Hide Trend line in combo chart when no selections are made?

[#1]

Hi all,

I need to hide the trend line that was created using linest functions when no selections are made. For example i have a combo chart with Month as it's dimension, and sum(Purchase) as one measure and Avg(Unit price) as other measure. When selections are made in Product column I need to show the trend line other wise just hide that line .

How to do this ?

any help will be appreaciated?

Note: I am able to show the trend line without any selections. Now i need to hide that and show it when I made some selections in product column.

Thank you

[Gysbert_Wassenaar]

No, you're absolutely right. So you're out of luck. Can't be done in Qlik Sense without a custom extension.

[#3]

It will be helpful if you can send any extension links to meet this requirement.

Thanks.