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slider.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>D3: Filtering selections based on slider input values</title>
<script src="https://d3js.org/d3.v4.min.js"></script>
<style type="text/css">
p {
display: inline-block;
}
input {
height: 250px;
width: 30px;
/* Orient vertically */
-webkit-appearance: slider-vertical;
writing-mode: bt-lr;
}
.line.safeLevel{
stroke: magenta;
stroke-width: 4px;
stroke-dasharray: 8;
}
</style>
</head>
<body>
<div style="margin-bottom:20px; color:steelblue;"> Move the slider to set the threshold</div>
<p>
<input id="slider" type="range" min="0" max="25" step="1" value="0" orient="vertical">
</p>
<script type="text/javascript">
//Width and height
var w = 600;
var h = 250;
var dataset = [ { key: 0, value: 5 }, //dataset is now an array of objects.
{ key: 1, value: 10 }, //Each object has a 'key' and a 'value'.
{ key: 2, value: 13 },
{ key: 3, value: 19 },
{ key: 4, value: 21 },
{ key: 5, value: 25 },
{ key: 6, value: 22 },
{ key: 7, value: 18 },
{ key: 8, value: 15 },
{ key: 9, value: 13 },
{ key: 10, value: 11 },
{ key: 11, value: 12 },
{ key: 12, value: 15 },
{ key: 13, value: 20 },
{ key: 14, value: 18 },
{ key: 15, value: 17 },
{ key: 16, value: 16 },
{ key: 17, value: 18 },
{ key: 18, value: 23 },
{ key: 19, value: 25 } ];
var xScale = d3.scaleBand()
.domain(d3.range(dataset.length))
.rangeRound([0, w])
.paddingInner(0.05);
var yScale = d3.scaleLinear()
.domain([0, d3.max(dataset, function(d) { return d.value; })])
.range([0, h]);
//Define key function, to be used when binding data
var key = function(d) {
return d.key;
};
//Create SVG element
var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
//Create bars
svg.selectAll("rect")
.data(dataset, key)
.enter()
.append("rect")
.attr("x", function(d, i) {
return xScale(i);
})
.attr("y", function(d) {
return h - yScale(d.value);
})
.attr("width", xScale.bandwidth())
.attr("height", function(d) {
return yScale(d.value);
})
.attr("fill", function(d) {
return "rgb(0, 0, " + (d.value * 10) + ")";
});
//Create labels
svg.selectAll("text")
.data(dataset, key)
.enter()
.append("text")
.text(function(d) {
return d.value;
})
.attr("text-anchor", "middle")
.attr("x", function(d, i) {
return xScale(i) + xScale.bandwidth() / 2;
})
.attr("y", function(d) {
return h - yScale(d.value) + 14;
})
.attr("font-family", "sans-serif")
.attr("font-size", "11px")
.attr("fill", "white");
//On change, update styling
d3.select("input")
.on("change", function() {
d3.select("svg").select("line").remove()
var threshold = +d3.select(this).node().value;
svg.selectAll("rect")
.attr("fill", function(d) {
return "rgb(0, 0, " + (d.value * 10) + ")";
})
.filter(function(d) {
return d.value <= threshold;
})
.attr("fill", "red");
svg.append("line")
.attr("class", "line safeLevel")
.attr("x1", 0)
.attr("y1", h - yScale(threshold))
.attr("x2", w)
.attr("y2", h - yScale(threshold));
});
</script>
</body>
</html>