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    <p>In gecko (e.g. firefox) the browser prevents that the value becomes longer if you use the <code>maxlength</code> attribute, so the <code>tooLong</code> validation variable will ever be <code>false</code> (see <a href="https://developer.mozilla.org/en/DOM/ValidityState" rel="nofollow">here</a>). There is no chance to hook there.<br> But you can use the <code>pattern</code>-attribute instead:</p> <pre><code>&lt;input ... pattern="^.{0,max}$" /&gt; </code></pre> <p>Replace <code>max</code> in the <code>pattern</code> regex with the number of maximum allowed characters.<br> Now you can bind the <code>input</code>-event and check the boolean <code>element.validity.patternMismatch</code> if the value is to long.</p> <p>Here are links to two examples I've created for you; they are tested with the current versions of firefox and chrome, I can't test with IE9:</p> <ul> <li><a href="http://jsfiddle.net/S4Sq4/" rel="nofollow">first example</a>: if the value is to long, it will be cut and for one second an error message will be shown; a small disadvantage is that you can see the input in a fraction of a second.</li> <li>in the <a href="http://jsfiddle.net/cPXCc/" rel="nofollow">second example</a> the value will never be changed, an error message will be shown until the number of characters is correct and you can only submit the form if all fields are valid.</li> </ul> <p>=== UPDATE ===</p> <p>For IE7 and IE8 support I have updated the examples:</p> <ul> <li><a href="http://jsfiddle.net/S4Sq4/3/" rel="nofollow">example1</a></li> <li><a href="http://jsfiddle.net/cPXCc/11/" rel="nofollow">example2</a></li> </ul>
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    1. POWhile limiting input length of text box by maxlength property, how to explicitly handle the event that the max length has been exceeded?
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    1. POWhile limiting input length of text box by maxlength property, how to explicitly handle the event that the max length has been exceeded?
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    1. COFrom a usability standpoint, I think the second example is much better. People can be easily confused, and having the input value *not* change when they type something (via maxlength in this case) can be annoying and makes it harder to correct the mistake.
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      1. USWesley Murch
    2. COThanks a lot..but I need to test this on IE7,8 also.... plus, with browsers that don't support the 'pattern' attribute on input elements or any HTML5 introductions. Sry, I didn't mention it before... Am editing the question now
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    3. COI've updated my answer.
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