Show/hide fields conditionally in PowerApps forms based on dropdown selection

I’m working on digitizing a form to improve the user experience and our data collection and availability efforts. I decided to do this one in PowerApps as we begin to pivot organizationally toward the modern experience.

During building this particular form, I needed to hide fields unless the user indicated “Yes” to corresponding dropdown fields. Here’s the end-result:

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To get this to work we have to do three steps:

  1. Initialize variables for visibility
  2. Set the conditional fields’ visibility to the new variables
  3. Set the dropdown to toggle the related variable

Initialize variables for visibility

First we need to tell our app that we’ll be using true/false variables to indicate the visibility of our conditional fields. We do this from the OnVisible property (2) of the Form Screen (1).

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The formula itself should be as follows (3). Use a semi-colon between each UpdateContext function to add additional variables. I’m using aVisible, bVisible, etc.

UpdateContext({aVisible: false});UpdateContext({bVisible: false});UpdateContext({cVisible: false})

So in your documentation you might note something like:

VariableDefault stateChanged byHides/Shows
aVisiblefalse (hidden)BAARequired
bVisiblefalse (hidden)ConflictsOfInterest
cVisiblefalse (hidden)DataSecurityRisk

Note: You can use the same variable more than once to show/hide multiple fields based on one dropdown.

Set the conditional fields’ visibility to the new variables

Now we need to assign these variables to the DataCards for each field we wish to hide.

From the Tree View panel, select the DataCard (not the DataCardValue within/beneath it) for the field you wish to hide (1). Then go to its Visible property (2). Finally, set the property’s function to the variable you initialized for it (3). In this example I decided I would use “cVisible” for “DataSecurityRiskCompleted”.

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Repeat the steps above, assigning variables to each field you want to hide until a dropdown is changed to the triggering value.

Set the dropdown to toggle the related variable

The last step is to tell the variables we established to change based on a dropdown.

First select the DataCardValue (not the DataCard) within the data card (1).

Then select the OnChange property (2) and set the function to the following (3):

Switch(DataCardValue46.Selected.Value,"Yes",UpdateContext({cVisible: true}),UpdateContext({cVisible: false}))
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Repeat for each dropdown that should serve as a trigger for conditional fields. Now, when I publish my app, changing “Data Security Risk” to “Yes” will change the default false visibility of DataSecurityRiskCompleted to true. If I change the dropdown to “No” again, it will hide the related field again.

Alertus integration in SharePoint via Microsoft Flow

I’m by no means an HTTP request expert, but the requirement of being able to integrate business applications is common and, in this case, important. I took some time to figure out how we could implement Alertus integration and am sharing what worked here.


Alertus is a program we use at LMH Health to push mass-notification desktop and mobile alerts to the organization during times of severe weather, evacuation procedures, or just software downtime.

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We use SharePoint as a supplement for “breaking news” by adding a banner to the top of our site during times of urgency. We wanted to integrate Alertus with SharePoint so that when an alert fired, it created a breaking news banner in SharePoint as well. This makes sure users who aren’t on a managed device, such as working from a home computer, are still able to get important news if they happen to be on the intranet.

In times of emergency, it’s best to utilize as many channels as possible to inform your users. Integration of these two services meant there’d be minimal delay in broadcasting a single message through all available channels.

How it works

To send the Alertus alert data to SharePoint, we needed something capable of receiving an HTTP request so Flow came to mind first. Once configured, your Alertus administrators will just send alerts as usual, being sure to include SharePoint in the alert profile.

  1. Create and send an alert in Alertus
  2. Flow receives HTTP request with alert data
  3. Flow creates item in SharePoint list used for breaking news

And, of course, with Flow we could then do any number of actions including additional HTTP actions, sending to email or phone, etc.

Note: This works for SharePoint server and SharePoint online. If using server, you’ll need the on-premises data gateway so that Flow can connect to your environment.

Setting it up

We need to do a few things to get this working:

1. Start creating a Flow (to get the HTTP POST URL)
2. Create the Alertus Service for “SharePoint”
3. Add the Alertus Service “SharePoint” to any Alert profiles for which you want to include SharePoint for distribution
4. Finish the Flow
5. Test

Start creating a Flow

1. Create a new Flow with the When a HTTP request is received trigger

2. Paste the following into the Request Body JSON Schema

    "type": "object",
    "properties": {
        "Content-Type": {
            "type": "application/json"
        "id": {
            "type": "string"
        "clientName": {
            "type": "string"
        "clientVersion": {
            "type": "string"
        "sender": {
            "type": "string"
        "message": {
            "type": "string"
        "sentDateTime": {
            "type": "string"
        "expires": {
            "type": "string"

3. Expand Show advanced options and make sure method is POST

4. Copy the HTTP POST URL at the top of the step using the copy icon

Create an Alertus alert service for SharePoint

1. Go to Alertus, then click Configure System > Alert Services

2. Click +Add Alert Service

3. Select HTTP Request for Service Type, then name and describe the service.

4. Configure the rest of the alert service as follows, pasting in the content provided below

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Activation Headers

Accept: application/json, text/plain
Content-Type: application/com.alertus-v1.0+json

Activation Body

{ "id":"${alert.originId}",

5. Click Save Alert Service

Add the service to alert profiles and/or preset alerts (optional)

Your service is now available to be added to alert profiles (pre-selected sets of services to notify under certain circumstances, such as an evacuation) and preset alerts (customized alerts and notification groups).

Alert profile example of adding the new SharePoint service we created
Preset alert example of adding the new SharePoint service as a delivery method for the alert

You could, alternatively, choose not to include it in anything preset and only use it manually upon creation/configuration of an alert.

Finish the Flow

1. Go back to the Flow you started.

2. Add a HTTP Response step and make sure the Status Code is set to 200. This lets Alertus know the request was received and prevents an error from occurring on the Alertus side.

3. Add a SharePoint: Create item step and connect to the site and list for which you want to create an item from the alert details.


From Alertus, do a Custom Activation of a test message just for the SharePoint service/delivery method.

In the example below, I also threw in an email alert as a step but you can see the whole process in Flow’s run history still only took 2 seconds.

Check in SharePoint that the item was added. In my case, we use custom script to display the most recent list item as an active alert.

Additional Configuration (optional)

Now that you’ve done the basics, you may wish to make adjustments.

  • Check out Alertus’ Knowledgebase (must be a customer with login credentials) at .
    • Search for HTTP Request (Documentation) where you’ll find additional placeholder variables you could use in the Activation Body and JSON Schema fields to send additional details.
  • Add additional steps in Flow
    • An approval process before posting the details
    • An email or text message to a person or group
    • Update a spreadsheet/log
    • Post a message to Teams