itextsharp barcode vb net 10: Client Processing of Data-Driven Documents in Java

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10: Client Processing of Data-Driven Documents
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fBillTotal += parseFloat(oTDPricefirstChilddata); } } return Mathround(fBillTotal*1000)/1000; } function highlightVegetarian(idTable,bShowVeg) { // if bShowVeg is true, then we're highlighting vegetarian // meals, otherwise we're unhighlighting them var i=0; var oTable = documentgetElementById(idTable); // start by getting all of the TR elements in the TBODY var oTBODY = oTablegetElementsByTagName('TBODY')[0]; var aTRs = oTBODYgetElementsByTagName('TR'); for (i=0; i < aTRslength; i++) { if (aTRs[i]getAttribute('vegetarian')) { if (bShowVeg) aTRs[i]stylebackgroundColor = "lightGreen"; else aTRs[i]stylebackgroundColor = ""; } } } function getParentTag(oNode, sParentType) { var oParent = oNodeparentNode; while (oParent) { if (oParentnodeName == sParentType) return oParent; oParent = oParentparentNode; } return oParent; }
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Initializing the Page
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The menu page s <BODY> tag contains an onLoad event handler that handles the details of the page initialization:
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<body bgcolor="#FFFFFF" text="#000000" onLoad="initialize('menuTable','cafeMenuXML'); documentforms[0]txtBillAmtvalue=calculateBill('menuTable'); ">
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The Document Object Model: Processing Structured Documents
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The initialize() function takes two arguments: the ID of the table that will hold the menu and the ID of the XML data island that will be used to generate the HTML The function begins by locating the table represented by the given ID:
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function initialize(idTheTable,idXMLData) { var oTheTable = documentgetElementById(idTheTable);
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Next, the code removes any existing TBODY that it finds from the table This will make it easier to add a new one later on
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// if the table already has a TBODY, remove it var theTBODY = oTheTablegetElementsByTagName('TBODY'); if (theTBODYlength > 0) oTheTableremoveChild(theTBODY[0]);
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Once the table is ready for the HTML code, the generateMenuContent() function is called with the ID of the XML data island This function returns a TBODY node populated with rows and columns representing the XML data for the menu:
// now create the menu content theTBODY = generateMenuContent(idXMLData);
Now, the new TBODY node is appended to the table element using the appendChild() method:
// and add it to the table oTheTableappendChild(theTBODY); }
Building the Table
The generateMenuContent() function is the workhorse of the menu page This function is responsible for transforming the HTML code into a fully formed TBODY node with all of the child nodes in place to represent each section, item, and price in the menu XML code The generateMenuContent() function begins by creating a new TBODY element, which will hold the resulting <TR> and <TD> tags for the generated menu:
function generateMenuContent(idXMLData) { var i=0,j=0; var theTBODYNode = documentcreateElement('TBODY');
10: Client Processing of Data-Driven Documents
Once the TBODY is created, the function locates the XML data island represented by the idXMLData argument:
var oXMLDoc = documentgetElementById(idXMLData);
Next, the list of <SECTION> tags is generated The function loops over each section tag in the XML structure and processes all of the child <ENTREE> tags:
var aMenuSections = oXMLDocgetElementsByTagName('section'); for (i=0; i < aMenuSectionslength; i++) {
Each section tag corresponds to a table row that contains the name of the menu section:
var sName = aMenuSectionsitem(i)getAttribute('name'); var oTR = documentcreateElement('TR'); var oTD = documentcreateElement('TD'); oTDsetAttribute('colspan','3'); oTDappendChild(documentcreateTextNode(sName)); oTRappendChild(oTD); theTBODYNodeappendChild(oTR);
Once the row for the section name is created, the rows for the entr es in the section need to be created and added to the table body The function gets the list of <ENTREE> tags and loops over each one, processing the <ITEM> and <PRICE> tags:
var aEntrees = aMenuSectionsitem(i)getElementsByTagName('entree'); for (j=0; j < aEntreeslength; j++) {
Each <ENTREE> tag corresponds to its own table row, so a new <TR> tag is created for the entr e:
oTR = documentcreateElement('TR');
If the entr e is vegetarian, you create a vegetarian attribute for the table row so it will be easier to find later Both IE and Netscape allow you to attach customdefined attributes to a tag using the setAttribute() DOM method
The Document Object Model: Processing Structured Documents
NOTE
In IE, you can also set custom attributes in JavaScript by using the name of the attribute on the object, for example, oTRvegetarian="true" This doesn t work in Netscape for some reason instead, you need to use setAttribute()
if (aEntreesitem(j)getAttribute("vegetarian")) oTRsetAttribute("vegetarian", aEntreesitem(j)getAttribute("vegetarian") );
Now the function creates the contents of each table row The row contains three columns: a check box that allows the user to select the menu item, the name of the entr e, and its price
// create the TD for the checkbox oTD = documentcreateElement('TD'); oTDsetAttribute('align','center'); var oCB = documentcreateElement('INPUT'); oCBsetAttribute('name','item'+gEntreeCount++); oCBsetAttribute('type','checkbox'); oTDappendChild(oCB); oTRappendChild(oTD); // create the TD for the item name oTD = documentcreateElement('TD'); var oItemNode = aEntreesitem(j)getElementsByTagName('item')[0]; // just copy the item node's text child to the TD oTDappendChild( documentcreateTextNode(oItemNodefirstChilddata) ); oTRappendChild(oTD); // create the TD for the price oTD = documentcreateElement('TD'); // align the prices to the right so they line up // over the decimal point oTDsetAttribute('align','right'); var oPriceNode =
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