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Form validation generally performs two functions.īasic Validation – First of all, the form must be checked to make sure data was entered into each form field that required it. JavaScript, provides a way to validate form’s data on the client’s computer before sending it to the web server. This was really a lengthy process and over burdening server. If some of the data that had been entered by the client had been in the wrong form or was simply missing, the server would have to send all the data back to the client and request that the form be submitted with correct information. ![]() Form validation used to occur at the server, after the client had entered all necessary data and then pressed the Submit button.
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