For more complex and safe solution see https://github.com/termi/DelegateListener
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event delegation
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| function( | |
| a, //CSS selector | |
| b //callback function | |
| ) { | |
| return function( | |
| e, // event | |
| c, // (placeholder) | |
| d // (placeholder) | |
| ) { | |
| for( d = e.target ; | |
| d && | |
| c !== !1 && // if callback return false, stop bubbling | |
| d != this // stop element | |
| ; d = d.parentElement) // for FF < 9 use 'parentNode' | |
| d.matchesSelector(a) && //Match current node | alternative: match(d, a) | |
| (c = b.call(d, e)); // executes callback | "this" is maches node | |
| return c // return result from last callback execution | |
| } | |
| } |
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| function(e,f){return function(c,b,a){for(a=c.target;a&&!1!==b&&a!=this;a=a.parentElement)a.matchesSelector(e)&&(b=f.call(a,c));return b}} |
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| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| Version 2, December 2004 | |
| Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE> | |
| 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": "event delegation", | |
| "description": "delegation event listener like jQuery.delegate", | |
| "keywords": [ | |
| "event", | |
| "delegation", | |
| "unsafe", | |
| "matchesSelector" | |
| ] | |
| } |
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| <html> | |
| <style> | |
| div { | |
| height: 40px; | |
| margin: 40px 0; | |
| background-color: red; | |
| } | |
| div.A { | |
| background-color: green; | |
| } | |
| </style> | |
| <c id=test> | |
| <div class=A>s</div> | |
| <br> | |
| <div class=B>s</div> | |
| <br> | |
| <div class="A C">s</div> | |
| </c> | |
| <script> | |
| //https://gist.github.com/2369850 | |
| if(!Element.prototype.matchesSelector) { | |
| Element.prototype.matchesSelector = | |
| Element.prototype.webkitMatchesSelector || | |
| Element.prototype.mozMatchesSelector || | |
| Element.prototype.msMatchesSelector || | |
| Element.prototype.oMatchesSelector || function(selector) { | |
| if(!selector)return false; | |
| if(selector === "*")return true; | |
| var thisObj = this, | |
| parent, | |
| i, | |
| str, | |
| tmp, | |
| match = false; | |
| if(/^[\w#\.][\w-]*$/.test(selector) || /^(\.[\w-]*)+$/.test(selector)) { | |
| switch (selector.charAt(0)) { | |
| case '#': | |
| return thisObj.id === selector.slice(1); | |
| break; | |
| case '.': | |
| match = true; | |
| i = -1; | |
| tmp = selector.slice(1).split("."); | |
| str = " " + thisObj.className + " "; | |
| while(tmp[++i] && match) { | |
| match = !!~str.indexOf(" " + tmp[i] + " "); | |
| } | |
| return match; | |
| break; | |
| default: | |
| return thisObj.tagName && thisObj.tagName.toUpperCase() === selector.toUpperCase(); | |
| } | |
| } | |
| parent = thisObj.parentNode; | |
| if(parent && parent.querySelector) { | |
| match = parent.querySelector(selector) === thisObj; | |
| } | |
| if(!match && (parent = thisObj.ownerDocument)) { | |
| tmp = parent.querySelectorAll(selector); | |
| for (i in tmp ) if(_hasOwnProperty(tmp, i)) { | |
| match = tmp[i] === thisObj; | |
| if(match)return true; | |
| } | |
| } | |
| return match; | |
| } | |
| } | |
| function delegate(e,f){return function(c,b,a){for(a=c.target;a&&!1!==b&&a!=this;a=a.parentElement)a.matchesSelector(e)&&(b=f.call(a,c));return b}} | |
| test.addEventListener("click", delegate(".A", function(e){console.log(this)})) | |
| </script> |
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Isn't it possible to save a few bytes by replacing
while(c!==!1&&d!=this&&(d=d.parentNode));withfor(;c!==!1&&d!=this;)d=d.parentNode;? Oh, wait, it's not. This is a do-while loop. Don't see this very often. Good work.