how to print barcode in asp net c# CREATING MARKUP ON THE FLY in Font

Generator Quick Response Code in Font CREATING MARKUP ON THE FLY

CHAPTER 7 CREATING MARKUP ON THE FLY
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In the test.html file, change the contents of the element identified as "testdiv" back to the original version: <div id="testdiv"> <p>This is <em>my</em> content.</p> </div> Leave the example.js file as it is. If you refresh test.html in a web browser, the result will be the same as before. The HTML contained within the testdiv element has been set by innerHTML. The HTML that was previously there has been obliterated. The innerHTML property can be quite useful when you want a quick and easy way to insert a chunk of HTML into a document. Unfortunately, innerHTML doesn t return any references to the content you insert. If you want to manipulate the inserted content, you ll need the precision offered by DOM methods. innerHTML compares favorably to document.write. Using innerHTML, you can keep your JavaScript separate from your markup. There s no need to insert <script> tags throughout your markup. Like document.write, innerHTML is HTML-specific. You won t be able to use it on any other kind of markup document. That means if you are serving up XHTML with the correct MIME type, innerHTML won t work. In any case, the standardized DOM can be used instead of innerHTML. It may take slightly more code to achieve the same results, but as you ll see, it offers more precision and power.
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Methods such as getElementById and getElementsByTagName are extremely useful for retrieving information about the structure and content of a document. The DOM is a representation of the document. The information contained in the DOM reflects the information in the document. Once you know how to ask the right questions (using the right methods), you can get the details of any node in the DOM. The DOM is a two-way street. You can query the contents of a document and you can also update the contents of a document. If you change the DOM tree, you will change the document as viewed in a browser. You ve already seen this voodoo in action with setAttribute. Using that method, you can alter an attribute node in the DOM. This change is reflected in the document displayed in the browser. You haven t physically changed the document. If you open the document in a text editor instead of a browser, you won t see a changed attribute. The changes to the document can be seen only when a browser renders the document. This is because the browser is really displaying the DOM tree. As far as the browser is concerned, the DOM tree is the document. Once you understand this, the idea of creating markup on the fly isn t quite so strange. You aren t really creating markup, you re updating the DOM. The key to doing this is to think in the same terms as the DOM. According to the DOM, a document is a tree of nodes. If you want to add to this tree, you need to insert new nodes. If you want to add markup to a document, you need to insert element nodes.
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CHAPTER 7 CREATING MARKUP ON THE FLY
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The test.html file should contain an empty <div> with the id value of "testdiv": <div id="testdiv"> </div> Now suppose you want to insert a paragraph into "testdiv". To use the language of the DOM, you want to add a p element node as a child node of the div element node (which already has one child node: an id attribute node with the value "testdiv"). This is a two-step process: Create the new element. Insert the element into the node tree.
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You can achieve the first step by using a DOM method called createElement. This is the syntax: document.createElement(nodeName) This statement will create a paragraph element: document.createElement("p"); By itself, the createElement method won t prove very useful. You ll want to insert the newly created element node into the document. To do this, you ll need to be able to refer to the newly created node. Whenever you use createElement, it s a good idea to assign the newly created element to a variable: var para = document.createElement("p"); The variable para now contains a reference to the p element you ve just created. Right now, this newly created paragraph element is floating in JavaScript limbo. The element exists, but it isn t part of the DOM node tree. This is called a document fragment. It isn t displayed in the browser. Nonetheless, it has DOM properties, just like any other node. The homeless paragraph element has a nodeType value and a nodeName value. You can test this for yourself by putting this into example.js: window.onload = function() { var para = document.createElement("p"); var info = "nodeName: "; info+= para.nodeName; info+= " nodeType: "; info+= para.nodeType; alert(info); }
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