The option colors="['orange','blue','green','red']"
don't work because you plot only one yvar
. If you specify 4 colors, it's for 4 distincts yvar
.
Concerning the *Axis.gridlines.*
, I don't know why it doesn't work, but maybe because that for a Barchart the vAxis.gridlines
option is only supported for a continuous axis, and you have a discrete one (your data type is string).
(Barchart and not Columnchart because set orientation
to vertical
"rotates the axes of the chart so that (for instance) a column chart becomes a bar chart"
).
https://google-developers.appspot.com/chart/interactive/docs/gallery/barchart#Configuration_Options
Though the hAxis.gridlines
options should work because there is no restrictions on it...