Power Apps - Query String Parameter

Let’s learn how can we passing parameter to our Canvas Apps.

QUERY STRING PARAMETER

In this Example, I built a simple app to write a ticket in SharePoint List. In this case , I need to pass (from “external”) a parameter to our App, to set Ticket Type. My choose are:

• Infrastructure
• Software
• Services

To achievement this, we should use “Query String” and Param Function. Query String is part of url , used to passing data to application.

Step 1 - Get query string from App

To get query string, I used param function in OnVisible event of my Screen to get date and store it on local variable. I can’t use “On Start” event of app because UpdateContext is only available while you are currently on a screen. When the OnStart code is executed no screen has loaded yet.

Code to copy:

If( Param(“TicketType”) <> Blank(), UpdateContext({selectedTicketType: Param(“TicketType”)}), UpdateContext({selectedTicketType: “Infrastructure”}) );

Step 2 - Set Default Value to control

In my Example, I used a Form with SharePooint list as Datasource . My field “Ticket Type” is Choose field. To set value as default, I set Default property of datacard, only if the form is in “insert mode”. Why? because if we are in view or in edit, we need to see data of item, not our parameter. So:

Code to copy:

If( frmCreateTicket.Mode = FormMode.New, { ‘@odata.type’: “#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference”, Id: 0, Value: selectedTicketType }, ThisItem.TicketType )

Finally

You should call your app with query string, in my case:

https://apps.powerapps.com/play/xxx-xxx-xxx-xxx?tenantId=xxxx-xxx-xxx-xxxx**&TicketType=Services**

(xxxx are guid of your app and tenant id, you see it when you run an app in browser)

Have a nice day!