Dual html inputs in v4

This is a demonstration of the use of two html 'range' inputs using d3.js v4.

This graph is part of the code samples for the update to the book D3 Tips and Tricks to version 4 of d3.js.

<!DOCTYPE html>
<meta charset="utf-8">
<title>Double Input Test</title>

<p>
  <label for="nHeight" 
         style="display: inline-block; width: 240px; text-align: right">
         height = <span id="nHeight-value">…</span>
  </label>
  <input type="range" min="1" max="280" id="nHeight">
</p>

<p>
  <label for="nWidth" 
         style="display: inline-block; width: 240px; text-align: right">
         width = <span id="nWidth-value">…</span>
  </label>
  <input type="range" min="1" max="400" id="nWidth">
</p>

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

// draw a rectangle
holder.append("rect")
    .attr("x", 300)
    .attr("y", 150)
    .style("fill", "none")
    .style("stroke", "blue")
    .attr("height", 150) 
    .attr("width", 200);

// read a change in the height input
d3.select("#nHeight").on("input", function() {
  updateHeight(+this.value);
});

// read a change in the width input
d3.select("#nWidth").on("input", function() {
  updateWidth(+this.value);
});

// update the values
updateHeight(150);
updateWidth(100);

// Update the height attributes
function updateHeight(nHeight) {

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

// update the rectangle height
  holder.selectAll("rect") 
    .attr("y", 150-(nHeight/2)) 
    .attr("height", nHeight); 
}

// Update the width attributes
function updateWidth(nWidth) {

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

// update the rectangle width
  holder.selectAll("rect")
    .attr("x", 300-(nWidth/2)) 
    .attr("width", nWidth);
}

</script>

https://d3js.org/d3.v4.min.js