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How to assign a value to a real type form control

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Posted on by Johnny

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Hello,

On an extension of Form I have added a Real type control to the form, where I want to assign the number of currently selected lines from grid.

I have created a class and copied the "OnActivated" event of the main datasource. There I have placed the below code:

[FormDataSourceEventHandler(formDataSourceStr(ReqTransPo, ReqPo), FormDataSourceEventType::Activated)]
    public static void ReqPo_OnActivated(FormDataSource sender, FormDataSourceEventArgs e)
    {
        FormRun formRun = sender.formRun() as FormRun;
        
        FormRealControl numOfLinesControl = formRun.design().controlName(formControlStr(ReqTransPo, NumOfLinesXX)) as FormRealControl;
        numOfLinesControl.realValue(sender.recordsMarked().lastIndex());
    }

When I open the form it gives the error message "Object reference not set to an instance of an object."

What do I need to change?

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nmaenpaa 101,160 Moderator on at

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RE: How to assign a value to a real type form control

You should be able to find plenty of examples if you search the web for "dynamics ax (or 365 operations) get number of selected records on grid".

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Johnny 6,470 on at

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RE: How to assign a value to a real type form control

Not sure what was happening. I did the full build of extension model and it's working now.

But it is working when I select the lines one by one. If I click the "thing" (don't know how it is called) which selects all the lines in the grid the value of my field isn't updated.

Which event should I possible use to get the number of all lines if I click "select all lines" thing on grid?

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nmaenpaa 101,160 Moderator on at

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RE: How to assign a value to a real type form control

I think debugging already helped a great deal. Now we know that the issue is in accessing the real control. And not something in line 7, and definetely not in assigning a value to a real control. Perhaps you already knew it but we didn't.

Are you sure that NumOfLinesXX a real control, and not an integer?

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Johnny 6,470 on at

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RE: How to assign a value to a real type form control

I have re-written the line like:

FormRealControl numOfLinesControl = formRun.control(formRun.controlId(formControlStr(ReqTransPo, NumOfLinesXX))) as FormRealControl;

But it still getting NULL.

The control Auto Declaration property is set to Yes

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Johnny 6,470 on at

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RE: How to assign a value to a real type form control

Yes, it returns null on line 6. Debugging will not really help here, that's why I asked a question here to get an answer how to correctly initialize my FormRealControl.

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nmaenpaa 101,160 Moderator on at

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RE: How to assign a value to a real type form control

You can assign it by MyControlName.realValue(myRealValue);

So, your problem is not "how to assign a value to a real type form control". Instead you are trying to call a method on a null object.

You must debug your code to find the issue.

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