Git.Storage.Web/Theme/plugins/flot/PLUGINS.txt

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Writing plugins
---------------

All you need to do to make a new plugin is creating an init function
and a set of options (if needed), stuffing it into an object and
putting it in the $.plot.plugins array. For example:

  function myCoolPluginInit(plot) {
    plot.coolstring = "Hello!";
  };

  $.plot.plugins.push({ init: myCoolPluginInit, options: { ... } });

  // if $.plot is called, it will return a plot object with the
  // attribute "coolstring"

Now, given that the plugin might run in many different places, it's
a good idea to avoid leaking names. The usual trick here is wrap the
above lines in an anonymous function which is called immediately, like
this: (function () { inner code ... })(). To make it even more robust
in case $ is not bound to jQuery but some other Javascript library, we
can write it as

  (function ($) {
    // plugin definition
    // ...
  })(jQuery);

There's a complete example below, but you should also check out the
plugins bundled with Flot.


Complete example
----------------
  
Here is a simple debug plugin which alerts each of the series in the
plot. It has a single option that control whether it is enabled and
how much info to output:

  (function ($) {
    function init(plot) {
      var debugLevel = 1;
    
      function checkDebugEnabled(plot, options) {
        if (options.debug) {
          debugLevel = options.debug;
            
          plot.hooks.processDatapoints.push(alertSeries);
        }
      }

      function alertSeries(plot, series, datapoints) {
        var msg = "series " + series.label;
        if (debugLevel > 1)
          msg += " with " + series.data.length + " points";
        alert(msg);
      }
    
      plot.hooks.processOptions.push(checkDebugEnabled);
    }