javascript - d3.js - how to actualize the graph data? transition? -

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i trying learn d3.js (with no javascript background) created simple scatter plot.

now, looking how render graph random data, each time user click on next button.

in link above, there tried far.

i know it's newbie question , there thousands of example looking explained solution (not code). thanks

ps: please change external ressource this if graphs won't show up.


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