Why does legend not appear when the first bar value is zero?

Question

I have created a chart using Forena reports. I have added the legend by using the property frx:legend_entries="legend" from the frx file. But when value of the first bar chart is zero or null, legend is not visible.

I am attaching the pictures below.

Answer 1

I would check the results you'd get by using either of these special settings in the SVG Graph library:

• Use the (boolean) force_associate option.
• Set the axis_min_v option to something like -1.

If none of these options help, you might have discovered "some issue" (bug?) in the SVG Graph library.

A possible work around might also be that you can think of a way to replace the "zero or null" with "NULL".