I need to through an error message, if the user left the field blank and clicks on another field.

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Hi,

In my application I have a name field (txtname), username field(txtusername),etc. I have inserted a required field validations for both, the required field validator is working fine when we click on the button(submit). But here my requirement is, if the user not enter the previous field (means he left blank of txtname and entering the data for next field say txtusername), at that time it has to immediately through an error message (like "You can't leave this empty."). Like in gmail create account this idea is used. Like wise i want do the same. Please help me out regarding this.

Sorry for any errors or not understanding.

Posted 9-Jul-12 20:49pm

vinay7.ra

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_Amy · Answer 1 · 2012-07-09T20:55:00

Hi,
You need to use JavaScript validation to show the alert box. Follow the links below to perform validation using JavaScript:
http://www.w3schools.com/js/js_form_validation.asp[^]
http://www.javascript-coder.com/html-form/javascript-form-validation.phtml[^]
http://www.tizag.com/javascriptT/javascriptform.php[^]

All the best.
--Amit

Santhosh Kumar Jayaraman · Answer 2 · 2012-07-09T21:11:00

Solution 2

You have to set causesvalidation=true for the controls. So that when you move focus from one control to other, it will validate previous controls.

Posted 9-Jul-12 21:11pm

Santhosh Kumar Jayaraman