How to pass parameters from lightning component to controller?
In this tutorial we are going to learn how to pass parameters from Lightning component to controller vice versa.
By usingcomponent.get (v.attrinuteName) or component.find ("aura:id").get ("v.value") we can pass value from component to controller.
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How to Start Working with Jest to Test LWC
To start working with Jest, you need to install sfdx-lwc-jesttogether with its dependencies in each Salesforce project.
Prior to this, you have to install Node.js together with npm.
It is worth noting that when you install Node.js, npm installs as well.
From time to time, you may need to update npm.
Jest for Salesforce can be installed either with .
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How to Write Jest Test For LWC
1.
Start with Simple Jest Test
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What happens when lightning data service detects a change to a record?
If Lightning Data Service detects a change to a record or any data or metadata it supports, the components receive the new value.
The detection is triggered if:
- An Aura or Lightning web component mutates the record
The
Lightning Data Service cache entry expires and then a component built on
Lightning Data Service triggers a read.
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What is a lightning detection system?
This detects and counts the number of lightning strikes for use in determining the effectiveness of the current lightning protection system and/or an indicator for the possible need of a lightning protection system, surge protection, or additional grounding components.
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What is lightning Web Components (LWC)?
Lightning Web Components apply common standards pertaining to all web components to ensure smooth performance on browsers supported by Salesforce.
LWC is a code-based solution that can be easily set up and launched in the browser to improve productivity.
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Why Are Mocks Important For Jest Testing?
Let’s move on to the most interesting part: the mocks.
Mocks enable code testing (independent of the actual implementation of the called function), intercepting calls of functions and parameters, and configuration during testing of the returned values.
If the component method calls Apex controller method, you can’t go without mocks.
What’s new in t.
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Why Do LWC Require Testing?
Lightning Web Components apply common standards pertaining to all web components to ensure smooth performance on browsers supported by Salesforce.
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Why Use Jest For Lightning Web Components Testing?
The most popular frameworks for testing web components – not necessarily just in Lightning – are Jasmine, Mocha, and Jest.
Salesforce recommends using Jest because it’s extremely easy to write tests within this framework.
Jest is a JavaScript Testing framework that focuses on simplicity, and is tuned for projects based on:.
1) Node.
2) React.
3) TypeS.
