forked from Lulkafe's block: Manually Sortable D3 Barchart
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December 11, 2019 23:28
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Manually Sortable D3 Barchart
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license: mit |
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<!DOCTYPE html> | |
<html lang="en"> | |
<style> | |
.axis { | |
font: 10px sans-serif; | |
} | |
.axis path, | |
.axis line { | |
fill: none; | |
stroke: #000; | |
shape-rendering: crispEdges; | |
} | |
</style> | |
<head> | |
<script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script> | |
<meta charset="UTF-8"> | |
<title>Title</title> | |
</head> | |
<body> | |
<div id="vis"></div> | |
<script> | |
var height = 300, | |
width = 500, | |
padding = { top: 20, left: 20, right: 20, bottom: 20}, | |
xScale = d3.scale.ordinal(), | |
yScale = d3.scale.linear(), | |
svg = d3.select("#vis").append("svg").attr("width", width).attr("height", height), | |
color = d3.scale.category10(), | |
xAxis = d3.svg.axis(), | |
data = [ | |
{ category: "A", value: 50 }, | |
{ category: "B", value: 30 }, | |
{ category: "C", value: 20 }, | |
{ category: "D", value: 20 }, | |
], | |
drag = d3.behavior.drag() | |
.on("dragstart", function(){ | |
var bar = d3.select(this), | |
mouseX = d3.mouse(this)[0], | |
barX = +bar.attr("x"); | |
/* Keep at which x coordinate the bar is drawn when the dragging starts */ | |
bar.property("startX", barX) | |
/* Since x of the bar starts at the top-left corner of the rect, | |
Here, calculate how much the x of the current bar is apart from the x of the mouse */ | |
bar.property("xDiff", mouseX - barX); | |
/* Bring the bar to the front */ | |
bar.node().parentNode.appendChild(bar.node()); | |
}) | |
.on("drag", function(){ | |
var curBar = d3.select(this), | |
curIdx = data.indexOf(curBar.datum()), | |
startX = curBar.property("startX"), | |
mouseX = d3.mouse(this)[0], | |
newX = mouseX - curBar.property("xDiff"), | |
xRange = (xScale.range()[1] - xScale.range()[0]) / 2, | |
backlash = xScale.rangeBand() / 2.5, | |
nearestBar, nearestIdx, nearestX; | |
if (newX < xScale.range()[0] - backlash | |
|| xScale.range()[data.length - 1] + backlash < newX) | |
return; | |
curBar.attr("x", newX); | |
/* Get the index of the nearest bar */ | |
if (curIdx == 0) | |
nearestIdx = 1; | |
else if (newX < startX || curIdx == data.length - 1) | |
nearestIdx = curIdx - 1; | |
else | |
nearestIdx = curIdx + 1; | |
nearestBar = d3.selectAll(".bar").filter(function(d) { return d == data[nearestIdx]; }); | |
nearestX = +nearestBar.attr("x"); | |
/* If the current bar is moved close enough to the nearest bar, | |
then update the order of the data array. For example, if we are dragging | |
the first bar and moving to right, the order will be [a, b, c] to [b, a, c] */ | |
if (startX + xRange < newX || newX < startX - xRange) { | |
var tmp = data[curIdx]; | |
data[curIdx] = data[nearestIdx]; | |
data[nearestIdx] = tmp; | |
curBar.property("startX", nearestX); | |
xScale.domain(data.map(function(d){ return d.category; })); | |
d3.select(".x.axis").transition().duration(200).call(xAxis.scale(xScale)); | |
nearestBar.transition().duration(100).attr("x", xScale(nearestBar.datum().category)); | |
} | |
}) | |
.on("dragend", function(){ | |
var bar = d3.select(this); | |
bar.transition().duration(300).attr("x", xScale(bar.datum().category)); | |
}); | |
xScale.domain(data.map(function(d){ return d.category; })) | |
.rangeRoundBands([ padding.left, width - padding.right], 0.3); | |
yScale.domain([0, d3.max(data, function(d) { return d.value; })]) | |
.range([height - padding.bottom, padding.top]); | |
xAxis.scale(xScale).orient("bottom"); | |
svg.selectAll("rect").data(data).enter() | |
.append("rect").attr("width", xScale.rangeBand()) | |
.attr("height", function(d) { return height - padding.bottom - yScale(d.value)}) | |
.attr("x", function(d) { return xScale(d.category); }) | |
.attr("y", function(d) { return yScale(d.value); }) | |
.attr("fill", function(d,i) { return color(i); }) | |
.attr("class", "bar") | |
.call(drag); | |
svg.append("g") | |
.attr("transform", "translate(" + 0 + "," + (height - padding.bottom) + ")") | |
.attr("class", "x axis") | |
.call(xAxis); | |
</script> | |
</body> | |
</html> |
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