Image Scale

Scale images to fit or fill any target container via two simple properties: scale and align.

This plugin is greatly inspired from Sproutcore SC.ImageView.

Installation

image-scale depends on jQuery. To use it, include this in your page :

<script src="jquery.js" type="text/javascript"></script>
<script src="image-scale.js" type="text/javascript"></script>

Usage

If you want to identify the images that you want to scale, you can add a class to them. In this example we are adding a class call scale.

You can also set the data-scale and data-align attributes directly to the images if you want to override the default setting.

<div class="image-container">
  <img class="scale" data-scale="best-fit-down" data-align="center" src="img/example.jpg">
</div>

Now add this JavaScript code to your page :

$(function() {
  $("img.scale").imageScale();
});

You're done.

Properties

scale

Determines how the image will scale to fit within its containing space. Possible values:

• fill - stretches or compresses the source image to fill the target frame
• best-fill - fits the shortest side of the source image within the target frame while maintaining the original aspect ratio
• best-fit - fits the longest edge of the source image within the target frame while maintaining the original aspect ratio
• best-fit-down - same as best-fit but will not stretch the source if it is smaller than the target
• none - the source image is left unscaled

Type: String
Default: best-fill

align

Align the image within its frame. Possible values:

• left
• right
• center
• top
• bottom
• top-left
• top-right
• bottom-left
• bottom-right

Type: String
Default: center

parent

A jQuery Object against which the image size will be calculated. If null, the parent of the image will be used.

Type: jQuery Object
Default: null

hideParentOverflow

A boolean determining if the parent should hide its overflow.

Type: Boolean
Default: true

fadeInDuration

A duration in milliseconds determining how long the fadeIn animation will run when your image is scale for the firstTime.

Set it to 0 if you don't want any animation.

Type: Number or String
Default: 0

rescaleOnResize

A boolean indicating if the image size should be rescaled when the window is resized.

The window size is checked using requestAnimationFrame for good performance.

Type: Boolean
Default: false

didScale

A function that will be call each time the receiver is scaled.

Example:

$images.imageScale({ 
  didScale: function(firstTime, options) {
    console.log('did scale img: ', this.element);
  }
});

Type: Function
Parameters: 
  - firstTime {Boolean} true if the image was scale for the first time.
  - options {Object} the options passed to the scale method.

debug

A number indicating the debug level :

0. silent
1. error
2. error & warning
3. error & warning & notice

Type: Number
Default: 0

Methods

scale

Main method. Used to scale the images.

When rescaleOnResize is set to true, this method is executed each time the windows size changes.

If rescaleOnResize is set to false, you may want to call it manually. Here is an example on how you should do it:

$image.imageScale('scale');

destroy

Removes the data for the element.

Here is an example on how you can call the destroy method:

$image.imageScale('destroy');

Demo

See it in action on our home page.

You can also check out the Sproutcore Automatic Image Scaling demo to understand the difference between all the different options.

Size

Original Size: 3.91KB gzipped (13.99KB uncompressed)

Compiled Size: 1.8KB gzipped (4.42KB uncompressed)

Author

Nicolas Badia

• https://twitter.com/@nicolas_badia
• https://github.com/nicolasbadia

Copyright and license

Copyright 2013-2015 GestiXi under The MIT License (MIT).