455Chapter 19 .Body Text Objects than you may (Vps web hosting)
Sunday, July 22nd, 2007455Chapter 19 .Body Text Objects than you may think at first, especially in a function that is traversing the body or large chunk of text. For example, in a typical looping word-counting script, you create a text range that encompasses the full body (or text in a TEXTAREA). When the range is created, its start point is at the very beginning of the text, and its end point is at the very end. To begin counting words, you can first collapse the range to the insertion point at the very beginning of the range. Next, use the expand() method to set the range to the first word of text (and increment the counter if the expand() method returns true). At that point, the text range extends around the first word. What you want is for the range to collapse at the end of the current range so that the search for the next word starts after the current one. Use collapse()once more, but this time with a twist of parameters. The optional parameter of the collapse() method is a Boolean value that directs the range to collapse itself either at the start or end of the current range. The default behavior is the equivalent of a value of true, which means that unless otherwise directed, a collapse() method shifts the text range to the point in front of the current range. That works great as an early step in the word-counting example, because you want the text range to collapse to the start of the text before doing any counting. But for subsequent movements through the range, you want to collapse the range so that it is after the current range. Thus, you include a false parameter to the collapse()method. On the CD-ROM Example on the CD-ROM Related Items: Range.collapse(), TextRange.expand() methods. compareEndPoints( type , rangeRef) Returns: Integer (-1, 0, or 1). NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility . . Generating multiple TextRange objects and assigning them to different variables is no problem. You can then use the compareEndPoints()method to compare the relative positions of start and end points of two ranges. One range is the object that you use to invoke the compareEndPoints() method, and the other range is the second parameter of the method. The order doesn t matter, because the first parameter of the method determines which points in each range you will be comparing. Values for the first parameter can be one of four explicit strings: StartToEnd, StartToStart, EndToStart, and EndToEnd. What these values specify is which point of the current range is compared with which point of the range passed as the second parameter. For example, consider the following body text that has two text ranges defined within it: TextRange.compareEndPoints()
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