Файл: admin/skins/lib/flot/FAQ.txt
Строк: 160
Frequently asked questions
--------------------------
Q: How much data can
Flot cope with?
A: Flot will happily draw everything you send to it so the
answer
depends on the browser. The excanvas emulation used for IE (built
with
VML) makes IE by far the slowest browser so be sure to test with
that
if IE users are in your target group.
1000 points is not a problem,
but as soon as you start having more
points than the pixel width, you
should probably start thinking about
downsampling/aggregation as this is
near the resolution limit of the
chart anyway. If you downsample
server-side, you also save bandwidth.
Q: Flot isn't working when I'm
using JSON data as source!
A: Actually, Flot loves JSON data, you just got
the format wrong.
Double check that you're not inputting strings instead of
numbers,
like [["0", "-2.13"], ["5",
"4.3"]]. This is most common mistake, and
the error might not
show up immediately because Javascript can do some
conversion
automatically.
Q: Can I export the graph?
A: This is a limitation of the
canvas technology. There's a hook in
the canvas object for getting an image
out, but you won't get the tick
labels. And it's not likely to be supported
by IE. At this point, your
best bet is probably taking a screenshot, e.g.
with PrtScn.
Q: The bars are all tiny in time mode?
A: It's not really
possible to determine the bar width automatically.
So you have to set the
width with the barWidth option which is NOT in
pixels, but in the units of
the x axis (or the y axis for horizontal
bars). For time mode that's
milliseconds so the default value of 1
makes the bars 1 millisecond
wide.
Q: Can I use Flot with libraries like Mootools or Prototype?
A:
Yes, Flot supports it out of the box and it's easy! Just use jQuery
instead
of $, e.g. call jQuery.plot instead of $.plot and use
jQuery(something)
instead of $(something). As a convenience, you can
put in a DOM element for
the graph placeholder where the examples and
the API documentation are
using jQuery objects.
Depending on how you include jQuery, you may have to
add one line of
code to prevent jQuery from overwriting functions from the
other
libraries, see the documentation in jQuery ("Using jQuery with
other
libraries") for details.
Q: Flot doesn't work with [insert
name of Javascript UI framework]!
A: The only non-standard thing used by
Flot is the canvas tag;
otherwise it is simply a series of absolute
positioned divs within the
placeholder tag you put in. If this is not
working, it's probably
because the framework you're using is doing
something weird with the
DOM, or you're using it the wrong way.
A common
problem is that there's display:none on a container until the
user does
something. Many tab widgets work this way, and there's
nothing wrong with
it - you just can't call Flot inside a display:none
container as explained
in the README so you need to hold off the Flot
call until the container is
actually displayed (or use
visibility:hidden instead of display:none or
move the container
off-screen).
If you find there's a specific thing we
can do to Flot to help, feel
free to submit a bug report. Otherwise, you're
welcome to ask for help
on the forum/mailing list, but please don't submit
a bug report to
Flot.