silverstripe-subsites/javascript/SubsitesTreeDropdownField.js

(function($) {
	$.entwine('ss', function($) {
		$('.TreeDropdownField').entwine({
			subsiteID: function() {
				var subsiteSel = $('#CopyContentFromID_SubsiteID select')[0];
				if(!subsiteSel) return;
				
				subsiteSel.onchange = (function() {
					this.createTreeNode(true);
					this.ajaxGetTree((function(response) {
						this.newTreeReady(response, true);
						this.updateTreeLabel();
					}).bind(this));
				}).bind(this);
				return subsiteSel.options[subsiteSel.selectedIndex].value;
			},
	
			getRequestParams: function() {
				var name = this.find(':input:hidden').attr('name'), obj = {};
				obj[name + '_SubsiteID'] = parseInt(this.subsiteID());
				return obj;
			}
		});
	});
})(jQuery);