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id	title	challengeType	forumTopicId	dashedName
587d7fa8367417b2b2512bc9	Update the Height of an Element Dynamically	6	301493	update-the-height-of-an-element-dynamically

--description--

The previous challenges covered how to display data from an array and how to add CSS classes. You can combine these lessons to create a simple bar chart. There are two steps to this:

Create a div for each data point in the array
Give each div a dynamic height, using a callback function in the style() method that sets height equal to the data value

Recall the format to set a style using a callback function:

selection.style("cssProperty", (d) => d)

--instructions--

Add the style() method to the code in the editor to set the height property for each element. Use a callback function to return the value of the data point with the string px added to it.

--hints--

The first div should have a height of 12 pixels.

assert($('div').eq(0)[0].style.height === '12px');

The second div should have a height of 31 pixels.

assert($('div').eq(1)[0].style.height === '31px');

The third div should have a height of 22 pixels.

assert($('div').eq(2)[0].style.height === '22px');

The fourth div should have a height of 17 pixels.

assert($('div').eq(3)[0].style.height === '17px');

The fifth div should have a height of 25 pixels.

assert($('div').eq(4)[0].style.height === '25px');

The sixth div should have a height of 18 pixels.

assert($('div').eq(5)[0].style.height === '18px');

The seventh div should have a height of 29 pixels.

assert($('div').eq(6)[0].style.height === '29px');

The eighth div should have a height of 14 pixels.

assert($('div').eq(7)[0].style.height === '14px');

The ninth div should have a height of 9 pixels.

assert($('div').eq(8)[0].style.height === '9px');

--seed--

--seed-contents--

<style>
  .bar {
    width: 25px;
    height: 100px;
    display: inline-block;
    background-color: blue;
  }
</style>
<body>
  <script>
    const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];

    d3.select("body").selectAll("div")
      .data(dataset)
      .enter()
      .append("div")
      .attr("class", "bar")
      // Add your code below this line



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

--solutions--

<style>
  .bar {
    width: 25px;
    height: 100px;
    display: inline-block;
    background-color: blue;
  }
</style>
<body>
  <script>
    const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];

    d3.select("body").selectAll("div")
      .data(dataset)
      .enter()
      .append("div")
      .attr("class", "bar")
      .style('height', d => `${d}px`)
  </script>
</body>

2.8 KiB Raw Blame History