upc internet 200+ Figure 17-4 Different random text messages load without reloading the page in .NET

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Figure 17-4 Different random text messages load without reloading the page
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17: ASPNET Ajax NOTE
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By default, you must have only one ScriptManager but you may need to add a proxy object (ScriptManagerProxy control) to ensure that the code, perhaps inside of a set of nested master pages, has the ScriptManager object present to execute properly
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Using Events with Ajax
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Up to this point, all of the event-generating controls have been within the UpdatePanel control If you call any events based on controls outside of the UpdatePanel, the whole page is reloaded unless you take certain steps to prevent that from happening You may wonder, why place controls outside of the UpdatePanel container if they are to be used for working with events inside the UpdatePanel container You may be working with an existing site that originally did not have Ajax functionality Instead of moving the different controls inside the UpdatePanel container, you just want their events to have an effect on the UpdatePanel controls
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Triggers
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Fortunately, the solution for using Ajax with control events outside the UpdatePanel container is relatively simple You can use the <Triggers> tag and the AsyncPostBackTrigger object to listen to the events of controls outside of the UpdatePanel container The following shows the relevant code structure:
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<Triggers> <asp:AsyncPostBackTrigger ControlID="ControlName" EventName="EventName" /> </Triggers>
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By default, the trigger container goes inside the UpdatePanel container but outside of the <ContentTemplate> container You can enter the code directly, or as you will see in the following example, do it using the Properties window In this context the EventName refers to the name of the event launched by the control, and not to the target function in the C# code For example, a Button control may have a Click event, so the assignment
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EventName="Click"
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would mean that from inside the UpdatePanel container, the control outside the container is set up as a non-Ajax control Then within the UpdatePanel container, the triggers just listen for the appropriate event from the named control; only the updated material, and not the whole page, is updated
ASPNET 35: A Beginner s Guide
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Loading Images and Multiple Control Events with Ajax
A common feature of web sites is a series of images users can control For example, a set of images showing different products, different views of a manufacturing plant, or different people who work for a company all require that different images be loaded and unloaded quickly As you have seen, Ajax is great for loading text because just the text and not the whole page is reloaded In the same way, Ajax is great for loading images as well The first thing to do is to create a set of eight images (You need at least two and can have as many as you want, but the example is based on eight images) You can use any image format recognized by a browser GIF, JPEG, or PNG Set them to all the same size The example uses eight JPEG images set to 250 181 You can use any size you want, but for this exercise, keep them around that size Name them pix1jpg (or whatever graphic extension is appropriate) to pix8jpg If you use more or fewer than eight, you will have to change some of the code values to reflect the actual number used Finally, place all of the images in a folder named images You will be placing the images folder in the web site root folder with the Defaultaspx file The following steps show how to build the entire web site:
1 Open a new Web Site in Visual Studio 2008, and save it as AjaxPix Set the mode to
Design In the Windows Explorer, drag the images folder with the images you have created for this sample into the AjaxPix folder where you see the Defaultaspx file
2 Drag an UpdatePanel control from the Ajax Extensions menu in the Toolbox, and place
it in the div container
3 From the Standard menu in the Toolbox, drag an Image control and place it in the
UpdatePanel control container With the Image control selected, open the Properties window and select ImageUrl In the second column click the Browse button (the button with the three dots) and navigate to images | pix1jpg Once you select it, you will see ~/images/pix1jpg as the set value
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