My form is below: Here I print the JSON result on success and failure. But,when I run the application it just prints the json result instead of returning it back to the success/failure function in the js file.Please point if I am missing anything or point to relevant links which may be useful.A Java Script check is useful because it stops the form from being submitted if there is a problem, saving lots of time for your readers.The CGI script is still more reliable, as it always works regardless of whether Java Script is enabled on the client-side or not; but having this extra safety barrier is a nice thing to have in place.
A "standard" submit is the old-school, full-page redirect style of submitting, which appears to not be what you want. Instead of redirecting it goes in the failure part and prints the JSON returned by the 2nd servlet(which fetches grid data.). What want is on success the page to be redirected to the grid page and display the grid with content. Also marked your comments and made the changes regarding files.
In all cases, the form is called That's checking the value's equality with a null String (two single quotes with nothing between them).
When you are asking a reader for their email address, you can use a simple » address validation function to make sure the address has a valid structure. Each option in a drop-down box is indexed in the array Annoyingly, there is no simple way to check which radio button out of a group is selected — you have to check through each element, linked with Boolean AND operators .
In client side validation the data is validated in the browser using Java Script before submitting the data to the server.
For example, suppose your user submits the form without entering a mandatory field.