Chart.js dynamic updates with data from database - Javascript Chart.js

Javascript examples for Chart.js:Chart Data

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Description

Chart.js dynamic updates with data from database

Demo Code

ResultView the demo in separate window 

<html lang="en">
   <head> 
      <title>Chart.js - Dynamically Update Chart Via Ajax Requests</title> 
   </head> 
   <body translate="no"> 
      <div style="width:50%;"> 
         <canvas id="mycanvas"></canvas> 
      </div> 
      <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script> 
      <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js"></script> 
      <script>
      // used for example purposes
function getRandomIntInclusive(min, max) {
  min = Math.ceil(min);//from  w w  w. j  av a  2  s  .c om
  max = Math.floor(max);
  return Math.floor(Math.random() * (max - min + 1)) + min;
}
var ctx_live = document.getElementById("mycanvas");
var myChart = new Chart(ctx_live, {
  type: 'bar',
  data: {
    labels: [],
    datasets: [{
      data: [],
      borderWidth: 1,
      borderColor:'#00c0ef',
      label: 'liveCount',
    }]
  },
  options: {
    responsive: true,
    title: {
      display: true,
      text: "Chart.js - Dynamically Update Chart Via Ajax Requests",
    },
    legend: {
      display: false
    },
    scales: {
      yAxes: [{
        ticks: {
          beginAtZero: true,
        }
      }]
    }
  }
});
var postId = 1;
var getData = function() {
  $.ajax({
    url: 'https://jsonplaceholder.typicode.com/posts/' + postId + '/comments',
    success: function(data) {
      myChart.data.labels.push("Post " + postId++);
      myChart.data.datasets[0].data.push(getRandomIntInclusive(1, 25));
      myChart.update();
    }
  });
};

setInterval(getData, 3000);

    
      </script>  
   </body>
</html>

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