How to trap Cancel press event for a progress bar

hav · 2007-08-21

Hi all,
I have created a dialog window to display progress bar. The progress bar is working fine

When the progress bar is running and if i press Cancel button on the dialog window, it closes the dialog and terminates any further processing.

What i want to know is how to trap the Cancel button press event while updating the progress bar on a dialog window.

What exactly happens when this event takes place?

Pls answer to the above questions if any one of you know this.

Regards,

matttrax · 2007-08-21

Never actually done it, but I think it would be something like this.

Your progress bar has a variable that updates until it reaches 100, lets call it counter. If you press the Cancel button then the counter will not be 100 when the next line executes.

So right before the code that executes after the Dialog is supposed to close you could put:

IF Counter <> 100 THEN //I got here without finishing the processing
  CancelCleanUp() //Or whatever code you want to use

I hope that helps

hav · 2007-08-21

First of all thanks for your help.

I agree with you but the doubt still remains.

I am not sure where exactly within the loop the condition to rollback and skip further processing should be written.

For example:-

Open Progress Bar dialog

Fetch first record
Repeat
   do some processing
   update count of records
   Update progress bar
Untill Next record exists

Do further processing

On pressing Cancel on progress bar,
Q --> The control goes to which statement?
Q --> Does Navision exits the loop?
Q --> Any processing carried out so far is rolled back?
Q --> Any further processing is carried out?

Pls reply to above questions

Regards,

David_Singleton · 2007-08-21

hav wrote:

Hi all,
I have created a dialog window to display progress bar. The progress bar is working fine

When the progress bar is running and if i press Cancel button on the dialog window, it closes the dialog and terminates any further processing.

What i want to know is how to trap the Cancel button press event while updating the progress bar on a dialog window.

What exactly happens when this event takes place?

Pls answer to the above questions if any one of you know this.

Regards,

This is all covered by the Version Principle, there is no "roll back" in Navision. All you need to do is write code according to the NAV guidelines, and all will be fine.

absolutelyfreeweb · 2009-04-09

I may be wrong but I imho the dialog box cancel button is designed incompletely.

If you use a progressbar for a task where the outcome is not given, you normally want to close it when either you complete your task, or when the progressbar is finished and it times out. Now when you check if you are finished and want to close the bar, the user might alraedy have closed it with the cancel button. There is no way to know that its not there, and the close function doesnt work with "if" and it throws an error. This is really a design error, the close function should allow a "if not dialog.close()" check and not throw an error.

What do you think?

Malajlo · 2009-04-09

What about

If not DoSomeProcessing then DoSomethingElse

Function: DoSomeProcessing(return:boolean)
Dialog.Open
...
exit(TRUE)

How to trap Cancel press event for a progress bar

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