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Group validations are in the following format: name[.scope][#id][(args ...)] Try it out here: The form specific options prototypically inherit from the global options.Since they aren't copied, any changes to the globals will propogate through to each validation form on the page.Java Script also lets you display helpful alerts to inform the user what information they have entered incorrectly and how they can fix it.In this lesson we will be reviewing some basic form validation, showing you how to check for the following: This lesson is a little long, but knowing how to implement these form validation techniques is definitely worth the effort on your part.Nonetheless, an alert box can still be used for friendlier messages.Alert box gives only one button "OK" to select and proceed.

For example, nothing prevents a Yeoman generator from being run inside of a graphical tool like an editor or a standalone app.

You can avoid these headaches once and for all with Java Script's amazing way to combat bad form data with a technique called "form validation".

The idea behind Java Script form validation is to provide a method to check the user entered information before they can even submit it.

Displaying messages is as simple as using the function is used to get textual or numerical (or both) data from the user.

It will just put up a dialogue box on screen with any message you’d like to display along with a text box allowing them to input anything they like.