Javascript window is not defined

Question

I m trying to learn JavaScript  but the following code has been giving me a lot of trouble   window onload   function          for   var i   0  i  lt  seats length  i              for   var j   0  j  lt  seats length  j                  document getElementById getSeatId i  j   onclick   function evt                    getSeatStatus getSeatId i  j                                       document getElementById  search   onclick   findSeat      document getElementById  male search   onclick   findMaleSeats      initSeats         It is from an external JS file and it is the only file linked to the page  findSeat  findMaleSeats  getSeatId  and initSeats are all defined a little bit later in the file  When I double click this file  I get the following error      Windows Script Host Error   window  is not defined Code  800A1391    I already tried moving the code to other places in the file  assigning a different function  even an empty function  to window onload and many other things  It just seems that my computer doesn t know what window is  And if I try to open the HTML in a browser the nothing loads  as one would expect    Does someone know what is wrong with this

User · Answer

The window object represents an open window in a browser  Since you are not running your code within a browser  but via Windows Script Host  the interpreter won t be able to find the window object  since it does not exist  since you re not within a web browser

User · Answer

It is from an external js file and it is the only file linked to the page    OK      When I double click this file I get the following error   Sounds like you re double-clicking running a  js file  which will attempt to run the script outside the browser  like a command line script  And that would explain this error   Windows Script Host Error   window  is not defined Code  800A1391      not an error you ll see in a browser  And of course  the browser is what supplies the window object   ADDENDUM  As a course of action  I d suggest opening the relevant HTML file and taking a peek at the console  If you don t see anything there  it s likely your window onload definition is simply being hit after the browser fires the window onload event

User · Answer

Trying to access an undefined variable will throw you a ReferenceError  A solution to this is to use typeof  if  typeof window      quot undefined quot       console log  quot Oops   window  is not defined quot      or a try catch  try   window   catch  err      console log  quot Oops   window  is not defined quot      While typeof window is probably the cleanest of the two  the try catch can still be useful in some cases

[javascript] Javascript: 'window' is not defined

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