I have successfully coded several stacked column charts with no problem,
all having a similar structure shown in the snippet below:
arr.push(['Date', 'Item1', 'Item2', 'Item3', 'Item4', 'Item5']);
for (let i = 0; i < elementCount; i++)
{
arr.push
(
[
jsonData[i].date,
Number(jsonData[i].item1),
Number(jsonData[i].item2),
Number(jsonData[i].item3),
Number(jsonData[i].item4),
Number(jsonData[i].item5)
]
);
}
var data = new google.visualization.arrayToDataTable(arr);
When I execute the above code, I get several stacked columns (by date)
where each column is comprised of several stacks representing the values
associated with item1-item5 in the array. The item count is fixed and I
know the name of each item to be displayed in the legend in advance (i.e.
the chart has a legend showing "Item1", "Item2", ..., "Item5" as defined in
my initial *arr.push* statement. All good...
Now I am trying to do something seemingly very similar however I do not
know in advance the number or names of different items comprising any one
stacked column. The items are being read from a database and for one column
there may be only one "stack" item and for another there may be 5 "stack"
items.
I suspect I'm overthinking things here and I welcome anyone to point out
what should be obvious to me. Thanks in advance for any-and-all assistance.
Lloyd
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