| /* document.getElementsBySelector(selector) |
| - returns an array of element objects from the current document |
| matching the CSS selector. Selectors can contain element names, |
| class names and ids and can be nested. For example: |
| |
| elements = document.getElementsBySelect('div#main p a.external') |
| |
| Will return an array of all 'a' elements with 'external' in their |
| class attribute that are contained inside 'p' elements that are |
| contained inside the 'div' element which has id="main" |
| |
| New in version 0.4: Support for CSS2 and CSS3 attribute selectors: |
| See http://www.w3.org/TR/css3-selectors/#attribute-selectors |
| |
| Version 0.4 - Simon Willison, March 25th 2003 |
| -- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows |
| -- Opera 7 fails |
| */ |
| |
| function getAllChildren(e) { |
| // Returns all children of element. Workaround required for IE5/Windows. Ugh. |
| return e.all ? e.all : e.getElementsByTagName('*'); |
| } |
| |
| document.getElementsBySelector = function(selector) { |
| // Attempt to fail gracefully in lesser browsers |
| if (!document.getElementsByTagName) { |
| return new Array(); |
| } |
| // Split selector in to tokens |
| var tokens = selector.split(' '); |
| var currentContext = new Array(document); |
| for (var i = 0; i < tokens.length; i++) { |
| token = tokens[i].replace(/^\s+/,'').replace(/\s+$/,'');; |
| if (token.indexOf('#') > -1) { |
| // Token is an ID selector |
| var bits = token.split('#'); |
| var tagName = bits[0]; |
| var id = bits[1]; |
| var element = document.getElementById(id); |
| if (!element || (tagName && element.nodeName.toLowerCase() != tagName)) { |
| // ID not found or tag with that ID not found, return false. |
| return new Array(); |
| } |
| // Set currentContext to contain just this element |
| currentContext = new Array(element); |
| continue; // Skip to next token |
| } |
| if (token.indexOf('.') > -1) { |
| // Token contains a class selector |
| var bits = token.split('.'); |
| var tagName = bits[0]; |
| var className = bits[1]; |
| if (!tagName) { |
| tagName = '*'; |
| } |
| // Get elements matching tag, filter them for class selector |
| var found = new Array; |
| var foundCount = 0; |
| for (var h = 0; h < currentContext.length; h++) { |
| var elements; |
| if (tagName == '*') { |
| elements = getAllChildren(currentContext[h]); |
| } else { |
| try { |
| elements = currentContext[h].getElementsByTagName(tagName); |
| } |
| catch(e) { |
| elements = []; |
| } |
| } |
| for (var j = 0; j < elements.length; j++) { |
| found[foundCount++] = elements[j]; |
| } |
| } |
| currentContext = new Array; |
| var currentContextIndex = 0; |
| for (var k = 0; k < found.length; k++) { |
| if (found[k].className && found[k].className.match(new RegExp('\\b'+className+'\\b'))) { |
| currentContext[currentContextIndex++] = found[k]; |
| } |
| } |
| continue; // Skip to next token |
| } |
| // Code to deal with attribute selectors |
| if (token.match(/^(\w*)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/)) { |
| var tagName = RegExp.$1; |
| var attrName = RegExp.$2; |
| var attrOperator = RegExp.$3; |
| var attrValue = RegExp.$4; |
| if (!tagName) { |
| tagName = '*'; |
| } |
| // Grab all of the tagName elements within current context |
| var found = new Array; |
| var foundCount = 0; |
| for (var h = 0; h < currentContext.length; h++) { |
| var elements; |
| if (tagName == '*') { |
| elements = getAllChildren(currentContext[h]); |
| } else { |
| elements = currentContext[h].getElementsByTagName(tagName); |
| } |
| for (var j = 0; j < elements.length; j++) { |
| found[foundCount++] = elements[j]; |
| } |
| } |
| currentContext = new Array; |
| var currentContextIndex = 0; |
| var checkFunction; // This function will be used to filter the elements |
| switch (attrOperator) { |
| case '=': // Equality |
| checkFunction = function(e) { return (e.getAttribute(attrName) == attrValue); }; |
| break; |
| case '~': // Match one of space seperated words |
| checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('\\b'+attrValue+'\\b'))); }; |
| break; |
| case '|': // Match start with value followed by optional hyphen |
| checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('^'+attrValue+'-?'))); }; |
| break; |
| case '^': // Match starts with value |
| checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) == 0); }; |
| break; |
| case '$': // Match ends with value - fails with "Warning" in Opera 7 |
| checkFunction = function(e) { return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length); }; |
| break; |
| case '*': // Match ends with value |
| checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) > -1); }; |
| break; |
| default : |
| // Just test for existence of attribute |
| checkFunction = function(e) { return e.getAttribute(attrName); }; |
| } |
| currentContext = new Array; |
| var currentContextIndex = 0; |
| for (var k = 0; k < found.length; k++) { |
| if (checkFunction(found[k])) { |
| currentContext[currentContextIndex++] = found[k]; |
| } |
| } |
| // alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue); |
| continue; // Skip to next token |
| } |
| // If we get here, token is JUST an element (not a class or ID selector) |
| tagName = token; |
| var found = new Array; |
| var foundCount = 0; |
| for (var h = 0; h < currentContext.length; h++) { |
| var elements = currentContext[h].getElementsByTagName(tagName); |
| for (var j = 0; j < elements.length; j++) { |
| found[foundCount++] = elements[j]; |
| } |
| } |
| currentContext = found; |
| } |
| return currentContext; |
| } |
| |
| /* That revolting regular expression explained |
| /^(\w+)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/ |
| \---/ \---/\-------------/ \-------/ |
| | | | | |
| | | | The value |
| | | ~,|,^,$,* or = |
| | Attribute |
| Tag |
| */ |