This is a demonstration of the use of the html 'range' input to rotate two text elements using d3.js v6.
This graph is part of the code samples for the update to the book D3 Tips and Tricks to version 6 of d3.js.
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September 15, 2020 06:09
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Input acting on two elements in v6
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| license: mit |
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| <!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://d3js.org/d3.v6.min.js"></script> | |
| <script> | |
| var width = 600; | |
| var height = 300; | |
| var holder = d3.select("body") | |
| .append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| // draw d3.js text | |
| holder.append("text") | |
| .attr("class", "d3js") | |
| .style("fill", "black") | |
| .style("font-size", "56px") | |
| .attr("dy", ".35em") | |
| .attr("text-anchor", "middle") | |
| .attr("transform", "translate(300,55) rotate(0)") | |
| .text("d3.js"); | |
| // draw d3noob.org text | |
| holder.append("text") | |
| .attr("class", "d3noob") | |
| .style("fill", "black") | |
| .style("font-size", "56px") | |
| .attr("dy", ".35em") | |
| .attr("text-anchor", "middle") | |
| .attr("transform", "translate(300,130) rotate(0)") | |
| .text("d3noob.org"); | |
| // when the input range changes update the rectangle | |
| d3.select("#nAngle").on("input", function() { | |
| update(+this.value); | |
| }); | |
| // Initial starting height of the rectangle | |
| update(0); | |
| // update the elements | |
| function update(nAngle) { | |
| // adjust the range text | |
| d3.select("#nAngle-value").text(nAngle); | |
| d3.select("#nAngle").property("value", nAngle); | |
| // adjust d3.js text | |
| holder.select("text.d3js") | |
| .attr("transform", "translate(300,55) rotate("+nAngle+")"); | |
| // adjust d3noob.org text | |
| holder.select("text.d3noob") | |
| .attr("transform", "translate(300,130) rotate("+(360 - nAngle)+")"); | |
| } | |
| </script> |
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