source: appstream-generator/contrib/setup/js_tmp/Flot/FAQ.md @ 4841

Last change on this file since 4841 was 4841, checked in by Juanma, 2 years ago

Initial release

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1## Frequently asked questions ##
2
3#### How much data can Flot cope with? ####
4
5Flot will happily draw everything you send to it so the answer
6depends on the browser. The excanvas emulation used for IE (built with
7VML) makes IE by far the slowest browser so be sure to test with that
8if IE users are in your target group (for large plots in IE, you can
9also check out Flashcanvas which may be faster).
10
111000 points is not a problem, but as soon as you start having more
12points than the pixel width, you should probably start thinking about
13downsampling/aggregation as this is near the resolution limit of the
14chart anyway. If you downsample server-side, you also save bandwidth.
15
16
17#### Flot isn't working when I'm using JSON data as source! ####
18
19Actually, Flot loves JSON data, you just got the format wrong.
20Double check that you're not inputting strings instead of numbers,
21like [["0", "-2.13"], ["5", "4.3"]]. This is most common mistake, and
22the error might not show up immediately because Javascript can do some
23conversion automatically.
24
25
26#### Can I export the graph? ####
27
28You can grab the image rendered by the canvas element used by Flot
29as a PNG or JPEG (remember to set a background). Note that it won't
30include anything not drawn in the canvas (such as the legend). And it
31doesn't work with excanvas which uses VML, but you could try
32Flashcanvas.
33
34
35#### The bars are all tiny in time mode? ####
36
37It's not really possible to determine the bar width automatically.
38So you have to set the width with the barWidth option which is NOT in
39pixels, but in the units of the x axis (or the y axis for horizontal
40bars). For time mode that's milliseconds so the default value of 1
41makes the bars 1 millisecond wide.
42
43
44#### Can I use Flot with libraries like Mootools or Prototype? ####
45
46Yes, Flot supports it out of the box and it's easy! Just use jQuery
47instead of $, e.g. call jQuery.plot instead of $.plot and use
48jQuery(something) instead of $(something). As a convenience, you can
49put in a DOM element for the graph placeholder where the examples and
50the API documentation are using jQuery objects.
51
52Depending on how you include jQuery, you may have to add one line of
53code to prevent jQuery from overwriting functions from the other
54libraries, see the documentation in jQuery ("Using jQuery with other
55libraries") for details.
56
57
58#### Flot doesn't work with [insert name of Javascript UI framework]! ####
59
60Flot is using standard HTML to make charts. If this is not working,
61it's probably because the framework you're using is doing something
62weird with the DOM or with the CSS that is interfering with Flot.
63
64A common problem is that there's display:none on a container until the
65user does something. Many tab widgets work this way, and there's
66nothing wrong with it - you just can't call Flot inside a display:none
67container as explained in the README so you need to hold off the Flot
68call until the container is actually displayed (or use
69visibility:hidden instead of display:none or move the container
70off-screen).
71
72If you find there's a specific thing we can do to Flot to help, feel
73free to submit a bug report. Otherwise, you're welcome to ask for help
74on the forum/mailing list, but please don't submit a bug report to
75Flot.
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