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539 Lwc Integration Guide 58fca1f9 by tools-only

Name: 539 Lwc Integration Guide 58fca1f9
Author: tools-only

Flow + LWC Integration Guide

This guide covers embedding custom Lightning Web Components in Flow Screens.

Overview

┌─────────────────────────────────────────────────────────────────────┐
│                   FLOW SCREEN + LWC ARCHITECTURE                    │
├─────────────────────────────────────────────────────────────────────┤
│                                                                      │
│   ┌─────────────────────────────────────────────────────────────┐   │
│   │                      FLOW (Screen)                           │   │
│   │  ┌──────────────────────────────────────────────────────┐   │   │
│   │  │                  screens element                      │   │   │
│   │  │    ┌──────────────────────────────────────────────┐  │   │   │
│   │  │    │           fields > componentInstance         │  │   │   │
│   │  │    │                                              │  │   │   │
│   │  │    │   extensionName="c:myComponent"              │  │   │   │
│   │  │    │                                              │  │   │   │
│   │  │    │   inputParameters ────────────▶ @api (in)    │  │   │   │
│   │  │    │   outputParameters ◀────────── @api (out)    │  │   │   │
│   │  │    │                                              │  │   │   │
│   │  │    └──────────────────────────────────────────────┘  │   │   │
│   │  └──────────────────────────────────────────────────────┘   │   │
│   └─────────────────────────────────────────────────────────────┘   │
│                                                                      │
└─────────────────────────────────────────────────────────────────────┘

Quick Reference

Flow Element	LWC Requirement	Purpose
`extensionName`	`target="lightning__FlowScreen"`	Identify LWC component
`inputParameters`	`@api` with `role="inputOnly"`	Flow → LWC data
`outputParameters`	`@api` with `role="outputOnly"`	LWC → Flow data
N/A	`FlowAttributeChangeEvent`	LWC updates outputs
N/A	`FlowNavigationFinishEvent`	LWC controls navigation

Flow XML Structure

Basic Screen with LWC

<screens>
    <name>My_LWC_Screen</name>
    <label>Custom Component Screen</label>
    <locationX>176</locationX>
    <locationY>158</locationY>
    <connector>
        <targetReference>Next_Element</targetReference>
    </connector>
    <showFooter>true</showFooter>
    <showHeader>true</showHeader>

    <fields>
        <name>myLwcField</name>
        <!-- Component reference: namespace:componentName -->
        <extensionName>c:myFlowComponent</extensionName>
        <fieldType>ComponentInstance</fieldType>

        <!-- Flow → LWC (inputs) -->
        <inputParameters>
            <name>recordId</name>
            <value>
                <elementReference>var_RecordId</elementReference>
            </value>
        </inputParameters>

        <!-- LWC → Flow (outputs) -->
        <outputParameters>
            <assignToReference>var_SelectedId</assignToReference>
            <name>selectedRecordId</name>
        </outputParameters>
    </fields>
</screens>

Input Parameters

Pass data from Flow variables to LWC @api properties.

Value Types

<!-- String literal -->
<inputParameters>
    <name>mode</name>
    <value>
        <stringValue>edit</stringValue>
    </value>
</inputParameters>

<!-- Boolean literal -->
<inputParameters>
    <name>showDetails</name>
    <value>
        <booleanValue>true</booleanValue>
    </value>
</inputParameters>

<!-- Number literal -->
<inputParameters>
    <name>maxRecords</name>
    <value>
        <numberValue>10</numberValue>
    </value>
</inputParameters>

<!-- Flow variable reference -->
<inputParameters>
    <name>recordId</name>
    <value>
        <elementReference>var_CurrentRecordId</elementReference>
    </value>
</inputParameters>

<!-- Record variable (SObject) -->
<inputParameters>
    <name>account</name>
    <value>
        <elementReference>get_Account</elementReference>
    </value>
</inputParameters>

<!-- Collection variable -->
<inputParameters>
    <name>selectedIds</name>
    <value>
        <elementReference>col_SelectedRecordIds</elementReference>
    </value>
</inputParameters>

LWC Property Declaration

// LWC must declare matching @api properties
@api recordId;      // Maps to inputParameter name="recordId"
@api mode;          // Maps to inputParameter name="mode"
@api showDetails;   // Maps to inputParameter name="showDetails"
@api maxRecords;    // Maps to inputParameter name="maxRecords"

Output Parameters

Receive data from LWC @api properties into Flow variables.

Flow XML

<!-- Simple value output -->
<outputParameters>
    <assignToReference>var_SelectedRecordId</assignToReference>
    <name>selectedRecordId</name>
</outputParameters>

<!-- Boolean output -->
<outputParameters>
    <assignToReference>var_IsComplete</assignToReference>
    <name>isComplete</name>
</outputParameters>

<!-- Collection output -->
<outputParameters>
    <assignToReference>col_SelectedIds</assignToReference>
    <name>selectedIds</name>
</outputParameters>

LWC Dispatching Updates

CRITICAL: LWC must dispatch FlowAttributeChangeEvent for outputs to update.

import { FlowAttributeChangeEvent } from 'lightning/flowSupport';

@api selectedRecordId;

handleSelection(event) {
    this.selectedRecordId = event.detail.id;

    // REQUIRED: Notify Flow of the change
    this.dispatchEvent(new FlowAttributeChangeEvent(
        'selectedRecordId',    // Property name (must match meta.xml)
        this.selectedRecordId  // New value
    ));
}

Variable Types Mapping

Flow Type	LWC Type	XML Declaration
`String`	`String`	`<dataType>String</dataType>`
`Number`	`Number`	`<dataType>Number</dataType>`
`Currency`	`Number`	`<dataType>Currency</dataType>`
`Boolean`	`Boolean`	`<dataType>Boolean</dataType>`
`Date`	`String`	`<dataType>Date</dataType>`
`DateTime`	`String`	`<dataType>DateTime</dataType>`
`Record`	`Object`	`<objectType>Account</objectType>`
`Collection`	`Array`	`<isCollection>true</isCollection>`

Variable Declaration Examples

<!-- String variable -->
<variables>
    <name>var_SelectedId</name>
    <dataType>String</dataType>
    <isCollection>false</isCollection>
    <isInput>false</isInput>
    <isOutput>false</isOutput>
</variables>

<!-- Boolean variable with default -->
<variables>
    <name>var_IsComplete</name>
    <dataType>Boolean</dataType>
    <isCollection>false</isCollection>
    <isInput>false</isInput>
    <isOutput>false</isOutput>
    <value>
        <booleanValue>false</booleanValue>
    </value>
</variables>

<!-- Collection of strings -->
<variables>
    <name>col_SelectedIds</name>
    <dataType>String</dataType>
    <isCollection>true</isCollection>
    <isInput>false</isInput>
    <isOutput>false</isOutput>
</variables>

<!-- Record variable -->
<variables>
    <name>var_Account</name>
    <dataType>SObject</dataType>
    <isCollection>false</isCollection>
    <isInput>false</isInput>
    <isOutput>false</isOutput>
    <objectType>Account</objectType>
</variables>

Validation Patterns

Check LWC Output Before Proceeding

<screens>
    <name>LWC_Screen</name>
    <!-- ... -->
    <connector>
        <targetReference>Validate_Output</targetReference>
    </connector>
</screens>

<decisions>
    <name>Validate_Output</name>
    <label>Validate LWC Output</label>
    <defaultConnector>
        <targetReference>Show_Error</targetReference>
    </defaultConnector>
    <defaultConnectorLabel>Invalid</defaultConnectorLabel>
    <rules>
        <name>Is_Valid</name>
        <conditionLogic>and</conditionLogic>
        <conditions>
            <leftValueReference>var_SelectedId</leftValueReference>
            <operator>IsNull</operator>
            <rightValue>
                <booleanValue>false</booleanValue>
            </rightValue>
        </conditions>
        <connector>
            <targetReference>Continue_Flow</targetReference>
        </connector>
        <label>Valid Selection</label>
    </rules>
</decisions>

LWC-Side Validation

@api validate() {
    // Flow calls this when user clicks Next
    if (!this.selectedRecordId) {
        return {
            isValid: false,
            errorMessage: 'Please select a record before continuing.'
        };
    }
    return { isValid: true };
}

Screen Configuration

Navigation Options

<screens>
    <name>My_Screen</name>
    <allowBack>true</allowBack>      <!-- Show Back button -->
    <allowFinish>true</allowFinish>  <!-- Allow Finish (last screen) -->
    <allowPause>true</allowPause>    <!-- Show Pause button -->
    <showFooter>true</showFooter>    <!-- Show button bar -->
    <showHeader>true</showHeader>    <!-- Show screen label -->
</screens>

Hiding Standard Navigation

When LWC handles its own navigation:

<screens>
    <name>Custom_Nav_Screen</name>
    <showFooter>false</showFooter>  <!-- LWC provides buttons -->
    <!-- ... -->
</screens>

LWC then uses:

import { FlowNavigationFinishEvent } from 'lightning/flowSupport';

handleNext() {
    this.dispatchEvent(new FlowNavigationFinishEvent('NEXT'));
}

Multiple LWCs in One Screen

<screens>
    <name>Multi_LWC_Screen</name>
    <label>Multiple Components</label>

    <!-- First LWC -->
    <fields>
        <name>headerComponent</name>
        <extensionName>c:flowHeader</extensionName>
        <fieldType>ComponentInstance</fieldType>
        <inputParameters>
            <name>title</name>
            <value><stringValue>Select Options</stringValue></value>
        </inputParameters>
    </fields>

    <!-- Standard Flow field between LWCs -->
    <fields>
        <name>instructions</name>
        <fieldText>&lt;p&gt;Choose from the options below&lt;/p&gt;</fieldText>
        <fieldType>DisplayText</fieldType>
    </fields>

    <!-- Second LWC -->
    <fields>
        <name>selectorComponent</name>
        <extensionName>c:recordSelector</extensionName>
        <fieldType>ComponentInstance</fieldType>
        <outputParameters>
            <assignToReference>var_SelectedId</assignToReference>
            <name>selectedId</name>
        </outputParameters>
    </fields>
</screens>

Error Handling

Capture LWC Error Output

<fields>
    <outputParameters>
        <assignToReference>var_ErrorMessage</assignToReference>
        <name>errorMessage</name>
    </outputParameters>
</fields>

<!-- Check for errors after screen -->
<decisions>
    <name>Check_Errors</name>
    <rules>
        <name>Has_Error</name>
        <conditions>
            <leftValueReference>var_ErrorMessage</leftValueReference>
            <operator>IsNull</operator>
            <rightValue>
                <booleanValue>false</booleanValue>
            </rightValue>
        </conditions>
        <connector>
            <targetReference>Error_Handler</targetReference>
        </connector>
    </rules>
</decisions>

LWC Dispatching Errors

handleError(error) {
    this.errorMessage = this.reduceErrors(error);
    this.dispatchEvent(new FlowAttributeChangeEvent(
        'errorMessage',
        this.errorMessage
    ));
}

Context Variables

Pass Flow context to LWC using record context:

<!-- In Flow: Map $Record context -->
<inputParameters>
    <name>recordId</name>
    <value>
        <elementReference>$Record.Id</elementReference>
    </value>
</inputParameters>
<inputParameters>
    <name>objectApiName</name>
    <value>
        <elementReference>$Record.Object</elementReference>
    </value>
</inputParameters>

Templates

Template	Use Case
`assets/screen-flow-with-lwc.xml`	Complete LWC screen integration
`assets/apex-action-template.xml`	Calling Apex from Flow

Cross-Skill Integration

Integration	See Also
LWC Component Setup	sf-lwc/references/flow-integration-guide.md
Full Triangle Architecture	triangle-pattern.md
LWC FlowAttributeChangeEvent	sf-lwc/assets/flow-screen-component/

Troubleshooting

Issue	Cause	Solution
LWC not appearing in Flow Builder	Missing `isExposed` or target	Add `isExposed=true` and `target="lightning__FlowScreen"`
Properties not showing in builder	Missing `targetConfigs`	Add `targetConfig` with property definitions
Outputs not updating	Missing FlowAttributeChangeEvent	Dispatch event when value changes
Type mismatch error	Wrong dataType	Match Flow variable type to LWC property type
LWC not receiving inputs	Property name mismatch	Ensure `name` matches `@api` property exactly
Navigation not working	Wrong event type	Use `FlowNavigationFinishEvent` with action string

539 Lwc Integration Guide 58fca1f9

File contents

Flow + LWC Integration Guide

Overview

Quick Reference

Flow XML Structure

Basic Screen with LWC

Input Parameters

Value Types

LWC Property Declaration

Output Parameters

Flow XML

LWC Dispatching Updates

Variable Types Mapping

Variable Declaration Examples

Validation Patterns

Check LWC Output Before Proceeding

LWC-Side Validation

Screen Configuration

Navigation Options

Hiding Standard Navigation

Multiple LWCs in One Screen

Error Handling

Capture LWC Error Output

LWC Dispatching Errors

Context Variables

Templates

Cross-Skill Integration

Troubleshooting

Frequently asked questions

539 Lwc Integration Guide 58fca1f9

File contents

Flow + LWC Integration Guide

Overview

Quick Reference

Flow XML Structure

Basic Screen with LWC

Input Parameters

Value Types

LWC Property Declaration

Output Parameters

Flow XML

LWC Dispatching Updates

Variable Types Mapping

Variable Declaration Examples

Validation Patterns

Check LWC Output Before Proceeding

LWC-Side Validation

Screen Configuration

Navigation Options

Hiding Standard Navigation

Multiple LWCs in One Screen

Error Handling

Capture LWC Error Output

LWC Dispatching Errors

Context Variables

Templates

Cross-Skill Integration

Troubleshooting

Related skills

Frequently asked questions

How do I install the 539 Lwc Integration Guide 58fca1f9 skill?

What does the 539 Lwc Integration Guide 58fca1f9 skill do?

Is 539 Lwc Integration Guide 58fca1f9 safe to use?

Which AI agents work with 539 Lwc Integration Guide 58fca1f9?

Is 539 Lwc Integration Guide 58fca1f9 free to use?

Who published 539 Lwc Integration Guide 58fca1f9?