How to validate html textbox not to allow special characters and space?
Solution 1
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>
Solution 2
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/
Solution 3
You may try to use this function:
<input class="form-control" onkeypress="return ((event.charCode > 64 && event.charCode < 91) || (event.charCode > 96 && event.charCode < 123) || event.charCode == 8 || event.charCode == 32 || (event.charCode >= 48 && event.charCode <= 57));" id="name" formControlName="name" type="text" autocomplete="off" value="">
It works for me.
Solution 4
You can use jQuery + jQuery Validation Plugin. That will make it that easy:
This will allow the user only to type letters plus underscore
<input type="text" data-validation="alphanumeric" data-validation-allowing="_">
Link to the jQuery Plugin: http://formvalidator.net/index.html
thevan
Software Engineering Senior Analyst at Accenture Solutions Private Limited, Chennai, India. Interested in ASP.Net, MVC, Web API, WCF, Web Services, ADO.Net, C#.Net, VB.Net, Entity Framework, MS SQLServer, Angular.js, JavaScript, JQuery, Ajax, HTML and CSS
Updated on October 28, 2020Comments
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thevan over 3 years
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?