(public).sospep.subjects ~ view article ~ how-to-test-if-an-object-exists-on-a-page

<h1 style="text-align: center;">test if an object exists on a page</h1>
<h2>[WHAT]</h2>
<ol>
<li>] Came across this during the setStatus debacle, after I finally got the issue of setting the status select element resolved I was still getting a js error on all pages not containing the selStatus as I was calling the setStatus method in the jq document onready function on all pages but not all pages have the status element</li>
</ol>
<h2>[WHY]</h2>
<ol>
<li>]&nbsp;had code in global js file, was getting js error b/c the object the code was executing on was not present on all pages</li>
</ol>
<h2>[WHERE]</h2>
<ol>
<li>]&nbsp;</li>
</ol>
<h2>[WHEN]</h2>
<ol>
<li>]&nbsp;an element may or may not be present on a page</li>
</ol>
<h2>[EXAMPLE]</h2>
<ol>
<li>] &nbsp;</li>
</ol>
<h2>[HOW-TO]</h2>
<ol>
<li>] if (document.getElementById('product'))</li>
<ol>
<li>{ // code here when the element exists } or, untested but for efficiency,</li>
</ol>
<li>] if ( T = document.getElementById('product') )</li>
<ol>
<li>{ // code herein when the element exists, using T } or</li>
</ol>
<li>] if ( !(T = document.getElementById('product') ) )</li>
<ol>
<li>{ AbandonShip() } // code hereon when the element exists, using T</li>
</ol></ol>
<h2>[REFERENCE]</h2>
<ol>
<li>] <a href="http://bytes.com/topic/javascript/answers/479963-check-if-object-exists">http://bytes.com/topic/javascript/answers/479963-check-if-object-exists</a></li>
</ol>

~ view article ~ Chapter] ch-024-how-to FROM [ Book] language-javascript IN [ libraries] technology-developer-www