/**
* A cross-browser implementation of getElementsByClass.
* Heavily based on Dustin Diaz's function: http://dustindiaz.com/getelementsbyclass.
*
* Find all elements with class `className` inside `container`.
* Use `single = true` to increase performance in older browsers
* when only one element is needed.
*
* @param {String} className
* @param {Element} container
* @param {Boolean} single
* @api public
*/
var getElementsByClassName = function(container, className, single) {
if (single) {
return container.getElementsByClassName(className)[0];
} else {
return container.getElementsByClassName(className);
}
};
var querySelector = function(container, className, single) {
className = '.' + className;
Iif (single) {
return container.querySelector(className);
} else {
return container.querySelectorAll(className);
}
};
var polyfill = function(container, className, single) {
var classElements = [],
tag = '*';
var els = container.getElementsByTagName(tag);
var elsLen = els.length;
var pattern = new RegExp("(^|\\s)"+className+"(\\s|$)");
for (var i = 0, j = 0; i < elsLen; i++) {
Eif ( pattern.test(els[i].className) ) {
Iif (single) {
return els[i];
} else {
classElements[j] = els[i];
j++;
}
}
}
return classElements;
};
module.exports = (function() {
return function(container, className, single, options) {
options = options || {};
if ((options.test && options.getElementsByClassName) || (!options.test && document.getElementsByClassName)) {
return getElementsByClassName(container, className, single);
} else if ((options.test && options.querySelector) || (!options.test && document.querySelector)) {
return querySelector(container, className, single);
} else {
return polyfill(container, className, single);
}
}
})();
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