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82 lines
2.7 KiB
Plaintext
82 lines
2.7 KiB
Plaintext
About
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-----
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Flot is a Javascript plotting library for jQuery. Read more at the
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website:
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http://code.google.com/p/flot/
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Take a look at the examples linked from above, they should give a good
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impression of what Flot can do and the source code of the examples is
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probably the fastest way to learn how to use Flot.
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Installation
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------------
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Just include the Javascript file after you've included jQuery.
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Note that you need to get a version of Excanvas (e.g. the one bundled
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with Flot) which is canvas emulation on Internet Explorer. You can
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include the excanvas script like this:
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<!--[if IE]><script language="javascript" type="text/javascript" src="excanvas.pack.js"></script><![endif]-->
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If it's not working on your development IE 6.0, check that it has
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support for VML which excanvas is relying on. It appears that some
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stripped down versions used for test environments on virtual machines
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lack the VML support.
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Also note that you need at least jQuery 1.2.6 (but at least jQuery
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1.3.2 is recommended for interactive charts because of performance
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improvements in event handling).
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Basic usage
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-----------
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Create a placeholder div to put the graph in:
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<div id="placeholder"></div>
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You need to set the width and height of this div, otherwise the plot
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library doesn't know how to scale the graph. You can do it inline like
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this:
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<div id="placeholder" style="width:600px;height:300px"></div>
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You can also do it with an external stylesheet. Make sure that the
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placeholder isn't within something with a display:none CSS property -
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in that case, Flot has trouble measuring label dimensions which
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results in garbled looks and might have trouble measuring the
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placeholder dimensions which is fatal (it'll throw an exception).
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Then when the div is ready in the DOM, which is usually on document
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ready, run the plot function:
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$.plot($("#placeholder"), data, options);
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Here, data is an array of data series and options is an object with
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settings if you want to customize the plot. Take a look at the
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examples for some ideas of what to put in or look at the reference
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in the file "API.txt". Here's a quick example that'll draw a line from
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(0, 0) to (1, 1):
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$.plot($("#placeholder"), [ [[0, 0], [1, 1]] ], { yaxis: { max: 1 } });
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The plot function immediately draws the chart and then returns a plot
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object with a couple of methods.
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What's with the name?
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---------------------
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First: it's pronounced with a short o, like "plot". Not like "flawed".
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So "Flot" rhymes with "plot".
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And if you look up "flot" in a Danish-to-English dictionary, some up
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the words that come up are "good-looking", "attractive", "stylish",
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"smart", "impressive", "extravagant". One of the main goals with Flot
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is pretty looks.
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