Board Thread:Script Suggestions/@comment-24473195-20140918232302/@comment-11733175-20140919080707

Arkondi has the correct script, but it also uses highcharts (script). We didn't code the entire graph library ourselves :P

It's possible to use it elsewhere, although as I didn't write MediaWiki:Common.js/GECharts.js and haven't gone near it since it was written I'm not entirely sure how it all works off the top of my head. Essentially, we transclude price data on each item into the page, manipulate/format it a bit and pass it to the highcharts script. I believe highcharts is licensed to some degree, so do check before you use it on another site.