author | Todd Larsen <tlarsen@google.com> |
Wed, 24 Sep 2008 02:22:12 +0000 | |
changeset 191 | 80f08751f1e5 |
parent 54 | 03e267d67478 |
permissions | -rw-r--r-- |
54
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1 |
/* document.getElementsBySelector(selector) |
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2 |
- returns an array of element objects from the current document |
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3 |
matching the CSS selector. Selectors can contain element names, |
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4 |
class names and ids and can be nested. For example: |
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5 |
|
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6 |
elements = document.getElementsBySelect('div#main p a.external') |
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7 |
|
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8 |
Will return an array of all 'a' elements with 'external' in their |
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9 |
class attribute that are contained inside 'p' elements that are |
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10 |
contained inside the 'div' element which has id="main" |
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11 |
|
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12 |
New in version 0.4: Support for CSS2 and CSS3 attribute selectors: |
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13 |
See http://www.w3.org/TR/css3-selectors/#attribute-selectors |
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14 |
|
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15 |
Version 0.4 - Simon Willison, March 25th 2003 |
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16 |
-- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows |
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17 |
-- Opera 7 fails |
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18 |
*/ |
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19 |
|
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20 |
function getAllChildren(e) { |
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21 |
// Returns all children of element. Workaround required for IE5/Windows. Ugh. |
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22 |
return e.all ? e.all : e.getElementsByTagName('*'); |
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23 |
} |
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24 |
|
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25 |
document.getElementsBySelector = function(selector) { |
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26 |
// Attempt to fail gracefully in lesser browsers |
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27 |
if (!document.getElementsByTagName) { |
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28 |
return new Array(); |
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29 |
} |
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30 |
// Split selector in to tokens |
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31 |
var tokens = selector.split(' '); |
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32 |
var currentContext = new Array(document); |
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33 |
for (var i = 0; i < tokens.length; i++) { |
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34 |
token = tokens[i].replace(/^\s+/,'').replace(/\s+$/,'');; |
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35 |
if (token.indexOf('#') > -1) { |
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// Token is an ID selector |
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37 |
var bits = token.split('#'); |
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38 |
var tagName = bits[0]; |
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39 |
var id = bits[1]; |
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40 |
var element = document.getElementById(id); |
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41 |
if (tagName && element.nodeName.toLowerCase() != tagName) { |
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42 |
// tag with that ID not found, return false |
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43 |
return new Array(); |
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44 |
} |
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45 |
// Set currentContext to contain just this element |
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46 |
currentContext = new Array(element); |
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47 |
continue; // Skip to next token |
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48 |
} |
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49 |
if (token.indexOf('.') > -1) { |
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50 |
// Token contains a class selector |
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51 |
var bits = token.split('.'); |
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52 |
var tagName = bits[0]; |
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53 |
var className = bits[1]; |
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if (!tagName) { |
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tagName = '*'; |
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56 |
} |
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// Get elements matching tag, filter them for class selector |
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58 |
var found = new Array; |
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59 |
var foundCount = 0; |
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for (var h = 0; h < currentContext.length; h++) { |
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var elements; |
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if (tagName == '*') { |
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elements = getAllChildren(currentContext[h]); |
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64 |
} else { |
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try { |
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elements = currentContext[h].getElementsByTagName(tagName); |
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67 |
} |
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catch(e) { |
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elements = []; |
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} |
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71 |
} |
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for (var j = 0; j < elements.length; j++) { |
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73 |
found[foundCount++] = elements[j]; |
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74 |
} |
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75 |
} |
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currentContext = new Array; |
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var currentContextIndex = 0; |
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for (var k = 0; k < found.length; k++) { |
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if (found[k].className && found[k].className.match(new RegExp('\\b'+className+'\\b'))) { |
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currentContext[currentContextIndex++] = found[k]; |
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81 |
} |
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82 |
} |
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83 |
continue; // Skip to next token |
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84 |
} |
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// Code to deal with attribute selectors |
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86 |
if (token.match(/^(\w*)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/)) { |
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87 |
var tagName = RegExp.$1; |
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88 |
var attrName = RegExp.$2; |
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89 |
var attrOperator = RegExp.$3; |
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90 |
var attrValue = RegExp.$4; |
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91 |
if (!tagName) { |
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92 |
tagName = '*'; |
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93 |
} |
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// Grab all of the tagName elements within current context |
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95 |
var found = new Array; |
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96 |
var foundCount = 0; |
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97 |
for (var h = 0; h < currentContext.length; h++) { |
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98 |
var elements; |
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99 |
if (tagName == '*') { |
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100 |
elements = getAllChildren(currentContext[h]); |
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101 |
} else { |
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102 |
elements = currentContext[h].getElementsByTagName(tagName); |
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103 |
} |
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104 |
for (var j = 0; j < elements.length; j++) { |
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105 |
found[foundCount++] = elements[j]; |
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106 |
} |
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107 |
} |
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108 |
currentContext = new Array; |
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109 |
var currentContextIndex = 0; |
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110 |
var checkFunction; // This function will be used to filter the elements |
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111 |
switch (attrOperator) { |
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112 |
case '=': // Equality |
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113 |
checkFunction = function(e) { return (e.getAttribute(attrName) == attrValue); }; |
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114 |
break; |
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115 |
case '~': // Match one of space seperated words |
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116 |
checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('\\b'+attrValue+'\\b'))); }; |
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117 |
break; |
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118 |
case '|': // Match start with value followed by optional hyphen |
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119 |
checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('^'+attrValue+'-?'))); }; |
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120 |
break; |
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121 |
case '^': // Match starts with value |
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122 |
checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) == 0); }; |
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123 |
break; |
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124 |
case '$': // Match ends with value - fails with "Warning" in Opera 7 |
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125 |
checkFunction = function(e) { return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length); }; |
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126 |
break; |
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127 |
case '*': // Match ends with value |
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128 |
checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) > -1); }; |
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129 |
break; |
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130 |
default : |
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131 |
// Just test for existence of attribute |
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132 |
checkFunction = function(e) { return e.getAttribute(attrName); }; |
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133 |
} |
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134 |
currentContext = new Array; |
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135 |
var currentContextIndex = 0; |
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136 |
for (var k = 0; k < found.length; k++) { |
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137 |
if (checkFunction(found[k])) { |
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138 |
currentContext[currentContextIndex++] = found[k]; |
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139 |
} |
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140 |
} |
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141 |
// alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue); |
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142 |
continue; // Skip to next token |
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143 |
} |
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144 |
// If we get here, token is JUST an element (not a class or ID selector) |
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145 |
tagName = token; |
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146 |
var found = new Array; |
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147 |
var foundCount = 0; |
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148 |
for (var h = 0; h < currentContext.length; h++) { |
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149 |
var elements = currentContext[h].getElementsByTagName(tagName); |
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150 |
for (var j = 0; j < elements.length; j++) { |
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151 |
found[foundCount++] = elements[j]; |
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|
152 |
} |
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|
153 |
} |
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|
154 |
currentContext = found; |
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|
155 |
} |
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|
156 |
return currentContext; |
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|
157 |
} |
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|
158 |
|
03e267d67478
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159 |
/* That revolting regular expression explained |
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160 |
/^(\w+)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/ |
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161 |
\---/ \---/\-------------/ \-------/ |
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162 |
| | | | |
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163 |
| | | The value |
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164 |
| | ~,|,^,$,* or = |
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|
165 |
| Attribute |
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|
166 |
Tag |
03e267d67478
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167 |
*/ |