Form Validation : Introduction - JavaScript Tutorial - EchoEcho.Com

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Advanced Scripts :

FORM VALIDATION

Javascript is a strong tool for validating forms before sending the content.
The most obvious things to check for are whether an emailaddress has valid syntax, or if fields meant for values have text entered, etc.

This page covers the 4 most important techniques.

Consider this form:

Note:
The form is not activated - Try entering values to see what happens.

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FORM VALIDATION

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