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How to keep only 1 form instance open

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Posted on by Mav

Hi Experts

I have a custom form , currently a user can open as many instance as he wants by clicking on the menu item.

I want to restrict this in a way that user at any given point can open only 1 instance of the form, please share how do i achieve this.

Thanks

Mav

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Sergei Minozhenko 23,091 on at

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RE: How to keep only 1 form instance open

Hi Mav,

In this case, probably, server global cache will work and you can use formname+userId as cache key.

Alternatively, You can use table where you can store information about the user who already opened the form.

One form init you can check if there is a record in the table and if it's not, open a form and insert record to the table with current user id, if yes, throw an error that user can't open another instance of the form.

On form close, you need to remove the record for the current user from the table.

At least with the table, you have admin access to fix the issue by deleting the record if something goes wrong.

Also, it would be good to clean the table on AOS startup (Application.starupPost) in case of AOS went down.
Mav on at

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RE: How to keep only 1 form instance open

Modal form as described would do this

"Using this code, nearly every form could be opened in a modal way, so you have to close the form first before you will be able to return to AX."

Which is not the requirement , user should be able to return to Ax & do multitasking with other forms , however at any given point a user should not be able to open more than 1 instance of the same custom form.

Thanks

Mav
Sergei Minozhenko 23,091 on at

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RE: How to keep only 1 form instance open

Hi Mav,

Have you checked if the modal form can help you?

www.axaptapedia.com/Modal_forms

www.schweda.net/blog_ax.php
Mav on at

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RE: How to keep only 1 form instance open

It’s related to ax2012
Ludwig Reinhard Microsoft Employee on at

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RE: How to keep only 1 form instance open

Hi Mav,

Is this a question that is related to D365FO or AX2012?

Best regards,

Ludwig
Mav on at

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RE: How to keep only 1 form instance open

That is having multi company scenario plus other scenarios which are not requried in my simple request which is to ensure that at any given time a user is able to open only 1 instance of the form.

Found this, can anyone suggest how do i use Singleton for Ax custom form.

http://thinkinginax.blogspot.com/2014/02/singleton-pattern-in-x.html
Gunjan Bhattachayya 35,421 on at

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RE: How to keep only 1 form instance open

Hi Mav,

Please take a look at "ReleaseUpdateCockpit" form. Only one instance of the form can be run at a time. It uses a class "ReleaseUpdateRunning" to save the session Id for the form.

Please check the init method in this form.

You could try doing something similar to make sure you have only one instance running per session, or else throw an error.