How to plot after data load from csv in d3.js?

by ryan.murray , in category: Javascript , a month ago

How to plot after data load from csv in d3.js?

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1 answer

by jasen_gottlieb , a month ago

@ryan.murray 

To plot data loaded from a CSV file using D3.js, you can follow these steps:

  1. Load the data from the CSV file: d3.csv("data.csv", function(data) { // data processing and plotting code });
  2. Define the dimensions of the SVG canvas and margins: var margin = { top: 20, right: 30, bottom: 30, left: 40 }; var width = 600 - margin.left - margin.right; var height = 400 - margin.top - margin.bottom; var svg = d3 .select("body") .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 + ")");
  3. Convert the data to numeric values if needed: data.forEach(function(d) { d.xValue = +d.xValue; d.yValue = +d.yValue; });
  4. Define scales for x and y axes: var xScale = d3 .scaleLinear() .domain([0, d3.max(data, function(d) { return d.xValue; })]) .range([0, width]); var yScale = d3 .scaleLinear() .domain([0, d3.max(data, function(d) { return d.yValue; })]) .range([height, 0]);
  5. Create x and y axes: var xAxis = d3.axisBottom().scale(xScale); var yAxis = d3.axisLeft().scale(yScale); svg.append("g") .attr("transform", "translate(0," + height + ")") .call(xAxis); svg.append("g") .call(yAxis);
  6. Plot the data points: svg.selectAll("circle") .data(data) .enter() .append("circle") .attr("cx", function(d) { return xScale(d.xValue); }) .attr("cy", function(d) { return yScale(d.yValue); }) .attr("r", 5) .attr("fill", "steelblue");


This is a basic example to get you started. You can customize the appearance and behavior of the plot further based on your requirements.