Unlock the mystery of identifying which trace is selected in the plot.ly JS legend

When using plot.ly, it is possible to set up a listener for legend click events. I am wondering how to determine which trace in the legend was clicked on. To provide a more specific example, let's say there are two traces (trace0, trace1) in a line graph. If the user clicks on trace0 in the legend, I would like to show an alert that says "trace0". Similarly, when the user clicks on trace1 in the legend, I want a different message to appear. While I am able to create alerts successfully, I have not been able to find any documentation on how plot.ly distinguishes between the traces clicked on in the legend. Any guidance would be appreciated!

javascriptplotlyonclicklistener

Answer №1

Reviewing the documentation on Event Handlers reveals that you can access event information through the use of the data attribute.

const trace1 = {
  x: [1, 2, 3, 4],
  y: [10, 15, 13, 17],
  type: 'scatter'
};

const trace2 = {
  x: [1, 2, 3, 4],
  y: [16, 5, 11, 9],
  type: 'scatter'
};

const data = [trace1, trace2];

Plotly.newPlot('myDiv', data);

const myPlot = document.getElementById('myDiv');

myPlot.on("plotly_click", function(data) {
    // retrieve event details from the data
    console.log(data);
});

CodePen Link

Answer №2

When a user clicks on the legend of a specific trace, the id can be retrieved using 'event.curveNumber', as demonstrated below. The code provided fulfills the requirements specified by the original poster.

const plot_container = document.getElementById("plotly-chart"); //please ensure to use the appropriate div id

let data = [
  {
    x: [1, 2, 3, 4, 5],
    y: [10, 12, 8, 15, 11],
    mode: "lines",
    name: "trace0",
  },
  {
    x: [1, 2, 3, 4, 5],
    y: [6, 8, 4, 9, 7],
    mode: "lines",
    name: "trace1",
  },
];

let layout = {
  legend: {
    itemclick: false, // Disabling default click behavior
  },
};

Plotly.newPlot(plot_container, data, layout);

plot_container.on("plotly_legendclick", function (event) {
  alert(data[event.curveNumber]["name"]);
});

If the event is logged to the console, additional details will be displayed.

plot_container.on("plotly_legendclick", function (event) {
  console.log(event);
});

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