fresh block

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
	<script src="https://d3js.org/d3.v3.min.js"></script>
  <style>
    .bar {
	fill: steelblue;
}
    .subBar{

fill: steelblue;
    }

.axis text {
	font: 10px sans-serif;
  user-select: none;
}
 
.axis path,
.axis line {
	fill: none;
	stroke: #000;
	shape-rendering: crispEdges;
}

.x.axis path {
	display:  none;
}

rect.mover {
            fill: lightSteelBlue;
            fill-opacity: .5;

}
    
.brush .extent {
  stroke: #fff;
  fill-opacity: .125;
  shape-rendering: crispEdges;
}
.tooltip {	
    position: absolute;			
		pointer-events: none;
    padding: 12px;				
    background: white;	
    border: 1px solid gray;	
  	border-radius: 4px;
}
    
.tooltip-name
{
	text-align: center;
  color: steelblue;
}
.tooltip-value
{
	text-align: left;
  margin-top: 5px;
}
  </style>
</head>

<body>
  <!DOCTYPE html>
    
<script>  
var DATA_COUNT = 66;
var MAX_LABEL_LENGTH = 10;
var MIN_LABEL_LENGTH = 50;
var MAX_LABEL_LENGTH_ALLOWED = 27;
var MARGIN_MODIFIER_CONSTANT = 4; 
 
var BAR_WIDTH = 20;
var BAR_PADDING = 5; 
  
var data = [];  
   
for (var i = 0; i < DATA_COUNT; i++) {
    var datum = {};
    var plusOrMinus = Math.random() < 0.5 ? -1 : 1;
    datum.name = stringGen(MIN_LABEL_LENGTH, MAX_LABEL_LENGTH);
    datum.value = Math.floor(Math.random() * 600 * plusOrMinus);
    data.push(datum);
}

function stringGen(minLength, maxLength) {
    var text = "";
    var charset = "abcdefghijklmnopqrstuvwxyz0123456789";

for (var i = 0; i < getRandomArbitrary(minLength, maxLength); i++) {
        text += charset.charAt(Math.floor(Math.random() * charset.length));
    }

return text;
}

function getRandomArbitrary(min, max) {
    return Math.round(Math.random() * (max - min) + min);
}

var maxLabelLength =d3.max(data.map(function(d){ return d.name.length})); 
var marginModifier = maxLabelLength < MAX_LABEL_LENGTH_ALLOWED ?  maxLabelLength : MAX_LABEL_LENGTH_ALLOWED;

var margin = {
    top: 50,
    right: 30,
    bottom: 40 + marginModifier * MARGIN_MODIFIER_CONSTANT,
    left: 80
};
var marginOverview = {
    top:  50 + marginModifier * MARGIN_MODIFIER_CONSTANT,
    right: 30,
    bottom: 0,
    left: 30
};

var width = 650 - margin.left - margin.right;
var heightOverview = 75;
var height = 550 - margin.top - margin.bottom;

var barWidth = width / data.length;
var overviewVisible = true;

if (barWidth > BAR_WIDTH) {
    BAR_WIDTH = barWidth * 90 / 100;
    BAR_PADDING = barWidth * 10 / 100;
    overviewVisible = false;
}

var x = d3.scale.ordinal()
    .domain(data.map(function(d) {
        return d.name;
    }))
    .range(data.map(function(d, i) {
        return i * (BAR_WIDTH + BAR_PADDING);
    }));

var y = d3.scale.linear()
    .domain([d3.min(data, function(d) {
        return d.value;
    }), Math.abs(d3.max(data, function(d) {
        return d.value;
    }))])
    .range([height, 0]).nice();

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

var svg = d3.select("body")
    .append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom + heightOverview + marginOverview.top + marginOverview.bottom);

var chart = svg.append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var defs = chart.append("defs");

defs.append("clipPath").attr('id', 'chart-clip-path').append('rect')
    .attr('width', width) //Set the width of the clipping area
    .attr('height', height); // set the height of the clipping area

defs.append("clipPath").attr('id', 'x-axis-clip-path').append('rect')
    .attr('width', width) //Set the width of the clipping area
    .attr('height', height + margin.bottom); // set the height of the clipping area

var barsGroup = chart.append('g');
barsGroup.attr('clip-path', 'url(#chart-clip-path)');

var xAxisGroup = chart.append("g").attr('class', 'x-axis')

xAxisGroup.append('g')
    .attr("class", "x axis")
    .attr("transform", "translate(" + (BAR_WIDTH + BAR_PADDING) / 2 + "," + height + ")")
    .call(xAxis)
    .selectAll("text")
    .attr("y", 10)
    .attr("x", -10)
    .attr("dy", 0)
    .attr("transform", "rotate(-60)")
    .style("text-anchor", "end")
		.text(function (d) {
     if(d.length > MAX_LABEL_LENGTH_ALLOWED)
         return d.substring(0,MAX_LABEL_LENGTH_ALLOWED)+'...';
     else
         return d;                       
 });

xAxisGroup.attr('clip-path', 'url(#x-axis-clip-path)');

var yAxisGroup = chart.append("g").attr("class", "y axis")

yAxisGroup.call(yAxis);
  
var div = d3.select("body")
	.append("div")  
	.attr("class", "tooltip")
	.style("opacity", 0);

var xAxisLabel = chart.append("text")
            .attr("text-anchor", "middle")  // this makes it easy to centre the text as the transform is applied to the anchor
            .attr("transform", "translate("+ (width/2) +","+(height + marginOverview.top )+")")  // centre below axis
            .text("Name");
  
var yAxisLabel = chart.append("text")
            .attr("text-anchor", "middle")  // this makes it easy to centre the text as the transform is applied to the anchor
            .attr("transform", "translate("+ -margin.left / 2 +","+(height/2)+")rotate(-90)")  // text is drawn off the screen top left, move down and out and rotate
            .text("Value");

if (overviewVisible) {
    var zoom = d3.behavior.zoom().scaleExtent([1, 1]);
//     var zoomRect = chart.append("rect")
//         .attr("width", width)
//         .attr("height", height)
//         .attr("fill", "none")
//         .attr("pointer-events", "all")
//         .call(zoom);

var xOverview = d3.scale.ordinal()
        .domain(data.map(function(d) {
            return d.name;
        }))
        .rangeBands([0, width], BAR_PADDING / BAR_WIDTH, 0);

var yOverview = d3.scale.linear().range([heightOverview, 0]);

yOverview.domain(y.domain());

var overviewGroup = chart.append('g')
        .attr('width', width)
        .attr('height', heightOverview);

var subBars = overviewGroup.append('g').selectAll('.subBar')
        .data(data)

subBars.enter().append("rect")
        .classed('subBar', true)
        .attr({
            height: function(d) {
                return Math.abs(yOverview(d.value) - yOverview(0));
            },
            width: function(d) {
                return xOverview.rangeBand()
            },
            x: function(d) {
                return xOverview(d.name);
            },
            y: function(d) {
                return height + marginOverview.top + (d.value > 0 ? yOverview(d.value) : yOverview(0));
            }
        });

var overviewRect = overviewGroup.append('rect')
        .attr('y', height + marginOverview.top)
        .attr('width', width)
        .attr('height', heightOverview)
        .style("opacity", "0")
        .style("cursor", "pointer").on("click", click);
  
    var selectorWidth = (width / (BAR_WIDTH) * (xOverview.rangeBand()));
    var selector = chart.append("rect")
        .attr("class", "mover")
        .attr("x", 0)
        .attr("y", height + marginOverview.top)
        .attr("height", heightOverview)
        .attr("width", selectorWidth)
        .attr("pointer-events", "all")
        .attr("cursor", "ew-resize")
        .call(d3.behavior.drag().on("drag", drag));
}  
           
function click() {
    var newX = null;
    var selectorX = null;
    var customScale = d3.scale.linear().domain([0, width]).range([0, ((BAR_WIDTH + BAR_PADDING) * data.length)])

selectorX = (d3.event.x - marginOverview.left) - selectorWidth / 2;
    newX = customScale(selectorX);
    if (selectorX > width - selectorWidth) {
        newX = customScale(width - selectorWidth);
        selectorX = width - selectorWidth;
    } else if (selectorX - (selectorWidth / 2) < 0) {
        newX = 0;
        selectorX = 0
    }
    selector.transition().attr("x", selectorX)
    bars.transition().duration(300).attr("transform", "translate(" + (-newX) + ",0)");

chart.transition().duration(300).select(".x.axis").attr("transform", "translate(" + -(newX - (BAR_WIDTH + BAR_PADDING) / 2) + "," + (height) + ")");
    chart.select(".y.axis").call(yAxis);

var transformX = (-(d3.event.x - selectorWidth) * ((BAR_WIDTH + BAR_PADDING) * data.length) / width);
    zoom.translate([-newX, 0])
}

// function zoomed() {
//     var t = zoom.translate(),
//         tx = t[0],
//         ty = t[1];
//     var xEndValue = x(data[data.length - 1].name) - (width) + (BAR_WIDTH + BAR_PADDING) + BAR_WIDTH / 2;
//     if (tx <= 0 && tx > -xEndValue) {
//         bars.attr("transform", "translate(" + d3.event.translate[0] + ",0)");
//         chart.select(".x.axis").attr("transform", "translate(" + (d3.event.translate[0] + (BAR_WIDTH + BAR_PADDING) / 2) + "," + (height) + ")");
//         chart.select(".y.axis").call(yAxis);

//         var selectorX = Math.abs(width * tx / ((BAR_WIDTH + BAR_PADDING) * data.length))
//         selector.attr("x", selectorX)
//     }

//     if (tx < -xEndValue) {
//         zoom.translate([-xEndValue, ty])
//     }
//     if (tx >= 0) {
//         zoom.translate([0, ty])
//     }
// }

function drag() {
    var nx = d3.event.dx;
    var t = zoom.translate(),
        tx = t[0],
        ty = t[1];

var selectorX = parseFloat(selector.attr("x")) + nx
    var customScale = d3.scale.linear().domain([0, width]).range([0, ((BAR_WIDTH + BAR_PADDING) * data.length)])
    
    var transformX = customScale(selectorX)
    var xEndValue = customScale(xOverview(data[data.length - 1].name)) - customScale(selectorWidth) + BAR_WIDTH

if (transformX < xEndValue && transformX >= 0) {
        selector.attr("x", selectorX)
        bars.attr("transform", "translate(" + -transformX + ",0)");
        chart.select(".x.axis").attr("transform", "translate(" + (-transformX + (BAR_WIDTH + BAR_PADDING) / 2) + "," + (height) + ")");
        chart.select(".y.axis").call(yAxis);
        zoom.translate([transformX, 0])
    }
}

</script>
</body>

Updated missing url http://d3js.org/d3.v3.min.js to https://d3js.org/d3.v3.min.js

https://d3js.org/d3.v3.min.js