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barchart_enter_exit
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| license: mit |
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| Food | Deliciousness | |
|---|---|---|
| Apples | 9 | |
| Green Beans | 5 | |
| Egg Salad Sandwich | 4 | |
| Cookies | 10 | |
| Liver | 2 | |
| Burrito | 7 |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <meta charset="utf-8"> | |
| <title>D3: Loading data from a CSV file</title> | |
| </head> | |
| <body> | |
| <p>Click on this text to update the chart with new data values (once).</p> | |
| <script type="text/javascript"> | |
| var margin = { | |
| top: 20, | |
| right: 20, | |
| bottom: 30, | |
| left: 40 | |
| }, | |
| w = 600 - margin.left - margin.right, | |
| h = 300 - margin.top - margin.bottom; | |
| var padding = 40; | |
| var data = [{ | |
| "Food": "Apples", | |
| "Deliciousness": 9, | |
| "new": 4 | |
| }, { | |
| "Food": "Green Beans", | |
| "Deliciousness": 5, | |
| "new": 4 | |
| }, { | |
| "Food": "Egg Salad Sandwich", | |
| "Deliciousness": 4, | |
| "new": 4 | |
| }, { | |
| "Food": "Cookies", | |
| "Deliciousness": 10, | |
| "new": 4 | |
| }, { | |
| "Food": "Liver", | |
| "Deliciousness": 2, | |
| "new": 4 | |
| }, ]; | |
| data.forEach(function(d) { | |
| d.Deliciousness = +d.Deliciousness; | |
| }); | |
| //define key | |
| var key = function(d) { | |
| return d.Food; | |
| } | |
| var svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", w + margin.left + margin.right + padding) | |
| .attr("height", h + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + | |
| margin.top + ")"); | |
| //initial state | |
| //scale and axis | |
| var xScale = d3.scaleBand() | |
| .domain(d => d.Food) | |
| .range([0, w]) | |
| .paddingInner(0.2); | |
| xScale.domain(data.map(function(d) { | |
| return d.Food; | |
| })); | |
| var yScale = d3.scaleLinear() | |
| .domain([0, d3.max(data, d => d.Deliciousness)]) | |
| .rangeRound([h, 0]); | |
| var xAxis = d3.axisBottom() | |
| .scale(xScale) | |
| .ticks(5); | |
| var yAxis = d3.axisLeft() | |
| .scale(yScale) | |
| .ticks(5); | |
| //draw rect | |
| svg.selectAll('rect') | |
| .data(data, key) | |
| .enter() | |
| .append('rect') | |
| .attr('x', (d, i) => margin.left + i * ((w + 20) / data.length)) | |
| .attr('y', d => yScale(d.Deliciousness)) | |
| .attr('width', xScale.bandwidth()) | |
| .attr('height', d => h - yScale(d.Deliciousness)) | |
| .attr('fill', function(d) { | |
| if (d === 30) return "red"; | |
| return "rgb(0,0," + d.Deliciousness * 10 + ")"; | |
| }); | |
| //text label | |
| svg.selectAll("text") | |
| .data(data) | |
| .enter() | |
| .append("text") | |
| .text(d => d.Deliciousness) | |
| .attr('x', (d, i) => margin.left + i * ((w + 20) / data.length) + 0.4 * w / data.length) | |
| .attr("y", d => yScale(d.Deliciousness) + 15) | |
| .attr("fill", "white") | |
| .attr("text-anchor", "middle"); | |
| //draw axis | |
| svg.append("g") | |
| .attr("class", "axis") | |
| .attr("transform", "translate(" + padding + ",0)") | |
| .call(yAxis); | |
| svg.append("g") | |
| .attr("class", "xaxis") | |
| .attr("transform", "translate(" + margin.left + "," + h + ")") | |
| .call(xAxis); | |
| //transition | |
| d3.select("p") | |
| .on("click", function() { | |
| //New values for dataset | |
| data = [{ | |
| "Food": "Green Beans", | |
| "Deliciousness": 5, | |
| "new": 4 | |
| }, { | |
| "Food": "Egg Salad Sandwich", | |
| "Deliciousness": 4, | |
| "new": 4 | |
| }, { | |
| "Food": "Cookies", | |
| "Deliciousness": 10, | |
| "new": 4 | |
| }, { | |
| "Food": "Liver", | |
| "Deliciousness": 2, | |
| "new": 4 | |
| }, { | |
| "Food": "Burrito", | |
| "Deliciousness": 7, | |
| "new": 4 | |
| }]; | |
| xScale.domain(data.map(function(d) { | |
| return d.Food; | |
| })); | |
| svg.select('.xaxis') | |
| .call(xAxis); | |
| //Update all rects | |
| var bars = svg.selectAll("rect") | |
| .data(data, key); | |
| bars.exit().remove(); | |
| bars.enter() | |
| .append("rect") | |
| // <-- This makes it a smooth transition! | |
| .attr("x", w) | |
| .attr('y', d => yScale(d.Deliciousness)) | |
| .attr("width", xScale.bandwidth()) | |
| .attr('height', d => h - yScale(d.Deliciousness)) | |
| .merge(bars) //Merges the enter selection with the update selection | |
| .transition() //Initiate a transition on all elements in the update selection (all rects) | |
| .duration(500) | |
| .attr('x', (d, i) => margin.left + i * ((w + 20) / data.length)) | |
| .attr('y', d => yScale(d.Deliciousness)) | |
| .attr('width', xScale.bandwidth()) | |
| .attr('height', d => h - yScale(d.Deliciousness)); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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