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| Javascript Form Validation
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| JavaScript can be used to validate data in HTML forms before sending off the content to a server.
The idea behind JavaScript form validation is to provide a method to check the user entered information before they can even submit it. JavaScript also lets you display helpful alerts to inform the user what information they have entered incorrectly and how they can fix it.
Form data that typically are checked by a JavaScript could be:
* If a text input is empty or not
* If a text input is all numbers
* If a text input is all letters
* If a text input is all alphanumeric characters (numbers & letters)
* If a text input has the correct number of characters in it (useful when restricting the length of a username and/or password)
* If a selection has been made from an HTML select input (the drop down selector)
* If an email address is valid
* How to check all above when the user has completed filling out the form
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Sujatha |
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| Html javascript Form Validation |
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| Validating forms with Javascript |
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