itextsharp barcode vb net 7: Debugging DOM Applications in Java

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7: Debugging DOM Applications
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The traceObject() function performs almost the same function as traceNode(), but with generic JavaScript objects The source for the function is shown in Listing 7-5
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Listing 7-5
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The traceObject() Function
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function traceObject(oTheObj, bIncludeElemTypes, bIncludeStaticProps, bRecursiveTrace /* , cIndentLevel */) { var x; var theStr=''; var sIndentStr = ''; var typeStr=''; var i, cIndentLevel; // if the object defines a length property, trace it as array if (typeof(oTheObjlength) != "undefined") traceArray(oTheObj, true, true, bIncludeElemTypes, bRecursiveTrace); // get the indent level if it was specified if (argumentslength == 5) cIndentLevel = arguments[4]; else cIndentLevel = 1; // indent each string for (i=0; i<cIndentLevel; i++) sIndentStr += g_sIndentStr; // First list the static properties and methods if (bIncludeStaticProps) { traceString(sIndentStr + "-- Static Methods and Properties:\n"); for (x in oTheObjconstructor) { theStr = sIndentStr + "static property: " + x; typeStr = typeof(oTheObjconstructor[x]); if (bIncludeElemTypes)
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The Document Object Model: Processing Structured Documents
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theStr += " (type: " + typeStr + ")"; if (typeStr != "function") theStr += " value: " + oTheObjconstructor[x]; traceString(theStr); } traceString("\n"); } // now list the object's properties and methods traceString(sIndentStr + "-- Object Methods and Properties:\n"); for (x in oTheObj) { theStr = sIndentStr + "property: " + x; typeStr = typeof(oTheObj[x]); if (bIncludeElemTypes) theStr += " (type: " + typeStr + ")"; if (typeStr != "function") theStr += " value: " + oTheObj[x]; traceString(theStr); if (typeof(oTheObj[x]) == "object" && bRecursiveTrace) traceObject(oTheObj[x], bIncludeElemTypes, bIncludeStaticProps, bRecursiveTrace, cIndentLevel+1); } traceString("\n"); traceString(sIndentStr + "----- End of Object -----\n"); }
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The traceObject() function takes four arguments: the object to trace, the Boolean values indicating whether to show property types, whether to show static (class) properties, and whether to trace recursively The traceObject() function can also recursively trace subobjects, as traceArray() does with elements that are arrays For example, if an object defines a property that is itself an object, traceObject() can trace its properties as well The fifth argument is the current indent level; this is provided so that traceObject() can indent its output in the trace window for each subobject it encounters
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Using the Timer Functions
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When trying to find parts of your code that could use a little speed improvement, it helps to have something like a stopwatch to time how long it takes to perform certain
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7: Debugging DOM Applications
operations The TraceConsole provides a simple timer that can be used to gauge approximately how long a part of your code takes to complete You just need to bracket the code in question with the trace function to start the timer and the trace function to stop it: the console handles the rest The code for the two timer functions, startTimer() and stopTimer(), are listed here:
function startTimer() { var timeStart = new Date(); g_TimeStart = timeStartgetMilliseconds(); traceString("+-+-+ Timer Started: " + g_TimeStart + "\n"); } function stopTimer() { var timeStop = new Date(); var endTime = g_TimeStart + timeStopgetMilliseconds(); traceString("+-+-+ Timer Stopped: " + endTime + "\n"); traceString("+-+-+ Time Difference: " + (endTime-g_TimeStart) + "\n"); }
NOTE
JavaScript is an interpreted language, so a script s execution speed will depend largely on the power of the machine on which it is running and what other processes are running concurrently Because of this, the timer functions should only be used to determine an approximation of relative performance; these routines do not provide any type of specific accuracy in their measurements
For example, the following code can be used to measure how long an array operation takes:
function timerTest() { startTimer(); var arr = new Array(10); var i=0; for (i=0; i<10; i++) arr[i] = i * i; stopTimer(); }
Figure 7-5 shows the console window output when this script is run
The Document Object Model: Processing Structured Documents
Figure 7-5
Trace output from timer functions
The TraceConsole is certainly more complicated and sophisticated than using plain alert() functions; but once you start using it and become familiar with the functions, you will find it a welcome replacement for plain vanilla alerts
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