Handle Server Errors | Lightning Web Components and Salesforce Data | Salesforce Trailhead

Module: Lightning Web Components and Salesforce Data
Develop Lightning web components that interact with data in your Salesforce org.
Unit-3: Handle Server Errors
#salesforce #trailhead #codding
Solution of Salesforce Trailhead - Handle Server Errors

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LWC Code :

IdsUtils.js:-


/**
* Reduces one or more LDS errors into a string[] of error messages.
* @param errors
* @return {String[]} Error messages
*/
export function reduceErrors(errors) {
if (!Array.isArray(errors)) {
errors = [errors];
}

return (
errors
// Remove null/undefined items
.filter((error) => !!error)
// Extract an error message
.map((error) => {
// UI API read errors
if (Array.isArray(error.body)) {
return error.body.map((e) => e.message);
}
// UI API DML, Apex and network errors
else if (error.body && typeof error.body.message === 'string') {
return error.body.message;
}
// JS errors
else if (typeof error.message === 'string') {
return error.message;
}
// Unknown error shape so try HTTP status text
return error.statusText;
})
// Flatten
.reduce((prev, curr) => prev.concat(curr), [])
// Remove empty strings
.filter((message) => !!message)
);
}



IdsUtils.js-meta.xml:-

<?xml version="1.0" encoding="UTF-8"?>

<isExposed>false</isExposed>
</LightningComponentBundle>



contactList.html:-

<template>
<lightning-card>
<template if:true={contacts.data}>
<lightning-datatable key-field="Id" data={contacts.data} columns={columns}> </lightning-datatable>
</template>
<template if:true={errors}>
<p>{errors}</p>
</template>
</lightning-card>
</template>


contactList.js:-


import { LightningElement, wire } from "lwc";
import { reduceErrors } from "c/ldsUtils";

const COLUMNS = [
{
label: "First Name",
fieldName: FIRST_NAME_FIELD.fieldApiName,
type: "text"
},
{
label: "Last Name",
fieldName: LAST_NAME_FIELD.fieldApiName,
type: "text"
},
{ label: "Email", fieldName: EMAIL_FIELD.fieldApiName, type: "email" }
];

export default class ContactList extends LightningElement {
columns = COLUMNS;
@wire(getContacts)
contacts;

get errors() {
return this.accounts.error ? : [];
}
}


ContactColtroller.cls:-

public with sharing class ContactController {
@AuraEnabled(cacheable=true)
public static List<Contact> getContacts() {
// The following line is used only for the last challenge
throw new AuraHandledException('Forced error');
// return [SELECT FirstName, LastName, Email FROM Contact WITH SECURITY_ENFORCED ORDER BY LastName, FirstName];
}
}