Problems with ChoiceDialog inside a Dynamic: Bug or not (well) documented limitation?
- To: mathgroup at smc.vnet.net
- Subject: [mg107725] Problems with ChoiceDialog inside a Dynamic: Bug or not (well) documented limitation?
- From: Guido Tripaldi <guido at gtripaldi.it>
- Date: Thu, 25 Feb 2010 01:49:43 -0500 (EST)
Hi Group, suppose you wanna to display an alert to the user before to continue the execution of your code when some conditions occur : probably you'll use ChoiceDialog[], the useful function that "puts up a standard choice dialog that displays expr together with OK and Cancel buttons, and returns True if OK is clicked, and False if Cancel is clicked.". But if you use this function inside some Dynamic[] object, it hangs the kernel. I've tried to find in the documentation some references to this bad combination without any luck, so I don't understand if this is a bug or there is something missing in the code. To better explain the problem here is a very basic example: (* just a silly example *) Grid[{ {"Choose a dividend: ", PopupMenu[Dynamic[dividend], Table[i, {i, 0, 10}]]}, {"Choose a divisor : ", PopupMenu[Dynamic[divisor], Table[i, {i, 0, 10}]]}, {"Quotient: ", Dynamic[dividend / divisor]} }, Frame -> All] Dynamic[ If[divisor == 0, ChoiceDialog["Uh-oh, you are going to do a division by zero! Please select a different divisor.", {"Ok"}]; ]]; Instead, if you use the MessageDialog[] function to show a message window, all works well, but of course the execution will continue without waiting for the user action (that is not what I want). Same situation if you try to use ChoiceDialog[] inside a TabView, or other kind of Views: (* another silly example *) TabView[{ "Tab1" -> Button["Show ChoiceDialog", result = ChoiceDialog["This hangs.. :-(."];], "Tab2" -> Button["Show MessageDialog", MessageDialog["This works!"];] }] Any suggestion? thanks! G ps M7.0.1.0 on Mac Snow 10.6.2 --- Guido Tripaldi
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