Client side vs. Server side JavaScript

[byuedwin]

Hello,

I am starting a new website, and I would like to decide ahead of time
what functions (in JavaScript) I will need to write on the server side
and which ones on the client side. I believe that some validations are
important on the client side, and I am thinking of writing some php
validations for the server side. What types of functions are usually
written on the server side?
What types are usually written on the client side?

I am making my pages in php.

1. In this site users will be able to log in.
2. I will have a register page.
3. My accounts page.
4. And a page that they can post listings in.
5. An admin page that will keep track of billing accounts.

I hope this gives some good explanation. If not let me know, and I can
describe more.
Thank you for your help!
byuedwin

 

[Ant]

Hello,

I am starting a new website, and I would like to decide ahead of time
what functions (in JavaScript) I will need to write on the server side
and which ones on the client side. I believe that some validations are
important on the client side, and I am thinking of writing some php
validations for the server side. What types of functions are usually
written on the server side?
What types are usually written on the client side?

I am making my pages in php.

1. In this site users will be able to log in.
2. I will have a register page.
3. My accounts page.
4. And a page that they can post listings in.
5. An admin page that will keep track of billing accounts.

Validation of data the user enters in registration forms etc should be
checked client side as they can then correct those mistakes straight away
rather than sending off the incorrect info and then being asked to make the
changes. It's quicker that way.

 

[Matthew Lock]

Validation of data the user enters in registration forms etc should
be

checked client side as they can then correct those mistakes straight away
rather than sending off the incorrect info and then being asked to make the
changes. It's quicker that way.

No! You should check on the server side as a naughty user can disable
Javascript and just submit whatever they want to your server program,
causing all manner of security risks.

 

[Matthew Lock]

What types are usually written on the client side?

The only validation that belongs on the client side is validation that
you could live with the user bypassing, by disabling javascript.

1. In this site users will be able to log in.
2. I will have a register page.
3. My accounts page.
4. And a page that they can post listings in.
5. An admin page that will keep track of billing accounts.

None of these are candidates for client side validation. They should
all be done on the server side. (Especially the billing one!)

 

[David Dorward]

Yes!

You should check on the server side

You should do that to, and you should make it a priotity, but it can be
useful to users to have a second (earlier) check on the client side.