score:0

You need to load the file through an asynchronous request with d3.csv. Example code:

d3.csv("dataFile.csv", function(error, data) {
  // do something exciting with data
}

score:2

Your drawing code needs to stay inside csv callback:

d3.csv("testData.csv", function(data){
    // this converts data to number
    data.forEach(function(d) {
        d.x = +d.x;
        d.y = +d.y;
    });

    // rest of drawing code
    ...
});

See another example here:

http://vida.io/documents/QZZTrhk7SmfChczYp

It's easier to debug if you can post link to working code.


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