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Introduction to validating forms

One of the most practical uses of JavaScript is validating forms. Lets first define what is meant by validating forms. Well, using JavaScript, you can check what a user enters into a form, intercept a form from being submitted and ask the user to retype or fill in the unfilled entries of a form before re-submission. Before, you would have to do this using CGI, which is both something I don't want to touch, and something you don't want to either...you with me? Anyone?

• Tutorial introduction
• The object model of JavaScript
• Accessing forms using JavaScript
• Introduction to validating forms
• Using the onBlur event handler
• Using the onSubmit event handler

Using the onBlur event handler