javascript - highcharts dynamic categories not working -


i using below method populate categories in highcharts dynamically not working me

var weeklyindicators; var cats = ''; $.when(     $.getjson('weeklyindicators', function(data) {         weeklyindicators = data;     }) ).then(function() {       $.each(weeklyindicators, function(i, item) {         if (cats.indexof(item.indicatortimestamp) == -1){             cats += "'" +  item.indicatortimestamp + "'" + ',';         }     });     cats = cats.substring(0, cats.length - 1);     console.log(cats);     // here output: '2016-01-30','2016-01-31','2016-02-01','2016-02-02','2016-02-03','2016-02-04','2016-02-05'     $('#container').highcharts({         chart: {             type: 'column'         },         title: {             text: 'monthly average rainfall'         },         subtitle: {             text: 'source: worldclimate.com'         },         xaxis: {             categories: [cats],             crosshair: true         },         yaxis: {             min: 0,             title: {                 text: 'rainfall (mm)'             }         },         tooltip: {             headerformat: '<span style="font-size:10px">{point.key}</span><table>',             pointformat: '<tr><td style="color:{series.color};padding:0">{series.name}: </td>' +                 '<td style="padding:0"><b>{point.y:.1f} mm</b></td></tr>',             footerformat: '</table>',             shared: true,             usehtml: true         },         plotoptions: {             column: {                 pointpadding: 0.2,                 borderwidth: 0             }         },         series: [{             name: 'tokyo',             data: [49.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6]          }, {             name: 'new york',             data: [83.6, 78.8, 98.5, 93.4, 106.0, 84.5, 105.0]          }, {             name: 'london',             data: [48.9, 38.8, 39.3, 41.4, 47.0, 48.3, 59.0]          }, {             name: 'berlin',             data: [42.4, 33.2, 34.5, 39.7, 52.6, 75.5, 57.4]          }]     }); });

if copy/paste output console.log, working fine, help?

below screenshot

enter image description here

also, need series dynamic, appreciated.

use 

var cats =[]  $.each(weeklyindicators, function(i, item) {     if (cats.indexof(item.indicatortimestamp) == -1){         cats.push(item.indicatortimestamp);     } });

and use cats array in categories directly 

categories = cats //not in []

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