Character, Numeric, Character count validation for textbox using javascript in ASP.NET
In this client side validation, we are doing username validation for the text box. Here I am checking characters, numerics and total characters count between 5 to 10 (/^[a-z,A-Z,0-9]{5,10}$/;).If you want any other regular expressions please write in comments i will help you.
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type="text/javascript">
function ValidateForm() {
var txtName = document.getElementById("txtName").value;
var regularExpression = /^[a-z,A-Z,0-9]{5,10}$/;
if (!txtName.match(regularExpression)) {
alert("Name should be alpha numeric and characters count with in 5 to 10");
}
}
</script>
</head>
<body>
User Name: <input type="text" id="txtName" /><br />
<br />
<input type='button' value="validate" onclick="ValidateForm();" />
</body>
</html>
Before doing this operation you may need required field validation for textbox using javascript.
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