I am working on a webapp with drag 'n drop functionality. Up to now I used basic HTML5 Dragging but now I switched to using the library interact.js.
I don't know if my problem is specific to this library or of more general kind: Events when dragging and dropping usually fire multiple times (if I have watched it correctly, it also seems to always be exactly 4 times, but no guarantee on that).
I am also using Vue.js and this is my code:
<template>
<v-card
elevation="0"
:id="id"
class="board device-dropzone"
>
<slot class="row"/>
<div
Drop Card here
</div>
</v-card>
</template>
In the slot, an image and div with text get added. Also this is the script:
<script>
import interact from 'interactjs';
export default {
name: 'Devices',
props: ['id', 'acceptsDrop'],
data() {
return {
extendedHover: false,
hoverEnter: false,
timer: null,
totalTime: 2,
};
},
methods: {
resetHover() {
alert('reset');
},
drop(e) {
let wantedId = e.relatedTarget.id.split('-')[0];
console.log(wantedId);
console.warn(e.target);
e.target.classList.remove('hover-drag-over');
this.extendedHover = false;
console.log('-------------dropped');
console.warn('dropped onto device');
this.$emit('dropped-component', cardId);
e.target.classList.remove('hover-drag-over'); */
},
dragenter() {
console.log('------------dragenter');
this.hoverEnter = true;
setTimeout(() => {
this.extendedHover = true;
console.log('extended hover detected');
}, 2000);
} */
this.timerID = setTimeout(this.countdown, 3000);
},
dragover(e) {
if (this.acceptsDrop) {
e.target.classList.add('hover-drag-over');
}
},
dragleave(e) {
if (this.acceptsDrop) {
clearInterval(this.timer);
this.timer = null;
this.totalTime = 2;
e.target.classList.remove('hover-drag-over');
this.extendedHover = false;
this.hoverEnter = false;
console.log('................');
console.warn(this.extendedHover);
// this.$emit('cancel-hover');
}
},
countdown() {
console.log('!!!!!!!!!!!!!!!!!!!!');
if (this.hoverEnter === true) {
this.extendedHover = true;
console.log('-------------------');
console.warn(this);
console.warn(this.extendedHover);
this.$emit('long-hover');
}
},
},
mounted() {
// enable draggables to be dropped into this
const dropzone = this;
interact('.device-dropzone').dropzone({
overlap: 0.9,
ondragenter: dropzone.dragenter(),
ondrop: function (event) {
dropzone.drop(event);
},
})
},
};
</script>
The draggable component is this one:
<template>
<v-card
class="primary draggable-card"
:id = "id"
:draggable = "false"
@dragover.stop
ref="interactElement"
>
<slot/>
</v-card>
With the script:
<script>
import interact from 'interactjs';
export default {
props: ['id', 'draggable'],
data() {
return {
isInteractAnimating: true,
position: { x: 0, y: 0 },
};
},
methods: {
/* dragStart: (e) => {
e.stopPropagation(); // so dragStart of ParentBoard does not get triggered as well
// eslint-disable-next-line
const target = e.target;
e.dataTransfer.setData('card_id', target.id);
e.dataTransfer.setData('type', 'widget');
// for some delay
setTimeout(() => {
console.log('started dragging');
}, 0);
}, */
dragEndListener: (event) => {
console.warn('+++++++++++++++++++++++++++');
// console.warn(event.currentTarget.id);
if (document.getElementById(event.currentTarget.id)) {
event.currentTarget.parentNode.removeChild(event.currentTarget);
}
},
dragMoveListener: (event) => {
/* eslint-disable */
var target = event.target;
// keep the dragged position in the data-x/data-y attributes
const xCurrent = parseFloat(target.getAttribute('data-x')) || 0;
const yCurrent = parseFloat(target.getAttribute('data-y')) || 0;
const valX = xCurrent + event.dx;
const valY = yCurrent + event.dy;
// translate the element
event.target.style.transform =
`translate(${valX}px, ${valY}px)`
// update the postion attributes
target.setAttribute('data-x', x);
target.setAttribute('data-y', y);
}
/* eslint-enable */
},
mounted() {
const element = this.$refs.interactElement;
console.log(element);
// interact(element).draggable({
const component = this;
interact('.draggable-card')
.draggable({
manualStart: true,
onmove: component.dragMoveListener,
onend:component.dragEndListener,
})
.on('move', function (event) {
var interaction = event.interaction;
// if the pointer was moved while being held down
// and an interaction hasn't started yet
if (interaction.pointerIsDown && !interaction.interacting()) {
var original = event.currentTarget;
// create a clone of the currentTarget element
const clone = event.currentTarget.cloneNode(true);
clone.id = clone.id + "-clone";
clone.classname += " dragged-clone";
// insert the clone to the page
document.body.appendChild(clone);
clone.style.opacity = 0.5;
// start a drag interaction targeting the clone
interaction.start({ name: 'drag' },
event.interactable,
clone);
}
})
.on('end', function (event) {
console.error('end drag');
});
},
/* eslint-enable */
};
</script>
In general the dragging and dropping works. But I don't get why e.g. the drop-event would trigger four times when only dropping a single card. Can anybody help me with this?
