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Simple gridlines in d3.js (v4+)
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <div id="chart"></div> | |
| <style> | |
| .grid line { | |
| stroke: #ddd; | |
| } | |
| </style> | |
| <script> | |
| // Sample data | |
| var data = [87, 34, 45, 67, 21, 94, 18]; | |
| // Boilerplate | |
| var margin = { top: 50, right: 50, bottom: 50, left: 50 }, | |
| width = 800 - margin.left - margin.right, | |
| height = 300 - margin.top - margin.bottom; | |
| var svg = d3.select("#chart") | |
| .append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| // Scale | |
| var scale = d3.scaleLinear() | |
| .domain( [0, 100] ) | |
| .range( [0, width] ); | |
| // Axis | |
| var axis = d3.axisTop() | |
| .scale(scale); | |
| svg.append("g") | |
| .call(axis); | |
| // Gridline | |
| var gridlines = d3.axisTop() | |
| .tickFormat("") | |
| .tickSize(-height) | |
| .scale(scale); | |
| svg.append("g") | |
| .attr("class", "grid") | |
| .call(gridlines); | |
| // Visual Encodings | |
| svg.selectAll("circles") | |
| .data(data) | |
| .enter() | |
| .append("circle") | |
| .attr("cx", function (d) { return scale(d); }) | |
| .attr("cy", 100) | |
| .attr("r", 5) | |
| .attr("fill", "blue"); | |
| </script> |
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