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How to let HTML input text value from javascript function call return value?

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Last Modified: 2013-11-19
I have a HTML page with form and various input fields. However, the default value of some input fields should be calculated dynamically from return value of some java script. Also when the submit type button is clicked, all input fields should be validated before invoking the sever side PHP script. Could someone tell me how to do it? Thanks!
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