itextsharp barcode vb net The traceArray() Function in Java

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The traceArray() Function
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function traceArray(aTheArray, bIncludeLength, bIncludeElemTypes, bRecursiveTrace) { var thestr=''; var i=0; if (bIncludeLength) traceString("-- Tracing Array with length: " + aTheArraylength + \n"); else traceString("-- Tracing Array object: \n"); for (i=0; i < aTheArraylength; i++) { thestr = g_sIndentStr + "element "+i; if (bIncludeElemTypes) thestr += (" (type: " + typeof(aTheArray[i]) + ") value: "); else thestr += "value: "; thestr += aTheArray[i]; traceString(thestr); if (bRecursiveTrace && typeof(aTheArray[i]) == "object") { // if the object has a length property, then it is an array // Otherwise, just pass the object to the traceObject routine if (typeof(aTheArray[i]length) == "undefined") traceObject(aTheArray[i], bIncludeElemTypes, true, bRecursiveTrace);
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7: Debugging DOM Applications
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else traceArray(aTheArray[i], bIncludeLength, bIncludeElemTypes, bRecursiveTrace); } } }
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The traceArray() function takes four arguments The first argument is the array to be traced The remaining three arguments are Boolean values that specify whether to include the array length in the output, whether to show the type of each element, and whether the array should be traced recursively (that is, when an array element is itself another array, whether that array should be traced as well) The traceNode() method traces the contents of a DOM node to the console window The source for the function is shown in Listing 7-3
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Listing 7-3
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The traceNode() Function
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function traceNode(oTheNode, bShowType, bShowContent, bShowParent, bShowChildCount) { var sOutputString=''; var sID = ''; if (typeof(oTheNodenodeType) != "undefined") { if (oTheNodenodeType == 1) sID = oTheNodegetAttribute("id"); sOutputString = 'Node: ' + sID + '\n'; if (bShowType) { sOutputString += ' } if (bShowParent) { sOutputString += ' Parent: ' + getNodeDescription( oTheNodeparentNode ) + "\n";
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Type: ' + getNodeDescription(oTheNode) + "\n";
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The Document Object Model: Processing Structured Documents
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} traceString(sOutputString); traceString(" Child Nodes: "); if (oTheNodehasChildNodes()) { traceString(oTheNodechildNodeslength + " child nodes\n") } else traceString("None\n"); if (bShowContent) { sOutputString = "Content: "; switch (oTheNodenodeType) { case 1: sOutputString += oTheNodeinnerHTML + "\n"; break; case 3: sOutputString += oTheNodedata + "\n"; break; case 8: sOutputString += oTheNodedata + "\n"; break; case 9: sOutputString += "[Body Content not shown for document nodes]" + "\n"; sOutputString += " URL: " + oTheNodeURL + "\n"; break; } traceString(sOutputString); } } else traceString("traceNode(): Invalid node type specified 'nodeType' property undefined"); }
The traceNode() function takes five arguments The first is the node to be traced The four remaining Boolean arguments specify whether to show the node
7: Debugging DOM Applications
type, its text content, its parent node, and the number of child nodes it has To output the node s content, the traceNode() method uses the innerHTML property that is not part of the DOM standard but is supported by both Internet Explorer 6 and Netscape 6 This version of the traceNode() function has been abbreviated to handle only the common types of document nodes (Element, Text, Comment, and Document), although adding support for the other types would be trivial The getNodeDescription() function used by traceNode() is basically a big switch statement that returns a text description of each node type, as shown in Listing 7-4
Listing 7-4
The getNodeDescription() Method
function getNodeDescription(oTheNode) { if (oTheNode == null) return "null"; switch (oTheNodenodeType) { case 1: return "Element Node (Tag: " + oTheNodetagName + ")"; case 2: return "Attribute Node"; case 3: return "Text Node"; case 4: return "CDATA Node"; case 5: return "Entity Reference Node"; case 6: return "Entity Node"; case 7: return "Processing Instruction Node"; case 8: return "Comment Node"; case 9: return "Document Node"; case 10: return "Document Type Node"; case 11:
The Document Object Model: Processing Structured Documents
return "Document Fragment Node"; case 12: return "Notation Node"; default: return "Unknown Node Type"; } }
<UL ID="oList"> <LI>item 1</LI> <LI>item 2</LI> <LI>item 3</LI> <LI>item 4</LI> </UL>
Figure 7-4 shows the trace output when traceNode() is called for the unordered list
Figure 7-4
Tracing a node
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The output of the traceNode() function provides a concise description of the properties of a given node For example, consider a node represented by an unordered list:
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