HTML5 Form Validation
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This document discusses HTML5 form validation using new input types and attributes that allow for built-in client-side validation without JavaScript. It provides examples of how to add validation for required fields, regular expressions, email, URLs, and numbers. It also discusses new pseudo-classes for visual feedback and the need for fallback validation in older browsers.
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![Regex with pattern
attribute
<input type="text" required
pattern="[A-Za-z-'0-9]+s[A-Za-z-'0-9]+"
placeholder="Firstname Lastname">](https://image.slidesharecdn.com/html5formvalidation-110425172044-phpapp01/85/HTML5-Form-Validation-8-320.jpg)
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- 1. Form Validation with HTML5 Ian Oxley Super Mondays, 26 April 2011
- 2. $ whois • Hi, I’m Ian • Web / Application Developer at Sage • http://ianoxley.com • @ianoxley
- 3. this.talk • HTML5 client-side <form> validation • New <input> types and attributes make this really easy • (Still need to perform validation on the server)
- 4. HTML4 • Client-side validation requires JavaScript • Custom code, jQuery validate, etc. • Extra work to give user optimal UX
- 5. • New <input> types and attributes • Browsers have built-in client-side validation
- 7. Required fields <input type="text" required>
- 8. Regex with pattern attribute <input type="text" required pattern="[A-Za-z-'0-9]+s[A-Za-z-'0-9]+" placeholder="Firstname Lastname">
- 9. Email Validation <input type="email" required placeholder="Enter your email address">
- 10. URL Validation <input type="url" required placeholder="Website or blog">
- 11. Numeric Data <input type="number" value="1" min="1" max="4" required>
- 12. HTML5 Forms + CSS3 • New psuedo classes for better UX • Visual cues and feedback to guide the user
- 14. :valid and :invalid, :in-range and :out-of-range
- 15. No Validation? <form novalidate> ... </form>
- 16. Cross browser? IE Firefox Safari Chrome Opera iPhone Android - 4.0+ 5.0+ 6.0+ 9.0+ - - Source: http://diveintohtml5.org/forms.html#validation
- 17. JavaScript fallback... • Modernizr library for HTML5 detection if (!Modernizr.input.required) { // Validate the old-fashioned way setValidationFallback(); }
- 18. Can also be used... • In browser extensions • Greasemonkey scripts • Prototyping / designing in the browser
- 19. Further info • A Form of Madness http://diveintohtml5.org/forms.html • Forward Thinking Form Validation http://www.alistapart.com/articles/forward-thinking-form- validation/ • New Form Features in HTML5 http://dev.opera.com/articles/view/new-form-features-in-html5/ • Modernizr JavaScript Library http://www.modernizr.com/
- 21. Contact me • Email: [email protected] • Twitter: @ianoxley • Demos: http://ianoxley.com/talks/ html5forms/demos/