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Prem_ddsl
Advocate II
Advocate II

Dynamic Loops in PowerApps

PowerApps does not have a loop construct so it's not possible to iterate through a set of values and then perform some action within the loop.
However, PowerApps does have a ForAll function which evaluates a formula for all records of a table.
ForAll can be nested, so we can use a nested pattern to generate collections with quite a large number of rows.
For example, a collection with 10 rows allows us to generate a new collection with 100 rows.
The following code snippet allows us to build a collection with a specified number of rows.
=======================
//define a base collection from which you will generate your target collection.
ClearCollect(colBase, [1,2,3,4,5,6,7,8,9,10]);
//specify target rowcount
Set(vMaxRows, 57);
//setup collections to be used as inner and outer counters
ClearCollect(colOuter, colBase);
ClearCollect(colInner, colBase);
Set(vOuterMax, CountRows(colOuter));
//generate target collection
ForAll(colOuter, ForAll(colInner, Collect(colTarget, {RowId: colInner[@Value] + (vOuterMax * (colOuter[@Value] - 1)), Inner: colInner[@Value], Outer: colOuter[@Value]})));
RemoveIf(colTarget, RowId > vMaxRows)
======================
To visualise the above, insert a Data Table into your app and set it's datasource to colTarget and show the columns RowId, Inner, Outer.
 
I hope the community finds the above useful.
Regards,
Prem_ddsl
10 REPLIES 10
pwak
Regular Visitor

How about generate a number from min to max. Say from 5 to 8=[5,6,7,8]. In VB just For x=min to max: next x. In power apps I use timer and many counter. What is the better work around for this.

 

Thanks,

Noel

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