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POIs there any way to optimise this code?
 

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    <p>I have a piece of code which will invert all the checkboxes on my form. I have multiple elements (not just checkboxes but also <code>&lt;input type='text'&gt;</code>'s) in it. The reason I need it to be optimised is because it takes about two to three seconds to select all the checkboxes (275 right now).</p> <p>Here's my code:</p> <pre><code>function FormInverse() { var iCheckbox = 1; // Because there are multiple input elements, we need to distinquish the input element ID and the row id var FormLength = document.FormFacturen.elements.length; for (i=0; i &lt; FormLength; i++) { var FormElementType = document.FormFacturen.elements[i].type; if (FormElementType == "checkbox") { var Elements = document.getElementsByClassName('row' + iCheckbox); // Alle elementen in de array zetten var iNumElements = Elements.length; for (iElement=0; iElement &lt; iNumElements; iElement++) { if (document.FormFacturen[i].checked == true) { Elements[iElement].className = "invoice-tr-standard row" + iCheckbox; } else { Elements[iElement].className = "invoice-tr-clicked row" + iCheckbox; } } iCheckbox++; document.FormFacturen[i].checked = !document.FormFacturen[i].checked; } } } </code></pre> <p>And here is the <code>document.getElementsByClassName</code> function:</p> <pre><code>document.getElementsByClassName = function(cl) { var retnode = []; var myclass = new RegExp('\\b'+cl+'\\b'); var elem = document.getElementsByTagName('*'); for (var i = 0; i &lt; elem.length; i++) { var classes = elem[i].className; if (myclass.test(classes)) retnode.push(elem[i]); } return retnode; }; </code></pre>
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    1. COAny reason why you wouldn't leverage something like jQuery? This type of scripting is so much simpler in jQuery.
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    2. CO@Josh because I have never really worked with jQuery so I'm not experienced with it. If it end-result is that it's going to be faster, then it's ok.
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    3. COI'd definitely check to see if the browser already implements `document.getElementsByClassName()` or the Selectors API and use these if they exist and fall back to your function if they don't. They are likely to be considerably faster.
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      1. USRuss Cam
 

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