Read CSV Data from an Ajax Call in JavaScript

How to make Ajax calls in javascript for Plotlyjs.

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function makeplot() {
  d3.csv("", function(data){ processData(data) } );


function processData(allRows) {

  var x = [], y = [], standard_deviation = [];

  for (var i=0; i<allRows.length; i++) {
    row = allRows[i];
    x.push( row['AAPL_x'] );
    y.push( row['AAPL_y'] );
  console.log( 'X',x, 'Y',y, 'SD',standard_deviation );
  makePlotly( x, y, standard_deviation );

function makePlotly( x, y, standard_deviation ){
  var plotDiv = document.getElementById("plot");
  var traces = [{
    x: x,
    y: y

  Plotly.newPlot('myDiv', traces,
    {title: 'Plotting CSV data from AJAX call'});