Javascript数组查询

Question

I am using highcharts.js to plot a simple column graph using my json data, I have done this before but now I'm plotting with a slightly different dataset (filtered and different format)

For "processed_json", idea used : http://codeinjs.blogspot.com/2013/07/preprocess-json-data-to-use-in.html

Currently, my processed_json is :

function plotgraph1(filter1)
        {
            var processed_json = new Array();

            $j.map(filter1, function(obj, i) {
             processed_json.push(obj[0], obj[1]);
             console.log(processed_json)    

            }); 
...................
         }

Console prints :

["2014-06-14T18:30:00Z", 4044,
 "2014-06-15T18:30:00Z", 5030,
 "2014-06-16T18:30:00Z", 4913,
 "2014-06-17T18:30:00Z", 4985,
 "2014-06-18T18:30:00Z", 4778,
 "2014-06-19T18:30:00Z", 4733,
 "2014-06-20T18:30:00Z", 3960,
 "2014-06-21T18:30:00Z", 4221,  .......]

Opening up gives :

0: "2014-06-14T18:30:00Z"
1: 4044
2: "2014-06-15T18:30:00Z"
3: 5030
4: "2014-06-16T18:30:00Z"
5: 4913

.......... and so on

It is storing the date1, metric1 and so on, but I want it to store it in different arrays. Basically, it should be an array of arrays, for each day, a separate array. So that highcharts.js can read it properly. Now it's reading the data but, since all dates are in one array it's skipping a date and showing 28 dates instead of 14 days (which is the selected range); (double basically)

Earlier and correct "processed_json" is :

[Array[2], Array[2], Array[2], Array[2], Array[2], Array[2], Array[2], Array[2], Array[2], Array[2], Array[2], Array[2], Array[2], Array[2]]
0: Array[2]
0: "2014-04-30T18:30:00Z"
1: 200303

I was trying something like this :

var processed_json1 = [];
            for ( var i = 0; i < processed_json.length; i++)
            {
            processed_json1.push(processed_json[i]);
            }

But, clearly this is wrong and I am wasting too much time. Any good direction/suggestion will be highly appreciated to convert my data format to the correct one for highcharts to read it properly.

Answer 1

Giving multiple arguments to push is just short for calling push separately with each argument, it doesn't collect them together in an array. You need to make them an object first:

function plotgraph1(filter1)
{
    var processed_json = $j.each(filter1, function(i, obj) {
        processed_json.push([obj[0], obj[1]]);  

    }); 
    console.log(processed_json)
    ...................
}

DEMO

Answer 2

I think you are looking for something like the following:

            var array = [];
        for(var i=0;i<5;i++){
            array.push({"date":"metric"});
        }
        console.log(array);

Outputs:

[Object, Object, Object, Object, Object]
0: Object
date: "metric"
1: Object
date: "metric"
2: Object

Answer 3

processed_json.reduce(function(soFar, val, idx) {
    if (idx % 2 == 0) {soFar.push([]);} 
    soFar[soFar.length - 1].push(val); 
    return soFar;
}, []); 
//=> [["2014-06-14T18:30:00Z", 4044], ["2014-06-15T18:30:00Z", 5030], ...]

Is that what you're looking for?