CODEWITHSUNDEEP
javascriptchartsgoogle-sheetsgoogle-visualization
user3344449
user3344449

Reputation: 41

Pulling Google Sheets as data source for Google Gantt Chart

I'm attempting to pull data from Google Sheets and use it as a source for my Gantt chart. I've followed the example in the Google Charts documentation for pulling Sheets data for a columnchart, but not sure if more customization is necessary.

I'm not as familiar with Javascript, so not sure what is triggering the error. Here is the code in JSFiddle.

google.charts.load('current', {'packages':['gantt']});
google.charts.setOnLoadCallback(drawChart);

function daystoMilliseconds(days) {
  return days * 24 * 60 * 60 * 1000;
}

function drawGID() {
  var queryString = encodeURIComponent('SELECT A, B, C, D, E, F, G, H');

  var query = new google.visualization.Query(
      'https://docs.google.com/spreadsheets/d/1f0wxDrEfptRKCRY5pQPu6Dc_ue_tIX_ja5pQO3vXjOY/edit#gid=0&headers=1&tq=' + queryString);
  query.send(handleSampleDataQueryResponse);
}

function handleSampleDataQueryResponse(response) {
  if (response.isError()) {
    alert('Error in query: ' + response.getMessage() + ' ' + response.getDetailedMessage());
    return;
  }}

function drawChart() {

  var otherData = response.getDataTable();

  var options = {
    height: 275,
    gantt: {
      defaultStartDateMillis: new Date(2015, 3, 28)
    }
  };

  var chart = new google.visualization.Gantt(document.getElementById('chart_div'));

  chart.draw(otherData, options);
}

Upvotes: 0

Views: 1398

Answers (2)

David Miguel
David Miguel

Reputation: 14480

The following Google project allows you to view a Google Spreadsheet as a Gantt Chart: https://github.com/google/ezgantt

enter image description here

Upvotes: 1

WhiteHat
WhiteHat

Reputation: 61285

first, the callback should be --> drawGID

instead of --> drawChart

next, notice the data format for a Gantt chart

both the 'Start' and 'End' dates are required and cannot be blank,
as in the spreadsheet

see following working snippet...

a new data table is built, using the data from the spreadsheet (otherData),
using the 'Duration' column to fill in the the dates 

google.charts.load('current', {
  callback: drawGID,
  packages: ['gantt']
});

function drawGID() {
  var queryString = encodeURIComponent('SELECT A, B, C, D, E, F, G, H');

  var query = new google.visualization.Query(
      'https://docs.google.com/spreadsheets/d/1f0wxDrEfptRKCRY5pQPu6Dc_ue_tIX_ja5pQO3vXjOY/edit#gid=0&headers=1&tq=' + queryString);
  query.send(handleSampleDataQueryResponse);
}

function handleSampleDataQueryResponse(response) {
  if (response.isError()) {
    alert('Error in query: ' + response.getMessage() + ' ' + response.getDetailedMessage());
    return;
  }

  var otherData = response.getDataTable();
  var ganttData = new google.visualization.DataTable({cols: [
    {type: 'string', label: 'Task Id'},
    {type: 'string', label: 'Task Name'},
    {type: 'string', label: 'Resource'},
    {type: 'date', label: 'Start'},
    {type: 'date', label: 'End'},
    {type: 'number', label: 'Duration'},
    {type: 'number', label: '% Complete'},
    {type: 'string', label: 'Dependencies'}
  ]});

  var duration = 0;
  var startDate = new Date(2016, 0, 1);
  var endDate;
  for (var i = 0; i < otherData.getNumberOfRows(); i++) {
    startDate = new Date(startDate.getTime() + duration);
    duration += otherData.getValue(i, 5);
    endDate = new Date(startDate.getTime() + duration);
    ganttData.addRow([
      otherData.getValue(i, 0),
      otherData.getValue(i, 1),
      otherData.getValue(i, 2),
      startDate,
      endDate,
      otherData.getValue(i, 5),
      parseFloat(otherData.getValue(i, 6)),
      otherData.getValue(i, 7)
    ]);
  }

  var options = {
    height: 275,
    gantt: {
      defaultStartDateMillis: new Date(2015, 3, 28)
    }
  };

  var chart = new google.visualization.Gantt(document.getElementById('chart_div'));
  chart.draw(ganttData, options);
}
<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="chart_div"></div>

Upvotes: 1

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