Web Reference: Oct 5, 2025 · For this reason, when these web apps want to submit form data, they use HTML forms only to collect input from the user, but not for data submission. When the user tries to send the data, the application takes control and sends the data using a JavaScript API such as fetch(). Summary: in this tutorial, you will learn about JavaScript form API: accessing the form, getting values of the elements, validating form data, and submitting the form. HTML form validation can be done by JavaScript. If a form field (fname) is empty, this function alerts a message, and returns false, to prevent the form from being submitted:
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