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--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>