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Using {{org.vaadin.jcrop.Jcrop.addListener(JcropSelectionChanged)}} with java 8 lambda is not possible because the method is ambiguous for the type Jcrop.

How to get the selected crop image and Store in the local directory ?

Since Vaadin 8 Version you can only crop one time.
You can see it in your own example with Chrome: https://vaadin-jcrop-demo.rocketbase.io/
In an earlier version of the addon after you draw a rectangle you can still change the size and the position. This isn't possible anymore. It seems that toggle gets disabled somehow. This should not be the default case.

The setSelection method only seems to work when the component is already visible. There is the following comment in the setSelection source code:
"set the selection of Jcrop programmatically
is only working when the component is already attached to the screen"

My use case is that a user can select and area of an image and the selection coordinates are saved to a database. At a later stage the user should be able to come back and modify the selection and I can't seem to find a way to load the jcrop area with a selection already applied to it.

Is there a way to initialize jcrop with a certain selection that is immediately shown when the component is first loaded? Or is there some kind of workaround to achieve this?

This would be a very useful feature for me.

Thanks for providing the awesome add-on.

Hi there! I'm trying to make a basic cropping feature for a profile picture in our application using the vaadin-jcrop add on.

The problem is that, after uploading a new image and setting it as the source to jcrop (using the FileResource class) any selection causes a NumberFormatException as the json interpreter of vaadin tries to convert a float to an int (I copy the relevant part of the stack trace).

SEVERE: java.lang.NumberFormatException: For input string: "1375.368888888889" at java.lang.NumberFormatException.forInputString(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at java.lang.Integer.valueOf(Unknown Source) at com.vaadin.server.JsonCodec.decodeInternalType(JsonCodec.java:414) at com.vaadin.server.JsonCodec.decodeInternalOrCustomType(JsonCodec.java:272) at com.vaadin.server.communication.ServerRpcHandler.parseServerRpcInvocation(ServerRpcHandler.java:476) at com.vaadin.server.communication.ServerRpcHandler.parseInvocation(ServerRpcHandler.java:409) at com.vaadin.server.communication.ServerRpcHandler.parseInvocations(ServerRpcHandler.java:352) at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:218) at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:180) at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:93) at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41) at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1406) at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:305) at at.workflow.webdesk.tools.webclient.GlobalContextAwareServlet.service(GlobalContextAwareServlet.java:60) at javax.servlet.http.HttpServlet.service(HttpServlet.java:848) ...

The active selection is not always preserved when setImageUrl() or setResource() is called. I can reproduce the issue with the sampler:

1. Make a random selection
2. Click "switchImage" or "setResource"

Result:

• When the image is already cached, switchImage works for me,
• setResource seems to loose the selection every time.

The information about the selection above the image however shows the correct values. Only the overlay is lost.

It seems as if the problem is related to the image loading speed. If the the image is served slowly, the selection overlay is lost.