vue-dragscroll (Documentation)

vue-dragscroll is a micro vue.js directive which enables scrolling via holding the mouse button ("drag and drop" or "click and hold" style, online demo).

Installation

Via npm

$ npm install vue-dragscroll

Then, in your JavaScript file:

// Register dragscroll globally
import VueDragscroll from 'vue-dragscroll'
Vue.use(VueDragscroll)

// Or, register it locally in a component
import { dragscroll } from 'vue-dragscroll'
export default {
  name: 'MyComponent',
  directives: {
    'dragscroll': dragscroll
  },
}

Via cdn

Download the and unpack distribution

<script src="path/to/vue-dragscroll.min.js"></script>
<!-- OR -->
<script src="https://unpkg.com/vue-dragscroll"></script>

Usage

Add the v-dragscroll directive to a scrollable element:

<div v-dragscroll>
    Big text goes here...
</div>

That's it! Now you can scroll it by dragging.

Keep in mind that now it is not possible to select the content with mouse, so apply the cursor: default; CSS style to prevent confusing the users (or even cursor: grab; in case the content is not a text).

/* EXEMPLE */
.grab-bing {
  cursor : -webkit-grab;
  cursor : -moz-grab;
  cursor : -o-grab;
  cursor : grab;
}


.grab-bing:active {
  cursor : -webkit-grabbing;
  cursor : -moz-grabbing;
  cursor : -o-grabbing;
  cursor : grabbing;
}

You can also add the :nochilddrag argument to the v-dragscroll, which will only enable drag-scrolling for an element itself, but not for its subchildren. This can be usefull, if you want to enable the scrolling the area by dragging its empty space, but keep the opportunity to select the text (see example).

<div v-dragscroll:nochilddrag>
  ...content
</div>

If you wish to handle enable/disable dragscrolling, you can pass a boolean as value (This doesn't apply for mobile)

<div v-dragscroll="false">
  ...content
</div>

If you wish to scroll only Vertically or Horizotally, you can use x or y modifiers.

<div v-dragscroll.x="true">
  ...content
</div>
<div v-dragscroll.y="true">
  ...content
</div>

Select which elements can be dragged (data attributes method)

<div v-dragscroll> 
  <div class="child">...<div><!-- can be dragged -->
  <div class="child" data-no-dragscroll>...<div><!-- can't be dragged -->
<div>

<div v-dragscroll:nochilddrag> 
  <div class="child" data-dragscroll>...<div><!-- can be dragged -->
  <div class="child">...<div><!-- can't be dragged -->
<div>

Firstchilddrag (DEPRECATED, prefer data attributes)

<div v-dragscroll:firstchilddrag> 
    <div class="subContainer">...<div> 
  <div>

It would be helpful if scroll were passed to the window object, when max scroll position were reached, you can use pass modifier.

<div v-dragscroll.pass>
  ...content
</div>

when the scroll is passed not to the window, but to another scroll context, you can specify the element to pass the scrolling to.

<div v-dragscroll.pass="{container: '.my-scroll-container'}">
  ...content
</div>

If you want to apply dragscroll to a child dom element you have no control over (because generated by vuejs). You can use v-dragscroll="{ target: 'element' }" to tell to which child the directive will be applied.

<!-- Vue -->
<mycomponent v-dragscroll="{ target: '.my-draggable-div' }">
  ...content
</mycomponent>

<!-- HTML generated -->
<div class="mycomponent">
  <div class="my-draggable-div">
    ...content
  </div>
</div>

In this case to control if drag should be enabled/disabled you can add the active parameter.

<mycomponent v-dragscroll="{ target: '.my-draggable-div', active: true }">
  ...content
</mycomponent>

If you wish to ignore specific mouse buttons, you can use the following modifiers.

• noleft
• nomiddle
• noright
• noback
• noforward

<div v-dragscroll.noleft="true">
  ...content
</div>
<div v-dragscroll.noback.noforward="true">
  ...content
</div>

Events

The directive provides 3 events.

• dragscrollstart
• dragscrollmove
• dragscrollend

The dragscrollmove event includes a data object with the following format:

{
  detail: {
    deltaX: 0, // if using the x modifier, or no axis modifier
    deltaY: 0, // if using the y modifier, or no axis modifier
  },
}

Example:

<div
  v-dragscroll
  v-on:dragscrollstart="doSomething"
  v-on:dragscrollmove="doSomething(params, $event.detail.deltaX)"
  v-on:dragscrollend="doSomething"
>
..Content
<div>

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