Expand refresh view api recipes (#922)

Add custom component view refresh recipe

force-app/main/default/classes/AccountController.cls

@@ -4,6 +4,11 @@ public with sharing class AccountController {
         return [SELECT Id, Name FROM Account WITH USER_MODE LIMIT 10];
     }
 
+    @AuraEnabled(cacheable=true)
+    public static Integer getTotalNumber() {
+        return [SELECT COUNT() FROM Account WITH USER_MODE];
+    }
+
     @AuraEnabled(cacheable=true)
     public static Account getSingleAccount() {
         return [

force-app/main/default/classes/TestAccountController.cls

@@ -22,6 +22,17 @@ public class TestAccountController {
         Assert.areEqual(10, accts.size());
     }
 
+    @isTest
+    static void getTotalNumber_returnsCount() {
+        TestAccountController.createAccounts(10);
+
+        Test.startTest();
+        Integer accountNumber = AccountController.getTotalNumber();
+        Test.stopTest();
+
+        Assert.areEqual(10, accountNumber);
+    }
+
     @isTest
     static void getSingleAccount() {
         TestAccountController.createAccounts(1);

force-app/main/default/flexipages/Refresh_View.flexipage-meta.xml

@@ -45,6 +45,12 @@
         <type>Region</type>
     </flexiPageRegions>
     <flexiPageRegions>
+        <itemInstances>
+            <componentInstance>
+                <componentName>viewToRefresh</componentName>
+                <identifier>c_viewToRefresh</identifier>
+            </componentInstance>
+        </itemInstances>
         <name>region3</name>
         <type>Region</type>
     </flexiPageRegions>

force-app/main/default/lwc/dispatchRefreshEvent/dispatchRefreshEvent.html

@@ -30,7 +30,8 @@
         </div>
 
         <c-view-source source="lwc/dispatchRefreshEvent" slot="footer">
-            Refresh data in a view without reloading the page thanks to the
+            Create an account and refresh data in a view without reloading the
+            page thanks to the&nbsp;
             <a
                 href="https://developer.salesforce.com/docs/component-library/documentation/en/lwc/lwc.data_refreshview"
                 target="_blank"

force-app/main/default/lwc/viewToRefresh/__tests__/data/getRecord.json

@@ -0,0 +1,32 @@
+{
+    "apiName": "Contact",
+    "childRelationships": {},
+    "eTag": "846fdcd21a53214d447e578adbe263c6",
+    "fields": {
+        "Email": {
+            "displayValue": null,
+            "value": "[email protected]"
+        },
+        "Name": {
+            "displayValue": null,
+            "value": "Amy Taylor"
+        },
+        "Phone": {
+            "displayValue": null,
+            "value": "4152568563"
+        },
+        "Title": {
+            "displayValue": null,
+            "value": "VP of Engineering"
+        },
+        "Picture__c": {
+            "displayValue": null,
+            "value": "https://s3-us-west-2.amazonaws.com/dev-or-devrl-s3-bucket/sample-apps/people/amy_taylor.jpg"
+        }
+    },
+    "id": "0031700000pHcf8AAC",
+    "lastModifiedById": "00517000002fESIAA2",
+    "lastModifiedDate": "2019-02-15T10:33:07.000Z",
+    "recordTypeInfo": null,
+    "systemModstamp": "2019-02-15T10:33:07.000Z"
+}

force-app/main/default/lwc/viewToRefresh/__tests__/data/getRecordNoPicture.json

@@ -0,0 +1,28 @@
+{
+    "apiName": "Contact",
+    "childRelationships": {},
+    "eTag": "846fdcd21a53214d447e578adbe263c6",
+    "fields": {
+        "Email": {
+            "displayValue": null,
+            "value": "[email protected]"
+        },
+        "Name": {
+            "displayValue": null,
+            "value": "Amy Taylor"
+        },
+        "Phone": {
+            "displayValue": null,
+            "value": "4152568563"
+        },
+        "Title": {
+            "displayValue": null,
+            "value": "VP of Engineering"
+        }
+    },
+    "id": "0031700000pHcf8AAC",
+    "lastModifiedById": "00517000002fESIAA2",
+    "lastModifiedDate": "2019-02-15T10:33:07.000Z",
+    "recordTypeInfo": null,
+    "systemModstamp": "2019-02-15T10:33:07.000Z"
+}

force-app/main/default/lwc/viewToRefresh/__tests__/viewToRefresh.test.js

@@ -0,0 +1,131 @@
+import { createElement } from 'lwc';
+import ViewToRefresh from 'c/viewToRefresh';
+import getTotalNumber from '@salesforce/apex/AccountController.getTotalNumber';
+import {
+    registerRefreshHandler,
+    unregisterRefreshHandler,
+    RefreshEvent
+} from 'lightning/refresh';
+import { refreshApex } from '@salesforce/apex';
+
+// Mock Apex wire adapter
+jest.mock(
+    '@salesforce/apex/AccountController.getTotalNumber',
+    () => {
+        const {
+            createApexTestWireAdapter
+        } = require('@salesforce/sfdx-lwc-jest');
+        return {
+            default: createApexTestWireAdapter(jest.fn())
+        };
+    },
+    { virtual: true }
+);
+
+// Mock refreshApex module
+jest.mock(
+    '@salesforce/apex',
+    () => {
+        return {
+            refreshApex: jest.fn(() => Promise.resolve())
+        };
+    },
+    { virtual: true }
+);
+
+describe('c-view-to-refresh', () => {
+    afterEach(() => {
+        // The jsdom instance is shared across test cases in a single file so reset the DOM
+        while (document.body.firstChild) {
+            document.body.removeChild(document.body.firstChild);
+        }
+
+        // Prevent data saved on mocks from leaking between tests
+        jest.clearAllMocks();
+    });
+
+    // Helper function to wait until the microtask queue is empty. This is needed for promise
+    // timing when calling imperative Apex.
+    async function flushPromises() {
+        return Promise.resolve();
+    }
+
+    it('registers itself as refresh handler on connected callback', () => {
+        // Create component
+        const element = createElement('c-view-to-refresh', {
+            is: ViewToRefresh
+        });
+        document.body.appendChild(element);
+
+        // Validate if pubsub got registered after connected to the DOM
+        expect(registerRefreshHandler).toHaveBeenCalled();
+    });
+
+    it('invokes getTotalNumber onload', async () => {
+        // Create component
+        const element = createElement('c-view-to-refresh', {
+            is: ViewToRefresh
+        });
+        document.body.appendChild(element);
+
+        // Emit data from @wire
+        getTotalNumber.emit(10);
+
+        // Wait for any asynchronous DOM updates
+        await flushPromises();
+
+        // Check UI
+        const divEl = element.shadowRoot.querySelector('div.account-number');
+        expect(divEl.textContent).toBe('Number of accounts: 10');
+    });
+
+    it('invokes refreshApex when RefreshEvent is listened', async () => {
+        // Create component
+        const element = createElement('c-view-to-refresh', {
+            is: ViewToRefresh
+        });
+        document.body.appendChild(element);
+
+        // Emit data from @wire
+        getTotalNumber.emit(10);
+
+        // Fire a RefreshEvent
+        element.dispatchEvent(new RefreshEvent());
+
+        // Wait for any asynchronous DOM updates
+        await flushPromises();
+
+        // Check refreshApex has been called
+        expect(refreshApex).toHaveBeenCalled();
+    });
+
+    it('unregisters itself as refresh handler on disconnected callback', () => {
+        // Create component
+        const element = createElement('c-view-to-refresh', {
+            is: ViewToRefresh
+        });
+        document.body.appendChild(element);
+
+        document.body.removeChild(element);
+
+        // Validate if pubsub got registered after connected to the DOM
+        expect(unregisterRefreshHandler).toHaveBeenCalled();
+    });
+
+    it('is accessible', async () => {
+        // Create component
+        const element = createElement('c-view-to-refresh', {
+            is: ViewToRefresh
+        });
+        document.body.appendChild(element);
+
+        // Assign mock value for resolved Apex promise
+        getTotalNumber.mockResolvedValue(10);
+
+        // Wait for any asynchronous DOM updates
+        await flushPromises();
+
+        // Check accessibility
+        await expect(element).toBeAccessible();
+    });
+});

force-app/main/default/lwc/viewToRefresh/viewToRefresh.html

@@ -0,0 +1,18 @@
+<template>
+    <lightning-card title="ViewToRefresh" icon-name="standard:account">
+        <div class="slds-var-m-around_medium">
+            <template lwc:if={numOfAccounts.data}>
+                <div class="account-number">
+                    Number of accounts: {numOfAccounts.data}
+                </div>
+            </template>
+            <template lwc:elseif={numOfAccounts.error}>
+                <c-error-panel errors={numOfAccounts.error}></c-error-panel>
+            </template>
+        </div>
+
+        <c-view-source source="lwc/viewToRefresh" slot="footer">
+            Refresh a custom component when a Refresh View event is listened.
+        </c-view-source>
+    </lightning-card>
+</template>

force-app/main/default/lwc/viewToRefresh/viewToRefresh.js

@@ -0,0 +1,29 @@
+import { LightningElement, wire } from 'lwc';
+import getTotalNumber from '@salesforce/apex/AccountController.getTotalNumber';
+import {
+    registerRefreshHandler,
+    unregisterRefreshHandler
+} from 'lightning/refresh';
+import { refreshApex } from '@salesforce/apex';
+
+export default class ViewToRefresh extends LightningElement {
+    refreshHandlerID;
+
+    @wire(getTotalNumber)
+    numOfAccounts;
+
+    connectedCallback() {
+        this.refreshHandlerID = registerRefreshHandler(
+            this,
+            this.refreshHandler
+        );
+    }
+
+    disconnectedCallback() {
+        unregisterRefreshHandler(this.refreshHandlerID);
+    }
+
+    refreshHandler() {
+        refreshApex(this.numOfAccounts);
+    }
+}

force-app/main/default/lwc/viewToRefresh/viewToRefresh.js-meta.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
+    <apiVersion>60.0</apiVersion>
+    <isExposed>true</isExposed>
+    <targets>
+        <target>lightning__AppPage</target>
+    </targets>
+</LightningComponentBundle>

force-app/test/jest-mocks/lightning/refresh.js

@@ -1,10 +1,31 @@
 /**
  * Refresh Event base class
  */
-export const RefreshEventName = 'lightning__refreshevent';
-
+export const RefreshEventName = 'lightning__refresh';
 export class RefreshEvent extends CustomEvent {
     constructor() {
-        super(RefreshEventName, { bubbles: true, composed: true });
+        super(RefreshEventName, {
+            composed: true,
+            cancelable: true,
+            bubbles: true
+        });
     }
 }
+
+let eventHandler;
+let elementToRefresh;
+export const registerRefreshHandler = jest.fn((element, handler) => {
+    elementToRefresh = element;
+    eventHandler = handler;
+    window.addEventListener(
+        RefreshEventName,
+        eventHandler.bind(elementToRefresh)
+    );
+});
+
+export const unregisterRefreshHandler = jest.fn((id) => {
+    window.removeEventListener(
+        RefreshEventName,
+        eventHandler.bind(elementToRefresh)
+    );
+});