Form Validation in JavaScript
Form Validation is usually used on the Server, after the Client has entered all necessary data and then click the Submit button. If the data entered by a Client is incorrect or corrupted, the Server must send all data back to the Client and request that the Form be submitted with the correct information. This is really a long process that puts a lot of burden on the Server.
JavaScript provides a way to verify Form data on a Client's computer before sending it to the Web Server. Form Validation generally performs two functions:
- Basic Form Validation - First, the Form must be checked to ensure that all required fields are fully entered. It will require only one loop through each field in the Form and check the data.
- Data Format Validation - Second, the entered data must be checked for the accuracy of the Form and the value. Your code must be logically appropriate to check the accuracy of the data.
For example
We will look at the following example to understand the evaluation process. Here is a simple form in HTML format.
Form Validation
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