C3.js exclude columns from CSV

问题

I am creating a multiple series line graph with C3.JS by loading the data from a provided CSV file. I can plot the graph however I have not found yet if it is possible to only plot certain columns from the CSV, my graph is plotting all the CSV columns.

My CSV look like this:

Sex,Age,L,M,S,P3,P5,P10,P25,P50,P75,P90,P95,P97
2,0,-1.298749689,34.7115617,0.046905108,31.93019666,32.25089861,32.75948527,33.65186554,34.7115617,35.85124044,36.9534983,37.65137722,38.12110271
2,0.5,-1.440271514,36.03453876,0.042999604,33.38070525,33.68743507,34.17345861,35.02508397,36.03453876,37.11806755,38.16405088,38.82535049,39.27005698
2,1.5,-1.581016348,37.97671987,0.038067862,35.48627093,35.77560367,36.23325692,37.03281566,37.97671987,38.9853304,39.95458524,40.56517149,40.97482424
2,2.5,-1.593136386,39.3801263,0.035079612,36.98550023,37.26521982,37.70685493,38.47603153,39.3801263,40.34145495,41.2606303,41.83732218,42.22321458

And I which to only plot the lines for the percentiles (P* columns) columns with the Age as the X axis, and exclude the Sex, L, M and S columns from being plotted.

currently my graphs looks like this:

One solution is to remove the columns from the CSV file however this will not be possible as I will need the other values latter for other computations and I wish to keep all data in one file.

My C3.js code looks like this:

var chart = c3.generate({
    data: {
                x: 'Age',
        url: '/data/cdc/cdc_female_hcageinf.csv',
                type: 'line'

        },
    tooltip: {
        show: false
    },
            point: {
        show: false
    }
});

I am not sure if there is a c3.js configuration or method to do so, or a javascript method will be necessary.

回答1:

Inspired by @Armani I've ended up doing this, which is a combination of using d3.csv function with c3, as I didn´t find a way to do it with c3 URL.

First I used D3 to load the CSV file into a JSON object
Modify the data as required (not filtering)
Feed C3 with the json object
Use the "keys" property inside the c3 call to only show the fields I want.

d3.csv( _dataPath, function ( d ) {

  var data = d;

  if ( configdata.axis.x.source_units == "meses" && configdata.axis.x.units == "años" )
  {
    data[ configdata.axis.x.property_key ] = data[ configdata.axis.x.property_key ] / 12;
  }

  return data;

}, function( error, data ) {

  if (!error)
  {

    var percentiles = [];
    configdata.percentilesData.forEach( function( p ) {
      percentiles.push( p.name );
    });

    var x_axis_label = configdata.axis.x.label + ' (' + configdata.axis.x.units + ')';
    var y_axis_label = configdata.axis.y.label + ' (' + configdata.axis.y.units + ')';

    var chart = c3.generate({
      bindto: '#chart',
      data: {
        json: data,
        type: 'line',
        keys: {
          x: configdata.axis.x.property_key,
          value: percentiles
        }
      },
      axis: {
        y: {
          label: y_axis_label
        },
        x: {
          label: x_axis_label
        }
      },
      tooltip: {
        show: false
      },
      point: {
        show: false
      }
    });

  }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>

回答2:

you have to add a filter to your file's columns/keys

d3.csv("yourfile.csv", function(csv) {
 csv = csv.filter(function(key) { 
  return key != "Sex" && key != "L" && key != "M" && key != "S" ;
   }); 
 });

来源：https://stackoverflow.com/questions/26521945/c3-js-exclude-columns-from-csv

标签

javascript

d3.js

graph

c3.js