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    jQuery.panzoom

    A jQuery plugin for panning and zooming elements using CSS3.
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    Panzoom

    Build Status

    Examples


    Panzoom is a small library (~3.7kb gzipped) to add panning and zooming functionality to an element. Rather than using absolute positioning or setting width and height, Panzoom uses CSS transforms to take advantage of hardware/GPU acceleration in the browser, which means the element can be anything: an image, a video, an iframe, a canvas, text, WHATEVER.

    For common support questions, see the FAQ.

    Browser support

    Here is a list of currently supported browsers.

    Mobile support

    iOS, Android, and Windows Mobile are supported.

    Panzoom includes support for touch gestures and even supports pinch gestures for zooming. It is perfectly suited for both mobile and desktop browsers. It uses pointer events by default wherever supported.

    SVG support

    Panzoom supports panning and zooming SVG elements directly.

    In IE11, CSS animations/transitions do not work on SVG elements, at least for the transform style. They do work in other browsers.

    One could implement transitions manually in IE11 using the setTransform option and integrating a tweening library for javascript animations (such as tween.js).

    Installing

    With npm:

    $ npm install --save @panzoom/panzoom
    

    With yarn:

    $ yarn add @panzoom/panzoom
    

    Panzoom uses UMD and can be loaded a lot of ways.

    With ES6 imports:

    import Panzoom from '@panzoom/panzoom'
    

    With commonjs or browserify:

    const Panzoom = require('@panzoom/panzoom')
    

    With an AMD loader in an anonymous module:

    define(['@panzoom/panzoom'], function (Panzoom) {
      const elem = document.getElementById('panzoom-element')
      Panzoom(elem)
    })
    

    With a script tag:

    <script src="/js/panzoom.js"></script>
    

    Usage

    const elem = document.getElementById('panzoom-element')
    const panzoom = Panzoom(elem, {
      maxScale: 5
    })
    panzoom.pan(10, 10)
    panzoom.zoom(2, { animate: true })
    
    // Panning and pinch zooming are bound automatically (unless disablePan is true).
    // There are several available methods for zooming
    // that can be bound on button clicks or mousewheel.
    button.addEventListener('click', panzoom.zoomIn)
    elem.parentElement.addEventListener('wheel', panzoom.zoomWithWheel)
    

    FAQ

    1. What is transform-origin and why is it added to the panzoom element?

    • The transform-origin is the origin from which transforms are applied. Panzoom ensures the defaults are set to what it expects to calculate focal point zooming.
    • HTML elements default to '50% 50%'.
    • SVG elements default to '0 0'.

    2. I am using Panzoom with an <object> tag and it's not working. What's wrong?

    Object elements can eat up events, making it so they never reach Panzoom. To fix this, disable pointer events (pointer-events: none) on the <object> tag and call Panzoom using a wrapper.

    3. My links aren't working! How do I enable an anchor within a panzoom element?

    Add class options.excludeClass (default is "panzoom-exclude") to whatever element you want to be clickable. Panzoom will check for this class before handling the event. Alternatively, add a reference to the element to the exclude option, or call event.stopImmediatePropagation() in an event handler on the clickable element.

    A note on the async nature of Panzoom

    In some cases, setting one thing and then setting another synchronously will not work as intended.

    For instance, the following usually works fine.

    const panzoom = Panzoom(elem)
    panzoom.zoom(2)
    panzoom.pan(100, 100)
    

    However, you might find that the things start breaking when the contain option is set.

    This is due to the fact that in order for Panzoom to retrieve proper dimensions, the scale needs to be painted.

    If you find that things aren't looking quite right, try the following instead...

    panzoom.zoom(2)
    setTimeout(() => panzoom.pan(100, 100))
    

    Documentation

    Panzoom(elem: HTMLElement | SVGElement, options?: Omit‹PanzoomOptions, "force"›): PanzoomObject

    Defined in panzoom.ts:51

    Parameters:

    Name Type
    elem HTMLElement | SVGElement
    options? Omit‹PanzoomOptions, "force"›

    Returns: PanzoomObject

    PanzoomOptions

    Includes MiscOptions, PanOptions, and ZoomOptions


    MiscOptions

    animate

    animate? : boolean (Default: false)

    Defined in types.ts:13

    Whether to animate transitions


    canvas

    canvas? : boolean (Default: false)

    Defined in types.ts:24

    This option treats the Panzoom element's parent as a canvas. Effectively, Panzoom binds the down handler to the parent instead of the Panzoom element, so that pointer events anywhere on the "canvas" moves its children. See issue #472.

    Note: setting this option to true also changes where the cursor style is applied (i.e. the parent).


    duration

    duration? : number (Default: 200)

    Defined in types.ts:26

    Duration of the transition (ms)


    easing

    easing? : string (Default: "ease-in-out")

    Defined in types.ts:28

    CSS Easing used for transitions


    exclude

    exclude? : Element[]

    Defined in types.ts:35

    Add elements to this array that should be excluded from Panzoom handling. Ancestors of event targets are also checked. e.g. links and buttons that should not propagate the click event.


    excludeClass

    excludeClass? : string (Default: "panzoom-exclude")

    Defined in types.ts:42

    Add this class to any element within the Panzoom element that you want to exclude from Panzoom handling. That element's children will also be excluded. e.g. links and buttons that should not propagate the click event.


    force

    force? : boolean

    Defined in types.ts:58

    force should be used sparingly to temporarily override and ignore options such as disablePan, disableZoom, and panOnlyWhenZoomed. This option cannot be passed to the Panzoom constructor or setOptions (to avoid setting this option globally).

    // Overrides disablePan and panOnlyWhenZoomed
    panzoom.pan(50, 100, { force: true })
    // Overrides disableZoom
    panzoom.zoom(1, { force: true })
    

    handleStartEvent

    handleStartEvent? : function

    Defined in types.ts:83

    On the first pointer event, when panning starts, the default Panzoom behavior is to call event.preventDefault() and event.stopPropagation() on that event. The former is almost certainly a necessity; the latter enables Panzoom elements within Panzoom elements.

    But there are some cases where the default is not the desired behavior. Set this option to override that behavior.

    // Only call preventDefault()
    Panzoom(elem, {
      handleStartEvent: (event) => {
        event.preventDefault()
      }
    })
    // Do nothing.
    // This can change dragging behavior on mobile.
    Panzoom(elem, {
      handleStartEvent: () => {}
    })
    

    Type declaration:

    ▸ (event: Event): void

    Parameters:

    Name Type
    event Event

    noBind

    noBind? : boolean

    Defined in types.ts:87

    Skip binding the default Panzoom event listeners


    origin

    origin? : string

    Defined in types.ts:101

    Change this at your own risk. The transform-origin is the origin from which transforms are applied. Default: '50% 50%' for HTML and '0 0' for SVG. The defaults are set because changing the transform-origin on SVG elements doesn't work in IE.

    Changing this should work with many things, but it will break focal point zooming, which assumes the defaults are set to do the more complicated calculations.

    And again, changing this for SVG in IE doesn't work at all.


    overflow

    overflow? : string (Default: "hidden")

    Defined in types.ts:103

    The overflow CSS value for the parent. Defaults to 'hidden'


    setTransform

    setTransform? : typeof setTransform

    Defined in types.ts:121

    Override the transform setter. This is exposed mostly so the user could set other parts of a transform aside from scale and translate. Default is defined in src/css.ts.

    // This example always sets a rotation
    // when setting the scale and translation
    const panzoom = Panzoom(elem, {
      setTransform: (elem, { scale, x, y }) => {
        panzoom.setStyle('transform', `rotate(0.5turn) scale(${scale}) translate(${x}px, ${y}px)`)
      }
    })
    

    silent

    silent? : boolean

    Defined in types.ts:123

    Silence all events


    startScale

    startScale? : number (Default: 1)

    Defined in types.ts:129

    Scale used to set the beginning transform


    startX

    startX? : number (Default: 0)

    Defined in types.ts:125

    X Value used to set the beginning transform


    startY

    startY? : number (Default: 0)

    Defined in types.ts:127

    Y Value used to set the beginning transform


    touchAction

    touchAction? : string (Default: "none")

    Defined in types.ts:139

    This value is used to set touch-action on both the Panzoom element and its parent. It is needed because that the native scroll on mobile interferes with panning and pinch zooming. Set this to empty string to re-enable scrolling on mobile, but note that both scrolling and panning cannot work at the same time.


    PanOptions

    Includes MiscOptions

    contain

    contain? : "inside" | "outside"

    Defined in types.ts:158

    Contain the panzoom element either inside or outside the parent. Inside: The panzoom element is smaller than its parent and cannot be panned to the outside. Outside: The panzoom element is larger than its parent and cannot be panned to the inside. In other words, no empty space around the element will be shown.

    Note: the containment pan adjustment is not affected by the disablePan option.


    cursor

    cursor? : string (Default: "move")

    Defined in types.ts:160

    The cursor style to set on the panzoom element


    disablePan

    disablePan? : boolean (Default: false)

    Defined in types.ts:166

    Disable panning functionality. Note: disablePan does not affect focal point zooming or the contain option. The element will still pan accordingly.


    disableXAxis

    disableXAxis? : boolean (Default: false)

    Defined in types.ts:168

    Pan only on the Y axis


    disableYAxis

    disableYAxis? : boolean (Default: false)

    Defined in types.ts:170

    Pan only on the X axis


    panOnlyWhenZoomed

    panOnlyWhenZoomed? : boolean (Default: false)

    Defined in types.ts:174

    Disable panning while the scale is equal to the starting value


    relative

    relative? : boolean (Default: false)

    Defined in types.ts:172

    When passing x and y values to .pan(), treat the values as relative to their current values


    ZoomOptions

    Includes MiscOptions

    disableZoom

    disableZoom? : boolean (Default: false)

    Defined in types.ts:179

    Disable zooming functionality


    focal

    focal? : object

    Defined in types.ts:186

    Zoom to the given point on the panzoom element. This point is expected to be relative to the panzoom element's dimensions and is unrelated to the parent dimensions.

    Type declaration:

    • x: number

    • y: number


    maxScale

    maxScale? : number (Default: 4)

    Defined in types.ts:190

    The maximum scale when zooming


    minScale

    minScale? : number (Default: 0.125)

    Defined in types.ts:188

    The minimum scale when zooming


    step

    step? : number (Default: 0.3)

    Defined in types.ts:192

    The step affects zoom calculation when zooming with a mouse wheel, when pinch zooming, or when using zoomIn/zoomOut


    PanzoomObject

    These methods are available after initializing Panzoom

    bind()

    bind: function

    Defined in types.ts:213

    Bind the default down, move, and up event listeners to the Panzoom element. This does not normally need to be called. It gets called by default when creating a new Panzoom object, but can be skipped with the noBind option.

    Signature with return type:

    ▸ (): void


    destroy()

    destroy: function

    Defined in types.ts:215

    Remove all event listeners bound to the the Panzoom element

    Signature with return type:

    ▸ (): void


    eventNames()

    eventNames: object

    Defined in types.ts:221

    This object exposes the event names used by Panzoom, depending on the current browser's support for Pointer or Touch events.

    Signature with return type:

    • down: string

    • move: string

    • up: string


    getOptions()

    getOptions: function

    Defined in types.ts:227

    Returns a copy of the current options object

    Signature with return type:

    ▸ (): PanzoomOptions


    getPan()

    getPan: function

    Defined in types.ts:223

    Get the current x/y translation

    Signature with return type:

    ▸ (): object

    • x: number

    • y: number


    getScale()

    getScale: function

    Defined in types.ts:225

    Get the current scale

    Signature with return type:

    ▸ (): number


    pan()

    pan: function

    Defined in types.ts:238

    Pan the Panzoom element to the given x and y coordinates

    // Translates the element to 50px, 100px
    panzoom.pan(50, 100)
    // Pans the element right 10px and down 10px from its current position
    panzoom.pan(10, 10, { relative: true })
    

    Signature with return type:

    ▸ (x: number | string, y: number | string, panOptions?: PanOptions): CurrentValues

    Parameters:

    Name Type
    x number | string
    y number | string
    panOptions? PanOptions

    reset()

    reset: function

    Defined in types.ts:251

    Reset the pan and zoom to startX, startY, and startScale. Animates by default, ignoring the global option. Pass { animate: false } to override. Reset ignores the disablePan, disableZoom, and panOnlyWhenZoomed options. Pass { force: false } to override.

    panzoom.reset()
    panzoom.reset({ animate: false })
    

    Signature with return type:

    ▸ (resetOptions?: PanzoomOptions): CurrentValues

    Parameters:

    Name Type
    resetOptions? PanzoomOptions

    setOptions()

    setOptions: function

    Defined in types.ts:253

    Change options for the Panzoom instance

    Signature with return type:

    ▸ (options?: PanzoomOptions): void

    Parameters:

    Name Type
    options? PanzoomOptions

    setStyle()

    setStyle: function

    Defined in types.ts:255

    A convenience method for setting prefixed styles on the Panzoom element

    Signature with return type:

    ▸ (name: string, value: string): void

    Parameters:

    Name Type
    name string
    value string

    zoom()

    zoom: function

    Defined in types.ts:264

    Zoom the Panzoom element to the given scale

    panzoom.zoom(2.2)
    panzoom.zoom(2.2, { animate: true })
    

    Signature with return type:

    ▸ (scale: number, zoomOptions?: ZoomOptions): CurrentValues

    Parameters:

    Name Type
    scale number
    zoomOptions? ZoomOptions

    zoomIn()

    zoomIn: function

    Defined in types.ts:275

    Zoom in using the predetermined increment set in options. Animates by default, ignoring the global option. Pass { animate: false } to override.

    panzoom.zoomIn()
    panzoom.zoomIn({ animate: false })
    

    Signature with return type:

    ▸ (zoomOptions?: ZoomOptions): CurrentValues

    Parameters:

    Name Type
    zoomOptions? ZoomOptions

    zoomOut()

    zoomOut: function

    Defined in types.ts:286

    Zoom out using the predetermined increment set in options. Animates by default, ignoring the global option. Pass { animate: false } to override.

    panzoom.zoomOut()
    panzoom.zoomOut({ animate: false })
    

    Signature with return type:

    ▸ (zoomOptions?: ZoomOptions): CurrentValues

    Parameters:

    Name Type
    zoomOptions? ZoomOptions

    zoomToPoint()

    zoomToPoint: function

    Defined in types.ts:297

    Zoom the Panzoom element to a focal point using the given pointer/touch/mouse event or constructed point. The clientX/clientY values should be calculated the same way as a pointermove event on the Panzoom element's parent.

    panzoom.zoomToPoint(1.2, pointerEvent)
    

    Signature with return type:

    ▸ (scale: number, point: object, zoomOptions?: ZoomOptions): CurrentValues

    Parameters:

    scale: number

    point: object

    Name Type
    clientX number
    clientY number

    Optional zoomOptions: ZoomOptions


    zoomWithWheel()

    zoomWithWheel: function

    Defined in types.ts:326

    Zoom the Panzoom element to a focal point using the given WheelEvent

    This is a convenience function that may not handle all use cases. Other cases should handroll solutions using the zoomToPoint method or the zoom method's focal option.

    Note: the focal point zooming pan adjustment is not affected by the disablePan option.

    // Bind to mousewheel
    elem.parentElement.addEventListener('wheel', panzoom.zoomWithWheel)
    // Bind to shift+mousewheel
    elem.parentElement.addEventListener('wheel', function (event) {
      if (!event.shiftKey) return
      // Panzoom will automatically use `deltaX` here instead
      // of `deltaY`. On a mac, the shift modifier usually
      // translates to horizontal scrolling, but Panzoom assumes
      // the desired behavior is zooming.
      panzoom.zoomWithWheel(event)
    })
    

    Signature with return type:

    ▸ (event: WheelEvent, zoomOptions?: ZoomOptions): CurrentValues

    Parameters:

    Name Type
    event WheelEvent
    zoomOptions? ZoomOptions

    CurrentValues

    Optional isSVG

    isSVG? : boolean

    Defined in types.ts:203


    scale

    scale: number

    Defined in types.ts:202


    x

    x: number

    Defined in types.ts:200


    y

    y: number

    Defined in types.ts:201

    Events

    The following events are available as custom events on the panzoom element using the native CustomEvent API. Add listeners the same way you would any other event.

    elem.addEventListener('panzoomchange', (event) => {
      console.log(event.detail) // => { x: 0, y: 0, scale: 1 }
    })
    

    Notes about all events

    • The event object passed as an argument to the listener will always have a detail property with the current x, y, and scale values.
    • Events can be silenced when the silent option is set to true, either globally or when passed to pan, any zoom method, or reset.
    • Avoid putting too much logic in these event handlers as it could effect the performance of panning or zooming.

    "panzoomstart"

    Fired when the user starts a move or pinch zoom gesture on mobile.

    "panzoomchange"

    Fired whenever there is a pan, zoom, or reset. Note that direct calls to options.setTransform do not fire this event.

    "panzoomzoom"

    Fired whenever the zoom is changed by any Panzoom zoom method, directly or internally.

    "panzoompan"

    Fired whenever the zoom is changed by the pan method, directly or internally.

    "panzoomend"

    Fired when the user finishes a move or finishes a pinch zoom gesture on mobile.

    "panzoomreset"

    Fired whenever reset is called.

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