Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
function OnboardingCalcProgress( data ) {
	var dfd = $.Deferred();
	var checked = 0;
	var onboadItemCheckboxes = this.$element.find( 'input[value^=onboard_item]' );
	var total = onboadItemCheckboxes.length;
	if ( total < 1 ) {
		dfd.resolve( data );
		return dfd.promise();
	}

	var items = this.getItems();
	for( var name in data ) {
		if ( !name.startsWith( 'checkbox_multi-' ) ) {
			continue;
		}
		var checkedCheckboxes = data[name];
		for ( var i = 0; i < checkedCheckboxes.length; i++ ) {
			checked++;	
		}
	}
	data.progress = ( 100 * checked ) / total;
	dfd.resolve( data );

	return dfd.promise();
}