TAILIEUCHUNG - JavaScript Bible, Gold Edition part 168

JavaScript Bible, Gold Edition part 168. This book will bring programmers and non-technical professionals, including casual programmers and scripters, painlessly up to speed on all aspects of mastering JavaScript. Key topics include programming fundamentals, JavaScript language elements and how to use them effectively, and how to easily and efficiently add powerful new functionality to HTML documents and Java applets. | CD-162 Part VI Appendixes The result some number is now displayed in the output TEXTAREA. This means that the content of the output element was scrolled vertically. Click the Evaluate button once more. The result 0 is a measure of the scrollTop property of the TEXTAREA that had only the previous result in it. There wasn t enough content in the TEXTAREA to scroll so the content was not scrolled at all. The scrollTop property therefore is zero. The scrollLeft property of the output is always zero because the TEXTAREA element is set to wrap any text that overflows the width of the element. No horizontal scrollbar appears in this case and the scrollLeft property never changes. sourceindex NN2 NN3 NN4 NN6 IE3 J1 IE3 J2 IE4 IE5 Compatibility Example While the operation of this property is straightforward the sequence of elements exposed by the property may not be. To that end you can use The Evaluator Chapter 13 to experiment in IE4 with the values that the sourceindex property returns to see how the index values of the collection follow the source code. To begin reload The Evaluator. Enter the following statement in the top text box to set a preinitialized global variable a 0 When you evaluate this expression a zero should appear in the Results box. Next enter the following statement into the top text box a .tagName a There are a lot of plus signs in this statement so be sure you enter it correctly. As you successively evaluate this statement repeatedly click the Evaluate button the global variable a is incremented thus enabling you to walk through the elements in source code order. The sourceindex value for each HTML tag appears in square brackets in the Results box. You generally begin with the following sequence HTML 0 HEAD 1 TITLE 2 Appendix F Examples from Parts III and IV CD-163 You can continue until there are no more elements at which point an error message appears because the value of a .

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