title: how to replace comma with dot
body: <p>I am having comma values inside my json and i want when i get those values i get them in dot so basically I want to convert my comma values into dot values..my json looks like and its always fixed that i will get comma values at val003.
  I know something to do like var new = new.replace(/,/g, '.') . but how can i specify my val003 here for the conversion. Thank you in advance</p>
  
  <p>My html</p>
  
  <pre><code>&lt;!doctype html&gt;
  
  &lt;html&gt;
  
  &lt;head&gt;
  
      &lt;meta charset="UTF-8"&gt;
      &lt;meta content="utf-8" http-equiv="encoding"&gt;
        &lt;div id="below"&gt;
          &lt;div id="chart"&gt;&lt;/div&gt;
      &lt;/div&gt;
      &lt;script&gt;
          var jsonURL = 'avb.json';
          var myData = [];
          var fliterdata = [];
          var tempdata = [];
          var selectop = "";
          var selectDate = false;
          var chartType = chartType || 'bar';
  
          function filterJSON(json, key, value) {
              var result = [];
              for (var foo in json) {
                  var extractstr = json[foo][key] ;
                  extractstr=String(extractstr);
  
                  if (extractstr.slice(3)== value) {
  
                      result.push(json[foo]);
  
                 }
              }
              return result;
          }
          function selectValue(d) {    
              switch (selectop) { //d object select particular value for Y axis
                  case "01":
                      return d.val001;
                      break;
                  case "02":
                      return d.val002;
                      break;
                  case "03":
                      return d.val003;
                      break;
                  case "04":
                      return d.val004;
                      break;
                 default:
                      //console.log("default");
                      return d.val001;
              }
  
  
          }
  
        var line = d3.svg.line()
                  .x(function(d) {
                      return xScale(d.date);
                  })
                  .y(function(d) {
                      return yScale(selectValue(d));
                  })
                  .interpolate("monotone")
                  .tension(0.9);
  
  
  
  
              yScale.domain([0, d3.max(tempData, function(d) {
                  return +selectValue(d);
              })]);
  
              var svg = d3.select('#chart').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 + ")");
  
  
              if (chartType == 'bar') {
                  svg
                          .selectAll(".bar") //makes bar
                          .data(tempData)
                          .enter().append("rect")
                          .attr("class", "bar")
                          .style("fill", "teal")
                          .attr("x", function(d) {
                              return xScale(d.date);
                          }).attr("width", xScale.rangeBand())
                          .attr("y", function(d) {
  
  
                              return yScale(selectValue(d));
                          }).attr("height", function(d) {
  
                      console.log("as", d.value);
                      return height - yScale(selectValue(d));
                  })
              }
  
              if (chartType == 'line') {
                  svg.append("path") // Add the line path.
                          .data(tempData)
                          .attr("class", "line")
                          .attr("d", line(tempData));
              }
  
          }
          d3.json(jsonURL, function(data) {
  
              myData = data; //data from json in mydata
             d.val003.replace(",",".")
              myData.forEach(function(d) {
  
                  d.date = new Date(d.date);
                  d.date = new Date(d.date + " UTC");
  
              });
  
              $("#listbox").on("click", function() {
  
                  var key = $(this).val();
                  console.log("key:", key);
                  var value = $('#listbox option:selected').text();
                  console.log("vaue:", value);
  
                  selectop = String(key);
  
                  selectop = selectop.slice(-2);
                  console.log("mydata: ", myData);
                  console.log("selectops:", selectop);
  
                  fliterdata = filterJSON(myData, key, value); //selected value from user and picks the whole element that contains that attribute
  
                  console.log("fliterdata: ", fliterdata);
                  tempData = fliterdata; //graph made by temp data
                  if (selectDate)
                      render(true);
              });
          });
  
          function selectChartType(type) {
              chartType = type;
              render(true);
          }
      &lt;/script&gt;
      &lt;/body&gt;
  &lt;/div&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>