使用Google GeoChart显示西非

Question

I'd like to display a worldmap (GeoChart) using Google's Chart API where some countries are listed by country and others are displayed based on a grouping/region.

My data might look like this:

[["Country","DataValue"],["United States",2000],["West Africa",3000],["Great Britain",1500]];

Is this possible to do? I tried playing with the displayMode property of the options but that didn't do any good. I also tried using "011" instead of "West Africa" since "011" is recognized as a region by the API. That did not work either.

I was able to display just the region of West Africa with the region option but that isn't what I'm after. I really want to display the world but have regions like West Africa handled and colored as a group rather than individual countries.

Thanks for your help.

Answer 1

Google Geochart supports either the whole world or specific region (eg 011 Western Africa )

Since your goal:

to display the world but have regions like West Africa handled and colored as a group rather than individual countries

i would propose the following solution: to dynamically expand data table row for a region into the rows per every country from that region:

function expandRegions(dataTable) {
    var regions = {
        'West Africa': {
            '204': 'Benin',
            '854': 'Burkina Faso',
            '132': 'Cabo Verde',
            '384': "Cote d'Ivoire",
            '270': 'Gambia',
            '288': 'Ghana',
            '324': 'Guinea',
            '624': 'Guinea-Bissau',
            '430': 'Liberia',
            '466': 'Mali',
            '478': 'Mauritania',
            '562': 'Niger',
            '566': 'Nigeria',
            '654': 'Saint Helena',
            '686': 'Senegal',
            '694': 'Sierra Leone',
            '768': 'Togo'
        }
    };


    for (var i = 0; i < dataTable.getNumberOfRows(); i++) {
        var regionName = dataTable.getValue(i, 0);
        var region = regions[regionName];
        if (region) {
            var value = dataTable.getValue(i, 1);
            dataTable.removeRow(i); //remove region row
            //add countries from region rows 
            for (var code in region) {
                var countryName = region[code];
                dataTable.addRow([countryName, value]);
            }
        }
    }
    return dataTable;
}

Complete example

 google.load("visualization", "1", { packages: ["geochart"] }); google.setOnLoadCallback(drawRegionsMap); function drawRegionsMap() { var data = google.visualization.arrayToDataTable([ ["Country","DataValue"], ["United States",2000], ["West Africa",3000], ["Great Britain",1500] ]); data = expandRegions(data); var options = { }; var chart = new google.visualization.GeoChart(document.getElementById('regions_div')); chart.draw(data, options); } function expandRegions(dataTable) { var regions = { 'West Africa': { '204': 'Benin', '854': 'Burkina Faso', '132': 'Cabo Verde', '384': "Cote d'Ivoire", '270': 'Gambia', '288': 'Ghana', '324': 'Guinea', '624': 'Guinea-Bissau', '430': 'Liberia', '466': 'Mali', '478': 'Mauritania', '562': 'Niger', '566': 'Nigeria', '654': 'Saint Helena', '686': 'Senegal', '694': 'Sierra Leone', '768': 'Togo' } }; for (var i = 0; i < dataTable.getNumberOfRows(); i++) { var regionName = dataTable.getValue(i, 0); var region = regions[regionName]; if (region) { var value = dataTable.getValue(i, 1); dataTable.removeRow(i); for (var code in region) { var countryName = region[code]; dataTable.addRow([countryName, value]); } } } return dataTable; } 

 <script type="text/javascript" src="https://www.google.com/jsapi"></script> <div id="regions_div" style="width: 900px; height: 500px;"></div>