R: Namespaced IDs for inputs/outputs

NS {shiny} | R Documentation

## Namespaced IDs for inputs/outputs

### Description

The `NS` function creates namespaced IDs out of bare IDs, by joining them using `ns.sep` as the delimiter. It is intended for use in Shiny modules. See http://shiny.rstudio.com/articles/modules.html.

### Usage

    NS(namespace, id = NULL)

    ns.sep

### Arguments

`namespace` | The character vector to use for the namespace. This can have any length, though a single element is most common. Length 0 will cause the `id` to be returned without a namespace, and length 2 will be interpreted as multiple namespaces, in increasing order of specificity (i.e. starting with the top-level namespace).
`id` | The id string to be namespaced (optional).

### Format

An object of class `character` of length 1.

### Details

Shiny applications use IDs to identify inputs and outputs. These IDs must be unique within an application, as accidentally using the same input/output ID more than once will result in unexpected behavior. The traditional solution for preventing name collisions is namespaces; a namespace is to an ID as a directory is to a file. Use the `NS` function to turn a bare ID into a namespaced one, by combining them with `ns.sep` in between.

### Value

If `id` is missing, returns a function that expects an id string as its only argument and returns that id with the namespace prepended.

### See Also

http://shiny.rstudio.com/articles/modules.html

[Package shiny version 1.0.5 Index]