How to call an APEX Class from a Screen-Flow

By | December 30, 2021
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This blog post will go over how to use a Screen Flow to call an Apex class using a straightforward example. The Screen Flow generated in this example has three variables that we have created. Initially, recordId is configured to be available for both input and output.

1. RecordId Variable

RecordId Variable

The second variable that we have created is the Account to store Account Data.

2. Account Variable

Account Variable

The third variable that we have created is Name. That stores the return value of the Apex class called in the flow.

3. Name Variable

Name Variable

Then we create an Invocable method in class InvokeAccountAction.apxc which will be called through the Screenflow to return the Name of an particular Account as follows:

public class InvokeAccountAction 
{
  @InvocableMethod(callout=true label='Get Account Name')    
  public static List<String> getAccountNames(List<ID> ids) {
    List<String> accountNames = new List<String>();
    List<Account> accounts = [SELECT Name FROM Account WHERE Id in :ids];
    for (Account account : accounts) {
      accountNames.add(account.Name);
    }
    return accountNames;
  } 
}

Meanwhile, to call the Apex class from the flow we create an Apex action in the flow as shown in the image below:

4. Apex Action

Apex Action
Apex Action

For example, after calling an Apex class we want to make sure that the return value against the field Name of the particular Account is not empty.

5. Check Return Value

Check return value

After that, we create a screen to show the name of that Account, if the condition is satisfied.

6. Edit Screen

Edit Screen
Edit Screen

Likewise, the whole flow can be built as shown in the image below:

7. ScreenFlow

ScreenFlow

Likewise, after you have completed built the flow you can create a Button Invoke Method to call the flow:

8. Account Screen with Invoke Method Button

Account Screen with Invoke Method Button

After execution of the flow, we get a Screen which shows the Account Name as shown below:

9. Resulted Data

Resulted Data

We hope that you find this blog helpful, if you still have queries, don’t hesitate to contact us at salesforce@greytrix.com.

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