JavaScript is essential in the creation of powerful web sites and applications. In Practical and Effective JavaScript, instructor Joe Marini presents the next level of features that experienced developers need to streamline their workflows and introduce dynamic new functions to their projects. Joe teaches tips for improving JavaScript performance, ways to separate programming behavior from page content, and principles for understanding the modern DOM event model. Finally, Joe introduces some of the more advanced concepts recently built into JavaScript. An understanding of the JavaScript language is a prerequisite for this course, which includes exercise files.
Topics include:
- Using built-in language features
- Creating reusable modules to save programming time
- Dealing with dynamic and complex events
- Understanding object-oriented JavaScript
- Reviewing practical JavaScript examples to use in the workplace
- Discovering tools for debugging and developing websites
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Frequently asked questions
Find answers to the most frequently asked questions about Practical and Effective JavaScript.
- Q: There is a discrepancy between the tutorials and the exercise files that is causing me some confusion. For example, in the movie "Handling complex effects" in Chapter 3.Exercise File:function addEventHandler(oNode, evt, oFunc, bCaptures) {if (typeof (oNode.attachEvent) != "undefined")Video:function addEventHandler(oNode, evt, oFunc, bCaptures) {if (typeof (window.event) != "undefined")Exercise Files:if (e.cancelBubble != null) e.cancelBubble=true;else e.stopPropagation();Video:if (e.eventPhase) {if (e.eventPhase != 1 } stopEvent(evt);}
The event handlers' capture value is also reversed for I.E./Firefox between the videos and exercise files. What's going on? - A: We made these changes to the videos because they more accurately reflect the capabilities that are being tested for in the browser, and because the WebKit-based browsers added support for a window.event property ,which was throwing off the test and causing the code to think that it was running inside IE when it wasn't.Testing for the presence of the attachEvent method is much more accurate than the old test.
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