itextsharp barcode vb net oSelectappendChild(oOption); g_anchorCount++; // increment the anchor count in Java

Printing Data Matrix ECC200 in Java oSelectappendChild(oOption); g_anchorCount++; // increment the anchor count

oSelectappendChild(oOption); g_anchorCount++; // increment the anchor count
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Inserting the Bookmark List into the Document
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After the main loop in the buildBookmarks() function completes, the user interface controls are inserted into the top of the document by the insertBookmarkList() function with the <FORM> node as the argument:
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insertBookmarkList(oForm);
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The Document Object Model: Processing Structured Documents
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The function finds the <BODY> tag of the document by calling getElementsByTagName()
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// get the BODY tag var oBody = documentgetElementsByTagName("BODY")[0];
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Then the form node, passed as the oBookMarkNode argument, is inserted into the document s body as the first child node:
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oBodyinsertBefore(oBookMarkNode,oBodyfirstChild);
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At this point, you once again have to resort to some trickery in Internet Explorer It seems that IE will not call any JavaScript methods or event handlers if the document s DOM has been modified directly unless the document is forcibly reparsed This can be accomplished by setting the <BODY> tag s innerHTML property to itself:
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oBodyinnerHTML = oBodyinnerHTML;
Netscape doesn t require this trick; however, because this has no adverse effect in Netscape, you simply have it happen in both browsers without enclosing it inside a browser-specific function
Responding to the User s Bookmark Selection
Now all that is left is to handle the user s clicking the Go button When the Go button is clicked, the jumpToBookMark() function is called:
function jumpToBookMark() { var oSelect = documentgetElementById("bookmarks"); var selOption = oSelectselectedIndex; var newURL = g_docLoc + "#" + oSelectoptions[selOption]value; documentlocation = newURL; }
The function finds the <SELECT> list by calling getElementById() with the ID that you previously assigned to it ( bookmarks ) It then extracts the value of the currently selected option, which will be the name of a named anchor tag in the document It then sets the document s location property to the original URL plus the name of the anchor tag, which causes the browser to jump to that location in the document Now, to use this script, the developer needs to identify the places in a given document that will be accessible as bookmarks, place the special bookmark <SPAN> tags at those locations, include the Bookmarksjs file in the page, and trigger the
8: Providing Automatic Document Navigation
buildBookmarks() function from the <BODY> tag s onLoad handler to automatically build the list of bookmarks for that page
Example: Automatic Table of Contents
Although the on-the-fly bookmark generator works well, its main drawback is that it isn t fully automatic The author has to manually go through the document and mark each place where a bookmark should appear, which can be time consuming if you have a large number of documents or documents with a lot of content in them A better solution would be totally automatic and would allow the user to control the visibility of the user-interface elements The automatic table of contents generator accomplishes these requirements It builds a table of contents for a given page by reading the content of the document when it is loaded and creating a list of links to the <H1> and <H2> tags contained within the page When finished, the list can be displayed at the top of the page in the form of an ordered or unordered list, as shown in Figure 8-2
Figure 8-2
Automatically generated table of contents
The Document Object Model: Processing Structured Documents
Listing 8-2 lists the code for generating a table of contents automatically This code is stored in a separate file named buildTOCjs and is included in the target web page using a <SCRIPT> tag with a SRC attribute, like this:
<SCRIPT SRC="buildTOCjs"></SCRIPT>
To create the list of bookmarks, your page should call the buildTOC() function from the web page s onLoad event handler
Listing 8-2
var var var var var
Automatic Table of Contents Generator
gNodeCounter = 1; // keeps track of the current indent level gbDoH1=true, gbDoH2=true; // flags for H1 and H2 oCurNode = null; sLastNodeAdded=""; gTOCNode = null;
function buildTOC() { // create the root of the TOC as an unordered list gTOCNode = documentcreateElement("UL"); oCurNode = gTOCNode; // initialize the current node oBodyNode = documentgetElementsByTagName("BODY")[0]; nodeScanner(oBodyNode); // build the table of contents // insert the TOC at the top of the BODY oBodyNodeinsertBefore(gTOCNode, oBodyNodefirstChild); } // scans all of the nodes in the document in document order function nodeScanner(oNode) { processNode(oNode); var chld; chld = oNodefirstChild; while (chld) { nodeScanner(chld); chld = chldnextSibling; }
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