You can process the JSON in the Javascript to build the data required for the chart as shown below:
var jsonFromServer = [
{
"Score": "84",
"Trainer": "Jamshaid",
"Subject Name": "Java"
},
{
"Score": "50",
"Trainer": "Zaid",
"Subject Name": "Android"
},
{
"Score": "40",
"Trainer": "Sajjad",
"Subject Name": "iOS"
},
{
"Score": "50",
"Trainer": "Jamshaid",
"Subject Name": "iOS"
}
];
The above is data from server captured in a variable
The below code helps you to extract the Y axis Values (i.e the unique subject names) from the JSON response:
function getSubjects(){
var subjectsMap = {};
$.each(jsonFromServer, function(index, value){
if(!subjectsMap[value['Subject Name']]){
subjectsMap[value['Subject Name']] = 1;
}
});
return $.map(subjectsMap, function(index, val){ return val; });
}
Then we need to extract the Scores for each trainer in different subject which should be of form: [{name: "Trainer", data: []}] where data is an array of scores in subject whose order should be same as the order of subjects appearing in the Y axis data. Which can be achieved using the below code:
function getTrainers(){
var trainersMap = {};
$.each(jsonFromServer, function(index, value){
if(!trainersMap[value['Trainer']]){
trainersMap[value['Trainer']] = 1;
}
});
return $.map(trainersMap, function(index, val){ return val; });
}
function getMarks(){
var subjects = getSubjects();
var trainers= getTrainers();
var marks = {};
//initialize the trainers scores in all subjects to 0
$.each(trainers, function(index, trainer){
if ( !marks[trainer]){
marks[trainer] = {};
}
$.each(subjects, function(idx2, sub){
marks[trainer][sub] = 0;
});
});
//now populate with the actual values obtained from server
$.each(subjects, function(idx2, sub){
$.each(jsonFromServer, function(index, value){
var trainer = value['Trainer'];
var subName = value['Subject Name'];
var score = value['Score'];
if ( sub == subName){
marks[trainer][sub] = score;
}
});
});
//now format the marks object into the format required for highcharts
//i.e an array of object with properties [{name: "", data:[]}]
return $.map(marks, function(val, index){
var scoreArray = [];
$.each(val, function(index, score){
scoreArray.push(parseInt(score));
});
return {"name": index, "data": scoreArray};
});
}
The working code can be found in the fiddle here.
