tailieunhanh - Dojo Using the Dojo JavaScript Library to Build Ajax Applications phần 3

Để tốt hơn hoặc tồi tệ hơn, Webusera thông tin thao tác viewvisual có presis vừa mạnh mẽ. Một trang web là một bộ sưu tập của các yếu tố trực quan cho phép và entation phù hợp với các phụ tùng quyền đúng dữ liệu. Nói cách khác, thông tin những tiếng kêu gào để được hiển thị trong hình thức chính xác. | 4 Using Dojo Widgets There is nothing worse than a sharp image of a fuzzy concept. Ansel Adams For better or worse the Web is a strong visual medium. A web page is a collection of visual elements that allow the user to view and manipulate information whose best presentation fits the right widget to the right data. In other words the information cries out to be displayed in the correct form. Unfortunately standard HTML only provides a small set of options for displaying data. Dojo expands our possibilities by providing a robust set of visual elements called widgets which offers us a much richer palette to choose from for bringing the data and features of our applications to life. Adding Dojo Widgets to the Page Web developers are looking for ways to apply Ajax techniques to their web pages. But what exactly is Ajax The original acronym was capitalized as AJAX and stood for Asynchronous JavaScript and XML. But the meaning has evolved over time. Let me give you a more current meaning. Ajax can be described as a two-sided coin. One side of the coin is the ability to communicate with the server asynchronously without refreshing the page also known as the XHR object. This in many ways is the essential feature of an Ajax web site because this is the new paradigm on which many Web interfaces are other side of the Ajax coin is the rich user interface that most Ajax applications provide. To many this is the real hallmark of an Ajax application regardless of how server requests are made under the hood. A JavaScript library might address either side of this coin but Dojo addresses ve already covered the XHR object so in this part of the tutorial we focus on the ability of Dojo to provide the rich user interface through its set of advanced widgets. 52 Chapter 4 Using Dojo Widgets Dijit The Dojo Widget Module Dojo uses the term dijit to describe its features related to creating and using widgets. Not only is this a conceptual term but Dojo also .

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