Adding Datapoint from Form Input - CanvasJS JavaScript Charts

Adding Datapoint from Form Input - CanvasJS JavaScript Charts

by canvasjs

HTML

<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
<br/><!-- Just so that JSFiddle's Result label doesn't overlap the Chart -->
<form id="submitDataPoints">
  X-Value: <input id = "xValue" type= "number" placeholder= "Enter x-value"/>
  Y-Value: <input id = "yValue"/ type = "number" placeholder= "Enter y-value"/>
  <button type="submit">Submit</button>
</form>
<div id="chartContainer" style="height: 360px; width: 100%;"></div>

JavaScript

var dps = [];

var chart = new CanvasJS.Chart("chartContainer", {
  data: [{
    type: "column",
    dataPoints: dps
  }]
});

chart.render();

document.getElementById("submitDataPoints").onsubmit=function() {  
  var xValue = parseFloat(document.getElementById("xValue").value);
  var yValue = parseFloat(document.getElementById("yValue").value);

  if (yValue || yValue === 0 && xValue || xValue === 0)
    dps.push({x: xValue, y: yValue});

  chart.render();
  return false;
}