Javascript – Hàm getElementsByClassName

<script type="text/javascript">

// Created by: Stuart Colville | http://muffinresearch.co.uk/

function getElementsByClassName(strClass, strTag, objContElm) {

strTag = strTag || "*";

objContElm = objContElm || document;

var objColl = objContElm.getElementsByTagName(strTag);

if (!objColl.length && strTag == "*" && objContElm.all) objColl = objContElm.all;

var arr = new Array();

var delim = strClass.indexOf(‘|’) != -1 ? ‘|’ : ‘ ‘;

var arrClass = strClass.split(delim);

for (var i = 0, j = objColl.length; i < j; i++) {

var arrObjClass = objColl[i].className.split(‘ ‘);

if (delim == ‘ ‘ && arrClass.length > arrObjClass.length) continue;

var c = 0;

comparisonLoop:

for (var k = 0, l = arrObjClass.length; k < l; k++) {

for (var m = 0, n = arrClass.length; m < n; m++) {

if (arrClass

== arrObjClass[k]) c++;

if (( delim == ‘|’ && c == 1) || (delim == ‘ ‘ && c == arrClass.length)) {

arr.push(objColl[i]);

break comparisonLoop;

}

}

}

}

return arr;

}

// To cover IE 5.0’s lack of the push method

Array.prototype.push = function(value) {

this[this.length] = value;

}

</script>

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