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copied!<p>In answer to your questions...</p> <ol> <li>The keydown or keypress events can be intercepted before text is input using javascript</li> <li>You can return false after binding a function to the keydown or keypress event. This will prevent the text from being input.</li> </ol> <p><strong>Example using jQuery:</strong></p> <pre><code>$("#inputfield").live("keydown", function(){ return false; }); </code></pre> <p>If you want to test some input for value on form submit you can do that using jQuery <a href="http://docs.jquery.com/Events/submit" rel="nofollow noreferrer">submit()</a>.</p> <pre><code>$("#theform").submit(function() { var formval = $("#theinput").val(); if(formval == "") { //or some better test alert("input value"); //or some other alert... return false; } else { return true; } }); </code></pre> <p>Returning false will invalidate the click to submit the form.</p> <p><strong>Edit:</strong> If as you say in your comments you want to disable the submission of the form until requirements are met for the input field(s)</p> <pre><code>$("#inputfield").live("keyup", function(){ if($("#inputfield").val() == "") { $('#button').attr("disabled", true); } else { $('#button').attr("disabled", false); } }); </code></pre> <p>You want to use the "<a href="http://docs.jquery.com/Events/keyup" rel="nofollow noreferrer">keyup</a>" event handler to allow the text to be sent first. see my example: <a href="http://jsbin.com/epavo/" rel="nofollow noreferrer">on jsbin</a> </p>

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