Validating form data using javascript

HTML Code of the Sample Registration Form 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.For the sake of demonstration, we have taken five countries only. CSS Code of the Sample Registration Form The code above checks whether a sex is selected. If Male or Female is selected, it generates an alert saying that the form is successfully submitted and it reloads the form.It goes on to explain how you can use Java Script to read data from forms, validate form entries, and send form results by email.In this hour you'll explore one of the most powerful uses for Java Script: working with HTML forms.A word of warning though: not all browsers implement the attribute accessibly, so it might not be picked up correctly in certain browser / screen reader combinations.As such, current best practice recommends supplementing the required attribute with the aria-required=”true” attribute: Now that our users get prompted to complete required fields, we need to make sure that the data they submit is in the format we require.

So if an older browser doesn't support them, the fact that they're in the HTML won't 'break' anything, they’ll just be rendered as an NB While client-side form validation is great for enhancing user experience—fast, instant feedback to the user without making a round trip to the server—you will still need to validate any data submitted on the server, too.

You can use Java Script to make a form more interactive, validate data the user enters, and enter data based on other data.

This hour covers the following topics: Forms are among the most useful features of the HTML language.

But this time, the instead of on submitting the form, validations are on field level, i.e. Sure that will be preety interesting to learn and share as well.

A few months ago Sandeep introduced us to the HTML Constraint API, showing how we can use the new HTML5 input types and attributes to validate our forms in the browser with minimal Java Script.

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And we welcome any constructive suggestions to improve this example.

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