/ Published in: JavaScript
Javascript : Validate As You Type
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//Javascript// function validateAsYouType(inputElementId) { var val=inputElementId.value; var lastLetter=val.substring((val.length-1),val.length); if(isNaN(lastLetter)) { //Input is OK. Let things be as they are. } else { //Input is not OK. Rmove the last entered character var new_val=val.substr(0,val.length-1); document.getElementById('inputtype').value=new_val; } } //Javascript// Sample usage: <input type="text" value="" id="inputtype" onkeyup="return validateAsYouType(this);" />