Dual sliders: num, %, rect

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.

forked from d3noob's block: Dual html inputs in v4

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

<p>
  <label for="nHeight" 
         style="display: inline-block; width: 240px; text-align: right; padding-top: 10px">
         $ amount = <span id="nHeight-value">…</span>
  </label>
  <input type="range" min="1" max="100" id="nHeight">
</p>

<p>
  <label for="nWidth" 
         style="display: inline-block; width: 240px; text-align: right; padding-bottom: 20px">
         % of range extent = <span id="nWidth-value">…</span>
  </label>
  <input type="range" min="0" max="100" id="nWidth">
</p>

// viz pixel footprint  
var extent = [0, 100];
  
var height = 60;
var width = 500;
  
var holder = d3.select("body")
      .append("svg")
      .attr("width", width)    
      .attr("height", height);

// draw a rectangle
holder.append("rect")
    .style("fill", "cornflowerblue")
    .style("stroke", "red")
    .attr("height", height) 
    .attr("width", width + height)
    .attr("x", width + height)
    .attr("y", height);

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

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

// update the values
updateHeight(+this.width);
updateWidth(100);

// Update the height attributes
function updateHeight(nHeight) {
	var sum = width + height;
  // 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", 50-(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