Join multiple DataTables (to make a chart with multiple lines)

[Milan Slesarik]

Hello guys,

I'm trying to create a function which creates a Chart from a JSON. The keys in this JSON are "lines". 

So function creates a multiple DataTables and then, it tries to join them and create a Chart. The problem is that it acts like it joins the first and last table because I see there only 2 lines.

Here is a working snippet: JSFiddle snippet > http://jsfiddle.net/milanoo/XF7JE/382/

As you can see there are multiple keys (shops) in the JSON but only the first and last one are shown on a graph. 

JOIN SNIPPET from my code where datas is an array of DataTables:

var joinedData = datas[0];
$.each(datas, function (index, data1) {
    console.log('joining index '+index)
    if (index != 0) {
        joinedData = google.visualization.data.join(joinedData, data1, 'full', [[0, 0]], [1], [1]);
    }
});

Do you know what should I do to draw all lines?