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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documentforms[0]txtBillAmtvalue=calculateBill('menuTable'); "> <!-- ( XML Code within invisible DIV tag goes here ) --> <h1>Welcome to Joe's Cafe</h1> <p>Select your entrees from the menu below To calculate the amount of the bill, click the Calculate Bill button Check the "Highlight Vegetarian meals" box to highlight vegetarian dishes</p> <table id="menuTable" width="75%" border="1"> <thead> <tr> <th colspan="3" class="Title">Joe's Cafe Menu</th> </tr> <tr> <th class="Column"> </th> <th class="Column">Item</th> <th class="Column">Price</th> </tr> </thead> <tbody> </tbody> </table> <form> <p> <input type="button" name="btnCalcBill" value="Calculate Bill" onClick="documentforms[0]txtBillAmtvalue=calculateBill('menuTable');"> Total: $<input type="text" name="txtBillAmt"> <input type="checkbox" name="cbOpts" value="isVeg" onClick="highlightVegetarian('menuTable',thischecked)"> Highlight Vegetarian Meals </p> </form> </body> </html>
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The structure of the page is pretty basic There are a couple of CSS styles to define the appearance of the menu, some text in the document to direct the user what to do, and some controls at the bottom of the page that allow the user to interact with the menu The main centerpiece of the code is the <TABLE> tag with the ID menuTable This is the element that will hold the HTML code for the menu generated from the XML The comment just below the body tag indicates where the DIV tag with the embedded XML code should go
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10: Client Processing of Data-Driven Documents
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The menu page for Joe s Cafe
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The Menu XML Code
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Listing 10-11 shows the XML code that comprises the menu for Joe s Caf Note that the XML data island is contained within an invisible <DIV> tag
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The Document Object Model: Processing Structured Documents
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Listing 10-11
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The XML Code for the Menu
<div id="xmlLayer" style="position:absolute; width:0px; height:0px; z-index:1; visibility: hidden"> <xml id="cafeMenuXML"> <cafemenu> <section name="Breakfast"> <entree> <item>Two Eggs, any style</item> <price>299</price> </entree> <entree> <item>Joe's Famous Peppers and Eggs</item> <price>629</price> </entree> <entree vegetarian="true"> <item>Bowl of fruit</item> <price>499</price> </entree> <entree vegetarian="true"> <item>French toast</item> <price>325</price> </entree> </section> <section name="Lunch"> <entree> <item>Grilled Chicken Sandwich</item> <price>599</price> </entree> <entree> <item>Tuna Melt</item> <price>499</price> </entree> <entree vegetarian="true"> <item>Pasta Salad</item> <price>539</price> </entree> </section> <section name="Dinner"> <entree> <item>New York Steak</item> <price>899</price>
10: Client Processing of Data-Driven Documents
</entree> <entree> <item>Chilean Sea Bass</item> <price>1099</price> </entree> <entree vegetarian="true"> <item>Linguini with Porcini Mushrooms</item> <price>779</price> </entree> </section> </cafemenu> </xml> </div>
This XML structure is fairly straightforward, although it s obviously a simplified example The menu is organized into sections, each delimited by a <section> tag Each <section> tag defines a set of entr es for a particular type of meal: breakfast, lunch, or dinner, which is delimited by an <entree> tag Each <entree> tag has an optional attribute, vegetarian, which indicates whether the entr e is vegetarian If no vegetarian attribute is present, then the item is assumed to be not vegetarian Each <entree> tag in a section contains child tags that describe the name of the item and its price The <item> and <price> tags each contain a single text node that describes the item name and the price for the item From this XML structure, your DOM code generates the appropriate HTML and fills out the table in the page body with the results
Generating the Menu HTML
Once the menu XML code has been embedded in the page, the HTML needs to be generated and displayed to the user There are several good methods for doing this, based upon how much control you want to have over the display of the HTML, how much coding work you want to do yourself, what kinds of special features you want to provide, and which browser you expect the user to be viewing the page in If you re using Internet Explorer as the target browser, the available options are varied: you can bind the XML directly to a table control and have the table populate automatically, you can use XPath and XSLT to transform the XML code directly into HTML, or you can use the DOM to generate the page In Netscape, you give up the data-bound controls, but you can still use the DOM and XSLT Binding the XML to an HTML table provides a direct solution in IE, but you want to provide some fairly advanced features without redesigning the XML structure of
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