How Do I Pass Over The Values Of Merge Fields Inse Of Dynamically Created Input Fields In A Custom Property Editor?

Apr 25, 2025 by ADMIN 116 views

**How to Pass Values of Merge Fields to Dynamically Created Input Fields in a Custom Property Editor**

Introduction

When building custom property editors for Apex actions inside a record-triggered flow, it's essential to understand how to pass values of merge fields to dynamically created input fields. This article will guide you through the process of achieving this in a Lightning Web Component (LWC) custom property editor.

Understanding the Requirements

To tackle this challenge, let's break down the requirements:

We have a Lightning Web Component (LWC) acting as a custom property editor.
The custom property editor is used for an Apex action inside a record-triggered flow.
We need to pass values of merge fields to dynamically created input fields.

Setting Up the Custom Property Editor

Before we dive into the solution, let's set up the custom property editor. In your LWC, create a property editor component that will handle the dynamic creation of input fields. You can use the following code as a starting point:

import { LightningElement, api } from 'lwc';
export default class CustomPropertyEditor extends LightningElement {
@api recordId;
@api mergeFields;
@api inputFields;
connectedCallback() {
    this.createInputFields();
}

createInputFields() {
    // Dynamically create input fields based on merge fields
    this.inputFields = this.mergeFields.map((field) =&gt; {
        return {
            label: field.label,
            value: field.value,
            fieldName: field.fieldName
        };
    });
}

}

In this code, we've created a CustomPropertyEditor component that takes three properties: recordId, mergeFields, and inputFields. The connectedCallback method is used to create the input fields dynamically based on the merge fields.

Passing Values of Merge Fields to Input Fields

Now that we have the custom property editor set up, let's focus on passing the values of merge fields to the dynamically created input fields. We can achieve this by using the value property of each input field and binding it to the corresponding merge field value.

Here's an updated version of the createInputFields method:

createInputFields() {
    // Dynamically create input fields based on merge fields
    this.inputFields = this.mergeFields.map((field) => {
        return {
            label: field.label,
            value: field.value,
            fieldName: field.fieldName,
            valueBinding: `this.${field.fieldName}`
        };
    });
}

In this updated code, we've added a valueBinding property to each input field. This property is set to the corresponding merge field value, prefixed with this. to indicate that it's a property of the component.

Using the Value Binding in the Input Fields

Now that we have the value binding set up, let's use it in the input fields. We can do this by using the value property of each input field and binding it to the value binding.

Here's an updated version of the template property:

template {
    // Dynamically create input fields based on merge fields
    this.inputFields.forEachfield) => {
        this.template.append(
            <lightning-input
                label={field.label}
                value={field.value}
                valueBinding={field.valueBinding}
                oninput={this.handleInputChange}
            />
        );
    });
}

In this updated code, we're using the value property of each input field and binding it to the value binding. We're also using the oninput event to handle changes to the input field values.

Handling Changes to Input Field Values

To handle changes to the input field values, we can use the handleInputChange method:

handleInputChange(event) {
    // Get the input field value
    const inputValue = event.target.value;
// Update the corresponding merge field value
this.mergeFields.find((field) =&gt; field.fieldName === event.target.name).value = inputValue;

}

In this method, we're getting the input field value and updating the corresponding merge field value.

Conclusion

In this article, we've covered how to pass values of merge fields to dynamically created input fields in a custom property editor. We've set up a Lightning Web Component (LWC) custom property editor and used the value property of each input field to bind it to the corresponding merge field value. We've also handled changes to the input field values using the handleInputChange method.

By following the steps outlined in this article, you should be able to pass values of merge fields to dynamically created input fields in your custom property editor.

Additional Resources

Example Use Case

Here's an example use case for the custom property editor:

Create a record-triggered flow that uses an Apex action.
Use the custom property editor to pass values of merge fields to dynamically created input fields.
Use the input field values to update the corresponding merge field values.

Q: What is a custom property editor, and why do I need it?

A: A custom property editor is a Lightning Web Component (LWC) that allows you to create custom input fields for an Apex action inside a record-triggered flow. You need it to pass values of merge fields to dynamically created input fields.

Q: How do I set up a custom property editor?

A: To set up a custom property editor, you need to create a Lightning Web Component (LWC) that takes three properties: recordId, mergeFields, and inputFields. The connectedCallback method is used to create the input fields dynamically based on the merge fields.

Q: How do I pass values of merge fields to dynamically created input fields?

A: To pass values of merge fields to dynamically created input fields, you need to use the value property of each input field and bind it to the corresponding merge field value. You can achieve this by using the valueBinding property and prefixing it with this. to indicate that it's a property of the component.

Q: How do I handle changes to input field values?

A: To handle changes to input field values, you need to use the handleInputChange method. This method gets the input field value and updates the corresponding merge field value.

Q: What is the `valueBinding` property, and how do I use it?

A: The valueBinding property is used to bind the value of an input field to the corresponding merge field value. You can use it by prefixing the merge field name with this. to indicate that it's a property of the component.

Q: How do I use the `handleInputChange` method?

A: To use the handleInputChange method, you need to get the input field value and update the corresponding merge field value. You can achieve this by using the event.target.value property to get the input field value and updating the merge field value using the this.mergeFields.find() method.

Q: What are some best practices for creating a custom property editor?

A: Some best practices for creating a custom property editor include:

Using a Lightning Web Component (LWC) to create the custom property editor.
Using the connectedCallback method to create the input fields dynamically based on the merge fields.
Using the value property of each input field to bind it to the corresponding merge field value.
Handling changes to input field values using the handleInputChange method.

Q: What are some common issues that I may encounter when creating a custom property editor?

A: Some common issues that you may encounter when creating a custom property editor include:

The input fields not being created dynamically based on the merge fields.
The input field values not being updated correctly.
The handleInputChange method not being called correctly.

Q: How do I troubleshoot issues with my custom property editor?

: To troubleshoot issues with your custom property editor, you can use the following steps:

Check the console logs for any errors.
Use the debugger to step through the code and identify the issue.
Use the console.log() function to print out the values of variables and identify the issue.

Q: What are some resources that I can use to learn more about creating custom property editors?

A: Some resources that you can use to learn more about creating custom property editors include:

The Lightning Web Components documentation.
The Visual Workflow documentation.
Salesforce Trailhead tutorials.
Salesforce Developer Network (SDN) articles.

By following these Q&A, you should be able to create a custom property editor that passes values of merge fields to dynamically created input fields.