How to align Lightning Button To Center, Right Or Left in LWC & Aura Components

How to align Lightning Button To Center, Right Or Left in LWC & Aura Components

salesforcepoint → Sunday, 20 September 2020

Lightning Button Alignment

In many cases we need button alignment to left, center or right. Event though we used correct slds classes, alignment will be not at expected position. In that cases we need to use "slds-clearfix" class for above div of the button, so that we can able to display lightning button at required place. 

Slds CSS class for center alignment:  slds-align_absolute-center

Slds CSS class for right alignment: slds-float_right

Slds CSS class for left alignment: slds-float_left

Button Alignment in LWC (Lightning Web Components)

ButtonAlignmentInLwc.html

<template>
    <div class="slds-clearfix">
        <lightning-button label="Left" class="slds-float_left"></lightning-button>
    </div>
    <div class="slds-clearfix">
        <lightning-button label="I am Center" class="slds-align_absolute-center"></lightning-button>
    </div>
    <div class="slds-clearfix">
        <lightning-button label="I am Right" class="slds-float_right"></lightning-button>
    </div>
</template>

Button Alignment In Lightning Aura Components:

ButtonAlignmentInAura.cmp

<aura:component >
    <div class="slds-clearfix">
        <lightning:button label="Left" class="slds-float_left"/>
    </div>
    <div class="slds-clearfix">
        <lightning:button label="I am Center" class="slds-align_absolute-center"/>
    </div>
    <div class="slds-clearfix">
        <lightning:button label="I am Right" class="slds-float_right"/>
    </div>
</aura:component>

Output

Validate LWC Input Data: How To Add Validations In Input Form

Validate LWC Input Data: How To Add Validations In Input Form

salesforcepoint → Tuesday, 8 September 2020

Hello folks, in this post we will see how to add validations in lwc input form and showing error message upon button click (most probably Save operation). In any input form we need to validate user entered data before commuting to database whether it is a insert/ update.

Also Check : Custom File Upload Component Along With New Record Creation

Example for Validate LWC Input Form Data: 

In below example we are going to create Contact form that contains First Name, Last Name, phone, email. Here we need to add validations like Name, email should be mandatory.

lwcValidateInputForm.html

<template>  
    <div class="slds-box slds-theme_default">  
      <div class="slds-m-around_medium">  
        <lightning-input type="text" max-length=12 required label="Name" onchange={onNameChange}></lightning-input>  
        <lightning-input type="tel" label="Phone" onchange={onPhoneChange}></lightning-input>
        <lightning-input type="email" required label="Email" onchange={onEmailChange}></lightning-input>    
      </div>  
      <div>  
        <center>  
        <lightning-button label="Save" onclick={saveContact}>  
        </lightning-button>  
        </center>  
      </div>  
    </div>  
  </template>

LwcValidateInputForm.js

import { LightningElement, track } from 'lwc';
export default class LwcValidateInputForm extends LightningElement {
    @track name;
    @track phone;
    @track email;

    onNameChange(event) {
        this.name = event.detail.value;
    }
    onPhoneChange(event) {
        this.phone = event.detail.value;
    }
    onEmailChange(event) {
        this.email = event.detail.value;
    }

    saveContact() {
        const isInputsCorrect = [...this.template.querySelectorAll('lightning-input')]
            .reduce((validSoFar, inputField) => {
                inputField.reportValidity();
                return validSoFar && inputField.checkValidity();
            }, true);
        if (isInputsCorrect) {
         //perform success logic

        }
    }
}

Output:

If we need to make any field required then we need to mention "required" attribute in lightning-input tag so that we can show error message upon save button click. Once user click on save button, we are validating each filed by querying with the lightning-input. By using checkValidity() function we are checking each values entered in form. If all values are in required format then we can write further logic.

If we don't want standard error message, we can set custom message with the help of below attributes.


message-when-value-missing: Used for assigning custom error message when value missed on required field.
message-when-too-short: Used for assigning custom error message when entered value not meeting expected length. For this we need to add one more attribute i.e min-length.
message-when-too-long: Used for assigning custom error message when entered value exceeds expected length. For this we need to add one more attribute i.e max-length.
message-when-pattern-mismatch: Used for assigning custom error message when entered value not matching the expected pattern. This is used for email, url, phone, password, text. For this we need to add one more attribute i.e "pattern".

Reference: https://developer.salesforce.com/docs/component-library/bundle/lightning-input/specification

How to Use Safe Navigation Operator (?.) in Salesforce Apex | Winter 21 Release Notes

How to Use Safe Navigation Operator (?.) in Salesforce Apex | Winter 21 Release Notes

salesforcepoint → Monday, 31 August 2020

How to Use the Safe Navigation Operator in Apex

Hello guys, as part of salesforce winter 21 release, salesforce introduced Safe Navigation Operator( (?.) to avoid null pointer exceptions in apex. This is very useful feature for developers. If we need to check something (whether it is a object, map, list..) should not be null then we will write (?.) at the end.  If the left side of the expression(?.) is null, then right side is not evaluated and result will be null.

Till now we used != null condition to check object is not null like below.

if (object!= null){
   string s= object.fieldName;
}

we can write above code by using safe navigation operator like below

string s= object?.fieldName;

Example: In this example we have a accountIdAccountMap, it contains account id as key, account record as value. We need to get name of the account.

string accountName = accountIdAccountMap.get(accId).Name; 
// this will return null pointer exception if accId not available in the map.

if account not exist on map we will get null pointer exception because we accessing null object for fetching name.

Traditional approach to avoid above null pointer exception:

if(accountIdAccountMap.get(accId) != null) {
 accountName = accountIdAccountMap.get(accId).Name;
}

OR

if(accountIdAccountMap.containsKey(accId)) {
 accountName = accountIdAccountMap.get(accId).Name;
}

By using Safe Navigation operator:

string Account Name = accountIdAccountMap.get(accId)?.Name;

if we need to check whether map is not null then we can write

accountIdAccountMap?.get(accId)?.Name;

LWC Combobox Picklist : Get Pick-list Values (With / Without Default Record Type Id)

LWC Combobox Picklist : Get Pick-list Values (With / Without Default Record Type Id)

salesforcepoint → Friday, 28 August 2020

Fetching and Displaying Picklist Values In Lightning Web Components (LWC) : 

By using "lightning-combobox" tag we can display picklist values in Lwc markp. In Lightning Aura Components if we want to display picklist values, we need to hit  apex server and needs write logic to fetch picklist values by using dynamic schema. Even though we are write apex logic, we could not get picklist values based on recordtype name or recordTypeId, every time it shows all the values irrespective of record type. But in lightning web components we have a great privilege that don't need to hit apex for fetching picklist values. In Lwc we can get values based on recordtype name as well.

By importing getPicklistValues or getPicklistValuesByRecordType from "lightning/uiObjectInfoApi" we can get picklist values in LWC JavaScript. recordTypeId is required parameter for both of these functions.

Get picklist values based on recordtypeId In Salesforce LWC component

lwcPicklistWithRecordtype.js

import { LightningElement,wire } from 'lwc';
import { getPicklistValues } from 'lightning/uiObjectInfoApi';
import STAGE from '@salesforce/schema/Opportunity.StageName';

export default class LwcPicklistWithRecordtype extends LightningElement {
    @wire(getPicklistValues,
        {
            recordTypeId: '01228000000XckuAAC', //pass id dynamically
            fieldApiName: STAGE
        }
    )
    stageValues;
}

lwcPicklistWithRecordtype.html

<template>
    <div class="slds-box">
        <template if:true={stageValues.data}>
            <lightning-combobox name="progress" label="Opportunity Stage" value={value} 
                options={stageValues.data.values} onchange={handleChange}>
            </lightning-combobox>
        </template>
    </div>
</template>

Output

Get picklist values if we don't have recordtypes in Object In Lightning Web Components (LWC)

If  object does not have record type's then use the defaultRecordTypeId property, this can be fetch from  getRecordUi or getObjectInfo. See below example.

lwcPicklistWithoutRecordtype.js

import { LightningElement,wire } from 'lwc';
import { getPicklistValues } from 'lightning/uiObjectInfoApi';
import LeadSource from '@salesforce/schema/Contact.LeadSource';
import { getObjectInfo } from 'lightning/uiObjectInfoApi';
import CONTACT_OBJECT from '@salesforce/schema/Contact';

export default class LwcPicklistWithoutRecordtypeextends LightningElement {
    @wire(getObjectInfo, { objectApiName: CONTACT_OBJECT })
    contactInfo;

    @wire(getPicklistValues,
        {
            recordTypeId: '$contactInfo.data.defaultRecordTypeId',
            fieldApiName: LeadSource
        }
    )
    leadSourceValues;
}

lwcPicklistWithoutRecordtype.html

<template>
    <div class="slds-box">
        <template if:true={leadSourceValues.data}>
            <lightning-combobox name="progress" label="Lead Source" value={value}
                options={leadSourceValues.data.values} onchange={handleChange}>
            </lightning-combobox>
        </template>
    </div>
</template>

Outut:

LWC refreshApex: How To Refresh Page Data in Lightning Web Component

LWC refreshApex: How To Refresh Page Data in Lightning Web Component

salesforcepoint → Wednesday, 12 August 2020

refreshApex in lwc: 

In this post we are going to see how to use refreshApex() function in Lightning web Components with example. If we need to refresh lwc page data we should use refreshApex. We know that wire provisions data, if we use wire function or wire parameter to display data in front end, that data will not be changed or updated unless input parameters changed which are used in wire. By using refreshApex in lwc we can update wire function or wire parameter data, so that component values will be re-rendered.

We need to import refreshApex function from salesforce/apex class, so that we can use it.

refreshApex lwc example:

In below example we are displaying latest five account records in lwc data table and we have a radio button to select the record. Once we click on Delete button selected record will be deleted from apex database but not on table. So we use refreshApex() function (refreshApex(this.wiredAccountList)) to fetch latest data from server on delete success in deleteRecord  function. We created "wiredAccountList" property to assign result of wire function "accList" and this property used in resfreshApex function.

AccountController.cls

public with sharing class AccountController {
    @AuraEnabled(cacheable=true)
    public static List  getAccountList(){
        return [SELECT Id, Name,Phone,Industry FROM Account order by createddate desc LIMIT 5];
    }
}

lwcRefreshApex.js

import { LightningElement, wire, track } from 'lwc';
import { deleteRecord } from 'lightning/uiRecordApi';
import { refreshApex } from '@salesforce/apex';

import getLatestAccounts from '@salesforce/apex/AccountController.getAccountList';
const COLS = [
  { label: 'Name', fieldName: 'Name', type: 'text' },
  { label: 'Stage', fieldName: 'Phone', type: 'text' },
  { label: 'Amount', fieldName: 'Industry', type: 'text' }
];
export default class LwcRefreshApex extends LightningElement {
  cols = COLS;
  @track selectedRecord;
  @track accountList = [];
  @track error;
  @track wiredAccountList = [];

  @wire(getLatestAccounts) accList(result) {
    this.wiredAccountList = result;

    if (result.data) {
      this.accountList = result.data;
      this.error = undefined;
    } else if (result.error) {
      this.error = result.error;
      this.accountList = [];
    }
  }

  handelSelection(event) {
    if (event.detail.selectedRows.length > 0) {
      this.selectedRecord = event.detail.selectedRows[0].Id;
    }
  }
  deleteRecord() {
    deleteRecord(this.selectedRecord)
      .then(() => {
        refreshApex(this.wiredAccountList);
      })
      .catch(error => {
      })
  }
}

lwcRefreshApex.html

<template>  
    <lightning-card title="Latest Five Accounts">  
      <lightning-button slot="actions" label="Delete Account" onclick={deleteRecord}></lightning-button>  
        <lightning-datatable  
        data={accountList} columns={cols} key-field="Id" 
        max-row-selection="1" onrowselection={handelSelection} >  
        </lightning-datatable>  
    </lightning-card>  
  </template>

Output:

LWC refreshApex() not working?

Make sure that the input parameter in the refreshApex should be total result of wire function but not only data, i.e in many cases we return { error, data } in wire function and we use data only for refresh apex, in this case refreshApex will not work. We must entire result (check above example where we return result not { error, data } and that is assigned to one dummy variable i.e wiredAccountList and that is used as input parameter for refreshApex().

Pass Data/Values From Child LWC Component To Parent LWC Using Custom Event

Pass Data/Values From Child LWC Component To Parent LWC Using Custom Event

salesforcepoint → Sunday, 9 August 2020

How to Pass Values From Child to Parent component in LWC

In this post we will see how to pass data from child to parent in Lwc. If we want to fire parent lightning web component function from child LWC component function when child function fired or if we need pass data from child LWC component to parent Lightning web component then we need to use custom events. Unlike aura component we don't to create separate event in lightning web components.

Steps for child to parent communication in LWC:
1. Define a custom event in child lightning web component.
2. Add values (which needs to pass to parent lwc) to event. (optional)
3. Dispatch the event.
Example:

const lwcEvent= new CustomEvent('eventname', {
   detail:{varible1:value, varible2 : value} 
  });
 this.dispatchEvent(lwcEvent);

Here eventName is user defined key word for event, which is going to use in child component tag in parent component. Make sure that event name should not be starts with "on" word.
4 . Handle event on parent lightning web component with the "oneventname" handler function. Here oneventname is the dispathed event in child component(see above code), 'on' should be added before event name.

<c-child-lwc-component oneventName={handleEvent}></c-child-lwc-component>

5. By using event.detail.variableName we will get value which is passed from child lwc.

Example Scenario for Passing values from Child Lightning web component to Parent Lightning web component.

In Below example we have a child component(lwcChild) where we are showing list of account records. In parent component(lwcParent) we are referring child component. on click of record in table, we are firing custom event and dispatching the event with selected account id and then we are showing details of respective account in parent component.

AccountController.cls

public with sharing class AccountController {
        @AuraEnabled(cacheable=true)
        public static List  getAccountList(){
        return [SELECT Id, Name,Phone,Industry FROM Account WITH SECURITY_ENFORCED LIMIT 10];
    }
}

Create new lightning web component: lwcChild
lwcChild.js

import { LightningElement, api } from 'lwc';
export default class LwcChild extends LightningElement {
    @api accountList;
    handleAccountClick(event) {
        let selectedAccId = event.currentTarget.getAttribute("data-key");
        //custom event
        const passEvent = new CustomEvent('accountselection', {
            detail:{recordId:selectedAccId} 
        });
       this.dispatchEvent(passEvent);
    }
}

lwcChild.html

<template>
    <table class="slds-table slds-table_bordered">
        <thead>
            <tr>
                <th>Name</th>
                <th>Phone</th>
                <th>Industry</th>
            </tr>
        </thead>
        <tbody>
            <template if:true={accountList}>
                <template for:each={accountList} for:item="acc">
                    <tr key={acc.Id} data-key={acc.Id} onclick={handleAccountClick}>
                        <td>{acc.Name}</td>
                        <td>
                            <lightning-formatted-phone value={acc.Phone}></lightning-formatted-phone>
                        </td>
                        <td>{acc.Industry}</td>
                    </tr>
                </template>
            </template>
        </tbody>
    </table>
</template>

Create new lightning web component: lwcParent
lwcParent.js

import { LightningElement,wire,track } from 'lwc';
import getAccountList from '@salesforce/apex/AccountController.getAccountList';

export default class LwcParent extends LightningElement {
    @track selectedAccountId;
    @wire(getAccountList) accountList;  
    onAccountSelection(event){
        this.selectedAccountId = event.detail.recordId;
    }
}

lwcParent.html

<template>
    <div class="row">

        <div class="column" style="float: left; width: 70%; padding: 10px;">
            <div class="slds-box">
                <template if:true={accountList.data}>
                    <c-lwc-child account-list={accountList.data} onaccountselection={onAccountSelection}></c-lwc-child>
                </template>
            </div>
        </div>

        <div class="column" style="float: right; width: 30%; padding: 10px;">
                <div class="slds-box">
                    <div slot="actions">
                        <div class="slds-box">
                            Selected Account Information
                        </div>
                    </div>
                    <lightning-record-view-form record-id={selectedAccountId} object-api-name="Account">
                        <div class="slds-box slds-them_shade">
                            <lightning-output-field field-name="Name"></lightning-output-field>
                            <lightning-output-field field-name="Phone"></lightning-output-field>
                            <lightning-output-field field-name="Industry"></lightning-output-field>
                        </div>
                    </lightning-record-view-form>
                </div>
            </div>
    </div>
</template>

Output

Salesforce Lightning Web Components - LWC Interview Questions

Salesforce Lightning Web Components - LWC Interview Questions

salesforcepoint → Monday, 3 August 2020

Latest LWC Interview Questions 

1. What is LWC?
2. Difference between Lightning web components and Lightning aura components?
3. How to fire child lightning web component function from parent LWC component?
4. How to pass data from child LWC component to parent lightning aura component?
5. How to get dynamic record id in LWC? Answer: By using @api recordId; property we can dynamically fetch current record id in lightning web component.
6. What is difference between const, let and var types?
7. What's the difference between wire function imperative functon?
8. Is it possible to use lwc component in quick action?
9. Why wire function gets invoked multiple times?
10. What is the importance of Constructor in LWC?
11. What are the differences between @api, @wire @track lwc decorators?
12. What is the purpose of refreshApex() in LWC? Ex: https://www.salesforcepoint.com/2020/06/lwc-data-table-with-checkbox-example.html
13.  What is the meta data name of Lightning web component?  Ans: LightningComponentBundle
14. When will we get "Cannot Assign To Read Only Property Error" In LWC? How can we resolve that issue?
15. Can we refer lightning aura component inside Lightning web component?

Hello folks post your answers for above mentioned Lightning web component interview questions? 

Other LWC tutorials click here: https://www.salesforcepoint.com/search/label/LWC

How To Fix Cannot Assign To Read Only Property Error In LWC-Lighting Web Components

How To Fix Cannot Assign To Read Only Property Error In LWC-Lighting Web Components

salesforcepoint → Sunday, 2 August 2020

Fix Cannot Assign To Read Only Property Error In LWC In Lightning web components 

If we are trying to update public (@api) property or wired property in JavaScript function we usually get this issue. For resolving this issue, we need to clone that property to new variable and update it. After updating assign temporary variable to actual property.

 Example Problem Code:

 allCheckBoxChange(event) {
        for (let j = 0; j < this.allOppList.length; j++) {
            this.allOppList.isChecked = event.detail.checked;
        }
    }

In above code "allOppList" is the data of wired property. When allCheckBoxChange() fynction gets invoked we will get below error Uncaught TypeError: Cannot assign to read only property '0' of object '[object Array]'

Solution Code:

 allCheckBoxChange(event) {
        let tempAllRecords = Object.assign([], this.allOppList);
        for (let j = 0; j < this.allOppList.length; j++) {
                let tempRec = Object.assign({}, tempAllRecords[j]);
                tempRec.isChecked = event.detail.checked;
                tempAllRecords[j] = tempRec;
        }
        this.allOppList = tempAllRecords;
}

In above code we are cloning wired property "allOppList" to new temporary variable tempAllRecords and after update, assigning temporary list to allOppList. In for loop we are updating every record of allOppList, so we are cloning every record and updating the cloned record and assigning back to actual record. So that we can avoid read only property issue.

 Note: Object.assign() function is the one of cloning method in JavaScript.

How To Display [Object Object] In console.log or Alert in JavaScript (LWC & Lightning Aura Components)

How To Display [Object Object] In console.log or Alert in JavaScript (LWC & Lightning Aura Components)

salesforcepoint → Saturday, 1 August 2020

Display [Object Object] As String In JavaScript: 

In JavaScript if we trying to print other than primitive type variables in console.log or alert, then it will returns [Object Object]. If its return output as [Object Object], we can't know output as expected or not.

By using JSON.stringify() function we can print output in string format. JSON.stringify() is a predefined JavaScript function, it takes object as a input parameter and returns json string if object in JavaScript specific object structure.

Example:  Display Object as String in js

var cObj = { name: "Salesforec", age: 10, city: "CA" };
console.log("cObj===>"+cObj ); //output : cObj===>"+[Object Object]
console.log("cObj in String Format===>"+JSON.stringify(cObj) );
// output: cObj in String Format===> { name: "Salesforec", age: 10, city: "CA" };

How To Get Record Id From aura:iteration In Lightning Component

How To Get Record Id From aura:iteration In Lightning Component

salesforcepoint → Sunday, 26 July 2020

Fetch Selected Record Id From Iteration Lightning Aura Component:

If we need to fetch record id or some element from aura:iteration we can use html property dataset. By using this html dataset attributes we can pass id from component to JavaScript function when some event occurs. The name of a custom data element starts with data-. By using html elements, we can get not only id but we can get any element that we set for data element (ex: data-id, data-name) in lightning component.

Example code for fetching record id in aura iteration:

In below example we are fetching all the student records, In aura iteration  for div element we added data-id ="{!student.Id}". on click on student we are passing selected student id to JavaScript function handleSelect by using event.target.dataset.id. If we need to pass other attribute then we can create new data attribute, for example if we need to pass name of selected student then we add new attribute data-name and in js function we can get that attribute by using event.target.dataset.name.

StudentController.cls

 public class StudentController {  
   @AuraEnabled  
   public static List<Student__c> getStudentList() {  
     List<Student__c> studentList = [SELECT Id, Name FROM Student__c];  
     return studentList;  
   }  
 }  

StudentList.cmp

 <aura:component implements="force:appHostable,flexipage:availableForAllPageTypes,  
               flexipage:availableForRecordHome,force:hasRecordId,  
               force:lightningQuickAction" controller="StudentController"  
         access="global" >  
   <aura:attribute name="studentList" type="List" />  
   <aura:handler name="init" action="{!c.fetchStudentList}" value="{!this}" />  
   <aura:iteration items="{!v.studentList}" var="student">  
     <div data-id ="{!student.Id}" class="slds-box slds-theme_shade" onclick="{!c.handleSelect}">  
       {!student.Name}  
     </div>  
   </aura:iteration>  
 </aura:component>  

StudentListController.js

 ({  
   fetchStudentList : function(component, event, helper) {  
     var action = component.get("c.getStudentList");  
     action.setCallback(this, function(response) {  
       var state = response.getState();  
       if(state === 'SUCCESS') {  
         var studentList = response.getReturnValue();  
         component.set("v.studentList",studentList);  
       }  
       else {  
         alert('Error in getting data');  
       }  
     });  
     $A.enqueueAction(action);  
   },  
   handleSelect: function(component, event, helper) {  
     var selectedId = event.target.dataset.id;  
     alert(selectedId)  
   }  
 })  

Output:

Navigate/Redirect To Record Page Based On Record Id In LWC (Lightning Web Component)

Navigate/Redirect To Record Page Based On Record Id In LWC (Lightning Web Component)

salesforcepoint →

Redirect or Navigate to salesforce object record detail page in Lwc:

In many scenarios we need to redirect to record detail page upon successful record save or update into database. Below code is helpful for navigate to sobject record page in Lightning web components. For navigating to record page in lightning experience we need to use lightning navigation service.

Implementation steps to navigate/Redirect to record page in LWC components: 

For Using navigation service in Lwc we need to import NavigationMixin  from lightning/navigation base.

import { NavigationMixin } from 'lightning/navigation';

Then we need to Apply the NavigationMixin function to your component’s base class.

export default class MyCustomElement extends NavigationMixin(LightningElement) {
}

Add new function to redirect to record page in JavaScript and specify object api name, record id in objectApiName and recordId attributes. Call this function wherever you want (Like after success return from apex).

navigateToRecordPage() {
        this[NavigationMixin.Navigate]({
            type: 'standard__recordPage',
            attributes: {
                recordId: 'recordId',
                objectApiName: 'ObjectApiName',
                actionName: 'view'
            }
        });
}

Example: in below example we create new button, once we click on button tit should redirect to specified account record page.

redirectToRecordPage.html

 <template>  
   <div class="slds-box slds-theme_shade">  
     <lightning-button label="Navigate To Account" onclick="{navigateToAccountPage}"> </lightning-button>  
   </div>  
 </template>  

redirectToRecordPage.js

 
import { LightningElement } from 'lwc';
import { NavigationMixin } from 'lightning/navigation';

export default class RedirectToRecordPage extends NavigationMixin(LightningElement) {

    navigateToAccountPage() {
        this[NavigationMixin.Navigate]({
            type: 'standard__recordPage',
            attributes: {
                recordId: '0010K000027o6pWQAQ',
                objectApiName: 'Account',
                actionName: 'view'
            }
        });
 }
}

Output:

How To Display LWC Component In Quick Action

How To Display LWC Component In Quick Action

salesforcepoint → Saturday, 25 July 2020

Lighting Web Component (LWC)  In Quick action 

We can't show lwc component directly in lightning quick action, if we need to show Lightning web component in quick action then we need to create simple lightning aura component and in that we need to refer Lwc component (check example code below). Then we can show lwc component content in quick action button.

Showing LWC Component content in Lightning Quick Action 

Step 1: Create new lightning web component : lwcAction

lwcAction.html

 <template>  
   <div class="slds-box slds-theme_shade">  
     <P> I am from LWC Component</P>  
   </div>  
 </template>  

Step2: Create new lightning aura component LwcInAuraQuickAction

LwcInAuraQuickAction.cmp

 <aura:component implements="flexipage:availableForAllPageTypes,  
               flexipage:availableForRecordHome,  
               force:hasRecordId,force:lightningQuickAction" access="global" >  
   <c:lwcAction />  
 </aura:component>  

Add it to quick action button

Go to Object Manger--> Buttons, Links, and Actions --> New Action 

--> Select Lightning Component as Action Type

--> Select LwcInAuraQuickAction as Lightning Component

--> Give "LWC ACtion" as Label and save.

--> Add this "LWC Action" button to page layout.

Output:

LWC Modal: How To Create/Show Modal Popup in LWC

LWC Modal: How To Create/Show Modal Popup in LWC

salesforcepoint →

How Display Content In Modal Popup window using Lightning Web Components (LWC):

If we need to show something in modal dialog we need to use predefined slds class "slds-modal" . LWC modal has three section i.e header, body(modal content), footer. If we use "slds-modal__header" class we can show sticky header in modal window and by using "slds-modal__footer" class we can show sticky footer where usually show save, cancel buttons. By using "slds-modal__content" class we can show modal body content.

In below example code we are showing lightning button, on click of that button, modal popup window will be opened.

Code for Lightning Web Component (LWC) Modal Popup 

Create new lightning web component: lwcModalPopup

lwcModalPopup.html

 <template>  
   <div class="slds-box slds-theme_shade">  
     <lightning-button label="Show Modal" onclick={showModal}> </lightning-button>  
   </div>  
   <template if:true={openModal}>  
     <div class="slds-modal slds-fade-in-open slds-backdrop">  
       <div class="slds-modal__container">  
         <!------HEADER Section-->  
         <div class="slds-modal__header">  
           <lightning-button-icon icon-name="utility:close" alternative-text="Close this window" size="large"  
             variant="bare-inverse" onclick={closeModal} class="slds-modal__close">  
           </lightning-button-icon>  
           <h2>Welcome To SalesforcePoint.com</h2>  
         </div>  
         <!------Body Section-->  
         <div class="slds-modal__content slds-p-around_medium">  
           <center>  
             <P>Hello guys, welcome to salesforcepoint.com. <br>  
               This is the basic lightning web component Modal popup.  
             </P>  
           </center>  
         </div>  
         <!------Footer Section-->  
         <div class="slds-modal__footer">  
           <lightning-button icon-name="utility:close" label="close" variant="brand" onclick={closeModal}>  
           </lightning-button>  
         </div>  
       </div>  
     </div>  
   </template>  
 </template>  

lwcModalPopup.js

import { LightningElement,track } from 'lwc';
export default class LwcModalPopup extends LightningElement {
    @track openModal = false;
    showModal() {
        this.openModal = true;
    }
    closeModal() {
        this.openModal = false;
    }
}

Deploy the modal component and add it lightning page.

Output:

Output of LWC Modal component

Create Calculator Using Lightning Web Component(LWC)

Create Calculator Using Lightning Web Component(LWC)

salesforcepoint →

Simple LWC Calculator

In this we are going to see how to create or build simple lightning web component calculator  with functions like 

• How to add two numbers in Lwc.
• How to subtract two numbers in Lwc. 
• Division of two numbers in Lwc.
• Multiplication of two numbers in Lwc.

Steps to create Lightning Web Component Calculator

Step1 : Create New Lightning Web component with name: calculatorInLwc.

calculatorInLwc.html

 <template>  
    <div class="slds-box slds-theme_shade">  
     <lightning-input type="number" name="input2" label="Number 1" onchange={handleNumberOeChange} value={firstNumber}></lightning-input>  
     <lightning-input type="number" name="input2" label="Number 2" onchange={handleNumberTwoChange} value={secondNumber}></lightning-input>  
   </div>  
   <div class="slds-box slds-theme_shade">  
     <b>Output value is : </b>  
      <P>{resultValue}</p>  
   </div>  
    <div class="slds-box slds-theme_shade">  
     <lightning-button label="Addition" onclick={addition}> </lightning-button>  
     <lightning-button label="Multification" onclick={multification}> </lightning-button>  
     <lightning-button label="Subtraction" onclick={subtraction}> </lightning-button>  
     <lightning-button label="Divison" onclick={division}> </lightning-button>  
    </div>  
 </template>  

calculatorInLwc.js

import { LightningElement, track } from 'lwc';
export default class CalculatorInLwc extends LightningElement {
    @track firstNumber;
    @track secondNumber;
    resultValue;
    handleNumberOeChange(event) {
        this.firstNumber = parseInt(event.target.value);
    }
    handleNumberTwoChange(event) {
        this.secondNumber = parseInt(event.target.value);
    }
    addition() {
        this.resultValue = parseInt(this.firstNumber) + parseInt(this.secondNumber);
    }
    multification() {
        this.resultValue = this.firstNumber * this.secondNumber;
    }
    subtraction() {
        this.resultValue = this.firstNumber - this.secondNumber;
    }
    division() {
        this.resultValue = this.firstNumber / this.secondNumber;
    }
}

Step2: Add this lwc component to lightning page.

Add calculator Lightning web competent to lightning page in app builder.

Output:

Populate Preselected Checkbox for Records/Rows On LWC Lightning Data Table Using Wrapper Class

Populate Preselected Checkbox for Records/Rows On LWC Lightning Data Table Using Wrapper Class

salesforcepoint → Sunday, 19 July 2020

Lightning Data Table with Pre populated selected records in Lightning Web Components   

In some scenarios we need auto populate selected checkbox for records in lightning-datatable on page load. In this post we also covered how to use wrapper class in Lightning web components (LWC).Let's see how to populate preselected rows in LWC data table.

Also Check: How To Add Hyper Link For Name Column In lightning-datatable in LWC

We have a key-field attribute in lightning-datatable  tag which is unique for every row in the table and based on this field only we can populate pre selected checkbox in data table. By using "selected-rows" attribute we can set the on load selected records in lightning-datatable, this is a array of unique key-field values. As per the requirements we set this attribute value in code.

Example for preselected rows/records in LWC data table:

Display all opportunity records and all these records should be pre selected.

Step1: Create Apex class: OpportunityController.

public with sharing class OpportunityController {  
   @AuraEnabled(cacheable=true)  
   public static oppWrapper getOpportunityRecords(){  
     oppWrapper ow = new oppWrapper();  
     ow.oppList = [SELECT Id, Name, StageName,Amount From Opportunity LIMIT 100];  
     Set<Id> selectedOppIdSet = new Set<Id>();  
     for(Opportunity opp: ow.oppList){  
       selectedOppIdSet.add(opp.Id);  
     }  
     ow.selectedIdSet = selectedOppIdSet;  
     return ow;  
   }  
      public class oppWrapper{  
     @AuraEnabled public List<opportunity> oppList {get; set;}  
     @AuraEnabled public set<Id> selectedIdSet {get; set;}  
   }  
 }  

Step2: Create New lightning web component: preSelectedLightningDataTable.

preSelectedLightningDataTable.js

import { LightningElement,track,wire } from 'lwc';
import getOpportunityList from '@salesforce/apex/OpportunityController.getOpportunityRecords';
const COLS=[
    {label:'Name',fieldName:'Name', type:'text'},
    {label:'Stage',fieldName:'StageName', type:'text'},
    {label:'Amount',fieldName:'Amount', type:'currency'}
];
export default class PreSelectedLightningDataTable extends LightningElement {
    oppList;
    cols = COLS;
    @track preSelectedRows;

    @wire(getOpportunityList)
    getOpportunityList(result){
        if(result.data) {
            this.oppList=result.data.oppList;
            this.preSelectedRows = result.data.selectedIdSet;
            this.errorList=undefined;
        }else if(result.error){
            this.oppList=undefined;
            this.errorList=result.error;
        }
    }
}
 

preSelectedLightningDataTable.html

<template>  
   <lightning-card title="Opportunity Records">  
     <div class="slds-box">  
       <lightning-datatable selected-rows={preSelectedRows}  
       data={oppList} columns={cols} key-field="Id">  
       </lightning-datatable>  
     </div>  
   </lightning-card>  
 </template>  

Output: Data Table with Pre populated selected checkbox records in Lightning Web Components.