| author | tasneems@symbian.org |
| Thu, 04 Mar 2010 15:42:37 -0800 | |
| changeset 220 | 41890dfa56f5 |
| permissions | -rw-r--r-- |
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<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
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<html lang="en" xml:lang="en"> |
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<head> |
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<meta content="text/html; charset=utf-8" http-equiv="Content-Type" /> |
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<meta name="copyright" content="(C) Copyright 2005" /> |
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<meta name="DC.rights.owner" content="(C) Copyright 2005" /> |
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<meta content="concept" name="DC.Type" /> |
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<meta name="DC.Title" content="Planning the widget" /> |
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<meta scheme="URI" name="DC.Relation" content="WRTKit_Travel_Companion_Tutorial-GUID-be79ba64-fa03-4968-964e-d7dcc42d7053.html" /> |
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<meta content="XHTML" name="DC.Format" /> |
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<meta content="GUID-891068C7-C802-4DA7-8674-8E8292AEF7EB" name="DC.Identifier" /> |
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<meta content="en" name="DC.Language" /> |
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<link href="commonltr.css" type="text/css" rel="stylesheet" /> |
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<title> |
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Planning the widget</title> |
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</head> |
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<body id="GUID-891068C7-C802-4DA7-8674-8E8292AEF7EB"><a name="GUID-891068C7-C802-4DA7-8674-8E8292AEF7EB"><!-- --></a> |
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<h1 class="topictitle1"> |
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Planning the widget</h1> |
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<div> |
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<div class="section"><h2 class="sectiontitle"> |
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Designing the user interface</h2> |
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<p> |
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Because the Travel Companion is such a complex widget it is important to plan |
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both the user interface and implementation carefully before starting to write |
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any code. What are the most common use cases that we want to address with this |
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widget? How will typical users be using the widget? What kind of future features |
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might there be and can we plan for those already? |
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</p> |
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<p> |
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Because the Travel Companion widget offers so much functionality and information |
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it is important to present it in such a way that it doesn't overwhelm the user. |
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To give the user a better idea of what is available and how to get to everything, |
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we'll have a main view with nothing but navigation buttons to the other views in |
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the widget. We'll implement this view using WRTKit NavigationButton controls and |
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we will give each button its own icon so that the user can quickly see what the |
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view is about. |
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</p> |
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<p> |
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After some planning and talking to potential users we have decided to create |
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a summary view that we will call "information view". This view will include the |
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most important information in a single place so that the user can view it quickly |
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without having to press any buttons to navigate around the widget. We'll put a |
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world clock here, the current weather at home and at the local destination, and |
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the latest news headlines. The information view will be entirely composed from |
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WRTKit ContentPanel controls. |
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</p> |
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<p> |
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In addition to the information view we'll have two more specialized views. We'll |
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have a currency converter with two TextField controls (one for the home currency |
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and one for the local) and two FormButton controls. One button will convert |
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from the home currency to local currency and the other button will convert in the |
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other direction. The second specialized view is a five day weather forecast. Like |
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the information view this will be using ContentPanel controls and we will share |
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the weather content used for the information view for this view. |
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</p> |
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<p> |
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Finally we'll have a settings view that is accessible from the main view just like |
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the other views in the widget. In many other widgets we might want to hide access |
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to the settings view to the Options menu but in this case one of the common use |
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cases is to configure where in the world you are so rather than hiding access to |
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the view we want to present it clearly in the main view. The settings view will |
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use SelectionMenu controls to allow users to select their home and local cities, |
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SelectionList controls with a single option that will be presented as a checkbox |
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to configure whether the cities are in daylight saving time or not, and a |
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SelectionList control that lets the user select the temperature unit to use in |
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the weather forecasts. Finally there will be two FormButton controls to let the |
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user save or cancel any settings changes. |
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</p> |
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<p> |
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When the widget starts will setup a timer that will call a timer callback function |
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once every second. In the callback function we will check what view is currently |
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active and we'll update the views (e.g. clock) so that the views stays up to date |
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even if the user doesn't do anything. After all, the most common use case is to |
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just have the information view open and not do anything other than glance at the |
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information that is displayed. |
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</p> |
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</div> |
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<div class="section"><h2 class="sectiontitle"> |
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Travel Companion widget files</h2> |
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<p> |
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All the files - HTML, CSS, JavaScript and images - have been created for you. |
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You can find the completed widget with all its files in the Examples/TravelCompanion |
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directory in the WRTKit SDK. The tutorial will assume that you will create your |
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own Travel Companion widget by following the instructions but if you prefer you can |
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just open up the ready made files and examine them as you read the tutorial. If you |
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are creating the widget from scratch by following the tutorial's instructions then |
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we suggest that you create a working directory for the new widget and copy over all |
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other ready made files except TravelCompanion.js. All of our work will be on this |
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file, but before we move on to that file we'll take a look at what other files the |
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widget is using. |
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</p> |
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<p> |
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Since we're using the WRTKit to implement our user interface we have the WRTKit |
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library with all its files in a directory called "WRTKit". |
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</p> |
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<p> |
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Like all widgets the Travel Companion has an Info.plist widget metadata file and an |
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icon in a file called Icon.png. You'll also notice that there's a bunch of png |
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image files in the widget directory. There's a file called ListViewCaptionLogo.png |
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that we will use as a custom graphical element in the view caption in all of our |
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views. Four png files have names starting with "Nav" and the rest start with |
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"Weather". The image files that have names starting with "Nav" are icons for the |
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NavigationButton controls for the main view. They are simply images that are |
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30 by 30 pixels in size and have some graphical motif that captures what the button |
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does. Note that the size of images used for navigation buttons doesn't have to be |
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exactly 30 by 30 pixels - you can use any size you like. The images with names |
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starting with "Weather" are images used in the weather forecasts. There is one image |
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for each kind of weather that can be forecasted: rain, snow, sunshine, clouds, etc. |
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</p> |
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<p> |
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You'll find two JavaScript files: Engine.js and TravelCompanion.js. The Engine.js |
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file has the implementation of the business logic and the TravelCompanion.js file |
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implements the widget and its user interface. Finally there is the main widget HTML |
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file called TravelCompanion.html and a CSS file called TravelCompanion.css that |
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contains all the style rules used in the widget - above that what the WRTKit defines |
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by default, which is actually nearly everything! |
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</p> |
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<p> |
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150 |
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Let's take a quick peek at TravelCompanion.html: |
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</p> |
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153 |
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<pre> |
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155 |
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<?xml version="1.0" encoding="UTF-8"?> |
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> |
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<html xmlns="http://www.w3.org/1999/xhtml"> |
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<head> |
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<title></title> |
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<script type="text/javascript" src="WRTKit/WRTKit.js"></script> |
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<script type="text/javascript" src="Engine.js"></script> |
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<script type="text/javascript" src="TravelCompanion.js"></script> |
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<style type="text/css"> |
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@import url("TravelCompanion.css");
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</style> |
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</head> |
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<body onload="init()"> |
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</body> |
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</html> |
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</pre> |
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172 |
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<p> |
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174 |
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If you've gone through the Hello World and/or RSS Reader tutorials then this should |
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look very familiar. The file has no content, includes the WRTKit.js file from the |
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WRTKit library directory, includes the JavaScript files that we are using to implement |
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the Travel Companion widget, includes the TravelCompanion.css stylesheet file, and |
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finally calls a function called init() when the widget has loaded everything. |
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</p> |
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181 |
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</div> |
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183 |
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<div class="section"><h2 class="sectiontitle"> |
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The Travel Companion Engine</h2> |
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186 |
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187 |
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<p> |
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189 |
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Following good software engineering principles, we are implementing the Travel Companion |
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191 |
widget so that the user interface is decoupled from the implementation of the actual |
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192 |
business logic that knows weather forecasts, calculates currency conversions, etc. The |
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logic is outside of the scope for this tutorial since we're interested in learning about |
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how to use the WRTKit - not how to convert euros to dollars. Because of this we will not |
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look at all at how the business logic is implemented but we will take a close look at |
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the interface between the user interface and the business logic engine. In fact, the |
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implementation of the engine for this example is a mock implementation and only mimics |
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what a real engine would do. But since this is only an example that's quite alright. |
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The engine interface, however, is identical to what it would be even if the engine would |
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have a real implementation. |
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</p> |
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202 |
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<p> |
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204 |
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The engine is implemented as a JavaScript class that you instantiate before using. |
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The reason for being implemented as a class is simply so that the engine can better |
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encapsulate its internal data and provide a kind of name space for its methods. |
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</p> |
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209 |
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<p> |
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211 |
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The core concept in the Travel Companion engine is that of cities. The engine supports |
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a list of cities and one will always be a "home city" and one a "local city". The |
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same city can be both home and local. Home refers to the city where the user lives |
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and local refers to the city where the user is currently located. The engine doesn't |
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know the daylight saving time schedules for cities so this is configured manually by |
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the user: one setting for the home city and one for the local city. The engine handles |
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all preferences but the user interface must tell it to save preferences if some |
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preference is modified. Preferences are automatically loaded when the engine is |
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created, which should happen when the widget starts so that all the settings are |
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available immediately. |
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</p> |
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223 |
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<p> |
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225 |
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A city in the engine is a JavaScript object. A city object has the following public |
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properties: name for the city name, currency for the three-letter currency abbreviation, |
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and timezone for the timezone code (e.g. GMT). Cities are created and managed entirely |
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by the engine. |
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</p> |
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231 |
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<p> |
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233 |
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Below is a complete list of the public engine APIs that are related to preferences and |
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cities: |
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</p> |
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237 |
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<p> |
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Loading and saving preferences: |
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</p> |
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<pre> |
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[void] Engine.loadPreferences(void) |
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[void] Engine.savePreferences(void) |
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</pre> |
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<p> |
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Retrieving all cities supported by the engine: |
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</p> |
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<pre> |
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[Array] Engine.getCities(void) |
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</pre> |
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<p> |
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Retrieving a city based on its name: |
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</p> |
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<pre> |
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[City] Engine.getCityByName(String name) |
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</pre> |
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<p> |
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Retrieving and settting the home city: |
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</p> |
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<pre> |
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[City] Engine.getHomeCity(void) |
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[void] Engine.setHomeCity(City city) |
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</pre> |
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<p> |
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Retrieving and settting the home city daylight saving time setting: |
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</p> |
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<pre> |
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[Boolean] Engine.getHomeCityDST(void) |
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[void] Engine.setHomeCityDST(Boolean dst) |
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</pre> |
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<p> |
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Retrieving and settting the local city: |
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</p> |
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<pre> |
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[City] Engine.getLocalCity(void) |
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[void] Engine.setLocalCity(City city) |
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</pre> |
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<p> |
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Retrieving and settting the local city daylight saving time setting: |
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</p> |
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<pre> |
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[Boolean] Engine.getLocalCityDST(void) |
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[void] Engine.setLocalCityDST(Boolean dst) |
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</pre> |
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<p> |
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314 |
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315 |
Retrieving and setting the preferred temperature unit: |
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316 |
</p> |
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317 |
|
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<pre> |
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319 |
|
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[String] Engine.getTemperatureUnit(void) |
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321 |
[void] Engine.setTemperatureUnit(String unit) |
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322 |
</pre> |
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323 |
|
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<p> |
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325 |
|
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|
326 |
Of course the engine isn't just about preferences. Its actual purpose is to perform |
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327 |
various operations related to these cities, such as converting currencies, figuring |
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|
328 |
out what the time is in a foreign city, etc. To simplify the usage of the engine, |
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the public methods related to these operations are defined in terms of the home and |
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|
330 |
local city as it is configured at the time when the method is called. |
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331 |
</p> |
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|
332 |
|
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|
333 |
<p> |
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|
334 |
|
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|
335 |
Here's the full list of the actual operation methods that the engine supports: |
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|
336 |
</p> |
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|
337 |
|
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|
338 |
<p> |
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|
339 |
|
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|
340 |
Currency conversions between home and local: |
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|
341 |
</p> |
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|
342 |
|
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|
343 |
<pre> |
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|
344 |
|
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|
345 |
[Float] Engine.convertHomeToLocalMoney(Float amount) |
|
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|
346 |
[Float] Engine.convertLocalToHomeMoney(Float amount) |
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|
347 |
</pre> |
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|
348 |
|
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|
349 |
<p> |
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|
350 |
|
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|
351 |
Retrieving the current time in the home and local cities: |
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|
352 |
</p> |
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|
353 |
|
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|
354 |
<pre> |
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|
355 |
|
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|
356 |
[DateTime] Engine.getHomeTime(void) |
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|
357 |
[DateTime] Engine.getLocalTime(void) |
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|
358 |
</pre> |
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|
359 |
|
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|
360 |
<p> |
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|
361 |
|
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|
362 |
The DateTime object returned by getHomeTime() and getLocalTime() is a JavaScript |
|
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|
363 |
object that contains the following properties: year, month, date, day, hours, minutes, |
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|
364 |
seconds, timezone. All properties are integers except the timezone, which is a string |
|
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|
365 |
that represents the timezone code, e.g. "EET" for "Eastern European Time". Month and |
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|
366 |
day are zero-based to simplify their use as indexes in arrays that contains the month |
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|
367 |
and week day names. These arrays can be found in the DateTime object. The array for |
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|
368 |
week day names is called dayNames and the array for month names is called monthNames. |
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369 |
Day 0 is Sunday and month 0 is January. To find out the name of the day represented |
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|
370 |
by a DateTime object you would do the following: |
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|
371 |
</p> |
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|
372 |
|
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|
373 |
<pre> |
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|
374 |
|
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|
375 |
var homeTime = engine.getHomeTime(); |
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|
376 |
var dayOfWeekName = homeTime.dayNames[homeTime.day]; |
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|
377 |
</pre> |
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|
378 |
|
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|
379 |
<p> |
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|
380 |
|
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|
381 |
Note that the default JavaScript Date object is not used because of its timezone- |
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|
382 |
related limitations. |
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|
383 |
</p> |
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|
384 |
|
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|
385 |
<p> |
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|
386 |
|
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|
387 |
Retrieving 5-day forecasts for the home and local cities: |
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|
388 |
</p> |
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|
389 |
|
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|
390 |
<pre> |
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|
391 |
|
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|
392 |
[Array] Engine.getHomeWeather(void) |
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|
393 |
[Array] Engine.getLocalWeather(void) |
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|
394 |
</pre> |
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|
395 |
|
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|
396 |
<p> |
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|
397 |
|
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|
398 |
The array returned by the getHomeWeather() and getLocalWeather() methods contains |
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|
399 |
the weather for the next five days so that the first element is the weather today, |
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|
400 |
the second is the weather tomorrow, etc. Each item is a JavaScript object that |
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|
401 |
has two properties: temperature, which is an integer in the preferred temperature |
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|
402 |
unit, and type, which is a string that describes the weather. The type string is |
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|
403 |
one of the following: "Sunny", "PartlyCloudy", "Cloudy", "Rain", "Sleet" or Snow". |
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|
404 |
There is a weather type image for each of these, named so that there is a "Weather" |
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|
405 |
prefix in front of the weather type and a ".png" suffix after it, e.g. "WeatherSunny.png". |
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|
406 |
</p> |
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|
407 |
|
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|
408 |
<p> |
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|
409 |
|
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|
410 |
Retrieving an array of the latest news headlines: |
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|
411 |
</p> |
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|
412 |
|
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|
413 |
<pre> |
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|
414 |
|
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|
415 |
[Array] Engine.getNewsHeadlines(void) |
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|
416 |
</pre> |
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|
417 |
|
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|
418 |
<p> |
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|
419 |
|
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|
420 |
Each item in the array that the getNewsHeadlines() method returns is a JavaScript |
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|
421 |
object that describes one news headline. Each news headline object has two |
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|
422 |
properties: headline for the actual news headline text and url for the website |
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|
423 |
address where the full news article is located. |
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|
424 |
</p> |
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|
425 |
|
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|
426 |
</div> |
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|
427 |
|
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|
428 |
</div> |
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|
429 |
|
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|
430 |
<div> |
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|
431 |
<div class="familylinks"> |
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|
432 |
<div class="parentlink"><strong>Parent topic:</strong> <a href="WRTKit_Travel_Companion_Tutorial-GUID-be79ba64-fa03-4968-964e-d7dcc42d7053.html">Travel Companion</a></div> |
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|
433 |
</div> |
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|
434 |
</div> |
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|
435 |
|
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|
436 |
</body> |
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|
437 |
</html> |