Interactive text rotation with d3.js by d3noob

This is a simple example of implimenting an HTML input using a <range> input tag and using that to adjust a d3.js drawn svg element (rotate text).

It is used as an example and described in the book D3 Tips and Tricks.

index.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>Input test</title>
  
<p>
  <label for="nAngle" 
     style="display: inline-block; width: 240px; text-align: right">
     angle = <span id="nAngle-value">…</span>
  </label>
  <input type="range" min="0" max="360" id="nAngle">
</p>

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script>
<script>

var width = 600;
var height = 300;
 
var holder = d3.select("body")
      .append("svg")
      .attr("width", width)    
      .attr("height", height); 

// draw the text
holder.append("text")
  .style("fill", "black")
  .style("font-size", "56px")
  .attr("dy", ".35em")
  .attr("text-anchor", "middle")
  .attr("transform", "translate(300,150) rotate(0)")
  .text("d3noob.org");

// when the input range changes update the angle 
d3.select("#nAngle").on("input", function() {
  update(+this.value);
});

// Initial starting angle of the text 
update(0);

// update the element
function update(nAngle) {

  // adjust the text on the range slider
  d3.select("#nAngle-value").text(nAngle);
  d3.select("#nAngle").property("value", nAngle);

  // rotate the text
  holder.select("text") 
    .attr("transform", "translate(300,150) rotate("+nAngle+")");
}

</script>