Photo by Auto Fan on Unsplash

Vue 3 is the latest version of the easy to use Vue JavaScript framework that lets us create front end apps.

In this article, we’ll look at how to create a drag and drop app with Vue 3 and JavaScript.

Create the Project

We can create the Vue project with Vue CLI.

To install it, we run:

npm install -g @vue/cli

with NPM or:

yarn global add @vue/cli

with Yarn.

Then we run:

vue create drag-and-drop

and select all the default options to create the project.

Create the Drag and Drop App

To create the drag and drop app, we write:

<template>
<h2>Draggable Elements</h2>
<div
class="draggable"
:draggable="true"
@dragstart="drag($event, o)"
v-for="o of origin"
:key="o"
@click.stop
>
{{ o }}
</div>
<h2>Target</h2>
<div id="target" @dragover.prevent @drop="drop">
<div class="draggable" v-for="t of target" :key="t">
{{ t }}
</div>
</div>
</template>
<script>
export default {
name: "App",
data() {
return {
origin: ["apple", "orange", "grape"],
target: [],
};
},
methods: {
drag(ev, text) {
ev.dataTransfer.setData("text", text);
},
drop(ev) {
const text = ev.dataTransfer.getData("text");
const index = this.origin.findIndex((o) => o === text);
this.origin.splice(index, 1);
this.target.push(text);
},
},
};
</script>
<style scoped>
.draggable {
border: 1px solid black;
margin-right: 5px;
}
#target {
border: 1px solid black;
width: 95vw;
height: 100px;
padding: 5px;
}
</style>

In the template, we have divs under the Draggable Elements heading.

We style the divs by setting the class of each div to draggable .

Then we add a border to the draggable class.

To make the divs draggable, we set the draggable prop to true .

Next, we add the @dragstart directive to listen for the dragstart event, which is triggered when we first start dragging the div.

We use v-for to render the items in the origin array.

And we set the key to the origin entry so that Vue 3 can identify the items.

The entries are unique so we can just assign them as the value of the key prop.

Also, we have the @click.stop directive to stop the propagation of the click event.

Below the Target heading, we have the container div for the draggable items.

We have the @dragover.prevent directive to prevent the default behavior when we drag over the div which lets us keep dragging the item.

The @drop directive lets us call drop to put the items in the target array.

We render the target array inside the div with ID target with v-for .

In the script tag, we have the data method which has the origin and target reactive properties.

The drag method calls ev.dataTransfer.data to set the data we’re transferring when we start dragging the element.

In the drop method, we call ev.dataTransfer.getData to get the data by the key and return the item with key 'text' .

Then we find the item in the origin array and remove it from it with splice .

Then finally, we call this.target.push to append the item to the target array.

The style tag has some styles for the draggable items and the target container div.

Now we can drag the items from the Draggable Elements section to the Target section.

Conclusion

We can add drag and drop features easily into our app with Vue 3 and JavaScript.

More content at plainenglish.io


Create a Drag and Drop App with Vue 3 and JavaScript was originally published in JavaScript in Plain English on Medium, where people are continuing the conversation by highlighting and responding to this story.