Name of my file = myFile.json. Based on my trials and the documentation I read, the following works for me pretty well. 

<script>

var myData; 

$.get("myFile.json", function(data){

               alert(data);

               myData = data; 

});

//   ---- This didn't work for same asynchronous reasons ---

alert(myData);

//Send the data to chart.js

var pieData = eval("[" + myData  + "']");

// Command to draw the chart onto screen. 

</script>

I know that, the $.get method is getting asynchronously, so pieData doesn't plot right. So, 

1. How do I make sure data is loaded and only then it is copied to pieData? and plotting takes place later. Thanks in advance, please give a simple example if possible.