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id	title	challengeType	forumTopicId	dashedName
587d7faa367417b2b2512bd2	Add Labels to D3 Elements	6	301476	add-labels-to-d3-elements

--description--

D3 lets you label a graph element, such as a bar, using the SVG text element.

Like the rect element, a text element needs to have x and y attributes, to place it on the SVG canvas. It also needs to access the data to display those values.

D3 gives you a high level of control over how you label your bars.

--instructions--

The code in the editor already binds the data to each new text element. First, append text nodes to the svg. Next, add attributes for the x and y coordinates. They should be calculated the same way as the rect ones, except the y value for the text should make the label sit 3 units higher than the bar. Finally, use the D3 text() method to set the label equal to the data point value.

Note: For the label to sit higher than the bar, decide if the y value for the text should be 3 greater or 3 less than the y value for the bar.

--hints--

The first text element should have a label of 12 and a y value of 61.

assert($('text').eq(0).text() == '12' && $('text').eq(0).attr('y') == '61');

The second text element should have a label of 31 and a y value of 4.

assert($('text').eq(1).text() == '31' && $('text').eq(1).attr('y') == '4');

The third text element should have a label of 22 and a y value of 31.

assert($('text').eq(2).text() == '22' && $('text').eq(2).attr('y') == '31');

The fourth text element should have a label of 17 and a y value of 46.

assert($('text').eq(3).text() == '17' && $('text').eq(3).attr('y') == '46');

The fifth text element should have a label of 25 and a y value of 22.

assert($('text').eq(4).text() == '25' && $('text').eq(4).attr('y') == '22');

The sixth text element should have a label of 18 and a y value of 43.

assert($('text').eq(5).text() == '18' && $('text').eq(5).attr('y') == '43');

The seventh text element should have a label of 29 and a y value of 10.

assert($('text').eq(6).text() == '29' && $('text').eq(6).attr('y') == '10');

The eighth text element should have a label of 14 and a y value of 55.

assert($('text').eq(7).text() == '14' && $('text').eq(7).attr('y') == '55');

The ninth text element should have a label of 9 and a y value of 70.

assert($('text').eq(8).text() == '9' && $('text').eq(8).attr('y') == '70');

--seed--

--seed-contents--

<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) => 3 * d)
       .attr("fill", "navy");

    svg.selectAll("text")
       .data(dataset)
       .enter()
       // Add your code below this line




       // Add your code above this line
  </script>
<body>

--solutions--

<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) => 3 * d)
       .attr("fill", "navy");

    svg.selectAll("text")
       .data(dataset)
       .enter()
       .append("text")
       .attr("x", (d, i) => i * 30)
       .attr("y", (d, i) => h - (3 * d) - 3)
       .text((d) => d)
  </script>
<body>

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