\ntype\n=\n\"checkbox\"\n>\n<\/\nform\n>\n<\ndiv\n>\n<\/\ndiv\n>\n<\nscript\n>\nvar\nisFormParent = $(\n\"input[type='checkbox']\"\n).parent().is(\n\"form\"\n);\n$(\n\"div\"\n).text(\n\"isFormParent = \"\n+ isFormParent );\n<\/\nscript\n>\n<\/\nbody\n>\n<\/\nhtml\n>\nDemo:\nExample 3\nReturns false, because the parent of the input is a p element.\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n20\n21\n22\n23\n24\n25\n26\n<!doctype\nhtml\n>\n<\nhtml\nlang\n=\n\"en\"\n>\n<\nhead\n>\n<\nmeta\ncharset\n=\n\"utf-8\"\n>\n<\ntitle\n>\nis demo\n<\/\ntitle\n>\n<\nstyle\n>\ndiv\n{\ncolor\n: red;\n}\n<\/\nstyle\n>\n<\nscript\nsrc\n=\n\"https:\/\/code.jquery.com\/jquery-4.0.0.js\"\n>\n<\/\nscript\n>\n<\/\nhead\n>\n<\nbody\n>\n<\nform\n>\n<\np\n>\n<\ninput\ntype\n=\n\"checkbox\"\n>\n<\/\np\n>\n<\/\nform\n>\n<\ndiv\n>\n<\/\ndiv\n>\n<\nscript\n>\nvar\nisFormParent = $(\n\"input[type='checkbox']\"\n).parent().is(\n\"form\"\n);\n$(\n\"div\"\n).text(\n\"isFormParent = \"\n+ isFormParent );\n<\/\nscript\n>\n<\/\nbody\n>\n<\/\nhtml\n>\nDemo:\nExample 4\nChecks against an existing collection of alternating list elements. Blue, alternating list elements slide up while others turn red.\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n20\n21\n22\n23\n24\n25\n26\n27\n28\n29\n30\n31\n32\n33\n34\n35\n<!doctype\nhtml\n>\n<\nhtml\nlang\n=\n\"en\"\n>\n<\nhead\n>\n<\nmeta\ncharset\n=\n\"utf-8\"\n>\n<\ntitle\n>\nis demo\n<\/\ntitle\n>\n<\nstyle\n>\nli\n{\ncursor\n: pointer;\n}\n<\/\nstyle\n>\n<\nscript\nsrc\n=\n\"https:\/\/code.jquery.com\/jquery-4.0.0.js\"\n>\n<\/\nscript\n>\n<\/\nhead\n>\n<\nbody\n>\n<\nul\nid\n=\n\"browsers\"\n>\n<\nli\n>\nChrome\n<\/\nli\n>\n<\nli\n>\nSafari\n<\/\nli\n>\n<\nli\n>\nFirefox\n<\/\nli\n>\n<\nli\n>\nOpera\n<\/\nli\n>\n<\/\nul\n>\n<\nscript\n>\nvar\nalt = $(\n\"#browsers li:nth-child(2n)\"\n).css(\n\"background\"\n,\n\"#0ff\"\n);\n$(\n\"li\"\n).on(\n\"click\"\n,\nfunction\n(\n)\n{\nvar\nli = $(\nthis\n);\nif\n( li.is( alt ) ) {\nli.slideUp();\n}\nelse\n{\nli.css(\n\"background\"\n,\n\"red\"\n);\n}\n});\n<\/\nscript\n>\n<\/\nbody\n>\n<\/\nhtml\n>\nDemo:\nExample 5\nAn alternate way to achieve the above example using an element rather than a jQuery object. Checks against an existing collection of alternating list elements. Blue, alternating list elements slide up while others turn red.\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n20\n21\n22\n23\n24\n25\n26\n27\n28\n29\n30\n31\n32\n33\n34\n<!doctype\nhtml\n>\n<\nhtml\nlang\n=\n\"en\"\n>\n<\nhead\n>\n<\nmeta\ncharset\n=\n\"utf-8\"\n>\n<\ntitle\n>\nis demo\n<\/\ntitle\n>\n<\nstyle\n>\nli\n{\ncursor\n: pointer;\n}\n<\/\nstyle\n>\n<\nscript\nsrc\n=\n\"https:\/\/code.jquery.com\/jquery-4.0.0.js\"\n>\n<\/\nscript\n>\n<\/\nhead\n>\n<\nbody\n>\n<\nul\nid\n=\n\"browsers\"\n>\n<\nli\n>\nChrome\n<\/\nli\n>\n<\nli\n>\nSafari\n<\/\nli\n>\n<\nli\n>\nFirefox\n<\/\nli\n>\n<\nli\n>\nOpera\n<\/\nli\n>\n<\/\nul\n>\n<\nscript\n>\nvar\nalt = $(\n\"#browsers li:nth-child(2n)\"\n).css(\n\"background\"\n,\n\"#0ff\"\n);\n$(\n\"li\"\n).on(\n\"click\"\n,\nfunction\n(\n)\n{\nif\n( alt.is(\nthis\n) ) {\n$(\nthis\n).slideUp();\n}\nelse\n{\n$(\nthis\n).css(\n\"background\"\n,\n\"red\"\n);\n}\n});\n<\/\nscript\n>\n<\/\nbody\n>\n<\/\nhtml\n>\nDemo:","attrs_markdown":"- [jQuery](https:\/\/jquery.com\/ \"jQuery\")\n- [jQuery UI](https:\/\/jqueryui.com\/ \"jQuery UI\")\n- [jQuery Mobile](https:\/\/jquerymobile.com\/ \"jQuery Mobile\")\n- [Sizzle](https:\/\/sizzlejs.com\/ \"Sizzle\")\n- [QUnit](https:\/\/qunitjs.com\/ \"QUnit\")\n\n- [Plugins](https:\/\/plugins.jquery.com\/)\n- [Contribute](https:\/\/contribute.jquery.org\/)\n - [CLA](https:\/\/cla.openjsf.org\/)\n - [Style Guides](https:\/\/contribute.jquery.org\/style-guide\/)\n - [Bug Triage](https:\/\/contribute.jquery.org\/triage\/)\n - [Code](https:\/\/contribute.jquery.org\/code\/)\n - [Documentation](https:\/\/contribute.jquery.org\/documentation\/)\n - [Web Sites](https:\/\/contribute.jquery.org\/web-sites\/)\n- [Events](https:\/\/events.jquery.org\/)\n- [Support](https:\/\/jquery.com\/support\/)\n - [Learning Center](https:\/\/learn.jquery.com\/)\n - [Chat](https:\/\/jquery.com\/support\/)\n - [Stack Overflow](https:\/\/stackoverflow.com\/tags\/jquery\/info)\n - [Report a bug](https:\/\/contribute.jquery.org\/bug-reports\/)\n- [OpenJS Foundation](https:\/\/openjsf.org\/)\n - [Join](https:\/\/openjsf.org\/join)\n - [Members](https:\/\/openjsf.org\/members)\n - [jQuery Team](https:\/\/jquery.com\/team)\n - [Governance](https:\/\/openjsf.org\/governance)\n - [Conduct](https:\/\/code-of-conduct.openjsf.org\/)\n - [Projects](https:\/\/openjsf.org\/projects)\n\n## [jQuery API Documentation](https:\/\/jquery.com\/ \"jQuery API Documentation\")\nNavigation\n\n- [Download](https:\/\/jquery.com\/download\/)\n- [API Documentation](https:\/\/api.jquery.com\/)\n- [Blog](https:\/\/blog.jquery.com\/)\n- [Plugins](https:\/\/plugins.jquery.com\/)\n- [Browser Support](https:\/\/jquery.com\/browser-support\/)\n- [Version Support](https:\/\/jquery.com\/support\/)\n\n# .is()\n***\nCategories: [Traversing](https:\/\/api.jquery.com\/category\/traversing\/) \\> [Filtering](https:\/\/api.jquery.com\/category\/traversing\/filtering\/)\n\n## .is( selector )Returns: [Boolean](http:\/\/api.jquery.com\/Types\/#Boolean)\n**Description:** Check the current matched set of elements against a selector, element, or jQuery object and return `true` if at least one of these elements matches the given arguments.\n\n- #### version added: [1\\.0](https:\/\/api.jquery.com\/category\/version\/1.0\/)[.is( selector )](https:\/\/api.jquery.com\/is\/#is-selector)\n - **selector**\n Type: [Selector](http:\/\/api.jquery.com\/Types\/#Selector)\n A string containing a selector expression to match elements against.\n- #### version added: [1\\.6](https:\/\/api.jquery.com\/category\/version\/1.6\/)[.is( function )](https:\/\/api.jquery.com\/is\/#is-function)\n - **function**\n Type: [Function](http:\/\/api.jquery.com\/Types\/#Function)( [Integer](http:\/\/api.jquery.com\/Types\/#Integer) index, [Element](http:\/\/api.jquery.com\/Types\/#Element) element ) =\\> [Boolean](http:\/\/api.jquery.com\/Types\/#Boolean)\n A function used as a test for every element in the set. It accepts two arguments, `index`, which is the element's index in the jQuery collection, and `element`, which is the DOM element. Within the function, `this` refers to the current DOM element.\n- #### version added: [1\\.6](https:\/\/api.jquery.com\/category\/version\/1.6\/)[.is( selection )](https:\/\/api.jquery.com\/is\/#is-selection)\n - **selection**\n Type: [jQuery](http:\/\/api.jquery.com\/Types\/#jQuery)\n An existing jQuery object to match the current set of elements against.\n- #### version added: [1\\.6](https:\/\/api.jquery.com\/category\/version\/1.6\/)[.is( elements )](https:\/\/api.jquery.com\/is\/#is-elements)\n - **elements**\n Type: [Element](http:\/\/api.jquery.com\/Types\/#Element)\n One or more elements to match the current set of elements against.\n\nUnlike other filtering methods, `.is()` does not create a new jQuery object. Instead, it allows you to test the contents of a jQuery object without modification. This is often useful inside callbacks, such as event handlers.\n\nSuppose you have a list, with two of its items containing a child element:\n\n| | |\n|---|---|\n| 1 2 3 4 5 | |\n\nYou can attach a click handler to the \\<ul\\> element, and then limit the code to be triggered only when a list item itself, not one of its children, is clicked:\n\n| | |\n|---|---|\n| 1 2 3 4 5 6 | |\n\nNow, when the user clicks on the word \"list\" in the first item or anywhere in the third item, the clicked list item will be given a red background. However, when the user clicks on item 1 in the first item or anywhere in the second item, nothing will occur, because in those cases the target of the event would be `` or ``, respectively.\n\n#### Using a Function\nThe second form of this method evaluates expressions related to elements based on a function rather than a selector. For each element, if the function returns `true`, `.is()` returns `true` as well. For example, given a somewhat more involved HTML snippet:\n\n| | |\n|---|---|\n| 1 2 3 4 5 6 7 8 | |\n\nYou can attach a click handler to every `<li>` that evaluates the number of `` elements within the clicked `<li>` at that time like so:\n\n| | |\n|---|---|\n| 1 2 3 4 5 6 7 8 9 10 11 | |\n\n## Examples:\n### Example 1\nShows a few ways is() can be used inside an event handler.\n\n| | |\n|---|---|\n| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | |\n#### Demo:\n\n### Example 2\nReturns true, because the parent of the input is a form element.\n\n| | |\n|---|---|\n| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | |\n#### Demo:\n\n### Example 3\nReturns false, because the parent of the input is a p element.\n\n| | |\n|---|---|\n| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | |\n#### Demo:\n\n### Example 4\nChecks against an existing collection of alternating list elements. Blue, alternating list elements slide up while others turn red.\n\n| | |\n|---|---|\n| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | |\n#### Demo:\n\n### Example 5\nAn alternate way to achieve the above example using an element rather than a jQuery object. Checks against an existing collection of alternating list elements. Blue, alternating list elements slide up while others turn red.\n\n| | |\n|---|---|\n| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | |\n#### Demo:\n\n- [Ajax](https:\/\/api.jquery.com\/category\/ajax\/)\n - [Global Ajax Event Handlers](https:\/\/api.jquery.com\/category\/ajax\/global-ajax-event-handlers\/)\n - [Helper Functions](https:\/\/api.jquery.com\/category\/ajax\/helper-functions\/)\n - [Low-Level Interface](https:\/\/api.jquery.com\/category\/ajax\/low-level-interface\/)\n - [Shorthand Methods](https:\/\/api.jquery.com\/category\/ajax\/shorthand-methods\/)\n- [Attributes](https:\/\/api.jquery.com\/category\/attributes\/)\n- [Callbacks Object](https:\/\/api.jquery.com\/category\/callbacks-object\/)\n- [Core](https:\/\/api.jquery.com\/category\/core\/)\n- [CSS](https:\/\/api.jquery.com\/category\/css\/)\n- [Data](https:\/\/api.jquery.com\/category\/data\/)\n- [Deferred Object](https:\/\/api.jquery.com\/category\/deferred-object\/)\n- [Deprecated](https:\/\/api.jquery.com\/category\/deprecated\/)\n - [Deprecated 1.3](https:\/\/api.jquery.com\/category\/deprecated\/deprecated-1.3\/)\n - [Deprecated 1.7](https:\/\/api.jquery.com\/category\/deprecated\/deprecated-1.7\/)\n - [Deprecated 1.8](https:\/\/api.jquery.com\/category\/deprecated\/deprecated-1.8\/)\n - [Deprecated 1.9](https:\/\/api.jquery.com\/category\/deprecated\/deprecated-1.9\/)\n - [Deprecated 1.10 & 2.0](https:\/\/api.jquery.com\/category\/deprecated\/deprecated-1.10-and-2.0\/)\n - [Deprecated 3.0](https:\/\/api.jquery.com\/category\/deprecated\/deprecated-3.0\/)\n - [Deprecated 3.2](https:\/\/api.jquery.com\/category\/deprecated\/deprecated-3.2\/)\n - [Deprecated 3.3](https:\/\/api.jquery.com\/category\/deprecated\/deprecated-3.3\/)\n - [Deprecated 3.4](https:\/\/api.jquery.com\/category\/deprecated\/deprecated-3.4\/)\n - [Deprecated 3.5](https:\/\/api.jquery.com\/category\/deprecated\/deprecated-3.5\/)\n - [Deprecated 3.7](https:\/\/api.jquery.com\/category\/deprecated\/deprecated-3.7\/)\n- [Dimensions](https:\/\/api.jquery.com\/category\/dimensions\/)\n- [Effects](https:\/\/api.jquery.com\/category\/effects\/)\n - [Basics](https:\/\/api.jquery.com\/category\/effects\/basics\/)\n - [Custom](https:\/\/api.jquery.com\/category\/effects\/custom-effects\/)\n - [Fading](https:\/\/api.jquery.com\/category\/effects\/fading\/)\n - [Sliding](https:\/\/api.jquery.com\/category\/effects\/sliding\/)\n- [Events](https:\/\/api.jquery.com\/category\/events\/)\n - [Browser Events](https:\/\/api.jquery.com\/category\/events\/browser-events\/)\n - [Document Loading](https:\/\/api.jquery.com\/category\/events\/document-loading\/)\n - [Event Handler Attachment](https:\/\/api.jquery.com\/category\/events\/event-handler-attachment\/)\n - [Event Object](https:\/\/api.jquery.com\/category\/events\/event-object\/)\n - [Form Events](https:\/\/api.jquery.com\/category\/events\/form-events\/)\n - [Keyboard Events](https:\/\/api.jquery.com\/category\/events\/keyboard-events\/)\n - [Mouse Events](https:\/\/api.jquery.com\/category\/events\/mouse-events\/)\n- [Forms](https:\/\/api.jquery.com\/category\/forms\/)\n- [Internals](https:\/\/api.jquery.com\/category\/internals\/)\n- [Manipulation](https:\/\/api.jquery.com\/category\/manipulation\/)\n - [Class Attribute](https:\/\/api.jquery.com\/category\/manipulation\/class-attribute\/)\n - [Copying](https:\/\/api.jquery.com\/category\/manipulation\/copying\/)\n - [DOM Insertion, Around](https:\/\/api.jquery.com\/category\/manipulation\/dom-insertion-around\/)\n - [DOM Insertion, Inside](https:\/\/api.jquery.com\/category\/manipulation\/dom-insertion-inside\/)\n - [DOM Insertion, Outside](https:\/\/api.jquery.com\/category\/manipulation\/dom-insertion-outside\/)\n - [DOM Removal](https:\/\/api.jquery.com\/category\/manipulation\/dom-removal\/)\n - [DOM Replacement](https:\/\/api.jquery.com\/category\/manipulation\/dom-replacement\/)\n - [General Attributes](https:\/\/api.jquery.com\/category\/manipulation\/general-attributes\/)\n - [Style Properties](https:\/\/api.jquery.com\/category\/manipulation\/style-properties\/)\n- [Miscellaneous](https:\/\/api.jquery.com\/category\/miscellaneous\/)\n - [Collection Manipulation](https:\/\/api.jquery.com\/category\/miscellaneous\/collection-manipulation\/)\n - 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All rights reserved. See [jQuery License](https:\/\/jquery.com\/license\/) for more information. The [OpenJS Foundation](https:\/\/openjsf.org\/) has registered trademarks and uses trademarks. For a list of trademarks of the [OpenJS Foundation](https:\/\/openjsf.org\/), please see our [Trademark Policy](https:\/\/trademark-policy.openjsf.org\/) and [Trademark List](https:\/\/trademark-list.openjsf.org\/). Trademarks and logos not indicated on the [list of OpenJS Foundation trademarks](https:\/\/trademark-list.openjsf.org\/) are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them. OpenJS Foundation [Terms of Use](https:\/\/terms-of-use.openjsf.org\/), [Privacy](https:\/\/privacy-policy.openjsf.org\/), [Code of Conduct](https:\/\/code-of-conduct.openjsf.org\/), and [Cookie](https:\/\/www.linuxfoundation.org\/cookies) Policies also apply.\n\n[Web hosting by Digital Ocean](https:\/\/www.digitalocean.com\/) \\| [CDN by Fastly](https:\/\/www.fastly.com\/) \\| [Powered by WordPress](https:\/\/wordpress.org\/)","attrs_readable_markdown":"## .is( selector )Returns: [Boolean](http:\/\/api.jquery.com\/Types\/#Boolean)\n**Description:** Check the current matched set of elements against a selector, element, or jQuery object and return `true` if at least one of these elements matches the given arguments.\n\n- #### version added: [1\\.0](https:\/\/api.jquery.com\/category\/version\/1.0\/)[.is( selector )](https:\/\/api.jquery.com\/is\/#is-selector)\n - **selector**\n A string containing a selector expression to match elements against.\n- #### version added: [1\\.6](https:\/\/api.jquery.com\/category\/version\/1.6\/)[.is( function )](https:\/\/api.jquery.com\/is\/#is-function)\n - **function**\n A function used as a test for every element in the set. It accepts two arguments, `index`, which is the element's index in the jQuery collection, and `element`, which is the DOM element. Within the function, `this` refers to the current DOM element.\n- #### version added: [1\\.6](https:\/\/api.jquery.com\/category\/version\/1.6\/)[.is( selection )](https:\/\/api.jquery.com\/is\/#is-selection)\n - **selection**\n An existing jQuery object to match the current set of elements against.\n- #### version added: [1\\.6](https:\/\/api.jquery.com\/category\/version\/1.6\/)[.is( elements )](https:\/\/api.jquery.com\/is\/#is-elements)\n - **elements**\n One or more elements to match the current set of elements against.\n\nUnlike other filtering methods, `.is()` does not create a new jQuery object. Instead, it allows you to test the contents of a jQuery object without modification. This is often useful inside callbacks, such as event handlers.\n\nSuppose you have a list, with two of its items containing a child element:\n\n| | |\n|---|---|\n| 1 2 3 4 5 | |\n\nYou can attach a click handler to the \\<ul\\> element, and then limit the code to be triggered only when a list item itself, not one of its children, is clicked:\n\n| | |\n|---|---|\n| 1 2 3 4 5 6 | |\n\nNow, when the user clicks on the word \"list\" in the first item or anywhere in the third item, the clicked list item will be given a red background. However, when the user clicks on item 1 in the first item or anywhere in the second item, nothing will occur, because in those cases the target of the event would be `` or ``, respectively.\n\n#### Using a Function\nThe second form of this method evaluates expressions related to elements based on a function rather than a selector. For each element, if the function returns `true`, `.is()` returns `true` as well. For example, given a somewhat more involved HTML snippet:\n\n| | |\n|---|---|\n| 1 2 3 4 5 6 7 8 | |\n\nYou can attach a click handler to every `<li>` that evaluates the number of `` elements within the clicked `<li>` at that time like so:\n\n| | |\n|---|---|\n| 1 2 3 4 5 6 7 8 9 10 11 | |\n\n## Examples:\n### Example 1\nShows a few ways is() can be used inside an event handler.\n\n| | |\n|---|---|\n| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | |\n#### Demo:\n\n### Example 2\nReturns true, because the parent of the input is a form element.\n\n| | |\n|---|---|\n| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | |\n#### Demo:\n\n### Example 3\nReturns false, because the parent of the input is a p element.\n\n| | |\n|---|---|\n| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | |\n#### Demo:\n\n### Example 4\nChecks against an existing collection of alternating list elements. Blue, alternating list elements slide up while others turn red.\n\n| | |\n|---|---|\n| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | |\n#### Demo:\n\n### Example 5\nAn alternate way to achieve the above example using an element rather than a jQuery object. Checks against an existing collection of alternating list elements. Blue, alternating list elements slide up while others turn red.\n\n| | |\n|---|---|\n| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | |\n#### Demo:","meta_canonical":null}

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Filter	Status	Condition	Details
HTTP status	PASS	`download_http_code = 200`	HTTP 200
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Page Details

Property	Value
URL	https://api.jquery.com/is/
Last Crawled	2026-04-14 06:06:31 (4 hours ago)
First Indexed	2013-08-16 07:08:12 (12 years ago)
HTTP Status Code	200
Meta Title	.is() \| jQuery API Documentation
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Boilerpipe Text	.is( selector ) Returns: Boolean Description: Check the current matched set of elements against a selector, element, or jQuery object and return true if at least one of these elements matches the given arguments. version added: 1.0 .is( selector ) selector A string containing a selector expression to match elements against. version added: 1.6 .is( function ) function A function used as a test for every element in the set. It accepts two arguments, index , which is the element's index in the jQuery collection, and element , which is the DOM element. Within the function, this refers to the current DOM element. version added: 1.6 .is( selection ) selection An existing jQuery object to match the current set of elements against. version added: 1.6 .is( elements ) elements One or more elements to match the current set of elements against. Unlike other filtering methods, .is() does not create a new jQuery object. Instead, it allows you to test the contents of a jQuery object without modification. This is often useful inside callbacks, such as event handlers. Suppose you have a list, with two of its items containing a child element: 1 2 3 4 5 < ul > < li > list < strong > item 1 </ strong > </ li > < li > < span > list item 2 </ span > </ li > < li > list item 3 </ li > </ ul > You can attach a click handler to the <ul> element, and then limit the code to be triggered only when a list item itself, not one of its children, is clicked: 1 2 3 4 5 6 $( "ul" ).on( "click" , function ( event ) { var target = $( event.target ); if ( target.is( "li" ) ) { target.css( "background-color" , "red" ); } }); Now, when the user clicks on the word "list" in the first item or anywhere in the third item, the clicked list item will be given a red background. However, when the user clicks on item 1 in the first item or anywhere in the second item, nothing will occur, because in those cases the target of the event would be <strong> or <span> , respectively. Using a Function The second form of this method evaluates expressions related to elements based on a function rather than a selector. For each element, if the function returns true , .is() returns true as well. For example, given a somewhat more involved HTML snippet: 1 2 3 4 5 6 7 8 < ul > < li > < strong > list </ strong > item 1 - one strong tag </ li > < li > < strong > list </ strong > item < strong > 2 </ strong > - two < span > strong tags </ span > </ li > < li > list item 3 </ li > < li > list item 4 </ li > < li > list item 5 </ li > </ ul > You can attach a click handler to every <li> that evaluates the number of <strong> elements within the clicked <li> at that time like so: 1 2 3 4 5 6 7 8 9 10 11 $( "li" ).on( "click" , function ( ) { var li = $( this ), isWithTwo = li.is( function ( ) { return $( "strong" , this ).length === 2 ; }); if ( isWithTwo ) { li.css( "background-color" , "green" ); } else { li.css( "background-color" , "red" ); } }); Examples: Example 1 Shows a few ways is() can be used inside an event handler. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 <!doctype html > < html lang = "en" > < head > < meta charset = "utf-8" > < title > is demo </ title > < style > div { width : 60px ; height : 60px ; margin : 5px ; float : left; border : 4px outset; background : green; text-align : center; font-weight : bolder; cursor : pointer; } .blue { background : blue; } .red { background : red; } span { color : white; font-size : 16px ; } p { color : red; font-weight : bolder; background : yellow; margin : 3px ; clear : left; display : none; } </ style > < script src = "https://code.jquery.com/jquery-4.0.0.js" > </ script > </ head > < body > < div > </ div > < div class = "blue" > </ div > < div > </ div > < div class = "red" > </ div > < div > < br /> < span > Peter </ span > </ div > < div class = "blue" > </ div > < p >   </ p > < script > $( "div" ).one( "click" , function ( ) { if ( $( this ).is( ":first-child" ) ) { $( "p" ).text( "It's the first div." ); } else if ( $( this ).is( ".blue,.red" ) ) { $( "p" ).text( "It's a blue or red div." ); } else if ( $( this ).is( ":contains('Peter')" ) ) { $( "p" ).text( "It's Peter!" ); } else { $( "p" ).html( "It's nothing <em>special</em>." ); } $( "p" ).hide().slideDown( "slow" ); $( this ).css({ "border-style" : "inset" , cursor : "default" }); }); </ script > </ body > </ html > Demo: Example 2 Returns true, because the parent of the input is a form element. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 <!doctype html > < html lang = "en" > < head > < meta charset = "utf-8" > < title > is demo </ title > < style > div { color : red; } </ style > < script src = "https://code.jquery.com/jquery-4.0.0.js" > </ script > </ head > < body > < form > < input type = "checkbox" > </ form > < div > </ div > < script > var isFormParent = $( "input[type='checkbox']" ).parent().is( "form" ); $( "div" ).text( "isFormParent = " + isFormParent ); </ script > </ body > </ html > Demo: Example 3 Returns false, because the parent of the input is a p element. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 <!doctype html > < html lang = "en" > < head > < meta charset = "utf-8" > < title > is demo </ title > < style > div { color : red; } </ style > < script src = "https://code.jquery.com/jquery-4.0.0.js" > </ script > </ head > < body > < form > < p > < input type = "checkbox" > </ p > </ form > < div > </ div > < script > var isFormParent = $( "input[type='checkbox']" ).parent().is( "form" ); $( "div" ).text( "isFormParent = " + isFormParent ); </ script > </ body > </ html > Demo: Example 4 Checks against an existing collection of alternating list elements. Blue, alternating list elements slide up while others turn red. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 <!doctype html > < html lang = "en" > < head > < meta charset = "utf-8" > < title > is demo </ title > < style > li { cursor : pointer; } </ style > < script src = "https://code.jquery.com/jquery-4.0.0.js" > </ script > </ head > < body > < ul id = "browsers" > < li > Chrome </ li > < li > Safari </ li > < li > Firefox </ li > < li > Opera </ li > </ ul > < script > var alt = $( "#browsers li:nth-child(2n)" ).css( "background" , "#0ff" ); $( "li" ).on( "click" , function ( ) { var li = $( this ); if ( li.is( alt ) ) { li.slideUp(); } else { li.css( "background" , "red" ); } }); </ script > </ body > </ html > Demo: Example 5 An alternate way to achieve the above example using an element rather than a jQuery object. Checks against an existing collection of alternating list elements. Blue, alternating list elements slide up while others turn red. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 <!doctype html > < html lang = "en" > < head > < meta charset = "utf-8" > < title > is demo </ title > < style > li { cursor : pointer; } </ style > < script src = "https://code.jquery.com/jquery-4.0.0.js" > </ script > </ head > < body > < ul id = "browsers" > < li > Chrome </ li > < li > Safari </ li > < li > Firefox </ li > < li > Opera </ li > </ ul > < script > var alt = $( "#browsers li:nth-child(2n)" ).css( "background" , "#0ff" ); $( "li" ).on( "click" , function ( ) { if ( alt.is( this ) ) { $( this ).slideUp(); } else { $( this ).css( "background" , "red" ); } }); </ script > </ body > </ html > Demo:
Markdown	- [jQuery](https://jquery.com/ "jQuery") - [jQuery UI](https://jqueryui.com/ "jQuery UI") - [jQuery Mobile](https://jquerymobile.com/ "jQuery Mobile") - [Sizzle](https://sizzlejs.com/ "Sizzle") - [QUnit](https://qunitjs.com/ "QUnit") - [Plugins](https://plugins.jquery.com/) - [Contribute](https://contribute.jquery.org/) - [CLA](https://cla.openjsf.org/) - [Style Guides](https://contribute.jquery.org/style-guide/) - [Bug Triage](https://contribute.jquery.org/triage/) - [Code](https://contribute.jquery.org/code/) - [Documentation](https://contribute.jquery.org/documentation/) - [Web Sites](https://contribute.jquery.org/web-sites/) - [Events](https://events.jquery.org/) - [Support](https://jquery.com/support/) - [Learning Center](https://learn.jquery.com/) - [Chat](https://jquery.com/support/) - [Stack Overflow](https://stackoverflow.com/tags/jquery/info) - [Report a bug](https://contribute.jquery.org/bug-reports/) - [OpenJS Foundation](https://openjsf.org/) - [Join](https://openjsf.org/join) - [Members](https://openjsf.org/members) - [jQuery Team](https://jquery.com/team) - [Governance](https://openjsf.org/governance) - [Conduct](https://code-of-conduct.openjsf.org/) - [Projects](https://openjsf.org/projects) ## [jQuery API Documentation](https://jquery.com/ "jQuery API Documentation") Navigation - [Download](https://jquery.com/download/) - [API Documentation](https://api.jquery.com/) - [Blog](https://blog.jquery.com/) - [Plugins](https://plugins.jquery.com/) - [Browser Support](https://jquery.com/browser-support/) - [Version Support](https://jquery.com/support/) # .is() * Categories: [Traversing](https://api.jquery.com/category/traversing/) \> [Filtering](https://api.jquery.com/category/traversing/filtering/) ## .is( selector )Returns: [Boolean](http://api.jquery.com/Types/#Boolean) Description: Check the current matched set of elements against a selector, element, or jQuery object and return `true` if at least one of these elements matches the given arguments. - #### version added: [1\.0](https://api.jquery.com/category/version/1.0/)[.is( selector )](https://api.jquery.com/is/#is-selector) - selector Type: [Selector](http://api.jquery.com/Types/#Selector) A string containing a selector expression to match elements against. - #### version added: [1\.6](https://api.jquery.com/category/version/1.6/)[.is( function )](https://api.jquery.com/is/#is-function) - function Type: [Function](http://api.jquery.com/Types/#Function)( [Integer](http://api.jquery.com/Types/#Integer) index, [Element](http://api.jquery.com/Types/#Element) element ) =\> [Boolean](http://api.jquery.com/Types/#Boolean) A function used as a test for every element in the set. It accepts two arguments, `index`, which is the element's index in the jQuery collection, and `element`, which is the DOM element. Within the function, `this` refers to the current DOM element. - #### version added: [1\.6](https://api.jquery.com/category/version/1.6/)[.is( selection )](https://api.jquery.com/is/#is-selection) - selection Type: [jQuery](http://api.jquery.com/Types/#jQuery) An existing jQuery object to match the current set of elements against. - #### version added: [1\.6](https://api.jquery.com/category/version/1.6/)[.is( elements )](https://api.jquery.com/is/#is-elements) - elements** Type: [Element](http://api.jquery.com/Types/#Element) One or more elements to match the current set of elements against. Unlike other filtering methods, `.is()` does not create a new jQuery object. Instead, it allows you to test the contents of a jQuery object without modification. This is often useful inside callbacks, such as event handlers. Suppose you have a list, with two of its items containing a child element: \| \| \| \|---\|---\| \| 1 2 3 4 5 \| \| You can attach a click handler to the \<ul\> element, and then limit the code to be triggered only when a list item itself, not one of its children, is clicked: \| \| \| \|---\|---\| \| 1 2 3 4 5 6 \| \| Now, when the user clicks on the word "list" in the first item or anywhere in the third item, the clicked list item will be given a red background. However, when the user clicks on item 1 in the first item or anywhere in the second item, nothing will occur, because in those cases the target of the event would be `<strong>` or `<span>`, respectively. #### Using a Function The second form of this method evaluates expressions related to elements based on a function rather than a selector. For each element, if the function returns `true`, `.is()` returns `true` as well. For example, given a somewhat more involved HTML snippet: \| \| \| \|---\|---\| \| 1 2 3 4 5 6 7 8 \| \| You can attach a click handler to every `<li>` that evaluates the number of `<strong>` elements within the clicked `<li>` at that time like so: \| \| \| \|---\|---\| \| 1 2 3 4 5 6 7 8 9 10 11 \| \| ## Examples: ### Example 1 Shows a few ways is() can be used inside an event handler. \| \| \| \|---\|---\| \| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 \| \| #### Demo: ### Example 2 Returns true, because the parent of the input is a form element. \| \| \| \|---\|---\| \| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 \| \| #### Demo: ### Example 3 Returns false, because the parent of the input is a p element. \| \| \| \|---\|---\| \| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 \| \| #### Demo: ### Example 4 Checks against an existing collection of alternating list elements. Blue, alternating list elements slide up while others turn red. \| \| \| \|---\|---\| \| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 \| \| #### Demo: ### Example 5 An alternate way to achieve the above example using an element rather than a jQuery object. Checks against an existing collection of alternating list elements. Blue, alternating list elements slide up while others turn red. \| \| \| \|---\|---\| \| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 \| \| #### Demo: - [Ajax](https://api.jquery.com/category/ajax/) - [Global Ajax Event Handlers](https://api.jquery.com/category/ajax/global-ajax-event-handlers/) - [Helper Functions](https://api.jquery.com/category/ajax/helper-functions/) - [Low-Level Interface](https://api.jquery.com/category/ajax/low-level-interface/) - [Shorthand Methods](https://api.jquery.com/category/ajax/shorthand-methods/) - [Attributes](https://api.jquery.com/category/attributes/) - [Callbacks Object](https://api.jquery.com/category/callbacks-object/) - [Core](https://api.jquery.com/category/core/) - [CSS](https://api.jquery.com/category/css/) - [Data](https://api.jquery.com/category/data/) - [Deferred Object](https://api.jquery.com/category/deferred-object/) - [Deprecated](https://api.jquery.com/category/deprecated/) - [Deprecated 1.3](https://api.jquery.com/category/deprecated/deprecated-1.3/) - 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Readable Markdown	## .is( selector )Returns: [Boolean](http://api.jquery.com/Types/#Boolean) Description: Check the current matched set of elements against a selector, element, or jQuery object and return `true` if at least one of these elements matches the given arguments. - #### version added: [1\.0](https://api.jquery.com/category/version/1.0/)[.is( selector )](https://api.jquery.com/is/#is-selector) - selector A string containing a selector expression to match elements against. - #### version added: [1\.6](https://api.jquery.com/category/version/1.6/)[.is( function )](https://api.jquery.com/is/#is-function) - function A function used as a test for every element in the set. It accepts two arguments, `index`, which is the element's index in the jQuery collection, and `element`, which is the DOM element. Within the function, `this` refers to the current DOM element. - #### version added: [1\.6](https://api.jquery.com/category/version/1.6/)[.is( selection )](https://api.jquery.com/is/#is-selection) - selection An existing jQuery object to match the current set of elements against. - #### version added: [1\.6](https://api.jquery.com/category/version/1.6/)[.is( elements )](https://api.jquery.com/is/#is-elements) - elements One or more elements to match the current set of elements against. Unlike other filtering methods, `.is()` does not create a new jQuery object. Instead, it allows you to test the contents of a jQuery object without modification. This is often useful inside callbacks, such as event handlers. Suppose you have a list, with two of its items containing a child element: \| \| \| \|---\|---\| \| 1 2 3 4 5 \| \| You can attach a click handler to the \<ul\> element, and then limit the code to be triggered only when a list item itself, not one of its children, is clicked: \| \| \| \|---\|---\| \| 1 2 3 4 5 6 \| \| Now, when the user clicks on the word "list" in the first item or anywhere in the third item, the clicked list item will be given a red background. However, when the user clicks on item 1 in the first item or anywhere in the second item, nothing will occur, because in those cases the target of the event would be `<strong>` or `<span>`, respectively. #### Using a Function The second form of this method evaluates expressions related to elements based on a function rather than a selector. For each element, if the function returns `true`, `.is()` returns `true` as well. For example, given a somewhat more involved HTML snippet: \| \| \| \|---\|---\| \| 1 2 3 4 5 6 7 8 \| \| You can attach a click handler to every `<li>` that evaluates the number of `<strong>` elements within the clicked `<li>` at that time like so: \| \| \| \|---\|---\| \| 1 2 3 4 5 6 7 8 9 10 11 \| \| ## Examples: ### Example 1 Shows a few ways is() can be used inside an event handler. \| \| \| \|---\|---\| \| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 \| \| #### Demo: ### Example 2 Returns true, because the parent of the input is a form element. \| \| \| \|---\|---\| \| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 \| \| #### Demo: ### Example 3 Returns false, because the parent of the input is a p element. \| \| \| \|---\|---\| \| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 \| \| #### Demo: ### Example 4 Checks against an existing collection of alternating list elements. Blue, alternating list elements slide up while others turn red. \| \| \| \|---\|---\| \| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 \| \| #### Demo: ### Example 5 An alternate way to achieve the above example using an element rather than a jQuery object. Checks against an existing collection of alternating list elements. Blue, alternating list elements slide up while others turn red. \| \| \| \|---\|---\| \| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 \| \| #### Demo:
Shard	53 (laksa)
Root Hash	657907979407719853
Unparsed URL	com,jquery!api,/is/ s443