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Excerpt

Returns true Check if a dependency is available, otherwise falsetry and load it if not, return availability state...

 

Syntax

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if (uHas(filevar available = Check.has(file[, ver)) {
  // do something that needs that file
} else {
  // do it a different way
}[, lazy]])

Parameters

ParameterTypeMandatoryNotesUtil.js version
fileString(tick)Filename of dependency1.0.8
ver

Number

(error)

Minimum version of that file

0.8

Constant

(error)

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

Default: Check.ANY_VERSION

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

1.0
lazyConstant(error)

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

If you want to prevent autoloading, specify Check.LAZY_LOAD

1.0

Return Values

ValueTypeNotesUtil.js version
trueBooleanIndicates the file (and optionally version) are available.0.8The dependency check was successful.1.0
falseBoolean

Either:

  • The specified filename is not available
  • The specified version of that file is not present
0.8

The dependency check failed.

1.0
<error>ErrorSomething unexpected happenedAn error occurred, most likely invalid parameters.0.8<object>ObjectObject with named properties (file names) and numeric values (versions) of all provided libraries. See "Notes" below for more information. 1.0

Example

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titleUsing different approaches based on available dependencyCheck specific version of file...
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function bleh() {
  if (uHasCheck.has("foo.js",0 1.32)) {
    // do it the foo.js v0.3 or higher wayv1.2 way
  } else {
    // do it without any foo
  }
else}
Code Block
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languagejavascript
titlePrevent autoloading foo.js...
linenumberstrue
function bleh() {
  if (uHasCheck.has("foo.js", 1.2, Check.LAZY_LOAD)) {
    // do it the foo.js v0v1.2 or earlier way
  } else {
    // do it without usingany foo.js
  }
}

Notes

You can get a list of all provided dependencies using using Util API diagnostics (requires Diag API Diagnostics or by calling uHas() without any parameters.

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Availability
Status
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titleBeta

Requires:

  • Util.js v0.8 Warzone 3.1 or above
  • Util API
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See Also

Related functions:

children
Contents

Jump to:

Table of Contents
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Dependency Checking

Topics:

Child pages (Children Display)
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pageDependency Checking
excerpttrue