Web Reference: Feb 28, 2017 · I have some troubles to validate user input while they are typing. For example: the valid range is 600-800 and user is trying to type 700. When textbox is 7: show red. When textbox is 70: show red. When textbox is 700:show nothing. I hope I can do it in js, can anyone help me? Dec 5, 2025 · This client-side form validation helps ensure data entered matches the requirements set forth in the various form controls. This article leads you through basic concepts and examples of client-side form validation. 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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