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I want to build my own extension that filters data. I.e. it has a date input of some kind the user sets, and then in turn tells the data give me stuff where col_date = myDateVar. Are there any tutorials on something similar?
Not exactly a tutorial, but a useful resource would be other similar projects, which you could find at Qlik Branch
So I was looking at one, a date picker specifically. But I'm not really unclear on how I tell qlick, here is the date, filter the data for me. Is there any way you could point me in the right direction?
So, there's quite a few ways, actually. I can give you some quick resources on 3
Method 1
If you're making selections from your custom object, this one may be appropriate
selectValues method ‒ Qlik Sense
This one enables the selection preview, just like a standard qlik object. There's an example in the doc link above.
Method 2
This is just like method 1, but bypasses the selection preview, and sends the selection straight to the engine
selectValues method ‒ Qlik Sense
Method 3
You can also grab a reference to the current app and use the field API. 2 links below, 1 for grabbing the reference to the current app, and one to the Field API.