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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/Window/length below:

Window: length property - Web APIs

MDN Web Docs
  1. References
  2. Web APIs
  3. Window
  4. length

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In this article
  1. Window
  2. Instance properties
    1. caches
    2. closed
    3. cookieStore
    4. credentialless Experimental
    5. crossOriginIsolated
    6. crypto
    7. customElements
    8. devicePixelRatio
    9. document
    10. documentPictureInPicture Experimental
    11. event Deprecated
    12. external Deprecated
    13. fence Experimental
    14. frameElement
    15. frames
    16. fullScreen Non-standard
    17. history
    18. indexedDB
    19. innerHeight
    20. innerWidth
    21. isSecureContext
    22. launchQueue Experimental
    23. length
    24. localStorage
    25. location
    26. locationbar
    27. menubar
    28. mozInnerScreenX Non-standard
    29. mozInnerScreenY Non-standard
    30. name
    31. navigation Experimental
    32. navigator
    33. opener
    34. orientation Deprecated
    35. origin
    36. originAgentCluster
    37. outerHeight
    38. outerWidth
    39. parent
    40. performance
    41. personalbar
    42. scheduler
    43. screen
    44. screenLeft
    45. screenTop
    46. screenX
    47. screenY
    48. scrollbars
    49. scrollMaxX Non-standard
    50. scrollMaxY Non-standard
    51. scrollX
    52. scrollY
    53. self
    54. sessionStorage
    55. sharedStorage Experimental
    56. speechSynthesis
    57. status Deprecated
    58. statusbar
    59. toolbar
    60. top
    61. trustedTypes
    62. visualViewport
    63. window
  3. Instance methods
    1. alert()
    2. atob()
    3. blur() Deprecated
    4. btoa()
    5. cancelAnimationFrame()
    6. cancelIdleCallback()
    7. captureEvents() Deprecated
    8. clearImmediate() Non-standard Deprecated
    9. clearInterval()
    10. clearTimeout()
    11. close()
    12. confirm()
    13. createImageBitmap()
    14. dump() Non-standard
    15. fetch()
    16. fetchLater() Experimental
    17. find() Non-standard
    18. focus()
    19. getComputedStyle()
    20. getDefaultComputedStyle() Non-standard
    21. getScreenDetails() Experimental
    22. getSelection()
    23. matchMedia()
    24. moveBy()
    25. moveTo()
    26. open()
    27. postMessage()
    28. print()
    29. prompt()
    30. queryLocalFonts() Experimental
    31. queueMicrotask()
    32. releaseEvents() Deprecated
    33. reportError()
    34. requestAnimationFrame()
    35. requestFileSystem() Non-standard Deprecated
    36. requestIdleCallback()
    37. resizeBy()
    38. resizeTo()
    39. scroll()
    40. scrollBy()
    41. scrollByLines() Non-standard
    42. scrollByPages() Non-standard
    43. scrollTo()
    44. setImmediate() Non-standard Deprecated
    45. setInterval()
    46. setResizable() Non-standard Deprecated
    47. setTimeout()
    48. showDirectoryPicker() Experimental
    49. showOpenFilePicker() Experimental
    50. showSaveFilePicker() Experimental
    51. sizeToContent() Non-standard
    52. stop()
    53. structuredClone()
    54. webkitConvertPointFromNodeToPage() Non-standard Deprecated
    55. webkitConvertPointFromPageToNode() Non-standard Deprecated
  4. Events
    1. afterprint
    2. appinstalled
    3. beforeinstallprompt
    4. beforeprint
    5. beforeunload
    6. blur
    7. copy
    8. cut
    9. devicemotion
    10. deviceorientation
    11. deviceorientationabsolute
    12. error
    13. focus
    14. gamepadconnected
    15. gamepaddisconnected
    16. hashchange
    17. languagechange
    18. load
    19. message
    20. messageerror
    21. offline
    22. online
    23. orientationchange Deprecated
    24. pagehide
    25. pagereveal
    26. pageshow
    27. pageswap
    28. paste
    29. popstate
    30. rejectionhandled
    31. resize
    32. scrollsnapchange Experimental
    33. scrollsnapchanging Experimental
    34. storage
    35. unhandledrejection
    36. unload Deprecated
    37. vrdisplayactivate Non-standard Deprecated
    38. vrdisplayconnect Non-standard Deprecated
    39. vrdisplaydeactivate Non-standard Deprecated
    40. vrdisplaydisconnect Non-standard Deprecated
    41. vrdisplaypresentchange Non-standard Deprecated
  5. Inheritance
    1. EventTarget
In this article Window: length property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Returns the number of frames (either <frame> or <iframe> elements) in the window.

Value

A number.

Examples

js

if (window.length) {
  // this is a document with subframes
}
Specifications Specification HTML
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This page was last modified on Jun 7, 2024 by MDN contributors.

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