This is an example of implimenting multiple HTML inputs using <range> input tags and using them to adjust a d3.js drawn svg element (a rectangle).
It is used as an example and described in the book D3 Tips and Tricks.
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May 25, 2020 23:00
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Multiple HTML inputs linked with d3.js
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| license: mit |
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| <!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> | |
| <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 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> |
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