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              <div class="page-header">
		<p>This demo gets the underlying data from a viz to create a collapsible menu. <br>
		Click the menu to set parameters that change the view.</p>
	</div>

	<div id="menuNav">
		<ul><li>Show Top Level</li></ul>
		<div id="menuTree"></div>
	</div>
	<div id="vizContainer"></div>
	<div id="dataSummary"></div>
            
          
!
            
              .page-header{
	font-family:Arial;
	padding-left:25px;
}

#menuNav {
	float:left;
	width: 200px;
	height: 500px;
	overflow-y:auto;
	font-family:Arial;
}

#vizContainer {
	float:left;
	width: 490px;
	height: 500px;
}
		
/***********************   Tree list styling   *******************/
ul {
	list-style-position: inside;
	padding-left: 15px;
	color:#4e79a7;
	font-size:11pt;
}
.collapsed {
	color: #4e79a7;
}
		
li {
	cursor: pointer;
	list-style-type: none;
}
		
li.collapsed::before {
	content: "+ ";
	display: inline-block;
	width: 14px;
}
		
li::before {
	content: "- ";
	display: inline-block;
	width: 14px;
}
		
li:last-child {
	color:#4e79a7;
}
		
li:last-child::before {
	content: "";
}
            
          
!
            
              /*
Code by Robert Rouse, InterWorks, Inc.
Required libraries: JQuery, D3, Tableau JS API 2.1.0 or later
*/

//first, create the viz
$(document).ready(function initViz() {
	var containerDiv = document.getElementById("vizContainer"),
		url = "https://public.tableau.com/views/hierarchy_demo/demo",
		//this url shows how it works with a dashboard. Comment the above and uncomment below to switch.
		//url = "https://public.tableau.com/views/hierarchy_demo/hierarchy_demo",
		options = {
			hideTabs: true,
			hideToolbar: true,
			onFirstInteractive: function () {
				workbook = viz.getWorkbook();
				getVizData();
			}
		};
	viz = new tableau.Viz(containerDiv, url, options);
});

//when viz is loaded (onFirstInteractive), request data
function getVizData() {
	options = {
		maxRows: 0, // Max rows to return. Use 0 to return all rows
		ignoreAliases: false,
		ignoreSelection: true,
		includeAllColumns: false
	};
	
	sheet = viz.getWorkbook().getActiveSheet();
	
	//if active tab is a worksheet, get data from that sheet
	if (sheet.getSheetType() === 'worksheet') {
		sheet.getUnderlyingDataAsync(options).then(function (t) {
			buildMenu(t);
		});
		
	//if active sheet is a dashboard get data from a specified sheet
	} else {
		worksheetArray = viz.getWorkbook().getActiveSheet().getWorksheets();
		for (var i = 0; i < worksheetArray.length; i++) {
			worksheet = worksheetArray[i];
			sheetName = worksheet.getName();
			if (sheetName == 'levels') {
				worksheetArray[i].getSummaryDataAsync(options).then(function (t) {
					buildMenu(t);
				});
			}
		}
	}
}

//restructure the data and build something with it
function buildMenu(table) {
	
	//the data returned from the tableau API
	var columns = table.getColumns();
	var data = table.getData();
	
	//convert to field:values convention
	function reduceToObjects(cols,data) {
		var fieldNameMap = $.map(cols, function(col) { return col.getFieldName(); });
		var dataToReturn = $.map(data, function(d) {
										return d.reduce(function(memo, value, idx) {
											memo[fieldNameMap[idx]] = value.value; return memo;
										}, {});
									});
		return dataToReturn;
	}
	
	var niceData = reduceToObjects(columns, data);
	
	//create nested tree structure
	var menuTree = d3.nest()
		.key(function (d) {return d.Level1;}).sortKeys(d3.ascending)
		.key(function (d) {return d.Level2;}).sortKeys(d3.ascending)
		.key(function (d) {return d.Level3;}).sortKeys(d3.ascending)
		.rollup(function (leaves) {return leaves.length;})
		.entries(niceData);
	
	//D3 layout menu list
	var menu = d3.select('#menuTree').selectAll('ul')
		.data(menuTree)
		.enter()
		.append('ul')
	
	//append list items
	function writeMenu(parentList) {
		
		var item = parentList
			.filter(function(d) { return d.key != "%null%";})
			.append('li')
			.text(function (d) {return d.key;})
			.classed("collapsed", true);
		
		var children = parentList.selectAll('ul')
			.data(function (d) {return d.values})
			.enter().append('ul');
		
		if (!children.empty()) {
			writeMenu(children);
		}
	}
	writeMenu(menu);
	
	//init collapible functions
	$('ul>li').siblings("ul").toggle();
	$('ul').not(':has(li)').remove(); //removes empty children with Null values. not a perfect approach, but easier for this demo
	$('ul>li').click(function () {
		
		//expand if it has children
		if ($(this).siblings('ul').length) {
			$(this).toggleClass("collapsed");
			$(this).siblings("ul").slideToggle(300);
		}
		
		//apply parameter to change the viz
		var depth = $(this).parents("ul").length;
		if ($(this).text()=="Show Top Level") {
			workbook.changeParameterValueAsync("nameInput","");
			workbook.changeParameterValueAsync("levelInput",0);
		} else {
			workbook.changeParameterValueAsync("nameInput",$(this).text());
			workbook.changeParameterValueAsync("levelInput",depth);
		}
	});
}
            
          
!
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