3.5 KiB
		
	
	
	
	
	
	
	
			
		
		
	
	id, title, challengeType, forumTopicId, dashedName
| id | title | challengeType | forumTopicId | dashedName | 
|---|---|---|---|---|
| 587d7faa367417b2b2512bd6 | Add a Tooltip to a D3 Element | 6 | 301470 | add-a-tooltip-to-a-d3-element | 
--description--
A tooltip shows more information about an item on a page when the user hovers over that item. There are several ways to add a tooltip to a visualization, this challenge uses the SVG title element.
title pairs with the text() method to dynamically add data to the bars.
--instructions--
Append a title element under each rect node. Then call the text() method with a callback function so the text displays the data value.
--hints--
Your code should have 9 title elements.
assert($('title').length == 9);
The first title element should have tooltip text of 12.
assert($('title').eq(0).text() == '12');
The second title element should have tooltip text of 31.
assert($('title').eq(1).text() == '31');
The third title element should have tooltip text of 22.
assert($('title').eq(2).text() == '22');
The fourth title element should have tooltip text of 17.
assert($('title').eq(3).text() == '17');
The fifth title element should have tooltip text of 25.
assert($('title').eq(4).text() == '25');
The sixth title element should have tooltip text of 18.
assert($('title').eq(5).text() == '18');
The seventh title element should have tooltip text of 29.
assert($('title').eq(6).text() == '29');
The eighth title element should have tooltip text of 14.
assert($('title').eq(7).text() == '14');
The ninth title element should have tooltip text of 9.
assert($('title').eq(8).text() == '9');
--seed--
--seed-contents--
<style>
  .bar:hover {
    fill: brown;
  }
</style>
<body>
  <script>
    const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
    const w = 500;
    const h = 100;
    const svg = d3.select("body")
                  .append("svg")
                  .attr("width", w)
                  .attr("height", h);
    svg.selectAll("rect")
       .data(dataset)
       .enter()
       .append("rect")
       .attr("x", (d, i) => i * 30)
       .attr("y", (d, i) => h - 3 * d)
       .attr("width", 25)
       .attr("height", (d, i) => d * 3)
       .attr("fill", "navy")
       .attr("class", "bar")
       // Add your code below this line
       // Add your code above this line
    svg.selectAll("text")
       .data(dataset)
       .enter()
       .append("text")
       .text((d) => d)
       .attr("x", (d, i) => i * 30)
       .attr("y", (d, i) => h - (d * 3 + 3))
  </script>
</body>
--solutions--
<style>
  .bar:hover {
    fill: brown;
  }
</style>
<body>
  <script>
    const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
    const w = 500;
    const h = 100;
    const svg = d3.select("body")
                  .append("svg")
                  .attr("width", w)
                  .attr("height", h);
    svg.selectAll("rect")
       .data(dataset)
       .enter()
       .append("rect")
       .attr("x", (d, i) => i * 30)
       .attr("y", (d, i) => h - 3 * d)
       .attr("width", 25)
       .attr("height", (d, i) => d * 3)
       .attr("fill", "navy")
       .attr("class", "bar")
       .append("title")
       .text((d) => d)
    svg.selectAll("text")
       .data(dataset)
       .enter()
       .append("text")
       .text((d) => d)
       .attr("x", (d, i) => i * 30)
       .attr("y", (d, i) => h - (d * 3 + 3))
  </script>
</body>