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The e-commerce.

Form Validation Code


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I'm trying to make a custom page that has several textboxes on it. I would like to learn how to validate these boxes when a user clicks the submit button. This is what I have in mind:


A form with 5 textboxes on it (first name, last name, email, and a textbox for the model number of a poduct along with a quantity box next to it). When the user fills out this information I need some code to validate that not only there is information in the name and email boxes but that the model number of the product they entered is a valid number. If all is well then the form gets processed. If all is not well I would like some sort of indicator to show up next to the invalid textboxes without the form refreshing itself and clearing the information. I would like the textboxes to stay populated so the user can see where/why it didn't go through.



If someone could show me how to go about something like this it would be greatly appreciated. I apologize in advance if I have missed a similar post on the forums... perhaps a push in the right direction?



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