SVG Linecharts with Multiple Series
I've been trying to get multiple lines/series on a linechart. I have a query which works okay to get the first series. A slightly different query (or the same query, even) makes it barf and give me an error. I'm using HTMLDB 1.6
What's especially irritating is that there's next to no documentation for this thing. The manual and the how-tos give a couple small examples for various types of charts. It's never revealed anywhere what kind of query it's looking for in every type of chart, and the vague error messages and the neat-nonexistant documentation don't help in the slightest. Does anybody here really use this thing for actual development?
Sorry. Frustration aside, is there anybody who has managed to get this to work? I've been trying to get it to work for a few days now, as has a co-worker, and I'm getting nowhere. I might go and try it on my HTMLDB 2.0 demo account and see if maybe this kind of thing is fixed or at least better explained.
Message was edited by:
DanGrover
Dan,
I used line charts to show trends in report usage in an application I support. Basically the line chart can have multiple series (lines) on it. Each series has a unique query. All series queries are of the form:
SELECT link, label, value FROM table
- 'link' is an URL used for drill down. This could be another page in your application with a details report. When the user clicks on the line for the series, HTML DB takes a branch to this link.
- 'label' is the value for the x-axis. In my case this was a month of the year.
- 'value' is a numeric value to be plotted on the y-axis.
For example if you had a STOCK_QUOTES table the series query to track how Oracle's stock is doing would be:
SELECT NULL link, closing_date label, price value
FROM stocks
WHERE symbol = 'ORCL'
If you wanted to track other software companies stock on the same chart, just add another series changing the literal 'ORCL' to some other value.
Note: if you have more than 15 rows in your series query, make sure you increase the 'Maximum Rows' for the series to an appropriate value.
I hope this helps,
Mike
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