Wheelzoom

A small script for zooming IMG elements with the mousewheel/trackpad. Wheelzoom works by replacing the img element's src with a transparent image, then using the original src as a background image, which can be sized and positioned. Wheelzoom is dependency free, doesn't add any extra elements to the DOM, or change the positioning of the IMG element.

Usage:

wheelzoom(document.querySelectorAll('img'));
// or
wheelzoom(document.querySelectorAll('img'), {zoom:0.05});
// zoom sets the zoom percent.

License

MIT License

Supported Browsers:

Chrome, Safari, Opera, FireFox 17+, IE9+.

Changelog:

v.4.0.1 - 2019/08/13

• Added initialX and initialY for setting the initial zoomed coordinates

v.4.0.0 - 2018/10/09

• Replaced canvas data URI with base64 svg for creating placeholder
• Dropped IE9 support

v.3.1.3 - 2018/01/31

• Added 'initialZoom' option. Resolves #32

v.3.1.2 - 2017/04/20

• Added package.json & added to NPM.

v.3.1.0 - 2017/04/10

• Added 'maxZoom' option for maximum zoom level.

v.3.0.4 - 2015/12/15

• Automatically account for changes to the img src, to avoid requiring manually calling destroy and reapply.

v.3.0.3 - 2015/09/05

• Fixed zoom positioning issue in Firefox. Fixes #17
• Fixed error when calling destroy in Firefox. Fixes #16
• Removed debugging statement. Fixes #15

v.3.0.2 - 2015/09/05

• Fixed lint warnings and bug introduced in 3.0.1

v.3.0.1 - 2015/09/05

• Fixed issue with src URLs that contain single quotes. Fixes #13.

v.3.0.0 - 2014/10/14

• Removed jQuery dependency
• Added 'wheelzoom.destroy' event for removing changes that wheelzoom has made to an element.

v.2.0.1 - 2014/9/9

• Merged bugfix to wrap background-image path in quotes. Ref #8.

v.2.0.0 - 2014/4/17

• Simplified by dropping support for having border and padding on the img element. Borders and/or padding should be applied to the parent element, rather than the img element.

v.1.1.3 - 2014/4/13

• Minor code improvement.

v.1.1.2 - 2013/1/31

• Fixed bug with unzoom trigger.

v1.1.1 - 2013/1/29

• Added trigger to unzoom image:

	$('#example').trigger('wheelzoom.reset')

v1.1.0 - 2012/11/28

• Added dragging.

v1.0 - 2012/11/26

• Initial release.