PowerApps SharePoint list delegation filter

Power Apps Search Function Delegation Warning Workarounds

• Posted by - Matthew Devaney
• on - July 25, 2021
• 8 Comments

Search is one of the most requested app features, however, the Power Apps search function has one major limitation. It cannot find any results past the 2,000th row in a table due to delegation. So how do can we perform searches in Power Apps and help users find the information they need? In this article I will show you all known Power apps Search function delegation warning workarounds.

Introduction: The Car Inventory Search App

The Car Inventory Search app is used by salespeople at a car dealership to determine which cars are currently in inventory.

Make The Car Inventory Search App

Create a new SharePoint list calledCar Sales Inventorywith the following columns:

• Year [number]
• Make [single-line text]
• Model [single-line text]

Include this data in the list:

[3,000 rows]

Start a new app from blank in Power Apps Studio. Make a title bar with a text input at the top where the user can type in keywords to perform a search.

Add the Car Sales Inventory SharePoint list as a datasource then insert a gallery onto the screen

and use this code in the Items property.

Change the layout of the gallery to Title so there is only one label on each row. Write this code in the text property of the label. Now the gallery will display the every cars year, make and model.

Write A Search Function With A Delegation Warning

When a user types their search terms into the search bar the gallery below updates to show only matching results.

Update the code in the Items property of the gallery to include the Search function. The make and model columns can be searched because they are text but the year column cannot be because it is a number.

The search function will produce a delegation warning because it is not included in the list of delegable functions for SharePoint. This means that by default only the first 500 rows of the Car Sales Inventory will be searched and returned or 2,000 rows if you increased the limit in advanced settings.

Search Function Delegation Warning Workarounds

There are 3 delegation workarounds for the Search Function:

1. StartsWith Delegation Workaround For The Search Function

While the Search function cannot be delegated in SharePoint the StartsWith function can. This means we can make a search bar that looks at the start of every word and shows all results in the gallery. The trade-off is any words found in the middle of a text column will not be returned when searching.

To use the StartsWith delegation workaround for searching use this code in the Items property of the gallery.

2. Search + Filter Delegation Workaround For The Search Function

Another workaround is to pre-filter the results on some criteria that will return less than 2,000 rows and then perform the search on that smaller chunk of data. The car inventory has 3,000 rows for cars which are located in 5 cities. We know that any city selected will return less that 2,000 rows so its OK to use this workaround.

Place a dropdown control in the top-right corner of the app and use this code in the Items property to display the city names.

Then write this code in the Items property of the gallery. The delegation warning will still appear but you can safely ignore it.

3. Dataverse IN Operator Delegation Workaround For Search Function

If we require full search capabilities the final workaround is to change the datasource from SharePoint to Dataverse For Teams [which also does not require premium licensing]. The IN operator can be delegated in Dataverse and can check the contents of a column for a matching text string. This feature is still in Preview so we must enable it by going to File > Advanced Settings > Upcoming Features > Preview.

After we change the datasource to Dataverse For Teams and upload all of our Car Inventory data

we can write a FILTER function like this in the Items property of the gallery to perform a search.

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