JSFiddle - React, Tailwind, and code Playground

by mccannf

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/d3/2.10.0/d3.v2.min.js"></script>

JavaScript

var dataset = [ 5, 10, 15, 20, 25 ];
var w = 1800;
var h = 300;
var barPadding = 1;

setInterval(function(){
    dataset.push(Math.floor(Math.random()*51));
    redraw();
},1000);

draw();

var svg;

function draw(){

    d3.select("svg").remove();
    svg = d3.select("body")
            .append("svg")
        .attr("width", w)
        .attr("height", h);

    svg.selectAll("rect").data(dataset)
        .enter()
        .append("rect")
        .attr("x", function(d, i){return 12*i;})
        .attr("y", function(d){return h -d*4; })
        .attr("width", 11)
        .attr("height", function(d) { return d * 4; })
        .attr("fill", "teal")
        .attr("fill", function(d) { return "rgb(0, 0, " + (d * 10) + ")";});
}

function redraw() {
     var rect = svg.selectAll("rect")
         .data(dataset);
   
     rect.enter().insert("rect", "line")
         .attr("x", function(d, i) { return 12*(i+1); })
         .attr("y", function(d) { return h -d*4 })
         .attr("width", 11)
         .attr("height", function(d) { return d * 4; })
         .attr("fill", "teal")
         .attr("fill", function(d) { return "rgb(0, 0, " + (d * 10) + ")";})

     rect.transition()
         .duration(500)
         .attr("x", function(d, i) { return 12*i; });
 
}