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@d3noob
Last active December 3, 2016 02:27
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Input acting on two elements in v4

This is a demonstration of the use of the html 'range' input to rotate two text elements 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>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.v4.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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