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1302860
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2009-08-19T22:00:45.317
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2009-08-19T22:08:25.190
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2009-08-19T22:08:25.190
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2
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text
Body
<p>Your example demonstrates when you have a reference to the element you want to control. If you already have a reference to the element, there is no reason to use <code>document.getElementById</code> to obtain a reference to it (you already have one):</p> <pre><code><span id="mySpan" onclick="test(this);">TEST</span> <script type="text/javascript"> function test(el) { // el is a reference to an element, you can use it directly el.style.display = 'none'; // to demonstrate that the element you retrieve from gEBI // with el.id is the same as your original reference var elAgain = document.getElementById(el.id); alert(elAgain === el); // "true" } </script> </code></pre> <p>The place where you might want to use <code>document.getElementById</code> is when you want to control another element to which you don't already have a reference:</p> <pre><code><span id="mySpan" onclick="test(this, 'myDiv');">TEST</span> <div id="myDiv" style="display:none;">DIV REVEALED</div> <script type="text/javascript"> function test(el, otherElId) { // el is a reference to an element, you can use it directly el.style.display = 'none'; // otherElId is a string containing the id of // the element you want to control var theDiv = document.getElementById(otherElId); theDiv.style.display = ''; } </script> </code></pre> <p>Note that there is rarely (if ever) a reason to do something like the following:</p> <pre><code><span id="mySpan" onclick="test('mySpan');">TEST</span> <script type="text/javascript"> function test(theElId) { var el = document.getElementById(theElId); el.style.display = 'none'; } </script> </code></pre> <p>If the function is being fired from an element event, you can just pass <code>this</code> (as per my first example), rather than passing the id of the element the event is happening on.</p>
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1. POWhen should I use getElementById?
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1. USGrant Wagner
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1. USGrant Wagner
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1. POWhen should I use getElementById?
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1. COThank you very much, not only for the answer but for educating me for the more-to-come.
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