freeCodeCamp/update-the-height-of-an-element-dynamically.english.md at 8cca63945016623d2b1f34fee49635f691bdfa3a

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lasjorg 8cca639450 fix(challenge): check inline styles on elements, add solution (#37756 )

2019-12-16 16:18:29 +01:00

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id, title, challengeType, forumTopicId

id	title	challengeType	forumTopicId
587d7fa8367417b2b2512bc9	Update the Height of an Element Dynamically	6	301493

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: 1) Create a div for each data point in the array 2) 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.

Tests

tests:
  - text: The first <code>div</code> should have a <code>height</code> of 12 pixels.
    testString: assert($('div').eq(0)[0].style.height === '12px');
  - text: The second <code>div</code> should have a <code>height</code> of 31 pixels.
    testString: assert($('div').eq(1)[0].style.height === '31px');
  - text: The third <code>div</code> should have a <code>height</code> of 22 pixels.
    testString: assert($('div').eq(2)[0].style.height === '22px');
  - text: The fourth <code>div</code> should have a <code>height</code> of 17 pixels.
    testString: assert($('div').eq(3)[0].style.height === '17px');
  - text: The fifth <code>div</code> should have a <code>height</code> of 25 pixels.
    testString: assert($('div').eq(4)[0].style.height === '25px');
  - text: The sixth <code>div</code> should have a <code>height</code> of 18 pixels.
    testString: assert($('div').eq(5)[0].style.height === '18px');
  - text: The seventh <code>div</code> should have a <code>height</code> of 29 pixels.
    testString: assert($('div').eq(6)[0].style.height === '29px');
  - text: The eighth <code>div</code> should have a <code>height</code> of 14 pixels.
    testString: assert($('div').eq(7)[0].style.height === '14px');
  - text: The ninth <code>div</code> should have a <code>height</code> of 9 pixels.
    testString: assert($('div').eq(8)[0].style.height === '9px');

Challenge Seed

<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>

Solution

<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>

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