validation onclick event

I think the question is repetitious.

You can do that through the validation controls. Use RegularExpressionValidator control for phone number validation.

\(\d{3}\) ?)|(\d{3}-))?\d{3}-\d{4}( x\d{0,})?

is a reg ex for validating U.S phone numbers you can modify as you require

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With regards
Nishithraj Narayanan

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Good Day Sravan

Someone ask the same question today, infact i thought it was you. But its Simple if you want to validate your controls when you click the Button, its simple you can add something like

    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)

    {

        if(txtname.text != " " && txtPhone.text !="" && txtaddress.text !="")

       {

                  //Do this 

       }

       else

       {

             response.write("<script> alert('Please Enter all Details Before you continue');</script>");

       }



    }

but this is on the server side. I suggest you do this on the client site without writting a single line of code. You can use Validator controls. i have Just Written an Article now dedicated to your problem. a lot of people are asking this question daily , i think its time we point you to the article that has answers for you.

http://www.dotnetfunda.com/articles/article785-how-to-use-validation-controls-in-aspnet-.aspx

The article will be available in few minutes i just need to approve it.


Thank you for posting at dotnetfunda

Vuyiswa Maseko

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[Administrator]

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It is better to use Validators to make your life easier.
But if you dont like to use them, you might go by manually creating some javascript validations that might invoke before you submit the page.

Say you create a button which might call a javascript validation just before your page submits.

<script type="text/javascript" >

function validation()

{

   var elem = document.getElementById('<%= this.txtBox.ClientID%>');

   if(elem.value.length > 0)

        return false;

// Put all valdations here

return true;

}



</script>

Now from the button click:

<asp:Button runat="server" OnClientClick="javascript:return validation();" OnClick="submit_page" />

So before the page is posted back, the validation block fires and if the function returns true, the page is posted back, otherwise it errors out.

Hope you are clear.

www.abhisheksur.com

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You can get the Regular Expression class by:
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.regularexpressionvalidator.aspx

And Different Regular Expressions:
http://www.regexlib.com

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We can validate textbox by onkeypress event of the control By checking whether the keycode of the key pressed as the user types falls within the range of the number keys 48-57(i.e 0-9 and '.') ,if not belong to that range it will return false then it will disable the keypress action
function NumericValidation(eventObj)
{
var keycode;

if(eventObj.keyCode) //For IE
keycode = eventObj.keyCode;
else if(eventObj.Which)
keycode = eventObj.Which; // For FireFox
else
keycode = eventObj.charCode; // Other Browser

if (keycode!=8) //if the key is the backspace key
{
if (keycode<48||keycode>57) //if not a number
return false; // disable key press
else
return true; // enable key press
}
}
http://www.mindfiresolutions.com/Numeric-validation-using-Javascript-612.php

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