Cannot read property of undefined

Question

I'm looping my object data but am getting this undefined value.

Not sure why but was hoping some one can explain.

My object is like this:

//globally set var sdata = {"4":{"7":["1","7","3","3"]},"3":{"3":["2","8","1","1"]}};

And i loop the object like this:

function is_occupied(position) { for (var x in sdata) { for (var y in sdata) { // error's here Cannot read property '2' of undefined var ex = sdata[x][y][2] > position.block_width ? (sdata[x][y][2] + (sdata[x][y][2] - position.block_width)) : sdata[x][y][2], var ey = sdata[x][y][3] > position.block_height ? (sdata[x][y][3] + (sdata[x][y][3] - position.block_height)) : sdata[x][y][3]; if (position.x >= sdata[x][y][2] && position.x <= ex && position.y >= sdata[x][y][3] && position.y <= ey) { alert('hit'); } } } }

I'm wondering why it would say its undefined ? =/ Can't work it out. Its suppose to be getting position [2] in the array data of that object.

chrisn · Accepted Answer · 2012-04-06 02:22:48Z

6

I believe you want to be looping over sdata[x], not sdata in your inner loop:

function is_occupied(position) { for(var x in sdata){ for(var y in sdata[x]){

answered Apr 6, 2012 at 2:22

chrisn

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1 Comment

Sir Over a year ago

Ah ! Good spot Sir!! So it was! :)

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