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This is my html:
<input type="text" name="folderName">
Here, I want to validate the textbox value by not allowing to key in special characters and space. But it should allow underscore.
How to validate this textbox?
341
You may try to use this function:
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
<script type="text/javascript">
function blockSpecialChar(e){
var k;
document.all ? k = e.keyCode : k = e.which;
return ((k > 64 && k < 91) || (k > 96 && k < 123) || k == 8 || k == 32 || (k >= 48 && k <= 57));
}
</script>
</head>
<body>
<form id="frm" runat="server">
<input type="text" name="folderName" onkeypress="return blockSpecialChar(event)"/>
</form>
</body>
</html>
Try like this
$(document).ready(function () {
$("#sub").click(function(){
var fn = $("#folderName").val();
var regex = /^[0-9a-zA-Z\_]+$/
alert(regex.test(fn));
});
});
This return false for special chars and spaces and return true for underscore, digits and alphabets.
Fiddle: http://jsfiddle.net/7C5nP/
42
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