Error handling in PHP

[zoya23]

Hi,
I need a help here! I have created a login page with username and password as being a compulsory field that user have to fill in in order to gain access to another information page.

What I want to do is to check if the username and the password field has been filled with data. If no data is entered into the username or the password field, I want to show a pop up window to user saying that "username or password field need to be filled in".

However, I do not know how to show this pop up window in PHP (I only know how to use echo). Could someone please help me out or is there resources that I could look up.

Thanks a lot.

[zonewatcher]

Sounds like you are wanting to do the validation before the form is actually submitted. For that you need to use javascript, not php. You could write some js code to validate your fields using the onsubmit event. This will validate for things like length, spacing, etc but not from the db .. everything before hitting the table so to speak. Search some js forums for examples on how to do this.

[zoya23]

Yes, zone watcher. That is actually what I want. Validating the form before they are submitted.

Do you know under which area of javascript that I should search for?

Thanks

[zonewatcher]

Just search some of the js sites for validation. Should provide some ideas.