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POCan anyone beat this jQuery selector?
 

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    <p>I've been running some tests to see if I can find an efficient selector for controls prefixed with the id of parent controls in Asp.Net</p> <p>I've been looking for this as I was to be able to select Asp controls from external javascript files (I'm fed up of using ClientID). </p> <p>To test I set up a page with 150 textboxes all with the cssclass "speedy" and an individual id and ran the following code to select the 107th textbox.</p> <pre><code>function testclientInput() { var iterations = 100; var totalTime = 0; // Record the starting time, in UTC milliseconds. var start = new Date().getTime(); // Repeat the test the specified number of iterations. for (i = 0; i &lt; iterations; i++) { // Execute the selector. The result does not need // to be used or assigned to determine how long // the selector itself takes to run. // All tests done in ie6, ie7, ie8, ie9beta, firefox3.6, opera11 &amp; chrome8 // slowest // $('input.speedy[id$=_TextBox107]'); // Quick but only useful if you know the index. //$($('input.speedy')[106]); //$('[id$=_TextBox107]:first'); //$('input[id$=_TextBox107]'); //$.clientID("TextBox107"); //$('[id$=_TextBox107]'); //$('input[id$=_TextBox107]:first'); //$($('[id$=_TextBox107]')[0]); // Fastest //$($('input[id$=_TextBox107]')[0]); } // Record the ending time, in UTC milliseconds. var end = new Date().getTime(); // Determine how many milliseconds elapsed totalTime = (end - start); // Report the average time taken by one iteration. alert(totalTime / iterations); }; </code></pre> <p>This is the best I have come up with. <code>$($('input[id$=_TextBox107]')[0]);</code>. The results have been surprising.... I expected using the <code>:first</code> selector to match my version but it reported much slower results.</p> <p>Can anyone think of a way to optimize this?</p>
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    1. COSorry, but why can't you use `document.getElementById('_TextBox107')`? IDs should be unique anyway
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    2. CO@Harmen: He's using the *attribute ends with* selector, so `_TextBox107` is just the last part of the ID.
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    3. CO@Harmen: Because asp controls are prefixed by their parent id. I do state this in my question.
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