问从PHP类中将d3.js附加到div

EN

var svg = d3.select("'.$this->ChartDiv.'").append("div")

class Chart{

    //Public variables:
    public $tsvFile;
    public $JsonLocation;
    public $JS;
    public $ChartDiv;
    public $Width;
    public $Height;

    function Set($What, $Value){
        $this->$What = $Value;
    }


    //For json
    function BuildJson(){
                    $DataOut = '
<style>
.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.x.axis path {
  display: none;
}

.line {
  fill: none;
  stroke: steelblue;
  stroke-width: 1.5px;
}

</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js" charset="utf-8"></script>
    <script type=text/javascript">

var margin = {top: 20, right: 20, bottom: 30, left: 50},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var parseDate = d3.time.format("%d-%b-%Y").parse;

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 line = d3.svg.line()
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.close); });

var svg = d3.select("'.$this->ChartDiv.'").append("svg:svg")
    .attr("width", '.$this->Width.')
    .attr("height", '.$this->Height.')
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

d3.json("'.$this->JsonLocation.'", function(error, data) {
    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("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("Profit (Millions)");

  svg.append("path")
      .datum(data)
      .attr("class", "line")
      .attr("d", line);
});

</script>';

        $this->JS = $DataOut;            
    }
}

$Chart = new Chart();
$Chart->Set("JsonLocation", "json_item.php?item=123");
$Chart->Set("ChartDiv", "#Chart");
$Chart->Set("Width", "450");
$Chart->Set("Height", "700");
$Chart->BuildJson();
echo $Chart->JS;