I'm stuck on integrating gwt with JCrop or imgareaselect javascript libraries I have an image, which url is changing each time the client change the file choosen from its filesystem (using an upload widget). I want the user select the area in its image, this way i will be able to have images with aspect ratio respected respect to the client wishes. Problem is i can't succed in making imgareaselect or jcrop called on load event, each time i have null, if i try jquery ("imagepreview") jquery is unknow at execution time, if i try some $("#imagepreview") i get a $ is undefined...
PLEASE any help... Regards.
public class ThisWidget extends LayoutContainer {
public void onRender(Element parent, int index) {
super.onRender(parent, index);
setLayout(new VBoxLayout());
setWidth("100%");
final FormPanel uploadPhotoPanel = new FormPanel();
uploadPhotoPanel.setWidth("100%");
uploadPhotoPanel.setHeight("150px");
Label label = new Label("Ajouter une photo");
add(label);
uploadPhotoPanel.setAction(GWT.getModuleBaseURL()
+ "photoload/uploadpreview.ctz");
uploadPhotoPanel.setEncoding(FormPanel.ENCODING_MULTIPART);
uploadPhotoPanel.setMethod(FormPanel.METHOD_POST);
final FileUploadField file = new FileUploadField();
file.setName("FILE");
uploadPhotoPanel.add(file);
file.addHandler(new ChangeHandler() {
@Override
public void onChange(ChangeEvent event) {
uploadPhotoPanel.submit();
}
}, ChangeEvent.getType());
final Button btn = new Button("Ajouter",
new SelectionListener<ButtonEvent>() {
@Override
public void componentSelected(ButtonEvent ce) {
uploadPhotoPanel.submit();
}
});
final Image previewimage;
previewimage = new Image();
DOM.setElementAttribute(previewimage.getElement(), "id",
"previewimage");
previewimage.setSize("200px", "200px");
previewimage.addLoadHandler(new LoadHandler(){
protected native void onPreviewLoad() /*-{
document.getElementById("previewimage").imgAreaSelect({
aspectRatio : '1:1',
handles : true,
fadeSpeed : 200
});
}-*/;
@Override
public void onLoad(LoadEvent event) {
onPreviewLoad();
}});
uploadPhotoPanel
.addSubmitCompleteHandler(new SubmitCompleteHandler() {
@Override
public void onSubmitComplete(SubmitCompleteEvent event) {
previewimage.setUrl(GWT.getModuleBaseURL()
+ "photoload/downloadpreview.ctz?tsp="
+ System.currentTimeMillis());
}
});
add(uploadPhotoPanel);
add(previewimage);
add(btn);
}