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[2002-05-30] Validating Forms with JavaScript
JavaScript is not a true security measure, but rather an added level of security and convenience for your users. Because JavaScript is a client-side technology (whereas PHP is server-side), incorporating it into your web pages can save users the hassle of having to submit a form to the Web server, have it checked by PHP, and then have the data sent back when there are errors. Instead, you can use JavaScript to immediately run through some tests and then, if the data passes, send the form information along to PHP. However, JavaScript does this of the cost of a larger file size for the user to initially download.
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