selection.call() method in D3 can aid in code organization and flexibility by eliminating the need to use chained method calls for every operation.

<!DOCTYPE html>

<html>

<head lang="en">

    <meta charset="UTF-8">

    <title></title>

    <script src="../bower_components/underscore/underscore-min.js"></script>

    <script src="../ventor/d3.min.js"></script>

    <style type="text/css">

        body {

            padding-top: 50px;

            padding-left: 100px;

        }

        #chartArea {

            width: 400px;

            height: 300px;

            background-color: #CCC;

        }

        .bar {

            display: inline-block;

            width: 20px;

            height: 75px; /* Gets overriden by D3-assigned height below */

            margin-right: 2px;

            /* fill: teal; *//* SVG doesn't have background prop, use fill instead*/

            z-index: 99;

        }

        .bubble, .center {

            display: inline-block;

            fill: purple;

            fill-opacity: 0.5;

            stroke: black;

            stroke-weight: 1px;;

            z-index: 15;

        }

        .center {

            z-index: 10;

        }

        .active {

            fill: magenta;

            fill-opacity: 0.5;

            stroke-width: 3px;

        }

        .axis path, .axis line {

            fill: none;

            stroke: #000;

            stroke-width: 1px;

            shape-rendering: crispEdges;

        }

    </style>

</head>

<body>

<button onclick="update()">Update</button>

<section id="chartArea"></section>

<script>

    function planTrasition(selection, duration, color){

        selection

                .transition()

                .duration(duration)

                .style('fill', color)

                .attr('cx', function(each_data, index) {

                    return xScale(each_data.x);

                })

                .attr('cy', function(each_data) {

                    return yScale(each_data.y);

                })

                .attr('r', function(each_data, i) {

                    return each_data.r;

                });

    }

    function stepTransition(selection) {

        selection.transition()

                .duration(600)

                .style('fill', "lightblue")

                .attr('cx', function(each_data, index) {

                    return xScale(each_data.x);

                })

                .transition()

                .duration(600)

                .attr('cy', function(each_data) {

                    return yScale(each_data.y);

                })

                .transition()

                .duration(600)

                .attr('r', function(each_data, i) {

                    return each_data.r;

                });

    }

    function newData(d){

        d.x = Math.round(Math.random() * 100);

        d.y = Math.round(Math.random() * 100);

        d.r = Math.round(5 + Math.random() * 10);

    }

    function update(){

        //Only the data which x < 50 will get update

        svg.selectAll('circle')

                .filter(function(d) {

                    return d.x < 50;

                })

                .each( newData)

                .call(stepTransition);

        svg.selectAll('circle')

                .filter(function(d) {

                    return d.x >= 50;

                })

                .each( newData)

                .call(planTrasition, 2000, "red");

    }

    var dataset = _.map(_.range(30), function(num) {

                return {

                    x: Math.round(Math.random() * 100),

                    y: Math.round(Math.random() * 100),

                    r: Math.round(5 + Math.random() * 10)

                };

            }), //reandom generate 15 data from 1 to 50

            margin = {top: 20, right: 20, bottom: 40, left: 40},

            w = 400 - margin.left - margin.right,

            h = 300 - margin.top - margin.bottom;

    var svg = d3.select('#chartArea').append('svg')

            .attr('width', w + margin.left + margin.right)

            .attr('height', h + margin.top + margin.bottom)

            .append('g') //The last step is to add a G element which is a graphics container in SBG.

            .attr('transform', 'translate(' + margin.left + ', ' + margin.top + ')'); //Then offset that graphic element by our left and top margins.

    var yScale = d3.scale.linear()

            .domain([0, d3.max(dataset, function(d) {

                return d.y; //tell the max function just need to care about y prop

            })])

            .range([h, 0]);

    var yAxis = d3.svg.axis()

            .scale(yScale)

            .orient('left')

            .ticks(10)

            .innerTickSize(10)

            .outerTickSize(10)

            .tickPadding(10);

    svg.append('g')

            .attr('class', 'y axis')

            .attr('transform', 'translate(0,0)')

            .call(yAxis);

    var xScale = d3.scale.linear()

            .domain([0, 100])

            .range([0, w]);

    var xAxis = d3.svg.axis()

            .scale(xScale)

            .orient('bottom')

            .ticks(10)

            .innerTickSize(6)

            .outerTickSize(12)

            .tickPadding(12);

    svg.append('g')

            .attr('class', 'x axis')

            .attr('transform', 'translate(0, ' + h + ')')

            .call(xAxis);

    svg.selectAll('circle')

            .data(dataset)

            .enter()

            .append('circle')// svg doesn't have div, use rect instead

            .attr('class', "bubble")

            .attr('cx', function(each_data, index) {

                return xScale(each_data.x);

            })

            .attr('cy', function(each_data) {

                return yScale(each_data.y);

            })

            .attr('r', function(each_data, i) {

                return each_data.r;

            })

            .on('mouseover', function() {

                d3.select(this).classed('active', true)

            })

            .on('mouseleave', function() {

                d3.select(this).classed('active', false)

            })

            .on('mousedown', function(d) {

                var p_cx = d.x, p_cy = d.y, p_r = d.r;

                d3.select(this).transition().duration(500).attr('r', d.r * 1.5);

                svg.append('circle')

                        .attr('class', "center")

                        .attr('cx', function() {

                            return xScale(p_cx);

                        })

                        .attr('cy', function() {

                            return yScale(p_cy);

                        })

                        .attr('r', function() {

                            return p_r / 4;

                        })

                        .style('fill', 'red');

            })

            .on('mouseup', function(d) {

                d3.select(this).transition().duration(250).delay(100).attr('r', d.r)

            });

</script>

</body>

</html>

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