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386
ViewsHow to get files from angular 2 onDrop event?
I tried like this but onDrop method don't return image files when I drop to it...
onDragStart(event, data: any) {
event.dataTransfer.setData('data', data);
}
onDrop(event, data: any) {
let dataTransfer = event.dataTransfer.getData('data');
event.preventDefault();
}
allowDrop(event) {
event.preventDefault();
}
<div (drop)="onDrop($event, dropData)" (dragover)="allowDrop($event)"></div>
<div (dragstart)="onDragStart($event, dragData)"></div>
Any solution for this?
3 answers
Answer question0
The event onDrop event fires only when onDragOver has preventDefault() and stopPropagation() methods run on event.
HTML
<div
(drop)="onDrop($event)"
(dragover)="onDragOver($event)"
>
Drop target
</div>
DropComponent.ts
export class DropComponent {
onDrop(event) {
event.preventDefault();
}
onDragOver(event) {
event.stopPropagation();
event.preventDefault();
}
}
UPDATE
This is required because by default the browser prevents anything from happening while dropping onto the HTML element. See more at MDN - Defining a valid drop zone
0
Here is the complete code for drag and drop in Angular 2/4/6 :
drag.component.ts:
import { Component } from '@angular/core';
@Component({
selector: 'drag-root',
templateUrl: './drag.component.html',
styleUrls: ['./drag.component.css']
})
export class AppComponent {
allowDrop(ev) {
ev.preventDefault();
}
drag(ev) {
ev.dataTransfer.setData("text", ev.target.id);
}
drop(ev) {
ev.preventDefault();
var data = ev.dataTransfer.getData("text");
ev.target.appendChild(document.getElementById(data));
}
}
drag.component.html:
<h2>Drag and Drop</h2>
<div id="div1"
(drop)="drop($event)"
(dragover)="allowDrop($event)">
<img
src="https://images.pexels.com/photos/658687/pexels-photo-658687.jpeg?auto=compress&cs=tinysrgb&h=350"
draggable="true"
(dragstart)="drag($event)"
id="drag1"
width="88"
height="31">
</div>
<div id="div2"
(drop)="drop($event)"
(dragover)="allowDrop($event)">
</div>
drag.component.css:
#div1, #div2 {
float: left;
width: 100px;
height: 35px;
margin: 10px;
padding: 10px;
border: 1px solid black;
}
Snapshots:
0
You could wrap the onDrop functionality into a reusable directive. Like this:
https://gist.github.com/darrenmothersele/7afda13d858a156ce571510dd78b7624
Apply this directive to an element:
<div (appDropZone)="onDrop($event)"></div>
The event is fired with a JavaScript array of the dropped Files. So, your onDrop implementation in the component looks something like this:
onDrop(files: FileList) {
console.log({ files });
}