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Part II
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Programming Silverlight 3 with .NET
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Look for the <div> called errorLocation on your page, and place the new <div> immediately beneath it (and above the <div> containing the <object> tag):
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<div id='mapDIV' style="position: absolute; width: 443px; height: 417px; z-index: 2; left: 301px; top: 0px"></div>
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Next, add a reference to the JavaScript libraries for Virtual Earth. You can add these anywhere in the <head> section of the page:
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<script type="text/javascript" src="http://dev.virtualearth.net/mapcontrol/mapcontrol.ashx v=6.2"></script>
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Then, write a JavaScript function that loads the Map control into the div you created. Here s the code:
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var map = null; function GetMap() { map = new VEMap('mapDIV'); map.LoadMap(); }
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This code defines a map var that will be shared across this and another JavaScript function (which you ll see in a moment). The GetMap() then creates a new VEMap object (representing a Virtual Earth map) in the div that you created earlier and loads it. Finally, call the GetMap when the page loads. Amend the <Body> tag to call GetMap by specifying its OnLoad behavior:
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<body onload="GetMap();">
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When you execute this page, you see the default map loaded in place, as shown in Figure 7-7. For the .NET code to be able to manipulate this map, you next need to add a JavaScript function that finds the required location and moves the map to that location. This function can be called from other JavaScript or .NET. Here s the function:
function MoveMap(where) { try { map.Find(null, where); } catch (e) { alert(e.message); } }
7 The Silverlight Browser Bridge
FIGURE 7-7 Integrating the Virtual Earth map.
The map var was created earlier when the Virtual Earth map was loaded. This function simply uses its Find API and passes it a string called where. As you can see, where is a parameter to this function, so if you were to call it like this:
MoveMap( London,England );
the map would move to the specified location. In the final step, look at the .NET code that implements the functionality of moving the map to the specified location when the user clicks one of the locations. The first step is to make the data points clickable. Remember that when you defined the XAML earlier you used an <ItemsControl> to host the data. The control has a <DataTemplate> template that defines how the data will appear, and this template contains a simple <TextBlock> for each control. All you have to do to make each item clickable is to make the <TextBlock> in the <DataTemplate> clickable. You can do this by wiring up its MouseLeftButtonUp event:
<ItemsControl x:Name="itmCities"> <ItemsControl.ItemTemplate> <DataTemplate> <TextBlock FontSize="14" Height="30" Text="{Binding CityName}" MouseLeftButtonUp="TextBlock_MouseLeftButtonUp" > </TextBlock> </DataTemplate>
Part II
Programming Silverlight 3 with .NET
</ItemsControl.ItemTemplate> </ItemsControl>
Now, whenever the user clicks any TextBlock, the function TextBlock_MouseLeftButtonUp fires. This function must derive the city and country, build a string containing them, and use the browser bridge to call the JavaScript MoveMap function to update the map location. First, create two strings to contain the city and country:
String strCity = ""; String strCountry = "";
Event handlers in Silverlight have an object that raises the event as their first parameter. To get the city, simply cast this to a TextBlock and take its text parameter:
TextBlock clickedText = sender as TextBlock; strCity = clickedText.Text;
The country is a little more tricky because the TextBlock containing it is added to the render tree at run time. (See the previous section for more details.) To find the country in the render tree, use this code:
TextBlock title = this.FindName("titleText") as TextBlock;
There s no guarantee that the country exists in the render tree because it is added only when a user first clicks a country button. You must check to see whether the title text is null before you derive the country from it, or else you might generate a run-time error.
if (title != null) { strCountry = title.Text; }
When you have the city and country, build a string from them:
string toFind = strCity + "," + strCountry;
Here is where the magic takes place. You must pass the string out through the browser bridge to the JavaScript function and invoke the function. With the HtmlPage collection in .NET, you can find the JavaScript function as a property of the page. Because it is script, you need to cast this into a script object. Here s the code:
ScriptObject sMoveMap = (ScriptObject)HtmlPage.Window.GetProperty("MoveMap");
Now, all that you have to do is run the script and pass it the string toFind. You can do this by using the InvokeSelf method of the ScriptObject:
sMoveMap.InvokeSelf(toFind);
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