HTML5 Mullet: Forms & Input Validation

Aug 30, 2012Download as ppt, pdf

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Todd Anglin gave a presentation on HTML5 forms and input types. He discussed the new input types available like email, url, number and date/time. He demonstrated how to use these new input types and attributes like placeholder, required and pattern. Anglin also covered customizing the browser rendered inputs using shadow DOM and styling validation states with CSS. For older browsers without native support, he recommended polyfilling the new functionality with JavaScript.

@t oddanglin

VP HTML5 Web & Mobile Tools, Telerik
Microsoft MVP, ASP Insider, O'Reilly Author

htmlui.com
@htmlui

HTML5 forms & input:
learning goals
• what’s available?
• how do you use it?
• how do you customize the
default experience?
• how do you make it work in
older browsers?

Enter your email: <input type="text" />
<input type="submit" value="Submit" />

In HTML4…
• Everything’s a text box
• Lots of JavaScript

<input type="_________" />

text checkbox
password radio
hidden submit
file reset
image
button

HTML4

Wouldn't it be nice if…
• Browsers understood different
data types
• Browsers tailored input
methods to data types
• Browsers could do basic
validation

• New input types
• New rendering
• New input features
– EX: Placeholder Text, AutoFocus

Backwards compatible!

<input type="_________" />

text url checkbox
password search radio
hidden color submit
file number reset
email range image
tel datetime* button

HTML5

State of the Browsers
(Mid 2012)

A B A+ B+ B-

21 11 11.6 6 9

$[No unique keyboard for Date/Time] Chrome for Android improves the story, but only available to fraction of Android users.$

"Can I customize browser
rendered input elements
(like calendar or range
slider)?"
Nope. Not yet. Not really.

Shadow DOM
input[type=range].custom::-webkit-slider-thumb

Enter your email:
<input type="email" placeholder="Enter
your email" required title="Please
enter your email" />
<input type="submit" value="Submit" />

New Attributes
• More control over input
behavior
– Still no JavaScript
– Improved usability
– NoValidate
• Attributes: – FormNoValidate
– Placeholder
– Accept
– Autofocus
– Multiple
– Max Length
– Min/Max
– List
– Step
– AutoComplete
– Required
– Pattern

Validation
• Handled by browser
– Can be disabled via form
novalidate
• Saves JavaScript
– Less to download = faster loading
apps

Does not replace server-
side validation

Customizing validation HTML
• Change message
– In Chrome, use input title attribute
(Not FF, O, S)
• Pattern attribute

JavaScri
Validation API pt

• JavaScript for greater control

checkValidity() setCustomValidity()

CSS Styling for Validation CSS

New states:
valid in-range
invalid out-of-range
required ready-only
optional write-only

Lowest common denominator?
Including IE9?

NOTHING.
:(

Older Browsers
1. Polyfill
2. JavaScript fallbacks

Please remember to complete and
return your session eval forms.

@toddanglin | anglin@telerik.com

THANKS!

www.KendoUI.com

$[No unique keyboard for Date/Time] Chrome for Android improves the story, but only available to fraction of Android users.$

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