How To Make Salesforce LWC work only for New Cases and Not on Existing cases

Question

I have a requirement where LWC component is fired everytime when a case is opened,I want to change LWC component to work only for NEW cases,what changes needs to be done in the LWC to make it work only for specific case types which are in NEW status

Here is JS code

    import { LightningElement } from 'lwc';
    import {ShowToastEvent} from 'lightning/platformShowToastEvent';

     export default class CaseTypeInformation extends LightningElement {


    connectedCallback() {
        var toast = new ShowToastEvent({
                 'title': 'Case Type Level 1, level 2 and level 3 fields ',
                 'message': 'must be selected before saving'
             });
             this.dispatchEvent(toast);
       }

    }

here is HTML

    <template>

    </template>

here is metaxml

     <?xml version="1.0" encoding="UTF-8"?>
     <LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiVersion>52.0</apiVersion>
    <isExposed>true</isExposed>
    <masterLabel> CaseType Levels Info Component</masterLabel>
    <description> CaseType Levels Info Component.</description>
    <targets>
      <target>lightning__RecordPage</target>
      <target>lightning__AppPage</target>
      <target>lightning__HomePage</target>
     </targets>
    </LightningComponentBundle>

What does "fired" mean? Where is this LWC exposed in the user interface? — David Reed
– David Reed, Commented Nov 17, 2021 at 18:41
with fired meant LWC component is displayed on CASE page record ,so each time user opens case this LWC on case page record is displayed even on existing case records,need a way to make this component get displayed only on NEW case records — Carolyn Cordeiro
– Carolyn Cordeiro, Commented Nov 17, 2021 at 19:04
Once the record is saved, it's not new. Are you overriding the Record Create action? — David Reed
– David Reed, Commented Nov 17, 2021 at 20:05
No its a very basic LWC which displays justa a Toastmessage on Cases ,havent overridden any action up until now — Carolyn Cordeiro
– Carolyn Cordeiro, Commented Nov 17, 2021 at 20:40

eyescream · Accepted Answer · 2021-11-21 18:45:35Z

Few ways to do it.

Ignore LWC completely. Does it have to be a "toast" at all? You could drop to the page a Rich Text Area field, put some text in red and use conditional display rules. Job done, zero code.

Similar - still use your component as is, but use the component visibility rules to make it display (run) only on New Cases.
Edit your component to be something like this

import { LightningElement, api, wire } from 'lwc';
import { ShowToastEvent } from 'lightning/platformShowToastEvent';
import { getRecord } from 'lightning/uiRecordApi';
import CASE_STATUS_FIELD from '@salesforce/schema/Case.Status';

export default class CaseTypeInformation extends LightningElement {
    @api recordId;

    @wire(getRecord, { recordId: '$recordId', fields: [CASE_STATUS_FIELD] }) wiredCase({ error, data }){
        if(data && data.fields.Status.value === 'New'){
            this.dispatchEvent(new ShowToastEvent({
                'title': 'Case Type Level 1, level 2 and level 3 fields ',
                'message': 'must be selected before saving'
            }));
        }
    }
}

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