Along with explanation this is a JavaScript that you can use with your forms to make sure that your visitors complete the necessary fields in your forms before the submission.

This JavaScript example shows how to create a form that has a portion of the form shown (or hidden) upon certain user events. (radio button selection by the user in this example) Note: Netscape has a problem with embeding a portion of a form inside a DIV/SPAN/LAYER, which is why there are three forms shown here, but once you have the values, its easy enough to pull the information together before running the target of the frame.

This shows another method to verify text boxes input and then put the focus into missing data boxes. It also checks some things to see if the email is "valid" - other tests could be added as determine viable. The alerts can be used, but they conflict with the focus thing going on.

This simple cut-and-paste script opens the Print Dialogue, and lets your visitor print out the current page. Useful for information pages, script pages, receipt pages, etc.

This series of functions provide common form validation for required fields, dates, numbers, and email addresses.

you can use this JavaScript to ensure that all elements of a form are properly filled out before they can be mailed to you. It uses cookies for the form validation.

This is a script that closely examines the content of a form box to ensure that the user entered a valid email address. If not, the form submition is canceled, and the surfer prompted to re-enter a valid address.

Client side java script is the efficient way to validate the user input in web forms. It gives the response immediately and reduces the server load. But, when there are many forms in the project and when the forms are long, writing the form validations becomes a daunting, repetitive task. Save yourself from coding long validations for your forms. Here is a simple, powerful form validation code. Using this code, you can do the common form validations in a snap.

qForms is a complete JavaScript API for interfacing forms. It will not only simplify your work, but will also give you the ability to create more complex form-based interaction. qForms was designed with everyone in mind—from the complete JavaScript novice to the most sophisticated guru. In this session, we’ll cover all the basics of the API as well as how to create your own add-ons. qForms is an open-source JavaScript API released under the GNU LGPL.

This JavaScript demonstrates how to determine which options of a checkbox are selected.