Create a password input control — passwordInput
R/input-password.R
  Description
Create an password control for entry of passwords.
Arguments
- inputId
 The
inputslot that will be used to access the value.- label
 Display label for the control, or
NULLfor no label.- value
 Initial value.
- width
 The width of the input, e.g.
'400px', or'100%'; seevalidateCssUnit().- placeholder
 A character string giving the user a hint as to what can be entered into the control. Internet Explorer 8 and 9 do not support this option.
Value
A text input control that can be added to a UI definition.
Server value
A character string of the password input. The default value is ""
unless value is provided.
See also
Other input elements: 
actionButton(),
checkboxGroupInput(),
checkboxInput(),
dateInput(),
dateRangeInput(),
fileInput(),
numericInput(),
radioButtons(),
selectInput(),
sliderInput(),
submitButton(),
textAreaInput(),
textInput(),
varSelectInput()
Examples
## Only run examples in interactive R sessions
if (interactive()) {
ui <- fluidPage(
  passwordInput("password", "Password:"),
  actionButton("go", "Go"),
  verbatimTextOutput("value")
)
server <- function(input, output) {
  output$value <- renderText({
    req(input$go)
    isolate(input$password)
  })
}
shinyApp(ui, server)
}