java barcode createTextNode() creates a DOM node representing a piece of text, commonly in Java

Generation Denso QR Bar Code in Java createTextNode() creates a DOM node representing a piece of text, commonly

createTextNode() creates a DOM node representing a piece of text, commonly
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found nested inside heading, div, paragraph, and list item tags.
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var txtNode=document.createTextNode("some text");
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The DOM standard treats text nodes as separate from those representing HTML elements. They can t have styles applied to them directly and hence take up much less memory. The text represented by a text node may, however, be styled by the DOM element containing it. Once the node, of whatever type, has been created, it must be attached to the document before it is visible in the browser window. The DOM node method appendChild() is used to accomplish this:
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el.appendChild(childEl);
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Organizing the view using the DOM
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These three methods createElement(), createTextNode(), and appendChild() give us everything that we need to add new structure to a document. Having done so, however, we will generally want to style it in a suitable way, too. Let s look at how we can do this.
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2.4.4 Adding styles to your document
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So far, we ve looked at using the DOM to manipulate the structure of a document how one element is contained by another and so on. In effect, it allows us to reshape the structures declared in the static HTML. The DOM also provides methods for programmatically modifying the style of elements and reshaping the structures defined in the stylesheets. Each element in a web page can have a variety of visual elements applied to it through DOM manipulation, such as position, height and width, colors, margins and borders. Modifying each attribute individually allows for very fine control, but it can be tedious. Fortunately, the web browser provides us with JavaScript bindings that allow us to exercise precision where needed through a low-level interface and to apply styling consistently and easily using CSS classes. Let s look at each of these in turn. The className property CSS offers a concise way of applying predefined, reusable styles to documents. When we are styling elements that we have created in code, we can also take advantage of CSS, by using a DOM node s className property. The following line, for example, applies the presentation rules defined by the declared class to a node:
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hello.className='declared';
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where hello is the reference to the DOM node. This provides an easy and compact way to assign many CSS rules at once to a node and to manage complex stylings through stylesheets. The style property In other situations, we may want to make a finer-grained change to a particular element s style, possibly supplementing styles already applied through CSS. DOM nodes also contain an associative array called style, containing all the fine details of the node s style. As figure 2.4 illustrates, DOM node styles typically contain a large number of entries. Under the hood, assigning a className to the node will modify values in the style array. The style array can be manipulated directly. After styling the items in the empty node, we draw a box around them; thus:
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empty.style.border="solid green 2px"; empty.style.width="200px";
We could just as easily have declared a box class and applied it via the className property, but this approach can be quicker and simpler in certain circumstances, and it allows for the programmatic construction of strings. If we want to freely resize elements to pixel accuracy, for example, doing so by predefining styles for every width from 1 to 800 pixels would clearly be inefficient and cumbersome. Using the above methods, then, we can create new DOM elements and style them. There s one more useful tool in our toolbox of content-manipulation techniques that takes a slightly different approach to programmatically writing a web page. We close this section with a look at the innerHTML property.
Figure 2.4 Inspecting the style attribute of a DOM node in the DOM Inspector. Most values will not be set explicitly by the user but will be assigned by the rendering engine itself. Note the scrollbar: we re seeing only roughly one-quarter of the full list of computed styles.
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