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about-d3.js
/
style-function.html

<!DOCTYPE html>
<html>
<head>
  <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
  <title>style</title>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/7.6.1/d3.min.js"></script>
  <script>

    function main() {

      d3.selectAll('div').style('background-color', function(data, index) {

         document.getElementById('out').innerHTML += 'index: ' + index + "<br>";

         return '#' + Math.floor(Math.random() * 256).toString(16) +
                      Math.floor(Math.random() * 256).toString(16) +
                      Math.floor(Math.random() * 256).toString(16);

       })
    }

  </script>
</head>
<body onload='main();'>

  Use <code>selectAll(...).style(..., function())</code> to change the style of selected elements.

  <div>div 1</div>
  <div>div 2</div>
  <div>div 3</div>
  <div>div 4</div>
  <div>div 5</div>
  <div>div 6</div>
  <div>div 7</div>
  <div>div 8</div>
  <div>div 9</div>

  <p>Compare with <a href='selectAll-data-style.html'>selectAll-data-style.html</a>

  <h1>Out</h1>
  <p id='out'></p>

</body>
</html>