100% stacked column chart with D3
100% stacked column charts are similar to stacked column charts in that categories are represented as vertical bars and series as components of those bars. However, in a 100% stacked column chart, each series bar represents the percentage of the whole to which it belongs, where the total (cumulative) of each stacked bar always equals 100%.
More about: 100% stacked column chart
100% stacked column chart
<!DOCTYPE html>
<meta charset="utf-8">
<!-- Include d3 library -->
<script src="https://d3js.org/d3.v7.min.js"></script>
<!-- Create a container to host the chart -->
<div id="viz_container"></div>
// set the dimensions and margins of the graph
const margin = {top: 80, right: 20, bottom: 50, left: 40};
const width = 450 - margin.left - margin.right;
const height = 350 - margin.top - margin.bottom;
// append the svg object to the body of the page
const svg = d3.select("#viz_container")
.append("svg")
.attr("width", "100%")
.attr("height", "100%")
.attr("viewBox", "0 0 450 350")
.attr("preserveAspectRatio", "xMinYMin")
.append("g")
.attr("transform", `translate(${margin.left}, ${margin.top})`);
// parse the Data
d3.csv("https://raw.githubusercontent.com/GDS-ODSSS/unhcr-dataviz-platform/master/data/part_to_a_whole/column_stacked_100perc_d3.csv")
.then(function(data){
// list of value keys
const typeKeys = data.columns.slice(1);
// stack the data
const stack = d3.stack()
.keys(typeKeys)
.order(d3.stackOrderNone)
.offset(d3.stackOffsetNone)
const stackedData =stack(data)
// X scale and Axis
const xScale = d3.scaleBand()
.domain(data.map(d => d.Year))
.range([0, width])
.padding(.2);
svg
.append('g')
.attr("transform", `translate(0, ${height})`)
.call(d3.axisBottom(xScale).tickSize(0).tickPadding(8));
// Y scale and Axis
const yScale = d3.scaleLinear()
.domain([0, 1])
.range([height, 0]);
svg
.append('g')
.call(d3.axisLeft(yScale).ticks(10, "%").tickSize(0).tickPadding(4))
.call(d => d.select(".domain").remove());
// color palette
const color = d3.scaleOrdinal()
.domain(typeKeys)
.range(["#18375F", "#0072BC", "#8EBEFF", "#00B398"])
// set horizontal grid line
const GridLine = function() {return d3.axisLeft().scale(yScale)};
svg
.append("g")
.attr("class", "grid")
.call(GridLine()
.tickSize(-width,0,0)
.tickFormat("")
);
// create a tooltip
const tooltip = d3.select("body")
.append("div")
.attr("class", "tooltip");
// tooltip events
const mouseover = function(d) {
tooltip
.style("opacity", 1)
d3.select(this)
.style("stroke", "#EF4A60")
.style("opacity", .5)
};
const mousemove = function(event,d) {
const subgroupName = d3.select(this.parentNode).datum().key;
const subgroupValue = d.data[subgroupName];
const f = d3.format(".0f");
tooltip
.html(`<b>${subgroupName}</b>: ${f(subgroupValue*100)}%`)
.style("top", event.pageY - 10 + "px")
.style("left", event.pageX + 10 + "px")
};
const mouseleave = function(d) {
tooltip
.style("opacity", 0)
d3.select(this)
.style("stroke", "none")
.style("opacity", 1)
};
// create bars
svg.append("g")
.selectAll("g")
.data(stackedData)
.join("g")
.attr("fill", d => color(d.key))
.selectAll("rect")
.data(d => d)
.join("rect")
.attr("x", d => xScale(d.data.Year))
.attr("y", d => yScale(d[1]))
.attr("width", xScale.bandwidth())
.attr("height", d => yScale(d[0]) - yScale(d[1]))
.on("mouseover", mouseover)
.on("mousemove", mousemove)
.on("mouseleave", mouseleave)
// set title
svg
.append("text")
.attr("class", "chart-title")
.attr("x", -(margin.left)*0.7)
.attr("y", -(margin.top)/1.5)
.attr("text-anchor", "start")
.text("Levels of earmarking | 2012-2020")
// set source
svg
.append("text")
.attr("class", "chart-source")
.attr("x", -(margin.left)*0.7)
.attr("y", height + margin.bottom*0.7)
.attr("text-anchor", "start")
.text("Source: UNHCR")
// set copyright
svg
.append("text")
.attr("class", "copyright")
.attr("x", -(margin.left)*0.7)
.attr("y", height + margin.bottom*0.9)
.attr("text-anchor", "start")
.text("©UNHCR, The UN Refugee Agency")
//set legend
svg
.append("rect")
.attr("x", -(margin.left)*0.7)
.attr("y", -(margin.top/2.5))
.attr("width", 13)
.attr("height", 13)
.style("fill", "#18375F")
svg
.append("text")
.attr("class", "legend")
.attr("x", -(margin.left)*0.6+15)
.attr("y", -(margin.top/3.5))
.text("Earmarked")
svg
.append("rect")
.attr("x", 60)
.attr("y", -(margin.top/2.5))
.attr("width", 13)
.attr("height", 13)
.style("fill", "#0072BC")
svg
.append("text")
.attr("class", "legend")
.attr("x", 80)
.attr("y", -(margin.top/3.5))
.text("Softly earmarked")
svg
.append("rect")
.attr("x", 170)
.attr("y", -(margin.top/2.5))
.attr("width", 13)
.attr("height", 13)
.style("fill", "#8EBEFF")
svg
.append("text")
.attr("class", "legend")
.attr("x", 190)
.attr("y", -(margin.top/3.5))
.text("Tightly earmarked")
svg
.append("rect")
.attr("x", 290)
.attr("y", -(margin.top/2.5))
.attr("width", 13)
.attr("height", 13)
.style("fill", "#00B398")
svg
.append("text")
.attr("class", "legend")
.attr("x", 310)
.attr("y", -(margin.top/3.5))
.text("Unearmarked")
})
