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module DropzoneHelper
# Provides a way to perform `attach_file` for a Dropzone-based file input
#
# This is accomplished by creating a standard HTML file input on the page,
# performing `attach_file` on that field, and then triggering the appropriate
# Dropzone events to perform the actual upload.
#
# This method waits for the upload to complete before returning.
# max_file_size is an optional parameter.
# If it's not 0, then it used in dropzone.maxFilesize parameter.
# wait_for_queuecomplete is an optional parameter.
# If it's 'false', then the helper will NOT wait for backend response
# It lets to test behaviors while AJAX is processing.
def dropzone_file(files, max_file_size = 0, wait_for_queuecomplete = true)
# Generate a fake file input that Capybara can attach to
page.execute_script <<-JS.strip_heredoc
$('#fakeFileInput').remove();
var fakeFileInput = window.$('<input/>').attr(
{id: 'fakeFileInput', type: 'file', multiple: true}
).appendTo('body');
window._dropzoneComplete = false;
JS
# Attach files to the fake input selector with Capybara
attach_file('fakeFileInput', files)
# Manually trigger a Dropzone "drop" event with the fake input's file list
page.execute_script <<-JS.strip_heredoc
var dropzone = $('.div-dropzone')[0].dropzone;
dropzone.options.autoProcessQueue = false;
if (#{max_file_size} > 0) {
dropzone.options.maxFilesize = #{max_file_size};
}
dropzone.on('queuecomplete', function() {
window._dropzoneComplete = true;
});
var fileList = [$('#fakeFileInput')[0].files];
$.map(fileList, function(file){
var e = jQuery.Event('drop', { dataTransfer : { files : file } });
dropzone.listeners[0].events.drop(e);
});
dropzone.processQueue();
JS
if wait_for_queuecomplete
# Wait until Dropzone's fired `queuecomplete`
loop until page.evaluate_script('window._dropzoneComplete === true')
end
end
end
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