Worth validating with JS as well as php?

[djeyewater]

If you're validating a form using a server side language, is there any point validating it client side as well?

I know that client side validation is faster, but I wouldn't of thought it would be much faster and also means you have to type some extra code.

[jimz]

Validating with javascript first would save some server resource.

It might save the user some frustration if they have a slow connection. Reloading a page only to see you have entered fields incorrectly can be pretty annoying!

I'd do both if you have time, otherwise, stick with PHP.

[sekuchi]

It is a good practice to include PHP when validating because JS can be disabled in the browser so, your JS validation is useless...

[Aso]

@ Sekuchi, djeyewater was asking if it was necessary validating with Javascript on top of PHP validation.

@djeyewater - I agree with jimz. If you've got the time, it's a helpful feature that'll save a slice of system resource.

If you are going to stick to just PHP, make sure that data is returned to the form fields. People get easily frustrated if they click submit, only to be presented with an error and all their inputs lost!

[sekuchi]

Originally Posted by aso186

@ Sekuchi, djeyewater was asking if it was necessary validating with Javascript on top of PHP validation.

Well, I just made an opinion that using PHP is a good practice for validation. That's all...

[masonbarge]

Yes, this is a very user-friendly feature. It saves the user the need to submit, read the error message, and go back to the form to correct the information, as well as saving server resources.

There are at least two ways to do it. One is an alert or print when the submit button is clicked. Most sites also put a red asterisk or a message like *Required information by whichever input needs to be changed/filled.

Another is to use the onblur event to do the validation and warning as soon as the user leaves a field that is incorrectly filled out. This can be tricky to style.

Unfortunately, you still need to code sticky fields for js-disabled users.

If you need any hints about the javascript, you'd probably be better off asking in that thread. There are plenty of good free scripts.

As I read the original post, djeyewater intends to validate with PHP. He just wants to know if he should add a second javascript validation.

[djeyewater]

Thanks for the replies everyone, I think I will use JS as well as PHP as suggested.