Create a chart with Qlik Sense Visualization API

visualization_create.js

app.visualization.create('barchart',   // a bar chart
  ["Case Owner Group",                 // one dimension
   "=Avg([Case Duration Time])"],      // one measure       
  {"title":"On the fly barchart"}).    // set the title   
then(function(vis){                    // when its ready    
  vis.show("QV03");                    // show the chart
});