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POjavascript (jquery) numeric input: keyCode for '3' and '#' are the same
 

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  1. POjavascript (jquery) numeric input: keyCode for '3' and '#' are the same
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    <p>I need to set up an <code>&lt;input type="text" /&gt;</code> so that it will accept only numeric chars, backspace, delete, enter, tabs and arrows.</p> <p>There's a lot of exemple around there, i started with something similar to this:</p> <pre><code>function isNumericKeyCode (keyCode){ return ( (keyCode &gt;= 48 &amp;&amp; keyCode &lt;= 57) //standard keyboard ||(keyCode &gt;= 96 &amp;&amp; keyCode &lt;= 105)) //Numpad } $('#myTextBox').keydown(function(e){ var handled = true; var keyCode = e.keyCode; switch(keyCode){ //Enter and arrows case 13: case 37: case 38: case 39: case 40: doSomethingSpecialsWithThesesKeys(); break; default: handled = false; break; } if ( !handled &amp;&amp; keyCode !== 8 //backspace &amp;&amp; keyCode !== 9 //tab &amp;&amp; keyCode !== 46 //del &amp;&amp; !isNumericKeyCode(keyCode)){ handled = true; } return handled; }); </code></pre> <p>All that worked perfectly until I hit the "#" key. In my french canadian keyboard, the "#" has his own key (no shift implied) that returns keyCode 51, the same as the number "3".</p> <p>I think that in US keyboard, the "#" is obtained by pressing shift+3, that may be why they have the same keycode.</p> <p>Now I realize that I have to handle the shift and alt keys too, but that's another story.</p> <p>It works differently with the jquery keypress event, which offer the charCode property, but I did not used it at first because of what the <a href="http://api.jquery.com/keypress/" rel="nofollow">documentation</a> says :</p> <blockquote> <p>as the keypress event isn't covered by any official specification, the actual behavior encountered when using it may differ across browsers, browser versions, and platforms.</p> </blockquote> <p>Also, I would need a workaround in that case to handle tabs, arrows and other special keys since they don't provide a charCode.</p> <p>So the question is : <strong>is there a way to allow only some specifics chars using the keydown event? And that, in a way that will work independently of the keyboard layout?</strong></p> <p>As a side quest : Which browsers may be problematics with the keypress event? I mean, currently I don't really care if my website does not support IE6. I am targetting recent browsers.</p> <h2>Edit</h2> <hr> <p>As someone pointed out in the comments, this method does not allow user to "ctrl+v" a number in the input. In my particular case this is really not a requirement to be able to paste a number. But this popped something in my head, the user still can right-clic > copy some text in the input, and in that case that could be anything. The more I think of it, the more it seems to me that I will need the <code>keydown</code> event to handle tabs and arrows, and <em>another</em> event to handle the input itself.</p> <h2>Edit2</h2> <hr> <p>A lot of beautiful answers here, but the award goes to <a href="http://mrtsherman" rel="nofollow">mrtsherman</a> for the use of <code>input</code> and <code>propertychange</code> events. I will use a combination of this answer for the numeric validation, plus the <code>keyCode</code> event as before for the special use of arrows, tabs and enter keys.</p>
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    1. COYou know that you can check for NaN(data) and save all those troubles, right?
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    2. COAlso, what happens when the poor user tries to paste a number with CTRL+V?
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    3. CO@gdoron : I suppose you mean checking the value of the textbox in the keyup event? I remembered doing something similar a couple of years ago, resulting in flashing text in the input when non numeric char where entered. I really want to _block_ other chars to be entered.
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