Building Polyfills: Web Platform APIs for the Present and by Brandon Satrom

By Brandon Satrom

Upload customized beneficial properties to browsers previous and new through writing polyfill libraries, JavaScript plugins that take browsers past their local features. during this useful fieldbook, writer Brandon Satrom introduces rules and directions for polyfill improvement, after which walks you thru the stairs for construction a fancy, real-world HTML5 polyfill. you will additionally discover the way forward for polyfilling - or prollyfilling - that would allow you to attempt and paintings with rising recommendations, usually prior to browser proprietors. by the point you end this e-book, you should have the instruments and hands-on event you want to construct trustworthy polyfills for contemporary and tomorrow's net.

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Additional resources for Building Polyfills: Web Platform APIs for the Present and Future

Example text

1 Button support and date type support. 2 Add support for progress and datalist elements; add a placeholder fallback and search box UI; autocomplete attribute support. 3 Add validation support. In addition to creating a road map and plan for your polyfill, you’ll want to consider whether there’s anything under the technology umbrella of your polyfill that you don’t plan to or cannot support. Sometimes it’s not possible to reliably polyfill an aspect of a specification, so you’ll want to avoid even trying to support it.

Figure 3-2. info Figure 3-3. info | 35 With my sample form in place, I’ll next need to add a reference to my polyfill source file. js file, which included the skeleton for our Forms widget and polyfill. I’ll add a reference to that file in my sample form, and then add a script block or new file reference to activate the sample form, as illustrated in Example 3-5. Example 3-5. kendoForm(); }(jQuery, kendo)); Now, if I refresh the page in my browser, I’ll see that nothing is different. I’m not getting any console errors, though, which means that my polyfill is being properly initialized.

Input type="submit" formnovalidate value="Save for later" />

As you can see from the sample, it’s a pretty robust form, and it also uses all of the new HTML5 Forms features introduced in the spec, like new input types (such as color and datetime), new attributes (like autocomplete, pattern, or required) and form vali‐ dation features. 1. info | 33 favorite color field, and others. We’ve certainly got our work cut out for us with this polyfill, even without taking oldIE into account!

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