Check()

Perform a soft-check to see if a dependency is available...

Syntax

var available = Check(file, ver);

Parameters

Parameter

Type

Mandatory

Notes

API Version

file

String

Array of String

The name of the file to check, or an array of file names.

Must match the value of the 'file' property specified in the Self Descriptor Object of the file you want to check.

If an array is passed in, all files will be checked for the same ver (if specified).

1.0

ver

Number

Constant

The version of the dependency, or one of the following constants:

Check.ANY_VERSION – ignore version check
Check.NOT_LOADED – fail check if file(s) already loaded

Default: Check.ANY_VERSION

1.0

Return values

Value	Type	Notes	API Version
`true`	Boolean	The specified requirements were met	1.0
`false`	Boolean	One or more of the specified requirements was not met	1.0

Notes

This function is similar to Check.has() with some notable differences:

Check() allows an array of filenames in the first parameter, Check.has() does not
Check() does not attempt to autoload missing files, Check.has() does (unless told not to)

Example

if (Check("foo.js")) {
  // do stuff that relies on foo.js (any version)
}
 
if (Check(["bar.js", "baz.js"], 1.2)) {
  // do stuff that requires v1.2 of bar.js and v1.2 of baz.js
}
 
if (Check("foo.js", Check.NOT_LOADED)) {
  // do stuff that relies on foo.js being unavailable
}