If it finds any it sends the page back to the reader who then has to re-enter some data, before submitting again.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.Below are the ways to get the value from all types of form elements.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).However no matter alphabet or numbers my alert message pops up. var regx = /^[a-z A-Z\s] $/; = true;if (event.value !
When you submit a form to a CGI program that resides on the server, it is usually programmed to do its own check for errors.
If the element complies than sufunction returns an empty string.
Otherwise it returns a message describing the error and highlight appropriate element with yellow.
Any interactive web site has form input - a place where the users input different kind of information.
This data is passed to ASP script, or some other technology and if the data contains an error, there will be a delay before the information travels over the Internet to the server, is examined on the server, and then returns to the user along with an error message.
For the majority of your users, Java Script form validation will save a lot of time up front, but double-checking the data on the server remains necessary, in case the user has turned Java Script off.