javascript - Chart.js with JSON empty -


i'm having problems using readings json file fill in chart. found function here allows me pass api url , returns json data , works, decided loop through json array adding each reading in array , passing array chart function when load page chart empty, here code ` 

<!doctype html>             <html lang="en">             <head>                 <script src="chart.js"></script>             </head>              <body>                 <canvas id="mychart" width="400" height="400"></canvas>                 <div id="result"></div>                 <script>              var getjson = function(url) {                 return new promise(function(resolve, reject) {                 var xhr = new xmlhttprequest();                 xhr.open('get', url, true);                 xhr.responsetype = 'json';                 xhr.onload = function() {                   var status = xhr.status;                   if (status == 200) {                     resolve(xhr.response);                   } else {                     reject(status);                   }                 };                 xhr.send();               });             };              var json = getjson('http://ec2-54-152-138-146.compute-1.amazonaws.com:9000/system/listsystems').then(function(data) {                 alert(data.data[0].waterlevel);                   var chartdata =[];                     (var = 0; < data.length; i++){                         chartdata.push(data.data[i].waterlevel);                      }                         alert(chartdata);              var bardata = {                 labels: ['italy', 'uk', 'usa', 'germany', 'france', 'japan'],                 datasets: [                     {                         label: '2010 customers #',                         fillcolor: '#382765',                         data: chartdata                     },                     {                         label: '2014 customers #',                         fillcolor: '#7bc225',                         data: chartdata                     }                 ]             };              var context = document.getelementbyid('mychart').getcontext('2d');             var mychart = new chart(context).bar(bardata)                 result.innertext = data.data; //display result in html element             },               function(status) { //error detection....               alert('something went wrong.');             });</script>              </body>              </html>

your loop incorrect, @ stop condition in cycle.

you have use data.data.length instead of data.length: reference:

for (var = 0; < data.data.length; i++)


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