java qr code generator maven First steps with Ajax in Java

Create QR-Code in Java First steps with Ajax

First steps with Ajax
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The background property of the icon styles is set to not repeat itself and be positioned at the top left of the element, with transparency enabled. (Figure 2.2 is rendered using Firefox. Transparency of .png images under Internet Explorer is buggy, with a number of imperfect proposed workarounds available. The forthcoming Internet Explorer 7 fixes these bugs, apparently. If you need crossbrowser transparent images, we suggest the use of .gif images at present.) Individual items declare two style classes: The generic item defines their layout in the container, and a second, more specific one defines the icon to be used. For example:
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<div class='item folder'> <div class='itemName'>stuff</div> </div> <div class='item file'> <div class='itemName'>shopping list</div> </div>
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All the images in the styling are applied as background images using CSS. The titlebar is styled using an image as tall as the bar and only 1 pixel wide, repeating itself horizontally:
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div.titlebar{ background-color: #0066aa; background-image: url(images/titlebar_bg.png); background-repeat: repeat-x; ... }
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The full HTML for this widget is presented in listing 2.1.
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Listing 2.1 window.html
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<html> <head> <link rel='stylesheet' type='text/css' Link to href='window.css' /> stylesheet </head> <body> Top-level window element <div class='window'> <div class='titlebar'> <span class='titleButton' id='close'></span> <span class='titleButton' id='max'></span> <span class='titleButton' id='min'></span> </div> <div class='contents'> <div class='item folder'> <div class='itemName'>Documents</div> </div> <div class='item folder'>
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Titlebar buttons
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Defining look and feel using CSS
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<div class='itemName'>lost and found</div> </div> <div class='item folder'> An icon <div class='itemName'>stuff</div> inside a </div> window <div class='item file'> <div class='itemName'>shopping list</div> </div> <div class='item file'> <div class='itemName'>things.txt</div> </div> <div class='item special'> <div class='itemName'>faves</div> </div> <div class='item file'> <div class='itemName'>chapter 2</div> </div> </div> </div> </body> </html>
The HTML markup defines the structure of the document, not the look. It also defines points in the document through which the look can be applied, such as class names, unique IDs, and even the tag types themselves. Reading the HTML, we can see how each element relates to the other in terms of containment but not the eventual visual style. Editing the stylesheet can change the look of this document considerably while retaining the structure, as figure 2.2 has demonstrated. The complete stylesheet for the widget is shown in listing 2.2.
Listing 2.2 window.css
div.window{ position: absolute; overflow: auto; background-color: #eeefff; border: solid #0066aa 2px; margin: 8px; padding: 0px; Geometry width: 420px; of element height: 280px; } div.titlebar{ background-color: #0066aa; background-image: url(images/titlebar_bg.png); background-repeat: repeat-x;
Background texture
First steps with Ajax
color:white; border-bottom: solid black 1px; width: 100%; height: 16px; overflow:hidden; } span.titleButton{ position: relative; height: 16px; width: 16px; padding: 0px; margin: 0px 1px; 0px 1px; float:right; Flow layout } span.titleButton#min{ background: transparent url(images/min.png) top left no-repeat; } span.titleButton#max{ background: transparent url(images/max.png) top left no-repeat; } span.titleButton#close{ background: transparent url(images/close.png) top left no-repeat; } div.contents { background-color: #e0e4e8; overflow: auto; padding: 2px; height:240px; } div.item{ position : relative; height : 64px; width: 56px; float: left; color : #004488; font-size: 18; padding: 0px; margin: 4px; } div.item div.itemName { Text placement margin-top: 48px; font: 10px verdana, arial, helvetica; text-align: center; } div.folder{ background: transparent url(images/folder.png) top left no-repeat; }
Organizing the view using the DOM
div.file{ background: transparent url(images/file.png) top left no-repeat; } div.special{ background: transparent url(images/folder_important.png) top left no-repeat; }
We ve already looked at a number of the tricks that we ve employed in this stylesheet to tune the look and feel of individual elements. We ve highlighted a few more here, to demonstrate the breadth of concerns to which CSS can be applied: on-screen placement b, texturing elements c, assisting in layout of elements d, and placing text relative to accompanying graphics e. CSS is an important part of the web developer s basic toolkit. As we ve demonstrated here, it can be applied just as easily to the types of interfaces that an Ajax application requires as to the more design-oriented approach of a static brochure-style site.
2.4 Organizing the view using the DOM
The Document Object Model (DOM) exposes a document (a web page) to the JavaScript engine. Using the DOM, the document structure, as seen in figure 2.3, can be manipulated programmatically. This is a particularly useful ability to have at our disposal when writing an Ajax application. In a classic web application, we are regularly refreshing the entire page with new streams of HTML from the server, and we can redefine the interface largely through serving up new HTML. In an Ajax application, the majority of changes to the user interface will be made using the DOM. HTML tags in a web page are organized in a tree structure. The root of the tree is the <HTML> tag, which represents the document. Within this, the <BODY> tag, which represents the document body, is the root of the visible document structure. Inside the body, we find table, paragraph, list, and other tag types, possibly with other tags inside them. A DOM representation of a web page is also structured as a tree, composed of elements or nodes, which may contain child nodes within them, and so on recursively. The JavaScript engine exposes the root node of the current web page through the global variable document, which serves as the starting point for all our DOM manipulations. The DOM element is well defined by the W3C specification.
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