dropbox mac not auto updating - Validating text box
We will change this by adding an onclick event to it: As you will notice, we check whether or not the page is valid, before we do anything.
This is very important, since this code WILL be reached if the clientside validation is not used, for some reason.
Server side validation is performed by a web server, after input has been sent to the server.
Client side validation is performed by a web browser, before input is sent to a web server.
Actually, that's all we need to test the most basic part of the Required Field Validator. Validation is only performed serverside if necessary!
I'm sure that all the attributes of the controls makes sense by now, so I won't go into details about them. You should see something like this: If your browser supports Java Script, which most modern browers do, then you will notice that the page is not being posted back to the server - the validation is performed clientside! To see how it feels, you can add enableclientscript="false" to the Required Field Validator and try again.
You can also apply formatting validation to a textbox question after the fact on the Validation tab.