KeyPressEventArgs

[mrathi]

Hi,

I want to restric a user to enter only numbers in a textbox in asp.net. I use validation, however I also use postback, which basically does some arithmetic operation. If the user enters a valid number and hits TAB, my arithmetic works correct. If the user enters invalid number, before the validation is complete I get an error saying that the text cannot be converted to double? How can I rectify this?

Thanks

 

[Veep]

In the page_load event you could add:

this.txtNumber.Attributes.Add("onblur","return checkNumber();");

Then just create a client-side javascript function on the .aspx page. That way it won't postback.

function checkNumber()
{
  if(isNaN(Form1.txtNumber.value))
   {
	alert("Not a number");
	return false;
   }
}

 

[JohnYingling]

See the Page.IsValid Property.

"Public ReadOnly Property IsValid As Boolean

Property Value
true if page validation succeeded; otherwise, false.

Remarks
For this property to return true, all validation server controls in the Page.Validators property must validate successfully. You should check this property only after you have called the Page.Validate method, or set the CausesValidation property to true in the OnServerClick handler for an ASP.NET server control that initiates form processing. These server controls include the Button, HtmlButton, HtmlInputButton, HtmlInputImage, ImageButton, and LinkButton classes."

http://www.VBCompare.com

Compare Code