p1714867: Line chart from dataset

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

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    .line 
    {
      fill: none;
      stroke: black;
      stroke-width: 1.5px;
    }
      
      .circless 
    {
        fill : rgba(175,175,175,0.5);
        
     }
      .circless:hover
    {
      fill : "red";
    }
    
    .value 
    {
       font-size : 50;
       font-family : monospace;
       opacity : 0;
    }
    }
  </style>
</head>

var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500);

var width = 800;
    var height = 400;

var parseDate = d3.timeParse("%Y-%m");
    var displayDate = d3.timeFormat("%b %y");
    var displayValue = d3.format(",.0f");
    
    // Ordinal scale
    var x = d3.scaleTime()
        .range([0, width]);

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

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

d3.json("dataset.json", function(error, data) {
	  	if (error) throw error;

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

/* Display last value*/
      g.selectAll(".value").data([data[data.length -1]]).enter()
       .append("text")
        .text(function(d, i) { return displayValue(d.value); })
        .attr("class", "lastvalue")
        .attr("y", function(d) { return y(d.value); })
        .attr("x", width + 10)
        .style("font-size", 20)
        .style("font-family", "monospace");

g.selectAll(".line").data([data])
        .enter()
        .append("path")
        .attr("class", "line")
        .attr("d", line);
      
      //Create all the circles
      var circles = g.selectAll("circle")
                 .data(data)
                 .enter()
                 .append("circle")
      					 .attr("class", "circless")
      					 .attr("cx", function(d) { return x(d.date); })
       					 .attr("cy", function(d) { return y(d.value); })
       					 .attr("r", 10)

//Display labels (values)
       g.selectAll(".value").data(data).enter()
          .append("text")
          .text(function(d, i) { return displayValue(d.value); })
          .attr("class", "value")
          .attr("x", function(d) { return x(d.date); })
          .attr("y", function(d) { return y(d.value) - 15; })

//Display vertical dashed lines
      g.selectAll("dashedLine")
      							.data(data)
      							.enter()
      							.append("line")      							
                    .attr("x1",  function(d) {return x(d.date); })
                    .attr("y1",  function(d) {return y(d.value); })
                    .attr("x2",  function(d) { return x(d.date); })
                    .attr("y2", height)
                    .style("stroke-dasharray", ("3, 3"))
                    .style("stroke", "black")
      							.style("opacity",0);
      
      circles.on("mouseover", function(d, i) {
           d3.select(this)
             .style("fill", "red")
             .style("opacity", "1")
           	;
        	
          
        // Should be using Ids instead of values
      	d3.selectAll("text.value")
        	.filter(function(e, j) {return i === j;})
        	.transition().duration(202)
        	.style("font-size", 12)
        	.style("opacity","1");
        
        // Should be using Ids instead of values
      	d3.selectAll("line")
        	.filter(function(e, j) {return i === j; })
        	.transition().duration(500)
        	.style("font-size", 12)
        	.style("opacity","1");
        
        })

// Different color for the circles on mouseout   
			 .on("mouseout", function(d, i) {
      	d3.select(this)
          .transition()
          .duration(500)
          .style("fill", "rgba(175,175,175,0.5)");
       
        // Should be using Ids instead of values
        // Hide labels
      	d3.selectAll("text.value")
        	.filter(function(e, j) {return i === j;})
        	.transition()
        	.duration(500)
        	.style("font-size", 12)
        	.style("opacity","0");
      
       	//Hide vertical dashed-lines
        d3.selectAll("line")
          .filter(function(e, j) {return i === j;})
        	.transition()
          .duration(500)
        	.style("font-size", 12)
        	.style("opacity","0");
      	})
        ;

});

</script>
</body>

https://d3js.org/d3.v4.min.js