/
getElementsBySelector.js
167 lines (160 loc) · 6.25 KB
/
getElementsBySelector.js
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/* 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 (tagName && element.nodeName.toLowerCase() != tagName) {
// 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
*/