Validating form fields using javascript

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The constraint validation API adds the following properties / methods to DOM nodes.

The property of a DOM node contains the message the browser displays to the user when a node's validity is checked and fails.

Constraint validation is an algorithm browsers run natively when a form is submitted to determine its validity.

On this approach, we took advantage of the constraint validation API to perform validations.

In this tutorial I will: Per the spec how errors are presented to the user is left up to the browser itself.

However, the spec does provide a full DOM API, new HTML attributes, and CSS hooks authors can use to customize the experience.

After the “Edit” button is clicked, a new window will open that allows us to edit the new script: This script also includes a check for an empty string, so that the user can wipe out a wrong string and start from scratch.

You can create forms that submit data to most application servers, including PHP, ASP, and Cold Fusion.

If you use Cold Fusion, you can also add Cold Fusion-specific form controls to your forms. The text can be displayed as a single line, multiple lines, and as a password field where entered text is replaced by asterisks or bullets to hide the text from onlookers.

For this reason, you should always provide encryption for data you want to keep secure. You can add a custom name or label for a button, or use one of the predefined “Submit” or “Reset” labels.

Use a button to submit form data to the server or to reset the form.

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