Prevent click event after dragging

[Tofandel]

trafficstars

After a drag occurs, the click event should be stopped from firing with stopImmediatePropagation

It otherwise leads to unexpected clicked elements within the scroll area

[zeroinformatique]

Same issue here, with an additional note:

On Android/Chrome, the dragscrollstart event is triggered almost instantly, making it difficult to guess if we're on a click (touch) or a real drag.

I had to use a trick to bypass this issue:

• dragscrollstart: Starts a 100ms timer, this timer sets a variable: dragging = true
• dragscrollend: Cleans the timer (in case it was still running, which means we're on a click)
• click.capture: if dragging is true, preventDefault (blocks the click after a drag)

[zeroinformatique]

export default class DragScrollClickFix {

  readonly DRAG_DELAY = 100; // This is the minimal delay to consider a click to be a drag, mostly usefull for touch devices

  timer: NodeJS.Timeout | null = null;
  dragging: boolean = false;

  onDragScrollStart() {
    this.timer = setTimeout(() => this.onTimer(), this.DRAG_DELAY);
  }

  onTimer() {
    this.timer = null;
    this.dragging = true;
  }

  onDragScrollEnd() {
    if (this.timer) {
      clearTimeout(this.timer);
      this.timer = null;
    }
    setTimeout(() => this.dragging = false);
  }

  onClickCapture(e: MouseEvent) {
    if (this.dragging) {
      this.dragging = false;
      e.preventDefault();
      e.stopPropagation();
    }
  }
}

In your JS:

dragScrollClickFix = new DragScrollClickFix();

Then in your Vue template:

@click.capture="e => dragScrollClickFix.onClickCapture(e)"
@dragscrollstart="dragScrollClickFix.onDragScrollStart()"
@dragscrollend="dragScrollClickFix.onDragScrollEnd()"

[donmbelembe]

Please let me know the version you are using

On Mon, Feb 10, 2020, 5:35 AM OzoneGrif [email protected] wrote:

export default class DragScrollClickFix {

readonly DRAG_DELAY = 100; // This is the minimal delay to consider a click to be a drag, mostly usefull for touch devices

timer: NodeJS.Timeout | null = null; dragging: boolean = false;

onDragScrollStart() { this.timer = setTimeout(() => this.onTimer(), this.DRAG_DELAY); }

onTimer() { this.timer = null; this.dragging = true; }

onDragScrollEnd() { if (this.timer) { clearTimeout(this.timer); this.timer = null; } }

onClickCapture(e: MouseEvent) { if (this.dragging) { this.dragging = false; e.preventDefault(); e.stopPropagation(); } } }

In your JS:

dragScrollClickFix = new DragScrollClickFix();

Then in your Vue template:

@click.capture="e => dragScrollClickFix.onClickCapture(e)"
@dragscrollstart="dragScrollClickFix.onDragScrollStart()"
@dragscrollend="dragScrollClickFix.onDragScrollEnd()"

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[zeroinformatique]

v1.10.2 here. Didn't test it on 2.0.0.

[donmbelembe]

Please try 2.0 and let me know because your issue will be fixed on version 2

On Mon, Feb 10, 2020, 5:45 AM OzoneGrif [email protected] wrote:

v1.10.2 here. Didn't test it on 2.0.0.

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[zeroinformatique]

Just tested, issue is still present in v2.0.0 Edit: and my fix still works.

[jos-]

Another possible fix is to do preventDefault() if the position of the mouse release is significantly far away (e.g. at least 5 pixels) from the start position. This is the solution https://github.com/ilyashubin/scrollbooster uses.

Somewhat shorter version of @OzoneGrif's fix: <div v-dragscroll @dragscrollstart="onDragStart" @click.capture="onDragClick"></div>

import { dragscroll } from 'vue-dragscroll';

export default {
  directives: {
    dragscroll,
  },
  data: () => ({
    dragged: false,
    dragTimeout: null,
  }),
  methods: {
    onDragStart() {
      clearTimeout(this.dragTimeout);

      this.dragged = false;
      this.dragTimeout = setTimeout(() => { this.dragged = true; }, 100); // Minimal delay to be regarded as drag instead of click
    },
    onDragClick(e) {
      if (this.dragged) {
        e.preventDefault();
      }

      this.dragged = false;
    },
  },
};

It would be nice if one of these solutions (time comparison or distance comparison) would be implemented by default for links.

[donmbelembe]

thank you! let me try your solution

[donmbelembe]

I'm not able to get the same issue as you guys, someone can make a codepen that has exactly the issue ?

[donmbelembe]

@Tofandel and @OzoneGrif are you listening of the click event directly from the dragscroll element or on a child ?

[zeroinformatique]

Child. You dragscroll the parent, using your mouse or touchscreen. When you release the drag, it triggers the click on the child component which is beneath the cursor or finger.

[drewbaker]

We use this for a thumbtray of nuxt-links below a video. When you click to drag the tray, on mouseup it will follow the link that you cursor is on.

[arjan-vdw]

This worked for me:

On the anchor:

:class="{'no-pointer-event': dragged}" State:

data(){ return { dragged: false } }

Methods: `onDragsStart() { clearTimeout(this.dragTimeout);

this.dragged = false; this.dragTimeout = setTimeout(() => { this.dragged = true; }, 100); }, onDragClick() { setTimeout(() => { this.dragged = false; }, 100); },`

Style: <style lang="scss"> .no-pointer-event{ pointer-events: none; } </style>

[arildm]

I made a thin component Dragscroll.vue out of it (Vue 3):

<script setup>
// Avoid emitting click event when scrolldragging
let dragging = false;
let timer = null;

function start() {
  timer = setTimeout(() => (dragging = true), 100);
}

function end() {
  clearTimeout(timer);
  setTimeout(() => (dragging = false));
}

function click(event) {
  if (dragging) {
    event.stopPropagation();
  }
}
</script>

<template>
  <div
    v-dragscroll
    @dragscrollstart="start"
    @dragscrollend="end"
    @click.capture="click"
  >
    <slot />
  </div>
</template>

[tobijafischer]

I made a thin component Dragscroll.vue out of it (Vue 3):

Just adding this for anyone who uses Typescript. Using ReturnType because setTimeout typing depends on the environment (see here)

<script setup lang="ts">
// Avoid emitting click event when scrolldragging
let dragging = false;
let timer: ReturnType<typeof setTimeout> | null = null;

function start() {
  timer = setTimeout(() => (dragging = true), 100);
}

function end() {
  if (timer) {
    clearTimeout(timer);
  }
  setTimeout(() => (dragging = false));
}

function click(event: MouseEvent) {
  if (!dragging) return;
  event.stopPropagation();
}
</script>

<template>
  <div
    v-dragscroll
    @dragscrollstart="start"
    @dragscrollend="end"
    @click.capture="click"
  >
    <slot />
  </div>
</template>

Let me know I the above code can be improved. I'm no TS expert by any means.