What is the most efficient way to enable seamless communication between sibling components in Vue.js 2?

Just starting out with Vue.js 2 and I'm really enjoying it so far despite being new to it. Currently using the latest version.

I've begun working on my first larger application and ran into a scenario right off the bat where I have a main app component with 2 different sibling components nested inside.

<template>

    <div>
        <comp1></comp1>
        <comp2></comp2>
    </div>

</template>

<script>

    import Comp1 from './Comp1'
    import Comp2 from './Comp2'

    export default
    {
        components:
        {
            Comp1,
            Comp2
        },
        data: function()
        {
            return {
                
            }
        }
    }

</script>

This is how Comp1 is structured:

<template>
    
    <div>
        <ul>
            <li @click="doClick(data)">Component 1</li>
        </ul>
    </div>

</template>

<script>
    
    export default
    {
        data: function()
        {
            return {
                data: 123
            }
        }
    }

</script>

...and here's Comp 2:

<template>
    
    <div>
        <ul>
            <li>Component 2: { newData }</li>
        </ul>
    </div>

</template>

<script>
    
    export default
    {
        data: function()
        {
            return {
                newData: null
            }
        },
        methods:
        {
            doClick(data)
            {
                this.newData = data;
            }
        }
    }

</script>

I want to trigger the doClick event on Comp1 and handle it in Comp2. What would be the most efficient way and best practice to achieve this? Is Vuex necessary or can events be emitted instead?

Answer №1

In my opinion, instead of complicating things between Comp1 and Comp2, it's more efficient to centralize the data in a parent component that holds both Comp1 and Comp2. Let's call this component ParentComponent.

This approach allows you to maintain the single source of truth in one place. Comp1 doesn't need to store the data itself; it can simply access the data provided by ParentComponent through props. Similarly, Comp2 doesn't have to duplicate the data stored in Comp1; it can also rely on props. Although seemingly minor, consistently following this pattern can make a significant difference. You just need to use emit to communicate any interactions happening within Comp1 or Comp2. This methodology is commonly referred to as "Smart and Dumb components" or sometimes "Smart and View" components.

In essence, the "Smart" component handles all data and interactions, while the "Dumb" or "View" component simply reports back to the Smart component. The advantage here is that the View component can be reused easily.

By contrast, if you were to store data in Comp1, you would also need to store it in ParentComponent, and then pass it down to

Comp2</code. This results in three separate locations for the same data, compared to the initial setup where only <code>ParentComponent
holds the data referenced by both Comp1 and Comp2.

While some may suggest using Vuex, I find this to be an overly complex solution. I personally appreciate the simplicity of React's Context feature and hope for something similar in Vue. It functions like a lighter version of Redux or Vuex, which proves to be sufficient in most cases.

As far as I know, Vue 2 does not offer this functionality. However, there may be a package available that can assist with this. I recommend doing a quick search online to see what options are out there. Please feel free to share any helpful packages you come across. My experience has primarily been with React over the past couple of years, so my knowledge of Vue may not be up to date.

In conclusion, keeping your code simple is always the best practice.

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