Estou tentando usar o widget de entrada de texto em um aplicativo brilhante para filtrar linhas em um quadro de dados, mas não consigo fazê-lo funcionar.

Conjunto de dados

df1<-data.frame (Name=c("Carlos","Pete","Carlos","Carlos","Carlos","Pete","Pete","Pete","Pete","Homer"),Sales=(as.integer(c("3","4","7","6","4","9","1","2","1","9"))))

UI

shinyUI(fluidPage(
titlePanel("Sales trends"),titlePanel("People score"),

sidebarLayout(sidebarPanel(

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

  numericInput("obs", "Number of observations to view:", 3),

  helpText("Note: while the data view will show only the specified",
           "number of observations, the summary will still be based",
           "on the full dataset."),

  submitButton("Update View")
),

mainPanel(
  h4("Volume: Total sales"),
  verbatimTextOutput("volume"),

  h4("Top people"),
  tableOutput("view")
))))

Servidor

library(shiny)
library (dplyr)
df1<-data.frame (Name=c("Carlos","Pete","Carlos","Carlos","Carlos","Pete","Pete","Pete","Pete","Homer"),Sales=(as.integer(c("3","4","7","6","4","9","1","2","1","9"))))
shinyServer(function(input, output) {
output$value <- renderPrint({ input$text })
datasetInput <- reactive({
switch(input$dataset,df1%>% filter(Name %in% "input$text")%>% select(Name, Sales)%>% arrange(desc(Sales)))
})
output$volume <- renderPrint({
dataset <- datasetInput()
sum(dataset$Sales)
})})