Textbox max length validation using javascript
In this example i have explained how to do textbox max length validation using javascript. here i used to validate regular expression. this textbox will allow max 10 characters only. Using JQuery also we can do text box count validation.<html>
<head>
<title></title>
<script type="text/javascript">
function validate() {
var txtMaxLength = document.getElementById("txtMaxLength").value;
//Max length validation with regular expression
var retxtMaxLength = /^[\s\S]{0,10}$/;
if (!txtMaxLength.match(retxtMaxLength)) {
alert('Max length only 10 characters.');
return false;
}
}
</script>
</head>
<body>
<input type="text" id="txtMaxLength" /><br />
<input type="button" value="Max Length Validation" onclick=" return validate();" />
</body>
</html>
Before doing this we may require text box required field validation.For more form validation you can go see Form Validation.
See more JQuery Interview Questions
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