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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'</TITLE>\n' + '<STYLE TYPE="text/css">\nPRE {font-family:sans serif;' + 'font-size:12pt}\n</style>\n</head>\n\n' + '<BODY BGCOLOR="#FFFFFF">\n\n<pre>'); Dump(startNode, indentStr); CloseDumpDocument(); }
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The code begins by defining some global variables that will be used throughout the rest of the code The gDumpWindow variable will be used to hold a reference to the dump window that is created to hold the output The gIndentStr variable holds the string that is used to indent each line of the output The gbShowCRLF controls whether \n and \r characters in the source are displayed as [LF] and [CR] The remaining variables control the colors used in the output to make the various parts of document structure easier to identify The DumpDOM() function performs only a few functions First, it calls the windowopen() method to create a new window to hold the output Next, it uses the documentwrite() method to write the HTML infrastructure to the output document The entire body content of the document is wrapped in a <PRE> element so that the indentation of each string will be displayed properly by the browser After the document has been created and initialized, the Dump() function is called to write the contents of the DOM to the window s document Finally, the CloseDumpDocument() function is called to clean up and write the closing HTML code to the dump window The workhorse of the DOMDumper tool is the function that generates the output Listing 7-8 contain the code for the Dump() function
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Listing 7-8
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The Dump() Function
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function Dump(oNode,indentString) { var sNodeContent = ''; var sNodeStr = ''; var arrChildren = oNodechildNodes; // check the node type switch (oNodenodeType) { case 1: // Element Node sNodeContent = "<span style='color:" + gElemColor + "'>"; sNodeContent += "Element: " + oNodetagName;
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7: Debugging DOM Applications
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if (oNodegetAttribute("id") != "") sNodeContent += ", ID=" + oNodegetAttribute("id"); break; 2: // Attribute Node sNodeContent = "<span style='color:" + gAttrColor + "'>"; sNodeContent += "Attr: " + oNodename + "=" + oNodevalue; break; 3: // Text Node sNodeContent = "<span style='color:" + gTextColor + "'>"; var theNodeData = oNodedata; if (gbShowCRLF) { theNodeData = theNodeDatareplace(/\n/g,"[LF]"); theNodeData = theNodeDatareplace(/\r/g,"[CR]"); } sNodeContent += "Text: " + theNodeData; break; 4: // CDATA Node sNodeContent = "<span style='color:" + gCDATAColor + "'>"; sNodeContent += "CDATA Section: " + oNodedata; break; 5: // Entity Reference Node sNodeContent = "<span style='color:" + gEntityRefColor + "'>"; sNodeContent += "Entity Reference"; break; 6: // Entity Node sNodeContent = "<span style='color:" + gEntityColor + "'>"; sNodeContent += "Entity: publicId=" + oNodepublicId + " systemId=" + oNodesystemId + " notationName=" + oNodenotationName; break; 7: // Processing Instruction Node sNodeContent = "<span style='color:" + gPIColor + "'>"; sNodeContent += "Processing Instruction target=" + oNodetarget + " data=" + oNodedata; break; 8: // Comment Node sNodeContent = "<span style='color:" + gCommentColor + "'>"; sNodeContent += "Comment: " + oNodedata; break; 9: // Document Node sNodeContent = "<span style='color:" + gDocElemColor + "'>"; sNodeContent += "Document Node"; break; 10: // Document Type Node sNodeContent = "<span style='color:" + gDocTypeColor + "'>"; sNodeContent += "Document Type: " + oNodename; break; 11: // Document Fragment Node
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The Document Object Model: Processing Structured Documents
sNodeContent = "<span style='color:" sNodeContent += "Document Fragment"; break; case 12: // Notation Node sNodeContent = "<span style='color:" sNodeContent += "Notation publicId=" " systemId=" break; }; sNodeContent += "</span>"; + gDocFragColor + "'>";
+ gNotationColor + "'>"; + oNodepublicId + + oNodesystemId;
sNodeStr = indentString + sNodeContent + "\n"; gDumpWindowdocumentwrite(sNodeStr);
for (var i=0; i < arrChildrenlength; i++) { Dump(arrChildren[i], indentString + gIndentStr); } }
There s no real magic behind the Dump() function: it s essentially a giant switch() statement that writes out certain properties of a node depending upon the node type For example, for Element nodes, the Dump() function writes out the tagName property and ID attribute, if one exists for the node After it writes out the node string, the Dump() function recursively calls itself for each of the node s child nodes Listing 7-9 shows the code that finishes up writing the output to the dump window
Listing 7-9
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