By Brandon Satrom
ISBN-10: 144937073X
ISBN-13: 9781449370732
Upload customized positive aspects to browsers previous and new through writing polyfill libraries, JavaScript plugins that take browsers past their local functions. during this functional fieldbook, writer Brandon Satrom introduces ideas and instructions for polyfill improvement, after which walks you thru the stairs for development a posh, real-world HTML5 polyfill. you are going to additionally discover the way forward for polyfilling - or prollyfilling - that may assist you try and paintings with rising options, frequently sooner than browser owners. by the point you end this ebook, you will have the instruments and hands-on adventure you want to construct trustworthy polyfills for modern and tomorrow's internet.
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Extra resources for Building Polyfills: Web Platform APIs for the Present and Future
Example text
2. Perform feature detection on behalf of (or in addition to) the user. The first approach is common for polyfills that cover a limited feature-set, or those that are activated on a per element or frequent basis. As Modernizr is widely used by devel‐ opers, it’s common to see polyfills used in a manner similar to Example 1-3. In this example, I’m using Modernizr to query for CSS border-radius support and, if it’s not available in the user’s browser, I’ll opt in to PIE for a given set of elements.
You may be the first user, but you don’t want to be the only one. As such, planning the creation of your polyfill should be an exercise in thinking about the variety of needs and contexts that developers will bring to the table when using your library. I call this practice responsible polyfilling because it’s not just for yourself and your needs, but for the needs of as many developers as possible. This means that you need to think about things like performance, the execution environment, and even planned obsoles‐ cence.
Info | 37 Example 3-6. Form). kendoForm. plugin(Form); } (jQuery, kendo)); In this sample, I’m looking for every input on my form with the attribute type=color and initializing a kendoColorPicker for each, using the basic palette option. The HTML5 specification doesn’t have anything to say about what the color control should look like or how it should behave, visually, so I’ve chosen a sensible default for the ColorPicker. Now, when I view the sample form in Safari, Firefox, or Internet Explorer (all browsers that do not support the color type at the time of writing), I’ll see a Kendo UI ColorPicker in place of the default text input, as seen in Figure 3-4.
Building Polyfills: Web Platform APIs for the Present and Future by Brandon Satrom
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