Validating a form in javascript

The property in conjunction with our input types and HTML validation attributes, we can build a robust form validation script that provides a great user experience with a relatively small amount of Java Script. Since we're writing our validation script, we want to disable the native browser validation by adding the attribute to our forms.We can still use the Constraint Validation API — we just want to prevent the native error messages from displaying.First, we need to modify our When we go to remove the error, we similarly need to check if the field is a radio button that's part of a group, and if so, use the last radio button in that group to get the ID of our error message.See the Pen Form Validation: Fixing Radio Buttons & Checkboxes by Chris Ferdinandi (@cferdinandi) on Code Pen.

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We should also bring the first field with an error into focus so that the visitor can immediately take action to correct it.

There are a few different methods the API exposes, but the most powerful, Validity State, allows us to use the browser's own field validation algorithms in our scripts instead of writing our own.

In this article, I'm going to show you how to use Validity State to customize the behavior, appearance, and content of your form validation error messages.

Also note we fire the validation on submit rather than as every field is modified.

The final thing to note is that each of the three fields has a corresponding logic (which is run on submit remember) checks for name and age only as movie is optional. Don’t forget that on a successful submission it’s going to POST to a temporary URL.

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