Mouse position in D3

Solution 1:

You have to use an array. That will store x and y like:

var coordinates= d3.mouse(this);
var x = coordinates[0];
var y = coordinates[1];

// D3 v4
var x = d3.event.pageX - document.getElementById(<id-of-your-svg>).getBoundingClientRect().x + 10
var y = d3.event.pageY - document.getElementById(<id-of-your-svg>).getBoundingClientRect().y + 10

Solution 2:

V3:

var svg = d3.select('body').append('svg')
    .attr('width', 600)
    .attr('height', 600)
    .on('mousemove', function() {
      console.log( d3.mouse(this) ) // log the mouse x,y position
    });

V4 and V5:

var svg = d3.select('body').append('svg')
    .attr('width', 600)
    .attr('height', 600)
    .on('mousemove', function() {
      console.log( d3.event.pageX, d3.event.pageY ) // log the mouse x,y position
    });

Solution 3:

You can understand the click and drag function through this example very well.Hope it will helps..

 var point = d3.mouse(this)
  , p = {x: point[0], y: point[1] };

http://jsfiddle.net/mdml/da37B/

Solution 4:

As commented above by chkaiser and The Composer the approach is different in version 6;

var coordinates = d3.pointer(this);
var x = coordinates[0];
var y = coordinates[1];

var svg = d3.select('body').append('svg')
    .attr('width', 600)
    .attr('height', 600)
    .on('mousemove', (event) => {
      var coords = d3.pointer( event );
      console.log( coords[0], coords[1] ) // log the mouse x,y position
    });

Further details @ D3 v6 migration guide