itextsharp barcode vb net The Document Object Model: Processing Structured Documents in Java

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The Document Object Model: Processing Structured Documents
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Next, an anchor tag is created that will link the list item in the TOC to the location of the heading tag in the text The text for the anchor tag that will appear in the TOC is the same as the text content of the heading node:
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// create A tag for the list item to link to the heading var oAnchor = documentcreateElement("A"); oAnchorsetAttribute("href","#"+gNodeCounter); oLINodeappendChild(oAnchor); // text content for the A tag is innerHTML of the H1 or H2 var textContent = oNodeinnerHTML; var oTextNode = documentcreateTextNode(textContent); oAnchorappendChild(oTextNode);
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Now you just need to insert a named anchor in the heading tag that will serve as the link destination for the TOC entry Internet Explorer has issues with setting the name of an <A> tag directly via the DOM, so you should do it using the innerHTML property of the heading node This also works in Netscape, so you don t need to enclose it in browser-specific checking code
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oNodeinnerHTML = "<a name=\""+ gNodeCounter++ + "\"></A>" + oNodeinnerHTML;
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Finally, the list item is added to the TOC by calling addTOCNode():
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if (oLINode) addTOCNode(oLINode,oNode);
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Adding the TOC Entry
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The addTOCNode() takes the list item that will be the TOC entry and adds it to the global gTOCNode object You want the entries for <H2> tags to be properly indented underneath the <H1> entries, so the script has to keep track of what kind of heading tag the most recently added TOC entry was for The addTOCNode() method first checks the special case where the very first TOC entry is being added
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if (oCurNode == gTOCNode) { gTOCNodeappendChild(oNewNode); oCurNode = oNewNode; sLastNodeAdded = "H1"; }
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8: Providing Automatic Document Navigation
If this is not the first TOC entry, the code checks to see what kind of heading tag the TOC entry corresponds to If it is an <H1> tag, the TOC entry is added at the top level of the TOC list:
if (oRefNodenodeName == "H1") { // h1 nodes are always children of the root UL gTOCNodeappendChild(oNewNode); oCurNode = oNewNode; sLastNodeAdded = "H1"; }
Otherwise, if the TOC entry is for an <H2> tag, the script checks to see what the most recently added TOC entry was for If it was for an <H1>, the TOC list needs to first indent the new entry under the most recent one:
else if (oRefNodenodeName == "H2") { // if current node is H1, add it as a child of the H1 if (sLastNodeAdded == "H1") { var oUL = documentcreateElement("UL"); oCurNode = oCurNodeappendChild(oUL); oCurNodeappendChild(oNewNode); }
If the most recently added TOC entry was for an H2 tag, the code simply adds the new TOC entry as a sibling of the previous one:
// if current node is H2, add the new node as a sibling if (sLastNodeAdded == "H2") oCurNodeparentNodeappendChild(oNewNode); oCurNode = oNewNode; sLastNodeAdded = "H2"; }
When the code is finished, the TOC represents all of the H1 and H2 tags in the document, and the user simply clicks one to be taken to that section of the document
Example: Document Placeholders
Both of the previous examples allow the user to navigate a document by quickly jumping to various locations within the page In this example, we ll provide the user with a simple mechanism for marking their current place in the page so they can
The Document Object Model: Processing Structured Documents
easily find it again if they scroll away from it I came up with this idea while reading the W3C specification because I found myself reading one section and needing to quickly refer to another section in a different part of the page Finding my previous location was a bit of pain because the document has a lot of sections that look very similar to each other The general idea is to temporarily modify the appearance of the part of the page the user is viewing by performing a simple task, such as clicking the paragraph of text they are reading to highlight it When the user clicks, the paragraph s background color changes slightly so it can easily be spotted again later Figure 8-3 shows two paragraphs, one highlighted and one normal Listing 8-3 lists the code for highlighting the selected paragraph in the browser when the user clicks it This code is stored in a separate file named buildPlaceholdersjs and is included in the target web page using a <SCRIPT> tag with a SRC attribute, like this:
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