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shinyUI(navbarPage('Electoral College',

  # Create a tab panel for your map
  tabPanel('Map',
  
        titlePanel('Electoral College Votes'),
        
        # Create sidebar layout
        sidebarLayout(
          
          # Side panel for controls
          sidebarPanel(
            
            # Input to select variable to map
            selectInput('mapvar', label = 'Variable to Map', 
                        choices = list("Population" = 'population', 
                        'Electoral Votes' = 'votes'))),
                        
          
            # Main panel: display plotly map
            mainPanel(plotlyOutput('map')
          )
        )
    ), 
  
  # Create a tabPanel to show your scatter plot
  tabPanel('Scatter',
  
        # Add a titlePanel to your tab
        titlePanel('Population v.s. Vote Power'),
        
        # Create a sidebar layout for this tab (page)
        sidebarLayout(
          
          # Create a sidebarPanel for your controls
          sidebarPanel(
            
            # Make a textInput widget for searching for a state in your plot
            textInput('search', label="Find a State", value = '')),
          
            # Create a main panel, in which you should display your plot
            mainPanel(plotlyOutput('scatter')
          )
        )
    )
    
))

output$map <- renderPlotly({ 
    return(BuildMap(joined.data, input$mapvar))
    
    
    
output$distPlot <- renderPlot({
    x    <- faithful[, 2]  # Old Faithful Geyser data
    bins <- seq(min(x), max(x), length.out = input$bins + 1)
    
    # draw the histogram with the specified number of bins
    hist(x, breaks = bins, col = 'darkgray', border = 'white')
})



output$userText <- renderText({
    return(paste0('The user typed: ', input$text))
})



output$histogram <- renderPlot({
    x <- rnorm(1000)
    return(hist(x, col = input$color))
})
  

selectInput('mapvar', label = 'Variable to Map', choices = list("Population" =      
            'population', 'Electoral Votes' = 'votes')),
            
plotlyOutput('map')



plotOutput("distPlot")



textInput("text", label = h3("Text input"), value = "Enter text..."),

textOutput('userText')



radioButtons("color", label = "Color",
               choices = list("Green" = 'green', "Blue" = 'blue'), 
               selected = 'green'),
  
plotOutput('histogram')

SHINY

// take a string and convert to variable name

x <- 42
eval(parse(text = "x"))
[1] 42

// other way around

x <- 42
deparse(substitute(x))
[1] "x"