@neodrag/solid

1.96KB

A lightweight directive to make your elements draggable.

Installation

pnpm add @neodrag/solid

# or

npm install @neodrag/solid

# or

yarn add @neodrag/solid

Usage

Basic usage

import { createDraggable } from '@neodrag/solid';

export const App: Component = () => {
  const { draggable } = createDraggable();

  return <div use:draggable>You can drag me</div>;
};

With options

import { createDraggable } from '@neodrag/solid';

const { draggable } = createDraggable();

<div use:draggable={{ axis: 'x', grid: [10, 10] }}>I am draggable</div>;

Defining options elsewhere with typescript

import { createDraggable, type DragOptions } from '@neodrag/solid';

const options: DragOptions = {
  axis: 'y',
  bounds: 'parent',
};

const { draggable } = createDraggable();

<div use:draggable={options}>I am draggable</div>;

Reactive options:

import { createSignal } from 'solid-js';
import { createDraggable } from '@neodrag/solid';

const [options, setOptions] = createSignal({
  axis: 'y',
  bounds: 'parent',
});

<div use:draggable={options()}>I am draggable</div>;

// You can update `options` with `setOptions` anytime and it'll change. Neodrag will automatically update to the new options 😉

Options

axis

Type: 'both' | 'x' | 'y' | 'none'
Default Value: 'both'

Axis on which the element can be dragged on. Valid values: both, x, y, none.

  • both - Element can move in any direction
  • x - Only horizontal movement possible
  • y - Only vertical movement possible
  • none - No movement at all
Both directions
0, 0
<div use:draggable={{ axis: 'both' }}>
  Both directions
</div>
Horizontal
0, 0
<div use:draggable={{ axis: 'x' }}>
  Horizontal
</div>
Vertical
0, 0
<div use:draggable={{ axis: 'y' }}>
  Vertical
</div>
None axis: Won't drag
0, 0
<div use:draggable={{ axis: 'none' }}>
  None axis: Won't drag
</div>

bounds

Type: HTMLElement | 'parent' | string | Partial<DragBoundsCoords>
Default Value: undefined

Optionally limit the drag area

parent: Limit to parent

Or, you can specify any selector and it will be bound to that.

Note: This library doesn’t check whether the selector is bigger than the node element. You yourself will have to make sure of that, or it may lead to unexpected behavior.

Or, finally, you can pass an object of type DragBoundsCoords. These mimic the css top, right, bottom and left, in the sense that bottom starts from the bottom of the window, and right from right of window. If any of these properties are unspecified, they are assumed to be 0.

export type DragBoundsCoords = {
  /** Number of pixels from left of the document */
  left: number;

  /** Number of pixels from top of the document */
  top: number;

  /** Number of pixels from the right side of document */
  right: number;

  /** Number of pixels from the bottom of the document */
  bottom: number;
};
Can't go outside the parent element
0, 0
<div use:draggable={{ bounds: 'parent' }}>
  Can't go outside the parent element
</div>
Can't go outside <body>
0, 0
<div use:draggable={{ bounds: 'body' }}>
  Can't go outside body
</div>
Limited to: top: 60
left: 20
bottom: 35
right: 30
Bounded by these coordinates from the window's edges.
0, 0
<div use:draggable={{ bounds: { top: 60, left: 20, bottom: 35, right: 30 } }}>
  Limited to:

  top: 60
  left: 20
  bottom: 35
  right: 30
</div>

recomputeBounds

Type: { dragStart?: boolean; drag?: boolean; dragEnd?: boolean; }
Default Value: { dragStart: true, drag: false, dragEnd: false }

When to recalculate the dimensions of the `bounds` element.

By default, bounds are recomputed only on dragStart. Use this options to change that behavior.

grid

Type: [number, number]
Default Value: undefined

Applies a grid on the page to which the element snaps to when dragging, rather than the default continuous grid.

If you’re programmatically creating the grid, do not set it to [0, 0] ever, that will stop drag at all. Set it to undefined to make it continuous once again

Snaps to 50x50 grid
0, 0
<div use:draggable={{ grid: [50, 50] }}>
  Snaps to 50x50 grid
</div>
Snaps to 72x91 grid
0, 0
<div use:draggable={{ grid: [72, 91] }}>
  Snaps to 72x91 grid
</div>
Snaps to 0x0 grid - Won't drag at all
0, 0
<div use:draggable={{ grid: [0, 0] }}>
  Snaps to 0x0 grid - Won't drag at all
</div>

defaultPosition

Type: { x: number; y: number }
Default Value: { x: 0, y: 0 }

Offsets your element to the position you specify in the very beginning. x and y should be in pixels. Ignored if position is passed.

Shifted by (100, 40)
100, 40
<div use:draggable={{ defaultPosition: { x: 100, y: 40 } }}>
  Shifted by (100, 40)
</div>

position

Type: { x: number; y: number }
Default Value: undefined

Controls the position of the element programmatically. Fully reactive.

Read about Controlled vs Uncontrolled components.

I can be moved with the slider too
X:    Y:
0, 0
const [position, setPosition] = createSignal({ x: 0, y: 0 });

<div
  use:draggable={{
    position: position(),
    onDrag: ({ offsetX, offsetY }) => setPosition({ x: offsetX, y: offsetY }),
  }}
>
  I can be moved with the slider too
</div>
X:
<input
  type="range"
  min="0"
  max="300"
  value={position().x}
  onInput={(e) => setPosition({ x: +e.target.value, y: position().y })}
/>
Y:
<input
  type="range"
  min="0"
  max="300"
  value={position().y}
  onInput={(e) => setPosition({ x: position().x, y: +e.target.value })}
/>
I can be moved only with the slider
X:    Y:
0, 0
const [position, setPosition] = createSignal({ x: 0, y: 0 });

<div
  use:draggable={{
    position: position(),
    disabled: true
  }}
>
  I can be moved with the slider too
</div>
X:
<input
  type="range"
  min="0"
  max="300"
  value={position().x}
  onInput={(e) => setPosition({ x: +e.target.value, y: position().y })}
/>
Y:
<input
  type="range"
  min="0"
  max="300"
  value={position().y}
  onInput={(e) => setPosition({ x: position().x, y: +e.target.value })}
/>

gpuAcceleration

Type: boolean
Default Value: true

If true, uses `translate3d` instead of `translate` to move the element around, and the hardware acceleration kicks in.

true by default, but can be set to false if blurry text issue occurs.

Depending on the device, you may not see much difference

GPU acceleration on
transform: translate3d(0px, 0px, 0)
<div use:draggable={{ gpuAcceleration: true }}>
  GPU acceleration on
</div>
GPU acceleration off
transform: translate(0px, 0px)
<div use:draggable={{ gpuAcceleration: false }}>
  GPU acceleration off
</div>

applyUserSelectHack

Type: boolean
Default Value: true

Applies user-select: none on <body /> element when dragging, to prevent the irritating effect where dragging doesn’t happen and the text is selected. Applied when dragging starts and removed when it stops.

User Select disabled
Hit ctrl + A while dragging - Nothing will be selected
0, 0
<div use:draggable={{ applyUserSelectHack: true }}>
  User Select disabled
</div>
User Select enabled
Hit ctrl + A while dragging - Text will be selected
0, 0
<div use:draggable={{ applyUserSelectHack: false }}>
  User Select enabled
</div>

ignoreMultitouch

Type: boolean
Default Value: true

Ignores touch events with more than 1 touch.

This helps when you have multiple elements on a canvas where you want to implement pinch-to-zoom behaviour.

Multi touch ignored
0, 0
<div use:draggable={{ ignoreMultitouch: true }}>
  Multi touch ignored
</div>
Multi touch allowed
0, 0
<div use:draggable={{ ignoreMultitouch: false }}>
  Multi touch allowed
</div>

disabled

Type: boolean
Default Value: false

Disables dragging.

Disabled. Won't drag, won't trigger any events
0, 0
<div use:draggable={{ disabled: true }}>
  Disabled. Won't drag, won't trigger any events
</div>

handle

Type: string | HTMLElement | HTMLElement[]
Default Value: undefined

CSS Selector of an element or multiple elements inside the parent node(on which use:draggable is applied). Can be an element or elements too. If it is provided, Only clicking and dragging on this element will allow the parent to drag, anywhere else on the parent won’t work.

Won't drag ❌

Drag me ✅
Single handle with selector
0, 0
<div use:draggable={{ handle: '.handle' }}>
  Won't drag ❌

  <div class="handle">Drag me ✅</div>
</div>
Won't drag ❌

Drag me ✅
Single handle with element
0, 0
let handleEl: HTMLDivElement;

<div use:draggable={{ handle: handleEl }}>
  Won't drag ❌

  <div ref={handleEl}>Drag me ✅</div>
</div>
Won't drag ❌

Drag me ✅
Drag me ✅
Multiple handle with selector
0, 0
<div use:draggable={{ handle: '.handle' }}>
  Won't drag ❌

  <div class="handle">Drag me ✅</div>
  <div class="handle">Drag me ✅</div>
</div>
Won't drag ❌

Drag me ✅
Drag me ✅
Multiple handle with element
0, 0
let handle1: HTMLDivElement;
let handle2: HTMLDivElement;

<div use:draggable={{ handle: [handle1, handle2] }}>
  Won't drag ❌

  <div ref={handle1}>Drag me ✅</div>
  <div ref={handle2}>Drag me ✅</div>
</div>

cancel

Type: string | HTMLElement | HTMLElement[]
Default Value: undefined

CSS Selector of an element or multiple elements inside the parent node(on which use:draggable is applied). Can be an element or elements too. If it is provided, Trying to drag inside the cancel element(s) will prevent dragging.

This will drag!

This won't drag
Single cancel with selector
0, 0
<div use:draggable={{ cancel: '.cancel' }}>
  This will drag!

  <div class="cancel">This won't drag</div>
</div>
This will drag!

This won't drag
Single cancel passed as element.
0, 0
let cancelEl: HTMLDivElement;

<div use:draggable={{ cancel: cancelEl }}>
  This will drag!

  <div ref={cancelEl}>This won't drag</div>
</div>
This will drag!

This won't drag
This won't drag
Multiple cancel passed as element.
0, 0
<div use:draggable={{ cancel: '.cancel' }}>
  This will drag!

  <div class="cancel">This won't drag</div>
  <div class="cancel">This won't drag</div>
</div>
This will drag!

This won't drag
This won't drag
Multiple cancel passed as array of elements.
0, 0
let cancel1: HTMLDivElement;
let cancel2: HTMLDivElement;

<div use:draggable={{ cancel: [cancel1, cancel2] }}>
  This will drag!

  <div ref={cancel1}>This won't drag</div>
  <div ref={cancel2}>This won't drag</div>
</div>

defaultClass

Type: string
Default Value: undefined

Class to apply to draggable element.

If handle is provided, it will still apply class on the parent element, NOT the handle.

defaultClassDragging

Type: string
Default Value: 'neodrag-dragging'

Class to apply on the parent element when it is dragging

defaultClassDragged

Type: string
Default Value: 'neodrag-dragged'

Class to apply on the parent element if it has been dragged at least once. Removed once dragging stops.

onDragStart

Type: (data: DragEventData) => void
Default Value: undefined

Fires when dragging start.

onDrag

Type: (data: DragEventData) => void
Default Value: undefined

Fires when dragging is going on.

onDragEnd

Type: (data: DragEventData) => void
Default Value: undefined

Fires when dragging stops.

Events

@neodrag/solid emits 3 events, onDrag, onDragStart & onDragEnd. Example:

<div
  use:draggable={{
    onDragStart: (data) => console.log('Dragging started', data),
    onDrag: (data) => console.log('Dragging', data),
    onDragEnd: (data) => console.log('Dragging stopped', data),
  }}
>
  Hello
</div>

TypeScript

This library ships with proper TypeScript typings, for the best Developer Experience, whether authoring JS or TS.

To get proper TypeScript typing for the use:draggable syntax, add this line to your root globals.d.ts file:

/// <reference types="@neodrag/solid/globals" />

Or, add to tsconfig.json:

{
  "compilerOptions": {
    "types": ["@neodrag/solid/globals"]
  }
}

However, these types will only work if you destructure the draggable directive as draggable only. If you rename it, like this:

import { createDraggable } from '@neodrag/solid';

const { draggable: myCustomDraggable } = createDraggable();

<div use:myCustomDraggable>Drag me</div>;

It will give an error

Property 'use:myCustomDraggable' does not exist on type 'HTMLAttributes<HTMLDivElement>'.

In that case, you have to manually add to your globals.d.ts file this snippet:

import { DragOptions } from '@neodrag/solid';
import 'solid-js';

declare module 'solid-js' {
  namespace JSX {
    interface Directives {
      myCustomDraggable: DragOptions;
    }
  }
}

Types Exported from package

This package exports these types you can use:

import type {
  DragAxis,
  DragBounds,
  DragBoundsCoords,
  DragOptions,
  DragEventData,
} from '@neodrag/solid';

DragOptions is the documented list of all options provided by the component.

DragAxis is the type of axis option, and is equal to 'both' | 'x' | 'y' | 'none'.

DragBounds is 'parent' | string | Partial<DragBoundsCoords>, the complete type of bounds option.

DragBoundsCoords is when you’re specifying the bounds field using an object, this is the type needed for that.

export type DragBoundsCoords = {
  /** Number of pixels from left of the window */
  left: number;

  /** Number of pixels from top of the window */
  top: number;

  /** Number of pixels from the right side of window */
  right: number;

  /** Number of pixels from the bottom of the window */
  bottom: number;
};

Controlled vs Uncontrolled

This is taken straight from React’s philosophy(After all, this package is inspired from react-draggable).

Uncontrolled means your app doesn’t control the dragging of the app. Meaning, the user drags the element, it changes position, and you do something with that action. You yourself don’t change position of the element or anything. This is the default behavior of this library.

Controlled means your app, using state variables, changes the position of the element, or in simple terms, programmatically drag the element. You basically set the position property to { x: 10, y: 50 }(or any other numbers), and voila! yur now controlling the position of the element programmatically 🥳🥳

OFC, this library doesn’t go fully Controlled. The user can still drag it around even when position is set.

So, when you change position, the element position changes. However, when the element is dragged by user interaction, position is not changed. This is done intentionally, as two-way data binding here isn’t possible and also will lead to unexpected behavior. To keep the position variable up to date, use the onDrag event to keep your state up to date to the draggable’s internal state.

To have it be strictly Controlled, meaning it can only be moved programmatically, add the disabled option to your draggable element’s config

<div use:draggable={{ position: { x: 0, y: 10 }, disabled: true }} />

Here are a bunch of examples showing controlled behavior 👇

Future plans

Right now, if you look at the syntax, it looks like this:

import { createDraggable } from '@neodrag/solid';

const { draggable } = createDraggable();

<div
  use:draggable={
    {
      /* options */
    }
  }
/>;

If you look closely, the createDraggable is completely useless. It could’ve just been:

import { draggable } from '@neodrag/solid';

<div
  use:draggable={
    {
      /* options */
    }
  }
/>;

So why an extra function? Because use:draggable, after compiled, is just treated as a string. This means, the typescript compiler/rollup will just remove the import named draggable completely, breaking the whole code. Hence a wrapper function is needed.

In future, if SolidJS introduces a mechanism similar to Svelte’s actions, I’ll be able to get rid of that extra call entirely! So if you find this syntax a little more verbose, bear with me, it might become better :)

Credits

Inspired from the amazing react-draggable library, and implements the same API.