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freeCodeCamp/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/update-the-height-of-an-element-dynamically.english.md

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id, title, required, challengeType
id title required challengeType
587d7fa8367417b2b2512bc9 Update the Height of an Element Dynamically
src
https://cdnjs.cloudflare.com/ajax/libs/d3/4.3.0/d3.min.js
6

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

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

// solution required