TP Data Viz - dynamic line chart

forked from romsson's block: simple line chart from dataset

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v3.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .line {
      fill: none;
      stroke: black;
      stroke-width: 1.5px;
    }
  </style>
</head>

<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)

var width = 800;
    var height = 400;

// https://bl.ocks.org/zanarmstrong/raw/05c1e95bf7aa16c4768e/
    var parseDate = d3.time.format("%Y-%m");
    var displayDate = d3.time.format("%b %y");
    var displayValue = d3.format(",.0f");
    
    // Ordinal scale
    var x = d3.scale.ordinal()
        .rangeRoundBands([0, width], .5);

var y = d3.scale.linear()
        .range([height, height - 200]);

var line = d3.svg.line()
        .x(function(d) { return x(d.name); })
        .y(function(d) { return y(d.value); });
    
    var g = svg.append("g")
    	.attr("transform", "translate(50, 0)")
    
   	d3.json("dataset.json", function(data) {

// Pre-processing
      data.forEach(function(d) {
				d.value;// = +d.value;
        d["date"] = parseDate.parse(d["date"]);
      });
      
      x.domain(data.map(function(d) { return d.name; }));
			y.domain([0, d3.max(data, function(d) { return d.value; })]);
      
      svg.selectAll("text").data(data).enter()
       .append("text")
        .text(function(d, i) { return displayDate(d.date); })
        .attr("y", 420)
        .attr("x", function(d) { return x(d.name); })
        .style("font-size", 10)
        .style("font-family", "monospace");

g.selectAll(".value").data([data[data.length -1]]).enter()
       .append("text")
        .text(function(d, i) { return displayValue(d.value); })
        .attr("class", "value")
        .attr("y", function(d) { return y(d.value); })
        .attr("x", width - 20)
        .style("font-size", 20)
        .style("font-family", "monospace");

g.selectAll("path").data([data]).enter().append("path")
        .attr("class", "line")
        .attr("d", line);
      
      g.selectAll('circle').data(data).enter().append('circle')
				.attr("cx", function(d) { return x(d.name); })
				.attr("cy", function(d) { return y(d.value); })
				.attr("r", 12)
				.style("stroke", "black")    // set the line colour
    		.style("fill", "none")
      
       	.on("mouseover", function(d) {       
        
      	d3.select(this).style("fill", "red").style("stroke", "red");
        
        g.selectAll("#text-tooltip").data([d]).enter().append("text")
        .attr("id", "text-tooltip")
        .text(function(d, i) { return d.value; })
        .attr("y", function(d) { return y(d.value)-20; })
        .attr("x", function(d) { return x(d.name); })
        .style("font-size", 20)
        .style("font-family", "monospace");
        
        g.selectAll("#dash-line").data([d]).enter().append("line")
          .attr("id", "dash-line")
        	.attr("x1", function(d) { return x(d.name); })
 					.attr("y1", function(d) { return y(d.value); })
        	.attr("x2", function(d) { return x(d.name); })
        	.attr("y2", height)
        	.style("stroke-dasharray", ("3, 3"))
        	.style("stroke-width", 1)
				  .style("stroke", "black");     
      })
      
    	.on("mouseout", function(d) {
      	d3.select(this).transition().duration(100).style("fill", "none")
          .style("stroke", "black");
        
        g.selectAll("#text-tooltip").remove()
        g.selectAll("#dash-line").remove()
      
    	});
    });

</script>
</body>

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