UploadCare does not display warning when closing dialog

You are subscribed to openDialog().done()

. This callback will be called when the user selects a file and clicks "done" in the dialog. In this callback, you get the object file

and subscribe to the callback file.fail()

. This callback will be called when a file upload is done due to a network error or poor validators.

If you want to subscribe to the callback when the user closes the dialog without selecting a file (by clicking the × in the upper right corner or pressing ESC), you must subscribe to openDialog().fail()

:

$('#uc_open').on('click', function() {
    // Open the dialog on button cick
    uploadcare.openDialog(null, {
        imagesOnly: true
        }).done(function(file) {
            // User has just clicked "Done" in Uploadcare dialog
            file.done(function(fileInfo) {
                // File uploading succeeded
            });
        }).fail(function(error, fileInfo) {
            // User just has closed the dialog by pressing ESC or clicking on "×"
            alert(error);
        });
    return false;
});