Home

Awesome

ngx-image-zoom

npm version

Project status

This version is only tested with Angular15. Moving forward this library may or may not work on older versions of Angular anymore.

Still in early development, more features are planned and incoming. Should be in a working state right now but it's not tested in lots of different setups yet.

Breaking changes in version 0.5.0, see changelog for details.

Demonstration of available features available here.

Breaking changes in version 2.0.0, see changelog for details.

Demonstration of available features available (here).

About

NgxImageZoom is inspired by angular2-image-zoom and JQuery libraries such as jQuery Zoom and elevateZoom-plus but a pure Angular2+ implementation of similar concepts. This plugin works with both URLs to images and in-line images (Data URI).

Available options

All settings except thumbImage are optional. If no fullImage is provided the thumbImage will be used as the high resolution version as well.

OptionDefault valueDescription
thumbImagenone(Required) The smaller version of the image that will be shown when there's no interaction by the user. String or SafeUrl type.
fullImagenoneThe full resolution version of the image to be used when zooming. If not supplied thumbImage will be used. String or SafeUrl type.
magnification1The zoom factor to be used by default. 1 means we use the fullImage at its actual resolution.
zoomMode'hover'The mode of zooming to use, these are explained in a table below.
enableScrollZoomfalseBoolean that toggles if the mouse wheel should be captured when hovering over the image to adjust magnification.
scrollStepSize0.1When using scroll zoom this setting determines how big steps each scroll changes the zoom.
enableLensfalseIf enabled only a small portion around the mouse cursor will actually magnify instead of the entire image area.
lensWidth100Width of the lens, if enabled.
lensHeight100Height of the lens, if enabled.
circularLensfalseMake the lens circular instead of square. This will only look good if width and height are equal.
minZoomRatiobaseRatioLower limit on how much zoom can be applied with scrollZoom enabled. See below for details.
maxZoomRatio2Upper limit on how much zoom can be applied with scrollZoom enabled. See below for details.
altText''alt attribute of the thumb and full image.
titleText''title attribute of the thumb and full image.

Zoom modes

ModeDescription
hoverWhenever the mouse cursor moves over the thumbnail it will show the zoomed image until it leaves the thumbnail.
clickSimilar to hover but it only starts zooming if the user clicks the image. Moving the cursor away from the image disables it again.
toggleA click in the image will zoom at the point of the cursor. Another click will restore the small image.
toggle-clickCombination of toggle and click. A click in the image will start zooming. Another click or moving the cursor away from the image will restore the small image.
toggle-freezeFirst click enables hover mode, second click freezes the zoomed image where it is, third click restores thumbnail.
hover-freezeWhenever the mouse cursor moves over the thumbnail it will show the zoomed image, first click freezes the zoomed image where it is, second click restores thumbnail.

Zoom ratio

The zoom ratio used in the minZoomRatio and maxZoomRatio settings refer to the relative size of the thumbnail and the full size image. The baseRatio default value is the calculated ratio that would make the zoomed image equal in size to the thumbnail. For example, if the full size image is 10x larger than the thumbnail, then minZoomRatio will default to 0.1, as in the full size image can at its smallest be shown at 0.1 times its original size. The default value for maxZoomRatio being 1 means the largest the fullSize image can appear is twice its original size.

Available output

The component outputs the follow events that can be triggered on.

Event nameDescription
zoomScrollWhenever the user changes the zoom level using the scroll wheel this event will fire with the current zoom ratio (see above).
zoomPositionWhen the point on where the zoom is focused changes this event emits a Coord event (interface exported from the module) with X/Y in pixels relative thumbnails top left corner. Practically whenever the user moves the mouse cursor over the image.
imagesLoadedWhen the thumbnail and fullImage are loaded and ready to be used this output emits "true". It will emit "false" if images are changed and on initial setup

Installation

To install this library, run:

$ npm install ngx-image-zoom --save

Using this library

From your Angular AppModule:

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppComponent } from './app.component';

// Import the library
import { NgxImageZoomModule } from 'ngx-image-zoom';

@NgModule({
    declarations: [AppComponent],
    imports: [
        BrowserModule,
        NgxImageZoomModule, // <-- Add this line
    ],
    providers: [],
    bootstrap: [AppComponent],
})
export class AppModule {}

Once the library is imported, you can use its component in your Angular application:

<!-- You can now use NgxImageZoom component in app.component.html -->
<h1>
  {{title}}
</h1>
<lib-ngx-image-zoom
    [thumbImage]=myThumbnail
    [fullImage]=myFullresImage
></lib-ngx-image-zoom>

License

MIT © Mathias Wittlock