Question

I have json data which contain the whole database record now i need to perform group by on this return json data with sorting on particular category.

I think sorting is easy to do on json data but i am not sure how i can go with group by. I need to group by on particular set of data.

Any help/suggestion would be great help.

Thanks
ravi

Answer 1

var obj = [{ "session":"1","page":"a"},
       { "session":"1","page":"b"},
       { "session":"1","page":"c"},
       { "session":"2","page":"d"},
       { "session":"2","page":"f"},
       { "session":"3","page":"a"}];

function GroupBy(myjson,attr){
    var sum ={};

    myjson.forEach( function(obj){
       if ( typeof sum[obj[attr]] == 'undefined') {
         sum[obj[attr]] = 1;
       }
       else {
         sum[obj[attr]]++;
       } 
    });
    return sum;
}

var result = GroupBy(obj,"page");

console.log("GroupBy:"+ JSON.stringify(result));
///  GroupBy(obj,"session")  --> GroupBy:{"1":3,"2":2,"3":1}
///  GroupBy(obj,"page")  --> GroupBy:{"a":2,"b":1,"c":1,"d":1,"f":1}