Binding variables in VueJS to the Material.io Drawer component

Presently, I am delving into VueJS and experimenting with .

I have crafted an application with multiple pages, each featuring a sidebar (utilizing the drawer component ).

To avoid repetitive code, I aim to create a single sidebar component that can be imported onto every page.

Everything is working smoothly so far.

However, I now wish to implement functionality that allows me to toggle the sidebar open and closed. When the sidebar was embedded directly in the page, toggling its visibility was straightforward - a simple boolean variable assignment would suffice. However, synchronizing this property across components seems challenging to me now.

Let me demonstrate the current code structure to highlight the issue:

This is the page component:

<md-toolbar class="md-primary">
    <md-button class="md-icon-button" @click="showSidebar=true">
        <md-icon>menu</md-icon>
    </md-button><span class="md-title">Dashboard</span>
</md-toolbar>
<Sidebar v-bind:showSidebar="showSidebar"></Sidebar>

That's the Vue Structure - you can see how I'm binding the showSidebar property within the page.

import Sidebar from './sidebar.vue';
export default {
    data: function () {
        return {
            showSidebar: false
        }
    },
    components: {
        Sidebar: Sidebar
    },

Now, let's delve into the Sidebar component itself:

<md-drawer v-bind:md-active.sync="showSidebar">

The sidebar component retrieves the value through a property like this:

export default {
    name: 'sidebar',
    props: ['showSidebar'],

It seems to be functioning correctly! I can click on the menu button on the page, set the property to true, and the sidebar appears! However, upon clicking outside of the sidebar, a warning message is displayed. Moreover, I encounter difficulty reopening it on subsequent clicks without refreshing the page.

How can I resolve this issue? I considered using events since the drawer component seems to listen for them, but my attempts were unsuccessful. Here's the current code from the drawer component: https://github.com/vuematerial/vue-material/blob/dev/src/components/MdDrawer/MdDrawer.vue

I hope I've articulated my problem clearly.

If anyone could offer assistance, I would greatly appreciate it.

This marks my first question here, so please extend your kindness :)

/EDIT: Oops, here is the warning message:


[Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value.
Prop being mutated: "showSidebar"

Answer №1

While I may not be an expert in Vue, I am still in the process of learning it myself. However, I believe I have a good understanding of what is happening here.

The warning you are encountering seems to be related to having a prop and a data property with the same name. To address this issue, try removing the data setting and adjust the props setting as follows:

props: {
    showSidebar: {
        type: Boolean,
        default: false
    }
}

Give this adjustment a try to see if it resolves the problem. Additionally, considering how you are utilizing this feature, I recommend exploring Vuex. The documentation is comprehensive and it can greatly assist in managing your application, potentially resolving the drawer reopening issue.

Edit:

Upon further examination of this user's code (including discussion on discord), it was observed that the problem stemmed from managing the process of opening the sidebar within the parent component while closing it solely within the child component. When data is bound from parent to child components in Vue, it is crucial to update the source of changes (the parent component) accordingly. In Vue, data flows unidirectionally, requiring the use of $emit events to communicate information back to the parent component.

My current suggestion is to introduce a custom event to the sidebar component tag in the parent component:

<Sidebar v-bind:showSidebar="showSidebar" v-on:hide-sidebar="showSidebar=false"></Sidebar>

Subsequently, modify the close tag in the child component as depicted below:

<span class="md-title" @click="$emit('hide-sidebar')">FleaMaster</span>

I hope this insight will be beneficial to others facing similar challenges!

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