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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Of course, there s no reason you can t use a custom sorting algorithm to accomplish the same thing this way just keeps the example simple and takes advantage of the increased performance of JavaScript engine s platform-native sorting code To do this, the code needs to store the contents of each list item in a temporary array and then call the Array class s sort() method The script first creates an array the same size as the number of <LI> tags:
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var aStrings = new Array(numItems);
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Next, the script needs to store the contents of each <LI> tag s child text node in the array so they can be sorted To do this, the script extracts the contents of the <LI> tag s child text node, creates a JavaScript String object for it, and inserts it into the array:
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for (var i=0; i < numItems; i++) { aStrings[i] = new String(listItemsitem(i)firstChilddata); }
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Performing the Sort
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Once the array has been filled with the text data, it just needs to be sorted The JavaScript Array class has a built-in method, sort(), that sorts the contents of the array It accepts one argument, which is the name of a callback function that will be used to compare the items in the array and tell the JavaScript engine which one is larger than the other JavaScript then uses this information to sort the items in the array If the function returns a number greater than 0, the first argument will sort before the second argument If the function returns a value less than 0, the second argument will sort before the first one If the function returns 0, the two items are equal The script invokes the array s sorting method by calling the sort() function:
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aStringssort(sortCallBack);
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The callback function is named sortCallBack(), and it accepts two arguments When called by the JavaScript engine, each of the two arguments will represent a string in the array The function uses the global variable gbAscending to determine whether the user has selected ascending or descending sorting, and it compares each string to determine its sort order:
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if (a < b) return gbAscending -1 : 1; else if (a > b)
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10: Client Processing of Data-Driven Documents
return gbAscending 1 : -1; else return 0;
Here, the comparison function uses the standard greater-than (<) and less-than (>) operators to compare the strings, which compares them using ASCII values The benefit of this is that you don t have to write separate code to compare strings and numbers
Replacing the Original Data with the Sorted Data
After the sort() method has compared all of the items, the contents of the array will be rearranged to reflect the new sorting All that is left to do is replace the contents of the list s <LI> tags with the newly sorted array contents The script iterates over each item in the array, creates a new text node for the string in each item, and calls replaceChild() on each <LI> tag in the list to replace the <LI> tag s existing text node (which is the firstChild) with the new one:
for (var i=0; i < numItems; i++) { var newLIText = documentcreateTextNode(aStrings[i]); listItemsitem(i)replaceChild(newLIText,listItemsitem(i)firstChild); }
Sorting a Table
A slightly more complex example involves sorting a table In this case, you want to provide the user with the ability to sort each table column in ascending and descending order by clicking a link in the top row of each column, just as they would in a web page that used server-side sorting To illustrate, let s take the same document as in the list sorting example, modified by adding prices to each of the items on the shopping list and displaying it as a table, as shown in Figure 10-3 Here, the user has the option to sort either column in ascending or descending order by clicking one of the links in the table header The source HTML for this document is shown in Listing 10-3:
Listing 10-3
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