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Parameter Reloading in RMarkdown

Thomas Williams wants to improve the user experience:

Recently I needed to reload a parameter, without reloading the page. The parameter was bound to a data frame, where end-users selected a value and then I looked up other fields in the data frame further down the page (for example, a name was selected, but I wanted the identifier from the same record). It wasn’t exactly intuitive, so here’s how I did it.

Click through for code and explanation.