Javascript reserved words trigger “Expected Identifier” error on IE

If you’re getting an unreasonable “Expected Identifier” Javascript error on IE6/7, check to see if you have any variable names which are reserved words.

This also goes for HTML form element names:

<form name="aform">
    <input type="text" name="name" />
</form>

Then accessing document.aform.name.value would throw an error since name is a reserved word.

Javascript Reserved Words

  • abstract
  • alert
  • Anchor
  • Area
  • arguments
  • Array
  • assign
  • blur
  • boolean or Boolean
  • break
  • Button
  • byte
  • callee
  • caller
  • captureEvents
  • case
  • catch
  • char
  • Checkbox
  • class
  • clearInterval
  • clearTimeout
  • close
  • closed
  • comment
  • confirm
  • const
  • constructor
  • continue
  • Date
  • debugger
  • default
  • defaultStatus
  • delete
  • do
  • document
  • Document
  • double
  • Element
  • else
  • enum
  • escape
  • eval
  • export
  • extends
  • false
  • FileUpload
  • final
  • finally
  • find
  • float
  • focus
  • for
  • Form
  • Frame
  • frames
  • function
  • Function
  • getClass
  • goto
  • Hidden
  • history or History
  • home
  • if
  • Image
  • implements
  • import
  • in
  • Infinity
  • innerHeight
  • innerWidth
  • instanceOf
  • int
  • interface
  • isFinite
  • isNan
  • java
  • JavaArray
  • JavaClass
  • JavaObject
  • JavaPackage
  • label
  • length
  • Link
  • location or Location
  • locationbar
  • long
  • Math
  • menubar
  • MimeType
  • moveBy
  • moveTo
  • name
  • NaN
  • native
  • navigate
  • navigator or Navigator
  • netscape
  • new
  • null
  • Number
  • Object
  • onBlur
  • onError
  • onFocus
  • onLoad
  • onUnload
  • open
  • opener
  • Option
  • outerHeight
  • outerWidth
  • package
  • Packages
  • pageXoffset
  • pageYoffset
  • parent
  • parseFloat
  • parseInt
  • Password
  • personalbar
  • Plugin
  • print
  • private
  • prompt
  • protected
  • prototype
  • public
  • Radio
  • ref
  • RegExp
  • releaseEvents
  • Reset
  • resizeBy
  • resizeTo
  • return
  • routeEvent
  • scroll
  • scrollbars
  • scrollBy
  • scrollTo
  • Select
  • self
  • setInterval
  • setTimeout
  • short
  • static
  • status
  • statusbar
  • stop
  • String
  • Submit
  • sun
  • super
  • switch
  • synchronized
  • taint
  • Text
  • Textarea
  • this
  • throw
  • throws
  • toolbar
  • top
  • toString
  • transient
  • true
  • try
  • typeof
  • unescape
  • untaint
  • unwatch
  • valueOf
  • var
  • void
  • watch
  • while
  • window
  • Window
  • with

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