title: d3 Axis Ticks Not Updating
body: <p>I have taken the example from <a href="http://bl.ocks.org/mbostock/3883245" rel="nofollow">here</a> and I am modifying it slightly so that the graph is drawn when the page loads and the line is drawn when a user selects a file from a jsTree. That is all working fine and the data is plotted correctly. But, the tick marks remain 0 to 1 on the Y axis and 6 PM to .001 on the x axis. I can't figure out how to update them based on the new data. I am just learning js and d3 so I'm sure the knowledge gap is the issue here. But, after a couple hours of being unable to resolve the issue, it was time to ask.</p>
  
  <pre><code> &lt;script&gt;
    var margin = {top: 30, right: 20, bottom: 30, left: 50},
      width = 960 - margin.left - margin.right,
      height = 500 - margin.top - margin.bottom;
    var x = d3.time.scale()
      .range([0, width]);
    var y = d3.scale.linear()
      .range([height, 0]);
  
    var xAxis = d3.svg.axis()
      .scale(x)
      .orient("bottom");
  
    var yAxis = d3.svg.axis()
      .scale(y)
      .orient("left");
    var svg;
  
  window.onload = function(){
     svg = d3.select("#MainDiv").append("svg")
      .attr("id","myGraph")
    .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("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis);
  
    svg.append("g")
        .attr("class", "y axis")
        .call(yAxis)
      .append("text")
        .attr("transform", "rotate(-90)")
        .attr("y", 6)
       .attr("dy", ".71em")
        .style("text-anchor", "end")
        .text("Price ($)");
  }
  
  function updateGraph(filename){
  
    d3.xhr("http://127.0.0.1:8080/Data/TreeData/getGraphData?filename="+filename, function(error,data){
  
  
    var data = d3.tsv.parse(data.responseText);
    var parseDate = d3.time.format("%d-%b-%y").parse;
    var line = d3.svg.line()
      .x(function(d) { return x(d.date); })
      .y(function(d) { return y(d.close); });
  
     svg.selectAll("y axis")
              .call(yAxis)
  
     svg.selectAll("x axis")
              .call(xAxis);
  
  
    data.forEach(function(d) {
      d.date = parseDate(d.date);
      d.close = +d.close;
    });
  
    x.domain(d3.extent(data, function(d) { return d.date; }));
    y.domain(d3.extent(data, function(d) { return d.close; }));
  
  
    svg.append("path")
        .datum(data)
        .attr("class", "line")
        .attr("d", line);
  });   
  }
  
  &lt;/script&gt;
  </code></pre>