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76 lines
3.2 KiB
Markdown
76 lines
3.2 KiB
Markdown
11 years ago
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## Frequently asked questions ##
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#### How much data can Flot cope with? ####
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Flot will happily draw everything you send to it so the answer
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depends on the browser. The excanvas emulation used for IE (built with
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VML) makes IE by far the slowest browser so be sure to test with that
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if IE users are in your target group (for large plots in IE, you can
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also check out Flashcanvas which may be faster).
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1000 points is not a problem, but as soon as you start having more
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points than the pixel width, you should probably start thinking about
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downsampling/aggregation as this is near the resolution limit of the
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chart anyway. If you downsample server-side, you also save bandwidth.
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#### Flot isn't working when I'm using JSON data as source! ####
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Actually, Flot loves JSON data, you just got the format wrong.
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Double check that you're not inputting strings instead of numbers,
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like [["0", "-2.13"], ["5", "4.3"]]. This is most common mistake, and
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the error might not show up immediately because Javascript can do some
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conversion automatically.
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#### Can I export the graph? ####
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You can grab the image rendered by the canvas element used by Flot
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as a PNG or JPEG (remember to set a background). Note that it won't
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include anything not drawn in the canvas (such as the legend). And it
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doesn't work with excanvas which uses VML, but you could try
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Flashcanvas.
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#### The bars are all tiny in time mode? ####
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It's not really possible to determine the bar width automatically.
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So you have to set the width with the barWidth option which is NOT in
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pixels, but in the units of the x axis (or the y axis for horizontal
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bars). For time mode that's milliseconds so the default value of 1
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makes the bars 1 millisecond wide.
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#### Can I use Flot with libraries like Mootools or Prototype? ####
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Yes, Flot supports it out of the box and it's easy! Just use jQuery
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instead of $, e.g. call jQuery.plot instead of $.plot and use
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jQuery(something) instead of $(something). As a convenience, you can
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put in a DOM element for the graph placeholder where the examples and
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the API documentation are using jQuery objects.
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Depending on how you include jQuery, you may have to add one line of
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code to prevent jQuery from overwriting functions from the other
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libraries, see the documentation in jQuery ("Using jQuery with other
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libraries") for details.
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#### Flot doesn't work with [insert name of Javascript UI framework]! ####
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Flot is using standard HTML to make charts. If this is not working,
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it's probably because the framework you're using is doing something
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weird with the DOM or with the CSS that is interfering with Flot.
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A common problem is that there's display:none on a container until the
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user does something. Many tab widgets work this way, and there's
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nothing wrong with it - you just can't call Flot inside a display:none
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container as explained in the README so you need to hold off the Flot
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call until the container is actually displayed (or use
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visibility:hidden instead of display:none or move the container
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off-screen).
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If you find there's a specific thing we can do to Flot to help, feel
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free to submit a bug report. Otherwise, you're welcome to ask for help
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on the forum/mailing list, but please don't submit a bug report to
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Flot.
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