Script for validating online forms
(16 printed pages) Introduction Getting Started Writing the Validation Script Connecting the Form to the Script Associating Form Fields with Custom Script Code Listing Conclusion When you create forms, providing form validation is useful to ensure that your customers enter valid and complete data.
For example, you may want to ensure that someone inserts a valid e-mail address into a text box, or perhaps you want to ensure that someone fills in certain fields.
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This script is tested on these platforms by the author. If you try it and find that it works on another platform, please add a note to the script discussion to let others know.
The following code shows the implementation of this validate() function.
Now we will see how we can validate our entered form data before submitting it to the web server.
The following example shows how to validate an entered email address.
Form validation normally used to occur at the server, after the client had entered all the necessary data and then pressed the Submit button.
The script has a catalog of almost all the common validation types built-in.
The idea is to create a set of “validation descriptors” associated with each element in a form.
Java Script provides a way to validate form's data on the client's computer before sending it to the web server. First let us see how to do a basic form validation.
In the above form, we are calling validate() to validate data when onsubmit event is occurring.