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    <p>Here is how I would do the basic validation using <a href="http://jquery.com/" rel="nofollow">jQuery</a>.</p> <pre><code>$(document).ready(function(){ $('#contact').keypress(function(e){ //when user presses a key in that Input Box var code = (e.keyCode ? e.keyCode : e.which); if(code == 13) // check if it is Enter Key { if($(this).val().trim().length == 0) // check if it is empty alert("Error: Shouldn't be empty !"); else { // You are good to go here } } }); });​ </code></pre> <p>HTML:</p> <pre><code>&lt;input id="contact" name="contact" value="" /&gt;​ </code></pre> <p>If you wish to test it live, goto: <a href="http://jsfiddle.net/NFSTL/" rel="nofollow">http://jsfiddle.net/NFSTL/</a></p> <p>I binded the <a href="http://api.jquery.com/keypress/" rel="nofollow">KeyPress</a> event to that InputBox.</p> <p>Hope it helps. :)</p> <hr> <p><strong>EDIT</strong></p> <p>Without using jQuery:</p> <pre><code>function ajaxFunction(e){ var code; if (!e) var e = window.event; if (e.keyCode) code = e.keyCode; else if (e.which) code = e.which; if (e.target) targ = e.target; else if (e.srcElement) targ = e.srcElement; if (targ.nodeType == 3) // defeat Safari bug targ = targ.parentNode; if(code==13) { if(targ.value.trim().length == 0) alert("Error: This shouldn't be empty!"); else { //do the sending and receiving of data here... } } }​ </code></pre> <p>HTML:</p> <pre><code>&lt;input id="agid" type="text" name="contactid" onkeyup="ajaxFunction(event)" /&gt;​ </code></pre> <p>For live testing: <a href="http://jsfiddle.net/SYf4C/" rel="nofollow">http://jsfiddle.net/SYf4C/</a></p> <p>Here's an excellent tutorial I used: <a href="http://www.quirksmode.org/js/events_properties.html" rel="nofollow">quirksmode.org/js/events_properties</a></p> <p>I would say that, jQuery makes life easier. :) Because it is a JavaScript library composed to work in almost all browsers.</p>
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    1. USAkhilesh B Chandran
    1. USAkhilesh B Chandran
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    1. COthanks @Akhilesh for your answer:) but is there any other way rather than using jQuery?
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    2. COI have edited my answer. Check it.
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    3. COExcellent!! thanks a lot @Akhilesh :) but how to show error msg if user input wrong id? [i,e. ID not found in database]
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