score:0
jquery has a built in ajax method that you may find useful.
$.get("http://remote-server.com/my_script.php" [, data ] [, success ] [, datatype ] )
you can pass variables to your server script via the data parameter. when your server returns data, you can decide how to act on it with a callback function.
score:1
the best option is communicate with the server via json. so you catch event on the dropdown, call $.getjson() to your server, returning json data, which can be used in the chart.
functions to manipulate on chart: - setdata - addpoint - series.update
all of them are documented here
Source: stackoverflow.com
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