@malkomich/viewerjs

v2.0.0-rc.3

Published

3 years ago

JavaScript image viewer.

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malkomich

viewerjs viewer image canvas viewer.js gallery pictures html css javascript front-end web malkomich

ViewerJS

JavaScript image viewer.

Website

Features

Supports 42 options
Supports 23 methods
Supports 9 events
Supports hidden source canvas
Supports modal and inline modes
Supports touch
Supports move
Supports zoom
Supports rotation
Supports scale (flip)
Supports keyboard
Cross-browser support

Main

dist/
├── viewerjs.css
├── viewerjs.min.css   (compressed)
├── viewerjs.js        (UMD)
├── viewerjs.min.js    (UMD, compressed)
├── viewerjs.common.js (CommonJS, default)
└── viewerjs.esm.js    (ES Module)

Getting started

Installation

npm install viewerjs

In browser:

<link  href="/path/to/viewerjs.css" rel="stylesheet">
<script src="/path/to/viewerjs.js"></script>

The cdnjs provides CDN support for ViewerJS's CSS and JavaScript. You can find the links here.

Usage

Syntax

new Viewer(element[, options])

element
- Type: HTMLElement
- The target image or container of images for viewing.
options (optional)
- Type: Object
- The options for viewing. Check out the available options.

Example

<!-- a block container is required -->
<div>
  <img id="image" src="picture.jpg" alt="Picture">

  <img id="canvas-image" data-src="picture.jpg" data-alt="Picture">
</div>

<div>
  <ul id="images">
    <li><img src="picture-1.jpg" alt="Picture 1"></li>
    <li><img src="picture-2.jpg" alt="Picture 2"></li>
    <li><img src="picture-3.jpg" alt="Picture 3"></li>
  </ul>
</div>

<div>
  <ul id="canvas-images">
    <li><canvas data-src="picture-1.jpg" data-alt="Picture 1"></li>
    <li><canvas data-src="picture-2.jpg" data-alt="Picture 2"></li>
    <li><canvas data-src="picture-3.jpg" data-alt="Picture 3"></li>
  </ul>
</div>

// You should import the CSS file.
// import 'viewerjs/dist/viewerjs.css';
import Viewer from 'viewerjs';

// View an image
const viewer = new Viewer(document.getElementById('image'), {
  inline: true,
  viewed() {
    viewer.zoomTo(1);
  },
});

const canvasViewer = new Viewer(document.getElementById('canvas-image'), {
  inline: true,
  viewed() {
    viewer.zoomTo(1);
  },
});
// Then, show the image by click it, or call `viewer.show()`.

// View a list of images
const gallery = new Viewer(document.getElementById('images'));

const canvasGallery = new Viewer(document.getElementById('canvas-images'));
// Then, show one image by click it, or call `gallery.show()`.

Keyboard support

Only available in modal mode.

Esc: Exit full screen or close the viewer or exit modal mode or stop play.
Space: Stop play.
←: View the previous image.
→: View the next image.
↑: Zoom in the image.
↓: Zoom out the image.
Ctrl + 0: Zoom out to initial size.
Ctrl + 1: Zoom in to natural size.

⬆ back to top

Options

You may set viewer options with new Viewer(image, options). If you want to change the global default options, You may use Viewer.setDefaults(options).

backdrop

Type: Boolean or String
Default: true

Enable a modal backdrop, specify static for a backdrop which doesn't close the modal on click.

button

Type: Boolean
Default: true

Show the button on the top-right of the viewer.

navbar

Type: Boolean or Number
Default: true
Options:
- 0 or false: hide the navbar
- 1 or true: show the navbar
- 2: show the navbar only when the screen width is greater than 768 pixels
- 3: show the navbar only when the screen width is greater than 992 pixels
- 4: show the navbar only when the screen width is greater than 1200 pixels

Specify the visibility of the navbar.

title

Type: Boolean or Number or Function or Array
Default: true
Options:
- 0 or false: hide the title
- 1 or true or Function or Array: show the title
- 2: show the title only when the screen width is greater than 768 pixels
- 3: show the title only when the screen width is greater than 992 pixels
- 4: show the title only when the screen width is greater than 1200 pixels
- Function: customize the title content
- [Number, Function]: the first element indicate the visibility, the second element customize the title content

Specify the visibility and the content of the title.

The name comes from the alt attribute of an image element or the image name parsed from URL.

For example, title: 4 equals to:

new Viewer(image, {
  title: [4, (image, imageData) => `${image.alt} (${imageData.naturalWidth} × ${imageData.naturalHeight})`]
});

toolbar

Type: Boolean or Number or Object
Default: true
Options:
- 0 or false: hide the toolbar.
- 1 or true: show the toolbar.
- 2: show the toolbar only when the screen width is greater than 768 pixels.
- 3: show the toolbar only when the screen width is greater than 992 pixels.
- 4: show the toolbar only when the screen width is greater than 1200 pixels.
- { key: Boolean | Number }: show or hide the toolbar.
- { key: String }: customize the size of the button.
- { key: Function }: customize the click handler of the button.
- { key: { show: Boolean | Number, size: String, click: Function }: customize each property of the button.
- Available keys: "zoomIn", "zoomOut", "oneToOne", "reset", "prev", "play", "next", "rotateLeft", "rotateRight", "flipHorizontal" and "flipVertical".
- Available sizes: "small", "medium" (default) and "large".

Specify the visibility and layout of the toolbar its buttons.

For example, toolbar: 4 equals to:

new Viewer(image, {
  toolbar: {
    zoomIn: 4,
    zoomOut: 4,
    oneToOne: 4,
    reset: 4,
    prev: 4,
    play: {
      show: 4,
      size: 'large',
    },
    next: 4,
    rotateLeft: 4,
    rotateRight: 4,
    flipHorizontal: 4,
    flipVertical: 4,
  },
});

className

Type: String
Default: ''

Custom class name(s) to add to the viewer's root element.

container

Type: Element or String
Default: 'body'
An element or a valid selector for Document.querySelector

The container to put the viewer in modal mode.

Only available when the inline option is set to false.

filter

Type: Function
Default: null

Filter the images for viewing (should return true if the image is viewable).

For example:

new Viewer(image, {
  filter(image) {
    return image.complete;
  },
});

fullscreen

Type: Boolean
Default: true

Enable to request full screen when play.

Requires the browser supports Full Screen API.

initialViewIndex

Type: Number
Default: 0

Define the initial index of image for viewing.

Also used as the default parameter value of the view method.

inline

Type: Boolean
Default: false

Enable inline mode.

interval

Type: Number
Default: 5000

The amount of time to delay between automatically cycling an image when playing.

keyboard

Type: Boolean
Default: true

Enable keyboard support.

loading

Type: Boolean
Default: true

Indicate if show a loading spinner when load image or not.

loop

Type: Boolean
Default: true

Indicate if enable loop viewing or not.

If the current image is the last one, then the next one to view is the first one, and vice versa.

minWidth

Type: Number
Default: 200

Define the minimum width of the viewer.

Only available in inline mode (set the inline option to true).

minHeight

Type: Number
Default: 100

Define the minimum height of the viewer.

Only available in inline mode (set the inline option to true).

movable

Type: Boolean
Default: true

Enable to move the image.

rotatable

Type: Boolean
Default: true

Enable to rotate the image.

scalable

Type: Boolean
Default: true

Enable to scale the image.

zoomable

Type: Boolean
Default: true

Enable to zoom the image.

zoomOnTouch

Type: Boolean
Default: true

Enable to zoom the current image by dragging on the touch screen.

zoomOnWheel

Type: Boolean
Default: true

Enable to zoom the image by wheeling mouse.

slideOnTouch

Type: Boolean
Default: true

Enable to slide to the next or previous image by swiping on the touch screen.

toggleOnDblclick

Type: Boolean
Default: true

Indicate if toggle the image size between its natural size and initial size when double click on the image or not.

In other words, call the toggle method automatically when double click on the image.

Requires dblclick event support.

tooltip

Type: Boolean
Default: true

Show the tooltip with image ratio (percentage) when zoom in or zoom out.

transition

Type: Boolean
Default: true

Enable CSS3 Transition for some special elements.

zIndex

Type: Number
Default: 2015

Define the CSS z-index value of viewer in modal mode.

zIndexInline

Type: Number
Default: 0

Define the CSS z-index value of viewer in inline mode.

zoomRatio

Type: Number
Default: 0.1

Define the ratio when zoom the image by wheeling mouse.

minZoomRatio

Type: Number
Default: 0.01

Define the min ratio of the image when zoom out.

maxZoomRatio

Type: Number
Default: 100

Define the max ratio of the image when zoom in.

url

Type: String or Function
Default: 'src'

Define where to get the original image URL for viewing.

If it is a string, it should be one of the attributes of each image element. If it is a function, it should return a valid image URL.

For example:

<img src="picture.jpg?size=160">

new Viewer(image, {
  url(image) {
    return image.src.replace('?size=160', '');
  },
});

ready

Type: Function
Default: null

A shortcut of the ready event.

show

Type: Function
Default: null

A shortcut of the show event.

shown

Type: Function
Default: null

A shortcut of the shown event.

hide

Type: Function
Default: null

A shortcut of the hide event.

hidden

Type: Function
Default: null

A shortcut of the hidden event.

view

Type: Function
Default: null

A shortcut of the view event.

viewed

Type: Function
Default: null

A shortcut of the viewed event.

zoom

Type: Function
Default: null

A shortcut of the zoom event.

zoomed

Type: Function
Default: null

A shortcut of the zoomed event.

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Methods

All methods allow chain composition.

As there are some asynchronous processes when start the viewer, you should call a method only when it is available, see the following lifecycle:

new Viewer(image, {
  ready() {
    // 2 methods are available here: "show" and "destroy".
  },
  shown() {
    // 9 methods are available here: "hide", "view", "prev", "next", "play", "stop", "full", "exit" and "destroy".
  },
  viewed() {
    // All methods are available here except "show".
    this.viewer.zoomTo(1).rotateTo(180);
  }
});

show([immediate])

immediate (optional):
- Type: Boolean
- Default: false
- Indicates if show the viewer immediately or not.

Show the viewer.

Only available in modal mode.

hide([immediate])

immediate (optional):
- Type: Boolean
- Default: false
- Indicates if hide the viewer immediately or not.

hide the viewer.

Only available in modal mode.

view([index])

index (optional):
- Type: Number
- Default: 0 (inherits from the initialViewIndex option)
- The index of the image for viewing

View one of the images with image's index. If the viewer is not shown, will show the viewer first.

viewer.view(1); // View the second image

prev([loop=false])

loop (optional):
- Type: Boolean
- Default: false
- Indicate if turn to view the last one when it is the first one at present.

View the previous image.

next([loop=false])

loop (optional):
- Type: Boolean
- Default: false
- Indicate if turn to view the first one when it is the last one at present.

View the next image.

move(offsetX[, offsetY])

offsetX:
- Type: Number
- Moving size (px) in the horizontal direction
offsetY (optional):
- Type: Number
- Moving size (px) in the vertical direction.
- If not present, its default value is offsetX

Move the image with relative offsets.

viewer.move(1);
viewer.move(-1, 0); // Move left
viewer.move(1, 0);  // Move right
viewer.move(0, -1); // Move up
viewer.move(0, 1);  // Move down

moveTo(x[, y])

x:
- Type: Number
- The left value of the image
y (optional):
- Type: Number
- The top value of the image
- If not present, its default value is x.

Move the image to an absolute point.

zoom(ratio[, hasTooltip])

ratio:
- Type: Number
- Zoom in: requires a positive number (ratio > 0)
- Zoom out: requires a negative number (ratio < 0)
hasTooltip (optional):
- Type: Boolean
- Default: false
- Show tooltip

Zoom the image with a relative ratio

viewer.zoom(0.1);
viewer.zoom(-0.1);

zoomTo(ratio[, hasTooltip])

ratio:
- Type: Number
- Requires a positive number (ratio > 0)
hasTooltip (optional):
- Type: Boolean
- Default: false
- Show tooltip

Zoom the image to an absolute ratio.

viewer.zoomTo(0); // Zoom to zero size (0%)
viewer.zoomTo(1); // Zoom to natural size (100%)

rotate(degree)

degree:
- Type: Number
- Rotate right: requires a positive number (degree > 0)
- Rotate left: requires a negative number (degree < 0)

Rotate the image with a relative degree.

viewer.rotate(90);
viewer.rotate(-90);

rotateTo(degree)

degree:
- Type: Number

Rotate the image to an absolute degree.

viewer.rotateTo(0); // Reset to zero degree
viewer.rotateTo(360); // Rotate a full round

scale(scaleX[, scaleY])

scaleX:
- Type: Number
- Default: 1
- The scaling factor to apply on the abscissa of the image
- When equal to 1 it does nothing.
scaleY (optional):
- Type: Number
- The scaling factor to apply on the ordinate of the image
- If not present, its default value is scaleX.

Scale the image.

viewer.scale(-1); // Flip both horizontal and vertical
viewer.scale(-1, 1); // Flip horizontal
viewer.scale(1, -1); // Flip vertical

scaleX(scaleX)

scaleX:
- Type: Number
- Default: 1
- The scaling factor to apply on the abscissa of the image
- When equal to 1 it does nothing

Scale the abscissa of the image.

viewer.scaleX(-1); // Flip horizontal

scaleY(scaleY)

scaleY:
- Type: Number
- Default: 1
- The scaling factor to apply on the ordinate of the image
- When equal to 1 it does nothing

Scale the ordinate of the image.

viewer.scaleY(-1); // Flip vertical

play([fullscreen])

fullscreen (optional):
- Type: Boolean
- Default: false
- Indicate if request fullscreen or not.

Play the images.

stop()

Stop play.

full()

Enter modal mode.

Only available in inline mode.

exit()

Exit modal mode.

Only available in inline mode.

tooltip()

Show the current ratio of the image with percentage.

Requires the tooltip option set to true.

toggle()

Toggle the image size between its natural size and initial size.

Used by the toggleOnDblclick option.

reset()

Reset the image to its initial state.

update()

Update the viewer instance when the source images changed (added, removed or sorted).

If you load images dynamically (with XMLHTTPRequest), you can use this method to add the new images to the viewer instance.

destroy()

Destroy the viewer and remove the instance.

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Events

All events can access the viewer instance with this.viewer in its handler.

Be careful to use these events in other component which has the same event names, e.g.: Bootstrap's modal.

let viewer;

image.addEventListener('viewed', function () {
  console.log(this.viewer === viewer);
  // > true
});

viewer = new Viewer(image);

ready

This event fires when a viewer instance is ready for viewing.

In modal mode, this event will not be triggered until you click on one of the images.

show

This event fires when the viewer modal starts to show.

Only available in modal mode.

shown

This event fires when the viewer modal has shown.

Only available in modal mode.

hide

This event fires when the viewer modal starts to hide.

Only available in modal mode.

hidden

This event fires when the viewer modal has hidden.

Only available in modal mode.

view

event.detail.originalImage:
- Type: HTMLImageElement
- The original image.
event.detail.index:
- Type: Number
- The index of the original image.
event.detail.image:
- Type: HTMLImageElement
- The current image (a clone of the original image).

This event fires when a viewer starts to show (view) an image.

viewed

event.detail: the same as the view event.

This event fires when a viewer has shown (viewed) an image.

zoom

event.detail.originalEvent:
- Type: Event
- Options: wheel, touchmove.
event.detail.oldRatio:
- Type: Number
- The old (current) ratio of the image.
event.detail.ratio:
- Type: Number
- The new (next) ratio of the image (imageData.width / imageData.naturalWidth).

This event fires when a viewer starts to zoom (in or out) an image.

zoomed

event.detail: the same as the zoom event.

This event fires when a viewer has zoomed (in or out) an image.

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No conflict

If you have to use other viewer with the same namespace, just call the Viewer.noConflict static method to revert to it.

<script src="other-viewer.js"></script>
<script src="viewerjs.js"></script>
<script>
  Viewer.noConflict();
  // Code that uses other `Viewer` can follow here.
</script>

Browser support

Chrome (latest)
Firefox (latest)
Safari (latest)
Opera (latest)
Edge (latest)

Contributing

Please read through our contributing guidelines.

Versioning

Maintained under the Semantic Versioning guidelines.

License

⬆ back to top

Published

Vulnerabilities

Links

Maintainers

Keywords

Readme

ViewerJS

Table of contents

Features

Main

Getting started

Installation

Usage

Syntax

Example

Keyboard support

Options

backdrop

button

navbar

title

toolbar

className

container

filter

fullscreen

initialViewIndex

inline

interval

keyboard

loading

loop

minWidth

minHeight

movable

rotatable

scalable

zoomable

zoomOnTouch

zoomOnWheel

slideOnTouch

toggleOnDblclick

tooltip

transition

zIndex

zIndexInline

zoomRatio

minZoomRatio

maxZoomRatio

url

ready

show

shown

hide

hidden

view

viewed

zoom

zoomed

Methods

show([immediate])

hide([immediate])

view([index])

prev([loop=false])

next([loop=false])

move(offsetX[, offsetY])

moveTo(x[, y])

zoom(ratio[, hasTooltip])

zoomTo(ratio[, hasTooltip])

rotate(degree)

rotateTo(degree)

scale(scaleX[, scaleY])

scaleX(scaleX)

scaleY(scaleY)

play([fullscreen])

stop()

full()

exit()

tooltip()

toggle()