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this is an array of objects,

    var data = [{"label" : "1",  "value" : 12},
{"label" : "1", "value" : 12 },
{"label" : "1", "value" : 12},
{"label" : "1", "value" : 12}];

how can i add values to these dynamically? i tried the below code but no success

var lab=["1","2","3", "4"];
var val= [42,55,51,22];
var data =new Array();
    for(var i=0; i<4; i++)  {
       data[i].label= lab[i];
       data[i].value=val[i];    }

anyone please.. thanks in advance

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You know that there are 3x lab and 4x val? – xanatos Oct 22 '11 at 9:25
yes i know, its only here mistakenly.. thanks for informing me – ABC Oct 22 '11 at 9:37

1 Answer

up vote 2 down vote accepted

You have to instantiate the object first. The simplest way is:

var lab =["1","2","3"];
var val = [42,55,51,22];
var data = [];
for(var i=0; i<4; i++)  {
    data.push({label: lab[i], value: val[i]});
}

Or an other, less concise way, but closer to your original code:

for(var i=0; i<4; i++)  {
   data[i] = {};              // creates a new object
   data[i].label = lab[i];
   data[i].value = val[i];    
}

array() will not create a new array (unless you defined that function). Either Array() or new Array() or just [].

I recommend to read the MDN JavaScript Guide.

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