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|<- [[Creating meaningful color scales]]|[[Using transitions and animations]] ->|

===== adding events =====

-> D3 provide is own methods for handling events

-> on()

<code>
var bardata = [];

for (var i = 0; i < 100; i++) {
  bardata.push(Math.random() * 30);
}

var height = 400;
var width = 600;
var barWidth = 50;
var barOffset = 5;

// linear scale
var yScale = d3.scale.linear()
  .domain([0, d3.max(bardata)])
  .range([0, height]);

// ordinal scale
var xScale = d3.scale.ordinal()
  .domain(d3.range(0, bardata.length))
  .rangeBands([0, width]);

var colors = d3.scale.linear()

  //.domain([0, d3.max(bardata)])
	//.domain([0, bardata.length])
	.domain([0, bardata.length * .33, bardata.length * .66, bardata.length])

	//.range(['#FFB832', '#C61C6F']);
	.range(['#B58929', '#C61C6F', '#268BD2', '#85992C']);

d3.select('#chart').append('svg')
.attr('width', width)
.attr('height', height)
.style('background', '#C9D7D6')
.selectAll('rect').data(bardata)
.enter().append('rect')

  //.style('fill', colors)
  .style('fill', function (d, i) {
    return colors(i);
  })
  .attr('width', xScale.rangeBand())
  .attr('height', function (d) {
    return yScale(d);
  })
  .attr('x', function (d, i) {
    return xScale(i);
  })
  .attr('y', function (d) {
    return height - yScale(d);
  })
  .on('mouseover', function (d) {
    d3.select(this)
  .style('opacity', .5);
  })
  .on('mouseout', function (d) {
    d3.select(this)
  .style('opacity', 1);
  });
</code>