diff options
Diffstat (limited to 'app/lib/grappelli/media/js/getElementsBySelector.js')
| -rw-r--r-- | app/lib/grappelli/media/js/getElementsBySelector.js | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/app/lib/grappelli/media/js/getElementsBySelector.js b/app/lib/grappelli/media/js/getElementsBySelector.js new file mode 100644 index 0000000..15b57a1 --- /dev/null +++ b/app/lib/grappelli/media/js/getElementsBySelector.js @@ -0,0 +1,167 @@ +/* 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 +*/ |