Question

I am populating my Google chart using JSON currently, but I need to customize tooltips as well. Currently my JSON looks like this:

{
    "cols": [
        {"id": "", "label": "date", "type": "string"},
        {"id": "", "label": "price", "type": "number"}
    ],
    "rows": [
        {"c":[{"v": "Apr 24th","f":null}, {"v": 56000,"f":"56000"}]},
        {"c":[{"v": "May 3rd","f":null}, {"v": 68000,"f":"68000"}]},
        {"c":[{"v": "May 13th","f":null}, {"v": 50400,"f":"50400"}]}
    ]
}

But if I specify my tooltip in the JSON too like this:

{
    "cols": [
        {"id": "", "label": "Date", "type": "string"},
        {"id": "", "label": "price", "type": "number"},
        {"id": "", "role": "tooltip", "type": "string"}
    ],
    "rows": [
        {"c":[{"v": "Apr 24th","f":"null"}, {"v": 56000,"f":"56000"}, {"v": "24 April, Price - 56000, Seller-abcd"}]},
        {"c":[{"v": "May 3rd","f":"null"}, {"v": 68000,"f":"68000"}, {"v": "3 May, Price - 68000, Seller-abcd"}]},
        {"c":[{"v": "May 13th","f":"null"}, {"v": 50400,"f":"50400"}, {"v": "23 May, Price - 50000, Seller-abcd"}]}
    ]
}

I get an error that all values in series should be of same data type.

My client side code looks like this:

var jsonData = $.ajax({
    url: '../phps/testPhp.php',
    dataType:"json",
    async: false
}).responseText;

var dataTable = new google.visualization.DataTable(jsonData);

var minVal = 50000;
var maxVal = 70000;    

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

var options = {
    width: 375, height: 240,
    legend: 'none',
    pointSize: 5,
    backgroundColor: 'transparent',
    vAxis: { minValue: 45000, maxValue: 70000 }
};

chart.draw(dataTable, options);

Please let me know if someone knows the solution.

Answer 1

The tooltip column is badly defined; should be something like :

{"id": "", "role": "tooltip", "type": "string", "p" : { "role" : "tooltip" } }