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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the code In addition, Netscape doesn t directly support data-bound controls, although you could write some custom JavaScript to get it to behave properly and work acceptably Still, this would be a daunting task, and if you re going to write JavaScript code to get it to work in one browser, you might as well use JavaScript for the entire solution Therefore, for the requirements in this example, data-bound controls are out Using XSLT to transform the XML into displayable HTML would be a straightforward, elegant solution because that s what it is designed to do XSLT is a standard also defined by the W3C that describes how to transform XML documents into other types of documents, such as XML, HTML, PDF, text, and so on It works by applying templates to sections of the source XML file to produce the output file The XSLT support provided by Internet Explorer and Netscape would be enough to perform the necessary transformation of the sample document if it were a stand-alone XML file that was being displayed by a browser In addition, IE provides native XSLT transform support for individual document nodes via the transformNode() method, but Netscape lacks this feature as of version 622, so it won t work for the embedded XML data island example In addition, you ll want more control over the generation of your document during processing than XSLT might allow Because a full introduction to XSLT is beyond our scope, for now we ll put it aside That leaves using the DOM to directly manipulate the XML content, which will work in both Netscape and IE because both provide excellent support the DOM You also can be sure that it will continue to work down the road as new DOM-compliant browsers are introduced because you re using an API that is independent of any particular vendor s implementation Listing 10-12 lists the JavaScript code that creates and handles the menu
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Listing 10-12
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JavaScript for Generating the Menu
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var gEntreeCount = 0; function initialize(idTheTable,idXMLData) { var oTheTable = documentgetElementById(idTheTable); // if the table already has a TBODY, remove it var theTBODY = oTheTablegetElementsByTagName('TBODY'); if (theTBODYlength > 0) oTheTableremoveChild(theTBODY[0]); // now create the menu content theTBODY = generateMenuContent(idXMLData); // and add it to the table
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10: Client Processing of Data-Driven Documents
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oTheTableappendChild(theTBODY); } function generateMenuContent(idXMLData) { var i=0,j=0; var theTBODYNode = documentcreateElement('TBODY'); var oXMLDoc = documentgetElementById(idXMLData); var aMenuSections = oXMLDocgetElementsByTagName('section'); for (i=0; i < aMenuSectionslength; i++) { // each <section> tag starts a new Menu section, so create // a table row for the section with the value of the // section's 'name' attribute var sName = aMenuSectionsitem(i)getAttribute('name'); var oTR = documentcreateElement('TR'); var oTD = documentcreateElement('TD'); oTDsetAttribute('colspan','3'); oTDappendChild(documentcreateTextNode(sName)); oTRappendChild(oTD); theTBODYNodeappendChild(oTR); // now create each menu item The child nodes of each // <section> tag represent an individual entree var aEntrees = aMenuSectionsitem(i)getElementsByTagName('entree'); for (j=0; j < aEntreeslength; j++) { oTR = documentcreateElement('TR'); // create a custom attribute on the TR tag called "vegetarian" // to indicate whether the item is vegetarian or not This // will save us a lot of effort later when we're trying to // highlight the vegetarian items if (aEntreesitem(j)getAttribute("vegetarian")) oTRsetAttribute("vegetarian", aEntreesitem(j)getAttribute("vegetarian") ); // 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');
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The Document Object Model: Processing Structured Documents
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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 = aEntreesitem(j)getElementsByTagName('price')[0]; // just copy the price node's text child to the TD oTDappendChild( documentcreateTextNode(oPriceNodefirstChilddata)); oTRappendChild(oTD); // add the row to the table body theTBODYNodeappendChild(oTR); } } return theTBODYNode; } function calculateBill(idMenuTable) { var fBillTotal = 00; var i=0; var oTable = documentgetElementById(idMenuTable); // go through the table and add up the prices of all // the selected items The code takes advantage of the // fact that each checkbox has a corresponding row in // the table, and the only INPUT tags are the checkboxes var aCBTags = oTablegetElementsByTagName('INPUT'); for (i=0; i < aCBTagslength; i++) { if (aCBTags[i]checked) { // get the checkbox' parent TR var oTR = getParentTag(aCBTags[i],'TR'); // retrieve the price from the TD var oTDPrice = oTRgetElementsByTagName('TD')[2]; // the child text node contains the price
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