Tutorial by Topics: eval

First and foremost: know what you're doing! Secondly, while you should avoid using eval, if its use makes for cleaner code, go ahead.

Here is a way of having multiple value inside of a selector in order to filter a grid.

reactive, reactiveValue and eventReactive are various kinds of reactive expressions in Shiny. They yield output which can be used as input in other expressions, which will in turn take a dependency on the reactive expression. observe and observeEvent are similar to reactive expressions. The big dif...