How to add tooltip for donut chart in loop using d3.js?

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by jerad , in category: Javascript , 2 months ago

How to add tooltip for donut chart in loop using d3.js?

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1 answer

by wilmer.lemke , 2 months ago

@jerad 

To add tooltips for each section of a donut chart in a loop using d3.js, you can do the following:

  1. Create a tooltip element in your HTML file where you want the tooltips to appear. This element can be a div element with an id that you can select later in your code.
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<div id="tooltip" style="display: none;"></div>


  1. Define the tooltip behavior in your d3.js code. This can be a function that shows and hides the tooltip based on mouse events.
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var tooltip = d3.select("#tooltip");

function showTooltip(text, event) {
  tooltip.html(text)
    .style("left", (event.pageX) + "px")
    .style("top", (event.pageY - 28) + "px")
    .style("display", "block");
}

function hideTooltip() {
  tooltip.style("display", "none");
}


  1. Add the tooltip functionality to your donut chart creation code. Assuming you have a dataset that you are using to create the donut chart in a loop, you can add mouseover and mouseout event listeners to each section of the chart to show and hide the tooltip.
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var data = [
  { label: "A", value: 30 },
  { label: "B", value: 20 },
  { label: "C", value: 50 }
];

var width = 400;
var height = 400;
var radius = Math.min(width, height) / 2;

var color = d3.scaleOrdinal(d3.schemeCategory10);

var svg = d3.select("body")
  .append("svg")
  .attr("width", width)
  .attr("height", height)
  .append("g")
  .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");

var arc = d3.arc()
  .innerRadius(100)
  .outerRadius(radius);

var pie = d3.pie()
  .value(function(d) { return d.value; });

var arcs = svg.selectAll("g.arc")
  .data(pie(data))
  .enter()
  .append("g")
  .attr("class", "arc");

arcs.append("path")
  .attr("d", arc)
  .attr("fill", function(d, i) {
    return color(i);
  })
  .on("mouseover", function(d, i) {
    showTooltip(data[i].label + ": " + data[i].value + "%", d3.event);
  })
  .on("mouseout", hideTooltip);


With this code, each section of the donut chart will display a tooltip with the label and value of the corresponding data point when the mouse is over the section, and hide the tooltip when the mouse moves away. You can customize the tooltip appearance and content as needed.