14 Jul 2025

Form verification can improve efficiency through HTML5 native mechanism. 1. Use the required attribute to ensure the required fields; 2. Use the input type (such as email, number) and pattern attributes to verify the data format; 3. Use the setCustomValidity() method and CSS to adjust the error prompts and styles to optimize the user experience.

04 Jul 2025

Form verification can be achieved through built-in HTML5 features, without relying on JavaScript. Use required, min/max, and pattern attributes to ensure the legality of input; use the browser's default error prompts or custom content; improve the interactive experience through the CSS's :valid/:invalid pseudo-class; at the same time, it is necessary to pay attention to compatibility, and combine back-end verification and testing to ensure cross-browser compatibility.

02 Apr 2025

It's kind of neat that we can do input:invalid {} in CSS to style an input when it's in an invalid state. Yet, used exactly like that, the UX is pretty bad.

12 Jul 2025

How to set custom error message with JavaScript? 1. Use the setCustomValidity() method combined with native form verification, and set prompts for specific input conditions through JavaScript. For example, when the username is less than 3 characters, it prompts "the username needs at least 3 characters"; 2. Combine HTML attributes (such as required, pattern) and JS supplementary verification, and return targeted prompts according to different reasons for verification failure. For example, when the email format is inconsistent, "the email must end with @example.com"; 3. Note that after each verification, you need to call setCustomValidity('') to clear the error message and select the appropriate event (input and i)

07 Jul 2025

The pattern attribute of HTML5 is verified by regular expressions. Common scenarios include: 1. The password requires at least uppercase and uppercase letters, numbers and the length is no less than 8 digits, pattern="(?=.\d)(?=.[a-z])(?=.*[A-Z]).{8,}"; 2. Phone number such as 123-456-7890 format, pattern="\d{3}-\d{3}-\d{4}" or more flexible; 3. Email address restricts domain name suffix, pattern="[a-zA-Z0-9._% -] @[a-zA-Z0-9.-] .[a-zA-Z

17 Feb 2025

Key Takeaways HTML5 introduced new form attributes for browser-based form validation, but it has restrictions such as inability to customize error messages and style, and the need to create patterns for input fields. jQuery form validation plugins

24 Jun 2016

Html5 Css3 Banner Animation multi-directional movement effects

01 Dec 2024

Styling HTML Form Validation Error Messages with CSS: A Current LimitationWhile HTML form validation provides valuable functionality, customizing...

08 Nov 2024

Customizing HTML5 Form Validation PopupsWhen utilizing HTML5 forms, the default validation popups can sometimes be unsatisfactory. However, it's...