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Histogram Demo
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| license: mit |
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| body { | |
| margin: 0; | |
| padding: 0; | |
| background-color: #ccc; | |
| padding: 5em; | |
| } | |
| #work__area { | |
| width: 100%; | |
| background-color: #efefef; | |
| border-radius: 5px; | |
| } | |
| #chart-area { | |
| height: 450px; | |
| padding: 20px 50px; | |
| } | |
| #header__title { | |
| text-align: center; | |
| } | |
| svg { | |
| width: 100%; | |
| height: 100%; | |
| } | |
| .rect__hist:hover { | |
| cursor: pointer; | |
| fill: #ffa600; | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>D3.js Frontend Masters - Intro Histogram</title> | |
| <link rel="stylesheet" href="index.css"> | |
| </head> | |
| <body> | |
| <section id="work__area"> | |
| <h3 id="header__title">D3 Histogram Demo</h3> | |
| <div id='chart-area'> | |
| <svg> | |
| </svg> | |
| </div> | |
| </section> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="index.js" charset="utf-8"></script> | |
| </body> | |
| </html> |
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| const chartData = [120, 400, 250, 205, 80, 230]; | |
| const rectWidth = 50; | |
| const height = 400; | |
| const svg = d3.select("svg"); | |
| var enter = svg | |
| .selectAll("rect") | |
| .data(chartData) | |
| .enter() | |
| .append("rect") | |
| .attr("transform", "translate(50, 0)") | |
| .attr("x", (d, i) => i * rectWidth) | |
| .attr("y", d => height - d) | |
| .attr("width", rectWidth) | |
| .attr("height", d => d) | |
| .attr("fill", "teal") | |
| .attr("stroke", "#fff") | |
| .attr("class", "rect__hist"); | |
| //append yAxis | |
| // // // // // | |
| const yScale = d3 | |
| .scaleLinear() | |
| .domain(d3.extent(chartData)) | |
| .range([height, 0]); | |
| const yAxis = d3.axisLeft().scale(yScale); | |
| yAxis.ticks(10, ",.0f"); | |
| // yAxis.tickFormat(d3.format(",.0f")); | |
| const axis = d3 | |
| .select("svg") | |
| .append("g") | |
| .attr("transform", "translate(30, 0)") | |
| // .attr("stroke", "red") | |
| .call(yAxis); | |
| const axisText = axis | |
| .selectAll("text") | |
| .attr("fill", d => (d > 200 ? "red" : "green")); | |
| console.log("yAxis===> ", axis.node()); | |
| // console.log("extent===>>", d3.extent(enter.data())); |
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