Description
The above example shows you how to create `LineChart` using ChartJs package. In this example, for purpose of chart demonstration only, we do use mock-up data from array. As you can see, the KoolReport's widget in general support dataSource could be DataStore, Process, DataSource or even simple array.
This example shows how to build a line chart using callback to sum values with same column.
For example:
...
"tooltips" => array(
...
"callbacks" => array(
"footer" => "function(tooltipItems, data){
var sum = 0;
tooltipItems.forEach(function(tooltipItem){
sum += data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
});
return 'Sum: ' + sum;
}"
)
)
...