Details

Download
Version 1.2.1
Last updated 6th October 2009
Requirements
Demo View demo page
Links
License BSD License
Changelog
1.2.1
  • Added support for latest versions of Prototype & script.aculo.us (1.6.1.0 & 1.8.2 respectively). Changes provided by Tom Hirashima.
  • No-longer package prototype & script.aculo.us with the release
  • Changed tests to use google ajax libraries api to load prototype & script.aculo.us
  • Added option to not auto include the cropper CSS file
  • #00008 - Fixed bug: Dynamic include of cropper CSS expected cropper.js and failed when using cropper.uncompressed.js
  • #00028 - Fixed bug: Doesn't work with latest script.aculo.us - Fix by Tom Hirashima
  • #00030 - Fixed bug: Doesn't work in Firefox 3.5 (CSS include issue)
  • #00007 - Fixed bug: onEndCrop isn't called when moving with keys
  • #00011 - Fixed bug: The image that is to be cropped does not show in IE6.0 -- included CSS fix
  • Tidied up source code & fixed issues that jslint found so it will compress better
1.2.0
  • Added id to the preview image element using 'imgCrop_[originalImageID]'
  • #00001 - Fixed bug: Doesn't account for scroll offsets
  • #00009 - Fixed bug: Placing the cropper inside differently positioned elements causes incorrect co-ordinates and display
  • #00013 - Fixed bug: I-bar cursor appears on drag plane
  • #00014 - Fixed bug: If ID for image tag is not found in document script throws error
  • Fixed bug with drag start co-ordinates if wrapper element has moved in browser (e.g. dragged to a new position)
  • Fixed bug with drag start co-ordinates if image contained in a wrapper with scrolling - this may be buggy if image has other ancestors with scrolling applied (except the body)
  • #00015 - Fixed bug: When cropper removed and then reapplied onEndCrop callback gets called multiple times, solution suggestion from Bill Smith
  • Various speed increases & code cleanup which meant improved performance in Mac - which allowed removal of different overlay methods for IE and all other browsers, which led to a fix for:
  • #00010 - Fixed bug: Select area doesn't adhere to image size when image resized using img attributes
  • #00006 - Removed default behaviour of automatically setting a ratio when both min width & height passed, the ratioDimensions must be passed in
  • #00005 - Added ability to set maximum crop dimensions, if both min & max set as the same value then we'll get a fixed cropper size on the axes as appropriate and the resize handles will not be displayed as appropriate
  • Switched keydown for keypress for moving select area with cursor keys (makes for nicer action) - doesn't appear to work in Safari
1.1.3
  • Fixed wrong cursor on western handle in CSS
  • #00008 & #00003 - Added feature: Allow to set dimensions & position for cropper on load
  • #00002 - Fixed bug: Pressing 'remove cropper' twice removes image in IE
1.1.2
  • Fixed bugs with ratios when GCD is low (patch submitted by Andy Skelton)
1.1.1
  • Fixed bug with rendering issues fix in IE 5.5
  • Fixed bug with endCrop callback issues once cropper had been removed & reset in IE
1.1.0
  • Fixed bug with IE constantly trying to reload select area background image
  • Applied more robust fix to Safari & IE rendering issues
  • Added method to reset parameters - useful for when dynamically changing img the cropper is attached to
  • Added method to remove cropper from image
1.0.0
  • Initial verison

About

The JavaScript image cropper UI allows the user to crop an image using an interface with the same features and styling as found in commercial image editing software, and is is based on the Prototype JavaScript framework and script.aculo.us.

Initially I performed quite a lot of searching for some ready made solutions to meet my requirements, but found none that had the complete feature set that I required or any complete versions based on Prototype.

So after a week and a half of work, I present the JavaScript image cropper UI, built on Prototype & script.aculo.us.

Features

Screen shot of cropper in action

  • Un-obtrusive
  • Based on Prototype and script.aculo.us
  • Image editing package styling & functionality, the crop area functions and looks like those found in popular image editing software
  • Dynamic inclusion of required styles
  • Drag to draw areas
  • Shift drag to draw/resize areas as squares
  • Selection area can be moved
  • Selection area can be resized using resize handles
  • Allows dimension ratio limited crop areas
  • Allows minimum dimension crop areas
  • Allows maximum dimensions crop areas, if both min & max set as the same value then we'll get a fixed cropper size on the axes as appropriate and the resize handles will not be displayed as appropriate
  • Allows dynamic preview of resultant crop (if minimum width & height are provided), this is implemented as a subclass so can be removed if not required
  • Movement of selection area by arrow keys (shift + arrow key will move selection area by 10 pixels)
  • All operations stay within bounds of image
  • All functionality & display compatible with most popular browsers supported by Prototype, tested in:
    • PC: IE 6 & 5.5, Firefox 1.5, Opera 8.5 (see known issues) & 9.0b
    • MAC: Camino 1.0, Firefox 1.5, Safari 2.0

Usage

Extract to a directory of your choosing e.g. 'scripts/cropper/' and include the script and the required Prototype & script.aculo.us scripts:

Display code as plain text
HTML:
  1. <script type="text/javascript" src="scripts/cropper/lib/prototype.js" language="javascript"></script>
  2. <script type="text/javascript" src="scripts/cropper/lib/scriptaculous.js?load=effects,builder,dragdrop" language="javascript"></script>
  3. <script type="text/javascript" src="scripts/cropper/cropper.js" language="javascript"></script>

Options

ratioDim obj
The pixel dimensions to apply as a restrictive ratio, with properties x & y.
minWidth int
The minimum width for the select area in pixels.
minHeight int
The mimimum height for the select area in pixels.
maxWidth int
The maximum width for the select areas in pixels (if both minWidth & maxWidth set to same the width of the cropper will be fixed)
maxHeight int
The maximum height for the select areas in pixels (if both minHeight & maxHeight set to same the height of the cropper will be fixed)
displayOnInit int
Whether to display the select area on initialisation, only used when providing minimum width & height or ratio.
onEndCrop func
The callback function to provide the crop details to on end of a crop.
captureKeys boolean
Whether to capture the keys for moving the select area, as these can cause some problems at the moment.
onloadCoords obj
A coordinates object with properties x1, y1, x2 & y2; for the coordinates of the select area to display onload

The callback function

The callback function is a function that allows you to capture the crop co-ordinates when the user finished a crop movement, it is passed two arguments:

  • coords, obj, coordinates object with properties x1, y1, x2 & y2; for the coordinates of the select area.
  • dimensions, obj, dimensions object with properities width & height; for the dimensions of the select area.

An example function which outputs the crop values to form fields:

Display code as plain text
JavaScript:
  1. function onEndCrop( coords, dimensions ) {
  2.     $( 'x1' ).value = coords.x1;
  3.     $( 'y1' ).value = coords.y1;
  4.     $( 'x2' ).value = coords.x2;
  5.     $( 'y2' ).value = coords.y2;
  6.     $( 'width' ).value = dimensions.width;
  7.     $( 'height' ).value = dimensions.height;
  8. }

Basic interface

This basic example will attach the cropper UI to the test image and return crop results to the provided callback function.

Display code as plain text
HTML:
  1. <img src="test.jpg" alt="Test image" id="testImage" width="500" height="333" />
  2.  
  3.     <script type="text/javascript" language="javascript">
  4.     Event.observe( window, 'load', function() {
  5.         new Cropper.Img(
  6.             'testImage',
  7.             { onEndCrop: onEndCrop }
  8.         );
  9.     } );
  10. </script>

Minimum dimensions

You can apply minimum dimensions to a single axis or both, this example applies minimum dimensions to both axis.

Display code as plain text
HTML:
  1. <img src="test.jpg" alt="Test image" id="testImage" width="500" height="333" />
  2.  
  3. <script type="text/javascript" language="javascript">
  4.     Event.observe( window, 'load', function() {
  5.         new Cropper.Img(
  6.             'testImage',
  7.             {
  8.                 minWidth: 220,
  9.                 minHeight: 120,
  10.                 onEndCrop: onEndCrop
  11.             }
  12.         );
  13.     } );
  14. </script>

Select area ratio

You can apply a ratio to the selection area, this example applies a 4:3 ratio to the select area.

Display code as plain text
HTML:
  1. <img src="test.jpg" alt="Test image" id="testImage" width="500" height="333" />
  2.  
  3. <script type="text/javascript" language="javascript">
  4.     Event.observe( window, 'load', function() {
  5.         new Cropper.Img(
  6.             'testImage',
  7.             {
  8.                 ratioDim: {
  9.                     x: 220,
  10.                     y: 165
  11.                 },
  12.                 displayOnInit: true,
  13.                 onEndCrop: onEndCrop
  14.             }
  15.         );
  16.     } );
  17. </script>

With crop preview

You can display a dynamically produced preview of the resulting crop by using the ImgWithPreview subclass, a preview can only be displayed when we have a fixed size (set via minWidth & minHeight options). Note that the displayOnInit option is not required as this is the default behaviour when displaying a crop preview.

Display code as plain text
HTML:
  1. <img src="test.jpg" alt="Test image" id="testImage" width="500" height="333" />
  2. <div id="previewWrap"></div>
  3.  
  4. <script type="text/javascript" language="javascript">
  5.     Event.observe( window, 'load', function() {
  6.         new Cropper.ImgWithPreview(
  7.             'testImage',
  8.             {
  9.                 previewWrap: 'previewWrap',
  10.                 minWidth: 120,
  11.                 minHeight: 120,
  12.                 ratioDim: { x: 200, y: 120 },
  13.                 onEndCrop: onEndCrop
  14.             }
  15.         );
  16.     } );
  17. </script>

Known Issues

  • Safari animated gifs, only one of each will animate, this seems to be a known Safari issue.
  • After drawing an area and then clicking to start a new drag in IE 5.5 the rendered height appears as the last height until the user drags, this appears to be the related to another IE error (which has been fixed) where IE does not always redraw the select area properly.
  • Lack of CSS opacity support in Opera before version 9 mean we disable those style rules, if Opera 8 support is important you & you want the overlay to work then you can use the Opera rules in the CSS to apply a black PNG with 50% alpha transparency to replicate the effect.
  • Styling & borders on image, any CSS styling applied directly to the image itself (floats, borders, padding, margin, etc.) will cause problems with the cropper. The use of a wrapper element to apply these styles to is recommended.
  • overflow: auto or overflow: scroll on parent will cause cropper to burst out of parent in IE and Opera when applied (maybe Mac browsers too) I'm not sure why yet.

SEO Agency advanced JavaScript experience can enhance your site functionality. Adding the JavaScript Image Cropper is a good way to improve the user experience.

Next Steps

Download

Demo

View the demo pages for the JavaScript Image Cropper UI, using Prototype & script.aculo.us

Feature Requests & Bug Reports

Please check the existing list of feature requests & bugs and the discussion list before posting requests or reporting bugs.

Leave a Tip

If you find this code useful you can leave a donation towards the continued development & support.

Discussion

Note: Please only use the comments for general comments and the discussion list to discuss this code project (e.g. implementation queries, change suggestions etc.).

Comments

There have been 667 comments so far, join the discussion.

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620. Matt - 29th Oct 2009 - 4:37 pm

Thanks for the quick reply…i should of looked in FAQ….hopefully this will work well.

619. Dave - 28th Oct 2009 - 4:50 pm

Matt:
This is just a cropping UI it doesn’t give you a cropped picture. Please check the FAQ’s, there is a link to a .net example listed in there.

618. Matt - 28th Oct 2009 - 4:47 pm

Great code, will hopefully do what i need…however i do have a question.

I have managed to upload an image from the local machine, and then crop it, but what i now want to send the cropped image to a remote file server. IM still fairly new to VB.net and very new at js so i really dont have any ideas about how to grab the cropped result and maybe save it as a file and the local mahine? I would greatly appreciate any help…

617. Dave - 14th Oct 2009 - 1:46 pm

Chetali: If the JS is loading and it’s still not working that usually means the CSS isn’t being automatically included properly. There is a new option to disable this, so disable that and include the CSS yourself. If that doesn’t work please continue this discussion on the google group: http://groups.google.com/group/javascript-image-cropper-ui

616. chetali - 14th Oct 2009 - 1:20 pm

Dave,

Can you just let me know which functions in JS i need to check which actually displaye the croppping tool on the pic?
I wil try to debug it then

615. chetali - 14th Oct 2009 - 1:08 pm

Dave,
I have checked this. all the JS files are loaded.
the cropping tool does not appear.
The preview area (where we show cropped image) shows the complete picture. and drag tool to select a part of the picture is not available.

614. Dave - 14th Oct 2009 - 1:04 pm

Chetali: Well I don’t think that’s something that I’m able to debug not having access to Mozilla 2.0 over VPN. Unless you can provide more details of what actually doesn’t work (e.g. do you get JS errors, are you sure all JS & stylesheets are loaded correctly?) then I doubt I can help further.

613. chetali - 14th Oct 2009 - 1:01 pm

web vpn – it is virtual private network to access intranet sites on web (outside lan).
We are using Juniper network.
for IE, the cropping tool works fine. but not for Mozilla 2.0

612. Dave - 14th Oct 2009 - 12:44 pm

Chetali: What’s web vpn mozilla I can’t really find any info on it.

611. chetali - 14th Oct 2009 - 12:41 pm

This does not works in web vpn mozilla.
any idea?

610. Sean - 9th Oct 2009 - 8:52 am

Awesome script! All functionality is working using your samples on my side. When attempting to start and stop cropper via form buttons (rather than at window load, I’m having a bit of trouble.

Example:

function startCropper() {
new Cropper.ImgWithPreview(
‘testImage’,
{
minWidth: 180,
minHeight: 96,
ratioDim: { x: 720, y: 386 },
onEndCrop: onEndCrop,
previewWrap: ‘previewArea’
}
)
};

Then later:

Results:

When hitting the Crop button, Cropper starts for one frame, and then dies. I’m new to Javascript, so I’m sure its something totally boneheaded on my end.

Any insight is totally appreciated.

Sean

609. Dave - 8th Oct 2009 - 2:21 pm

Riss:

Can you please explain how you are loading the new images to crop, and if possible provide an example – please can you do this on the bug list: http://code.google.com/p/javascript-image-cropper-ui/issues/list

608. Riss - 8th Oct 2009 - 2:17 pm

Hello,
Great UI! I’m currently trying to implement it into my website.
Although is seems as if something doesn’t work correctly in IE7. It works fine when I refresh the complete page every time after cropping an image. But when I do not refresh the page and load the next image to crop, the crop values do not change, all the crop values (coordinates etc) from the previous image I cropped are used again.
This only happens when using IE 7, it works fine in FF and Chrome without refreshing the page every time between images.
Is there something I can do to make it work in IE as well?
Grtz, Riss

607. Breanna - 8th Oct 2009 - 6:48 am

Thanks, now it’s working. And sorry for my unhelpful answer.

606. Dave - 7th Oct 2009 - 4:50 pm

Seppo:

Thanks for pointing that out. I have no idea why the file was truncated in the archives the compressed file in the build directory was fine. Anyway I have updated the archives and ensured they contain the full compressed file.

Breanna:

That will be the cause of your problem, I apologise for that.

605. Seppo - 7th Oct 2009 - 4:30 pm

I downloaded v1.2.1 .tar.gz archive and it seems like the cropper.js (compressed version) is missing some code!

It ends like this:
{b=docum
EOF

I downloaded the cropper.js from the demo page and that’s working fine.

P.S. Dave, thanks for the update!

604. Dave - 7th Oct 2009 - 3:46 pm

Breanna,

Please can you try the tests and ensure they are working, then compare with your implementation. This is one of those issues that is pretty much impossible for me to debug blind.

603. Breanna - 7th Oct 2009 - 3:13 pm

Hey Dave,

thanks for answering that fast. In Firebug it seems that they are loaded correctly and in the correct order.

Greetings,
Breanna

602. Dave - 7th Oct 2009 - 2:37 pm

Breanna,

Please make sure that you are including the required JavaScript files (Prototype, script.aculo.us and the cropper.js—in that order) and that they are all loading sucessfully (e.g. not returning 404’s).

-D

601. Breanna - 7th Oct 2009 - 2:35 pm

Hey,

nice work, thanks!
I’m trying it by myself, but it doesn’t work. I copied the code and my site is looking like this:

Display code as plain text
HTML:

  1. Event.observe( window, ‘load’, function() {

  2.     new Cropper.Img(

  3.         ‘testImage’,

  4.         { onEndCrop: onEndCrop }

  5.     );

  6. } );

But I get the error “Cropper ist not defined”. What’s wrong?

Greetings,
Breanna

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