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If you?re into the whole separation of behavior and structure thing, you know that unobtrusive JavaScript is the way to go. Chris goes over three different methods of validating your forms without mucking up your markup.
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Got a submissions form that you keep getting multiple submissions from? I\'ve found that in most cases its because people are impatient and click the submit button repeatedly until they get a response. The unfortunate result is that you receive multiple copies of the same form. This little bit of JavaScript disables the submit button as soon as it is clicked for the first time and prevents the user sending their form multiple times. Script now also changes the text on the button to \'Thanks\' (this can be modified to suit)
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In forms when using text boxes or text areas and check boxes you might need a reset button that is not the usual gray HTML button. For this you can use a small JavaScript function as given below. Note: This button will reset only text boxes,text areas and check boxes as list boxes and option buttons don\'t usually require resetting. After resetting the form the cursor will set the focus to the first field in the form.
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In forms when using text boxes or text areas with limited character length (usually needed for forms that submit data to a database) it is always a good idea to tell the user how many characters they have remaining. The following example shows how you can do this. This is a very simple and cute idea to help the user know exactly how many characters he can type further. Do these small add-ons to your forms and they will look really professional.
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A combo box results from the mating of a text field and a select element. Users can select from a list, or they can type into the field. Ryan has brought a desktop programmer?s fantasy to the web through minimal markup, CSS and DOM.
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A Guide to Unobtrusive Javascript Validation