EVOLUTION-MANAGER

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<table width="100%" summary="page for updateSelectInput {shiny}"><tr><td>updateSelectInput {shiny}</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>Change the value of a select input on the client</h2>

<h3>Description</h3>

<p>Change the value of a select input on the client
</p>

<h3>Usage</h3>

<pre>
updateSelectInput(
  session,
  inputId,
  label = NULL,
  choices = NULL,
  selected = NULL
)

updateSelectizeInput(
  session,
  inputId,
  label = NULL,
  choices = NULL,
  selected = NULL,
  options = list(),
  server = FALSE
)

updateVarSelectInput(
  session,
  inputId,
  label = NULL,
  data = NULL,
  selected = NULL
)

updateVarSelectizeInput(
  session,
  inputId,
  label = NULL,
  data = NULL,
  selected = NULL,
  options = list(),
  server = FALSE
)
</pre>

<h3>Arguments</h3>

<table summary="R argblock">
<tr valign="top"><td><code>session</code></td>
<td>
<p>The <code>session</code> object passed to function given to
<code>shinyServer</code>.</p>
</td></tr>
<tr valign="top"><td><code>inputId</code></td>
<td>
<p>The id of the input object.</p>
</td></tr>
<tr valign="top"><td><code>label</code></td>
<td>
<p>The label to set for the input object.</p>
</td></tr>
<tr valign="top"><td><code>choices</code></td>
<td>
<p>List of values to select from. If elements of the list are
named, then that name &mdash; rather than the value &mdash; is displayed to the
user. It's also possible to group related inputs by providing a named list
whose elements are (either named or unnamed) lists, vectors, or factors. In
this case, the outermost names will be used as the group labels (leveraging
the <code style="white-space: pre;">&lt;optgroup&gt;</code> HTML tag) for the elements in the respective sublist. See
the example section for a small demo of this feature.</p>
</td></tr>
<tr valign="top"><td><code>selected</code></td>
<td>
<p>The initially selected value (or multiple values if <code>multiple = TRUE</code>). If not specified then defaults to the first value for
single-select lists and no values for multiple select lists.</p>
</td></tr>
<tr valign="top"><td><code>options</code></td>
<td>
<p>A list of options. See the documentation of <span class="pkg">selectize.js</span>
for possible options (character option values inside <code><a href="../../base/html/AsIs.html">base::I()</a></code> will
be treated as literal JavaScript code; see <code><a href="renderDataTable.html">renderDataTable()</a></code>
for details).</p>
</td></tr>
<tr valign="top"><td><code>server</code></td>
<td>
<p>whether to store <code>choices</code> on the server side, and load
the select options dynamically on searching, instead of writing all
<code>choices</code> into the page at once (i.e., only use the client-side
version of <span class="pkg">selectize.js</span>)</p>
</td></tr>
<tr valign="top"><td><code>data</code></td>
<td>
<p>A data frame. Used to retrieve the column names as choices for a <code><a href="selectInput.html">selectInput()</a></code></p>
</td></tr>
</table>

<h3>Details</h3>

<p>The input updater functions send a message to the client, telling it to
change the settings of an input object. The messages are collected and sent
after all the observers (including outputs) have finished running.
</p>
<p>The syntax of these functions is similar to the functions that created the
inputs in the first place. For example, <code><a href="numericInput.html">numericInput</a>()</code> and
<code>updateNumericInput()</code> take a similar set of arguments.
</p>
<p>Any arguments with NULL values will be ignored; they will not result in any
changes to the input object on the client.
</p>
<p>For <code><a href="radioButtons.html">radioButtons</a>()</code>, <code><a href="checkboxGroupInput.html">checkboxGroupInput</a>()</code> and
<code><a href="selectInput.html">selectInput</a>()</code>, the set of choices can be cleared by using
<code>choices=character(0)</code>. Similarly, for these inputs, the selected item
can be cleared by using <code>selected=character(0)</code>.
</p>

<p><code><a href="selectInput.html">selectInput()</a></code> <code><a href="varSelectInput.html">varSelectInput()</a></code>
</p>

<h3>Examples</h3>

<pre>
## Only run examples in interactive R sessions
if (interactive()) {

ui &lt;- fluidPage(
  p("The checkbox group controls the select input"),
  checkboxGroupInput("inCheckboxGroup", "Input checkbox",
    c("Item A", "Item B", "Item C")),
  selectInput("inSelect", "Select input",
    c("Item A", "Item B", "Item C"))
)

server &lt;- function(input, output, session) {
  observe({
    x &lt;- input$inCheckboxGroup

# Can use character(0) to remove all choices
    if (is.null(x))
      x &lt;- character(0)

# Can also set the label and select items
    updateSelectInput(session, "inSelect",
      label = paste("Select input label", length(x)),
      choices = x,
      selected = tail(x, 1)
    )
  })
}

shinyApp(ui, server)
}
</pre>

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