使用JavaScript将JSON Array文件转换为图形

Question

I am grabbing a JSON file from a server which has the following format:

[{"target": "carbon.agents.graphite01TimeTemp",
  "datapoints": 
    [  
       [0.00034302131648684774, 1395792060],
       [0.00041960148485072106, 1395792120],
       [0.00035245191970241269, 1395792180], 
       [0.00032920416076246247, 1395792240],
       ...
       [0.00034535436076246232, 1395792546]
    ]
}]

I am grabbing it using a node.js request using this library.

This is my full code:

var request = require('request');
request('###grabthejsondataurl###', function (error, response, body) {
    if (!error && response.statusCode == 200) {
        var returnval= JSON.parse(body);
            console.log(body);
        config.temp = returnval.datapoints;
        console.log(config.temp);
        job_callback(null, config);
    } 
})

The console.log(body) print out the JSON I displayed above.

But the console.log(config.temp) print out undefined .

Anybody understand why this is happening???

Extra Information:

The values on the left (0.0003342 etc) are temperatures and the values on the right (1395 etc) are the times.

The plan is to get all this data into an array in JavaScript then convert it into a graph.

Thanks for taking a look!

Answer 1

The data object is contained within an array. You can access it with: returnval[0].datapoints .

Try:

var request = require('request');
request('###grabthejsondataurl###', function (error, response, body) {
    if (!error && response.statusCode == 200) {
        var returnval= JSON.parse(body);
            console.log(body);
        config.temp = returnval[0].datapoints;
        console.log(config.temp);
        job_callback(null, config);
    } 
})