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How to validate for numbers only in textbox using Javascript

In ASP.NET you can use textboxes that can enter only numbers. For this, first you have to create a javascript file.

For creating a javascript file,
first right click on the Project name in Solution Explorer
select Add New Item -> JScript File-> Ok

If you want, you can give a name to JSCript file. Here I use the name "number.js". After that write the following code in that file.
Expand|Select|Wrap|Line Numbers
  1. function numberonly(e)
  2. {
  3.     var KeyID = (window.event) ? event.keyCode : e.which; 
  4.     if(KeyID>=48 && KeyID<=57)
  5.         return true;
  6.     else
  7.         alert("Please Enter Number Only");
  8.         return false;
  9.  }

Save this file. Take the source part of the webform. Add the following code in <head> of html.
Expand|Select|Wrap|Line Numbers
  1. <head>
  2. <script type="text/javascript" src="number.js">
  3. </script>
  4. </head>

Take the source aspx.cs file. Inside the Page_Load function
write the below code.
Expand|Select|Wrap|Line Numbers
  1. TextBox1.Attributes.Add("onkeypress", "return numberonly(event);");

Where TextBox1 is the name of the TextBox where we want to enter the data.
Oct 14 '10 #1
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