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    <p>Never assume you can cancel the submit button, instead set some javascript variable or hidden field on the form and use onsubmit. Take my word for it. Have the onsubmit look at the variable set by the different submit buttons</p> <p>Never use <strong>javascript:</strong> (javascript colon) unless you are in IE and have a VBScript as the first script on the page. In all other cases javascript is default. </p> <p>Never use such atrocities as <code>&lt;a href="javascript:something()"</code> instead of <code>&lt;a href="#" onclick="return something()</code></p> <p>Lastly, in IE, when you have an error occurring, the default action is to submit the form. You may very well have other errors completely elsewhere and have the validate return the error, which is seen as true (0 evaluates to false, <a href="http://11heavens.com/falsy-and-truthy-in-javascript" rel="nofollow">most anything else is true</a>)</p> <pre><code>&lt;script type="text/javascript"&gt; var isvalidateNeeded = true; function validate(theForm) { if (!isvalidateNeeded) return true; // allow submission . // normal validation . . return true; // allow submission } &lt;/script&gt; &lt;form onsubmit="return validate(this)"&gt; . . . &lt;input type="submit" name="subaction" value="Test" onclick="isvalidateNeeded=false" /&gt; &lt;input type="submit" name="subaction" value="Check" onclick="isvalidateNeeded=false" /&gt; &lt;input type="submit" name="subaction" value="Submit" onclick="isvalidateNeeded=true" /&gt; &lt;/form&gt; </code></pre>
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