如何将JavaScript对象传递给另一个函数？

Question

I am downloading csv file from AWS S3 bucket so that I can use it in D3.

No problem downloading the csv file. In code below the console.log(data.Body.toString()) prints out the csv file contents in expected format

However, I am not sure how to pass the downloaded csv file content to D3 in code below.

The file contents are already in nice csv file format.

Question: how to replace merged.csv below with the mergedcsv object?

<script type="text/javascript">

var bucket = new AWS.S3();

bucket.getObject({
    Bucket: 's3-google-analytics', 
    Key: 'merged.csv'
}, 
    function awsDataFile(error, data) {
        if (error) {
            return console.log(error);
        }
        mergedcsv = data.Body.toString();
        console.log(data.Body.toString());
    }
);

// how to replace the "merged.csv" below with the mergedcsv object above?

d3.csv("merged.csv", function(data) {
    var parseDate = d3.time.format("%Y%m%d").parse;
    var counter = 0;
    data.forEach(function(d) {
        etc
    });
});

</script>

updated to add sample of mergedcsv content eg output of console.log(mergedcsv); or console.log(data.Body.toString()); :

yyyymm,date,hostname,source,PPCC,in30days,sessionDuration,users,sessions,newUsers,twitterSessions,bounceRate,sessionsPerUser
201203,20120330,journal,google,PPCC,>30days,26.25,4,4,4,0,75.0,1.0
201203,20120331,journal,(direct),PPCC,>30days,0.0,3,3,3,0,100.0,1.0
201203,20120331,journal,bing,PPCC,>30days,0.0,1,1,1,0,100.0,1.0

Answer 1

After reading a the docs on d3.csv, it loads a CSV file from a URL, but in your example, you've already loaded the data, you just need to parse it. So d3.csv isn't going to be of any use.

It looks like the D3 function for parsing is d3.csv.parse(data) which will return an array of parsed data. (Docs are here )

So you could do something like…

var bucket = new AWS.S3();
var mergedcsv;

bucket.getObject({
    Bucket: 's3-google-analytics', 
    Key: 'merged.csv'
}, 
    function awsDataFile(error, data) {
        if (error) {
            return console.log(error);
        }
        mergedcsv = d3.csv.parse(data.Body.toString()); 

        // now mergedcsv will be an array, so you can do whatever you were going to do with it before, i.e...
        var parseDate = d3.time.format("%Y%m%d").parse;
        var counter = 0;
        data.forEach(function(d) {
           etc
        });
    }
);