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JackHowa/d3-notes.txt

Created June 24, 2018 23:37
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this is notes about the d3 portion of the fcc code camp
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d3-notes.txt
d3 on fcc won't let be me
@JackHowa
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https://learn.freecodecamp.org/data-visualization/data-visualization-with-d3/style-d3-labels

  • even text has a fill color property


screen shot 2018-06-25 at 22 28 53

<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) => d * 3)
       .attr("fill", "navy");
    
    svg.selectAll("text")
       .data(dataset)
       .enter()
       .append("text")
       .text((d) => d)
       .attr("x", (d, i) => i * 30)
       .attr("y", (d, i) => h - (3 * d) - 3)
       .style('font-size', '25px')
       .style('fill', 'red')
  </script>
</body>

@JackHowa
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JackHowa commented Jun 26, 2018 •
edited
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https://learn.freecodecamp.org/data-visualization/data-visualization-with-d3/add-a-hover-effect-to-a-d3-element

  • add a class via attr

screen shot 2018-06-25 at 22 32 48

<style>
  .bar:hover {
    fill: brown;
  }
</style>
<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")
       .attr('class', 'bar')
           
    svg.selectAll("text")
       .data(dataset)
       .enter()
       .append("text")
       .text((d) => d)
       .attr("x", (d, i) => i * 30)
       .attr("y", (d, i) => h - (3 * d) - 3);
       
  </script>
</body>

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