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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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