myLbs

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body {
      background-color: #ffffff;
    }
    .line {
      fill: none;
      stroke: MidnightBlue;
      stroke-width: 2px;
    }
    .grid line {
    stroke: lightgrey;
    stroke-opacity: 0.6;
    shape-rendering: crispEdges
  }
  .grid path {
    stroke-width: 0;
  }
    .area {
  fill: none;
  clip-path: url(#clip);
}
    .dot:hover {
      r: 4px;
      stroke-width: 3px;
    }
    div.tooltip {
  position: absolute;
  text-align: center;
  width: 60px;
  height: 28px;
  padding: 2px;
  font: 12px sans-serif;
  background: lightsteelblue;
  border: 0px;
  border-radius: 8px;
  pointer-events: none;
}
  </style>
</head>

<body>
  <script>
 var margin = {top: 20, right: 20, bottom: 100, left: 50},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
    
var parseTime = d3.timeParse("%d-%b-%y");
var formatTime = d3.timeFormat("%b %e %y");
    
var x = d3.scaleTime().range([0, width]);
var y = d3.scaleLinear().range([height, 0]);
  
var div = d3.select("body").append("div")
    .attr("class", "tooltip")
    .style("opacity", 0);

var valueline = d3.line()
	.curve(d3.curveBasis)
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.lbs); });

var area = d3.area()
    .curve(d3.curveMonotoneX)
    .x(function(d) { return x(d.date); })
    .y0(height)
    .y1(function(d) { return y(d.lbs); });

var xAxis = d3.axisBottom(x),
    yAxis = d3.axisLeft(y);
    
var zoom = d3.zoom()
	.scaleExtent([1,32])
	.translateExtent([0,0],[width,height])
	.extent([0,0],[width,height])
	.on("zoom",zoomed)
    
var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform",
          "translate(" + margin.left + "," + margin.top + ")");

svg.append("defs").append("clipPath")
    .attr("id", "clip")
  .append("rect")
    .attr("width", width)
    .attr("height", height);
 
var g = svg.append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
    
function make_x_gridlines() {
    return d3.axisBottom(x)
    	.ticks(20)
  }
function make_y_gridlines() {
    return d3.axisLeft(y)
    	.ticks(12)
  }
    
d3.tsv("myLbs.tsv",function(error,data){
  if (error) throw error;
  
 data.forEach(function(d){
	d.date = parseTime(d.date)
  d.lbs = +d.lbs;
});

x.domain(d3.extent(data, function(d){ return d.date}));
 y.domain([200, d3.max(data, function(d) { return d.lbs; })]);
 
  
 svg.append("g")
  		.attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x).ticks(12))
 .selectAll("text")
  			.style("text-anchor","end")
  			.attr("dx","-.8em")
  			.attr("dy",".15em")
  			.attr("transform","rotate(-45)");

svg.append("g")
  		.attr("class","axis")
      .call(d3.axisLeft(y)
           );
   svg.append("g")
  		.attr("class","grid")
  		.attr("transform","translate(0," + height + ")")
  		.style("stroke-dasharray",("3,3"))
  		.call(make_x_gridlines()
            .tickSize(-height)
            .tickFormat("")
            )

svg.append("g")
  		.attr("class","grid")
  		.style("stroke-dasharray",("3,3"))
  		.call(make_y_gridlines()
            .tickSize(-width)
  .tickFormat("")
            )
 svg.append('path')
	.data([data])
	.attr('class','line')
	.attr('d',valueline)
 
svg.selectAll("dot")
     .data(data)
   .enter().append("circle")
     .attr("r", 3)
			.attr("class","dot")
			.attr("fill","IndianRed")
			.attr("stroke","Orange")
			.attr("stroke-width","1px")
     .attr("cx", function(d) { return x(d.date); })
     .attr("cy", function(d) { return y(d.lbs); })
     .on("mouseover", function(d) {
       div.transition()
         .duration(200)
         .style("opacity", .8);
       div.html(formatTime(d.date) + "<br/>" + d.lbs + " lbs")
         .style("left", (d3.event.pageX + 10) + "px")
         .style("top", (d3.event.pageY - 28) + "px");
       })
     .on("mouseout", function(d) {
       div.transition()
         .duration(500)
         .style("opacity", 0);
       });

});
    
function zoomed() {
  var t = d3.event.transform, xt = t.rescaleX(x);
  g.select(".area").attr("d", area.x(function(d) { return xt(d.date); }));
  g.select(".axis--x").call(xAxis.scale(xt));
}

</script>
</body>

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