freeCodeCamp Challenge Guide: Add Inline Styling to Elements

Add Inline Styling to Elements


Problem Explanation

This challenge introduces the D3 style method, which takes 2 arguments: (key, value).

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Hints

Hint 1

  • Make sure both of your arguments are in quotations, single or double quotes will work

Hint 2

  • In the example, selection.style refers to an arbitrary selected element, chain your style method to the existing method chain

Solutions

Solution 1 (Click to Show/Hide)
<body>
  <script>
    const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
    
    d3.select("body").selectAll("h2")
      .data(dataset)
      .enter()
      .append("h2")
      .text((d) => (d + " USD"))
      
      .style('font-family', 'verdana')
      
  </script>
</body>    

Code Explanation

  • the style method takes 2 arguments, the first is the key and the second the value
  • key in the style method is the property name that you would use in a CSS declaration
  • value is used just as a value would be used in a CSS declaration
  • Since we are in JavaScript and style is a method we are calling, quotes must be used for the arguments. Otherwise, the function would try to use the value of the variables font-family and verdana, which do not exist and would each throw a ReferenceError

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