Bootstrap JavaScript file ( bootstrap.js) which instantiates the Widget.Web page ( testpage.html) where the Widget is hosted.Here are the parts of the widget as shown in Figure 5.3.
The Hello World Widget will display ‘ Hello World’ along with the image of the widget in the viewable area of the widget. Open your favorite HTML editor and let’s get started.įigure 5.2 Developing the Hello World Widget In the section, we will create a widget which takes the JSON data coming from the server and parses and displays it in the Widget as Hello World.
Images and Style: Presentation of the Widget.JavaScript: The main functionality of parsing and displaying data.HTML: The page which hosts the widget and passes the parameter to the Widget.Data: The data of the widget, coming from data.js.The architecture of a widget can be divided into three parts as shown in Figure 5.2. Let’s now see the Hello World Widget architecture.
Although having JSON data gives modularity to the approach.
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The important point here is that the data.js file can be dynamically created on the server side, here it is JSON data but it can also be dynamically created series of JavaScript document.write lines which renders HTML directly. And when the JavaScript file is loaded, the function is called and the JSON data is then parsed and displayed using Document.Write. The ParseData function will be in another JavaScript file, say myWidget.js file. The actual JSON data can be an array of any number of key value pairs which follows the JavaScript object notation. Var jsondata = data // since the JSON data is an array document.write(jsondata.text)
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When you click on the ‘ Hello World’ text, it redirects to a website, which is also passed as a parameter from the page.Ĭopy Code // function which accepts JSON data The Widget takes two parameters with values ‘ Hello’ and ‘ World’, one is passed from the test page where it is hosted and the other comes from the data which is hosted in the server, joins them and display it together along with the image as shown in Figure 5.1. Hello World Widgetīefore diving into developing the widget, let’s see what it does. We will use Microsoft’s Visual Web Developer Express (free) edition for developing the Widget, but you can use your favorite Integrated Development Environment (IDE). This chapter first shows the different components of the Hello World widget, and then takes in a step by step process, to develop it.
In the next section, we will create a more advanced widget and you will learn all aspects of it, like customization,security and performance as in the real world scenario. If you are a beginner, I would suggest you to do this chapter along with me, and get a good grasp of all the aspects of the web widget. This chapter gives you a good starting point to understand the development of a web widget. In this chapter, we will create a basic Hello World Widget using HTML, CSS, and JavaScript.
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