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POHow do I use the onBeforeUnload event with Script#?
 

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  1. POHow do I use the onBeforeUnload event with Script#?
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    <p>I'm using the Script# library with ASP.NET. I want to listen and respond to the onBeforeUnload browser event. </p> <p>I am currently intercepting the event like this:</p> <pre><code>Window.AttachEvent( "onbeforeunload", OnNavigateAway ); ... private void OnNavigateAway() { Script.Alert("You're leaving."); } </code></pre> <p>But the second parameter to Window.AttachEvent is a DOMEventHandler, which has a return type of void. To use the onBeforeUnload event, I need to be able to return a string value, which the browser uses as the confirmation message.</p> <p>Is there any way to do this without emitting a script literal or hand coding javascript? I would really prefer to stay in the compiled C# -> javascript as much as possible.</p> <p>In case it matters, I'm using version 0.5.5 of the Script# library, which isn't the latest version, but I am restricted to this for now.</p> <hr> <p>UPDATE: DuckMaestro answered my question perfectly, but it still didn't work for me. It is the correct answer to my question in that the compiled Javascript is exactly what I was expecting and wanting. But it doesn't have the desired effect of causing the browser to issue a warning prompt. </p> <p>I do have a work-around, though, in case someone else stumbles across this answer and wants to know how I initially hacked it into working. Instead of this:</p> <pre><code>public delegate string BeforeUnloadDelegate(); ... Window.AttachEvent( "onbeforeunload", (DOMEventHandler) (Object) new BeforeUnloadDelegate(OnNavigateAway) ); </code></pre> <p>I did this:</p> <pre><code>Script.Literal( "window.onbeforeunload = this._onNavigateAway" ); </code></pre> <p>This is bad form for a number of reasons. This will only work on the .debug.js class that Script# generates; Script# changes the names in the release version, so the script emitted by the Script.Literal statement won't match up. Also, it negates a lot of the benefits of using Script# in the first place. (For example, using Visual Studio's refactoring tools to rename OnNavigateAway to something else will leave an orphaned reference in the string.) Also, the C# code declares the method as OnNavigateAway, whereas the Script.Literal has to refer to this._onNavigateAway. </p> <p>Still, if, like me, you're on a deadline and looking for a hack, this is a place to start. If I make any more progress on a more correct version, I'll update this question with the details.</p> <p>Thanks again to DuckMaestro for answering the question I asked.</p>
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