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Learning Vue.js 2

You're reading from   Learning Vue.js 2 Learn how to build amazing reactive web applications easily with Vue.js

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Product type Paperback
Published in Dec 2016
Publisher Packt
ISBN-13 9781786469946
Length 334 pages
Edition 1st Edition
Languages
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Author (1):
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Olga Filipova Olga Filipova
Author Profile Icon Olga Filipova
Olga Filipova
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Table of Contents (11) Chapters Close

Preface 1. Going Shopping with Vue.js FREE CHAPTER 2. Fundamentals ā€“ Installing and Using 3. Components ā€“ Understanding and Using 4. Reactivity ā€“ Binding Data to Your Application 5. Vuex ā€“ Managing State in Your Application 6. Plugins ā€“ Building Your House with Your Own Bricks 7. Testing ā€“ Time to Test What We Have Done So Far! 8. Deploying ā€“ Time to Go Live! 9. What Is Next? A. Solutions to Exercises

Exercises for chapter 3

Exercise 1

When we were rewriting the shopping list application using simple components, we lost the application's functionality. The exercise suggests using an events emitting system in order to bring the functionality back.

The code we ended up with in this section was looking similar to what is in the chapter3/vue-shopping-list-simple-components folder.

Why doesn't it work? Check the devtools error console. It states the following:

[Vue warn]: Property or method "addItem" is not defined on the instance but referenced during render. Make sure to declare reactive data properties in the data option.
(found in component <add-item-component>)

Aha! This happens because inside add-item-template we are calling theĀ addItem method which does not belong to this component. This method belongs to the parent component, and of course, the child component does not have access to it. What should we do? Let's emit events! We already know how to...

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