Given a CSS selector, returns true or false depending on wether the selector is defined in any included or embedded stylesheet.
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Checks to see if a given CSS selector is defined in any included stylesheet
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| function( | |
| a, // The CSS selector to search for | |
| b,c,d,e // Placeholders | |
| ){ | |
| for(c in b=document.styleSheets) // Iterate over every stylesheet | |
| for(d in e=b[c].rules||b[c].cssRules) // then iterate over every rule | |
| if(e[d].selectorText==a) // to see if it matches the input | |
| return!0; // If so, return true! | |
| return!b // No match :/ | |
| } |
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| function(a,b,c,d,e){for(c in b=document.styleSheets)for(d in e=b[c].rules||b[c].cssRules)if(e[d].selectorText==a)return!0;return!b} |
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| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| Version 2, December 2004 | |
| Copyright (C) 2013 Johan Hillerström <https://github.com/hillerstorm> | |
| Everyone is permitted to copy and distribute verbatim or modified | |
| copies of this license document, and changing it is allowed as long | |
| as the name is changed. | |
| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION | |
| 0. You just DO WHAT THE FUCK YOU WANT TO. |
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| { | |
| "name": "cssSelectorDefinedOrNot", | |
| "description": "Checks to see if a given CSS selector is defined in any included stylesheet.", | |
| "keywords": [ | |
| "css", | |
| "selector" | |
| ] | |
| } |
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| <!DOCTYPE html> | |
| <title>CSS-selector defined or not?</title> | |
| <style> | |
| .this-exists{ | |
| } | |
| </style> | |
| <div>Expected value: <b>true</b></div> | |
| <div>Actual value: <b id="ret"></b></div> | |
| <script> | |
| var exists = function(a,b,c,d,e){for(c in b=document.styleSheets)for(d in e=b[c].rules||b[c].cssRules)if(e[d].selectorText==a)return!0;return!b} | |
| document.getElementById( "ret" ).innerHTML = exists('.this-exists') | |
| </script> |
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Even for..in loops can be used for definitions (save 5 chars):