Validating a form in javascript


02-Sep-2016 21:05

It is important to validate the form submitted by the user because it can have inappropriate values. The Java Script provides you the facility the validate the form on the client side so processing will be fast than server-side validation.

So, most of the web developers prefer Java Script form validation.

The name can’t be empty and password can’t be less than 6 characters long. The user will not be forwarded to the next page until given values are correct.

Using client side Java Script is an efficient way to validate the user input in web forms.

is the external Java Script file which contains the Java Script ocde used to validate the form. Notice that for validation, the Java Script function containing the code to validate is called on the on Submit event of the form. Flowchart : Here is the entire Java Script used for validation of the form.

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The zip file contains the javascript file, examples.

When the user does so, they may proceed and can supply value to the next available field.

The later Java Script function created is called on the onsubmit event of the form. If Male or Female is selected, it generates an alert saying that the form is successfully submitted and it reloads the form.

(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.

We also want to help our users to fill out our forms correctly and don't get frustrated when trying to use our apps.