Check.has()

Check if a dependency is available, try and load it if not, return availability state...

Syntax

var available = Check.has(file[, ver[, lazy]])

Parameter

Type

Mandatory

Notes

Util.js version

file

String

Filename of dependency

1.0

ver

Number

Constant

Specify the required version of the file (exact match) or a version constant:

Check.ANY_VERSION – skip version check
Check.NOT_LOADED – disables autoloading of the file, fails dependency check if the file is already loaded

Default: Check.ANY_VERSION

For more information on autolaoding, see: Check.paths[].

1.0

lazy

Constant

By default, Check.has() will attempt to autoload missing dependencies.

If you want to prevent autoloading, specify Check.LAZY_LOAD

1.0

Value	Type	Notes	Util.js version
true	Boolean	The dependency check was successful.	1.0
false	Boolean	The dependency check failed.	1.0
<error>	Error	An error occurred, most likely invalid parameters.	1.0

function bleh() {
  if (Check.has("foo.js", 1.2)) {
    // do it the foo.js v1.2 way
  } else {
    // do it without any foo
  }
}

function bleh() {
  if (Check.has("foo.js", 1.2, Check.LAZY_LOAD)) {
    // do it the foo.js v1.2 way
  } else {
    // do it without any foo
  }
}

You can get a list of all provided dependencies using Util API diagnostics (requires Diag API).