'Object' is undefined

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  • sams
    #1

    'Object' is undefined

    Iam trying to make the devshed tutorial for JavaScrip Object lesson to
    work in my PC. The calendar.js file has the object 'Calendar'
    constructed but when I called using the below html doc, I get the
    "Calendar' is undefined error for line 6 and 7, where the obj1 and
    obj2 are specified.
    The full code of the calendar.js is in
    DEVShed
    http://www.devshed.com/Client_Side/JavaScript/Object/page9.html
    Founded in 1997, DEVShed is the perfect place for web developers to learn, share their work, and build upon the ideas of others.


    Both the files are in the same directory. Iam using Windows 2000
    Professional with IE6.

    Appreciate any help to resolve this problem.

    <html>
    <head>
    <script language="JavaS cript" src="calendar.j s"></script>
    </head>
    <body bgcolor="white" >
    <script> obj1 = new Calendar(2, 2005); </script>
    <script> obj2 = new Calendar(7, 2001); </script>
    </body>
    </html>


    TIA

    Sam
    Tags: js undefined, object undefined
    • HikksNotAtHome
      #2
      Re: 'Object' is undefined

      In article <4d010e73.03100 91737.4ef949ac@ posting.google. com>, sams@freeddns.o rg
      (sams) writes:
      [color=blue]
      >Appreciate any help to resolve this problem.
      >
      >
      ><head>
      ><script language="JavaS cript" src="calendar.j s"></script>
      ></head>
      >
      ><script> obj1 = new Calendar(2, 2005); </script>
      ><script> obj2 = new Calendar(7, 2001); </script>[/color]

      Its a timing issue. You are trying to call the new Calendar() function before
      the calendar.js file has loaded to the point that it exists. Try using the
      onload to fire them off, and it should solve the undefined object errors.
      --
      Randy

        Comment

        • Lasse Reichstein Nielsen
          #3
          Re: 'Object' is undefined

          hikksnotathome@ aol.com (HikksNotAtHome ) writes:
          [color=blue]
          > Its a timing issue. You are trying to call the new Calendar() function before
          > the calendar.js file has loaded to the point that it exists. Try using the
          > onload to fire them off, and it should solve the undefined object errors.[/color]

          That is unlikely. The script is loaded and executed before parsing
          continues. Some browsers allow parsing to continue earlier by adding
          the defer attribute to the script tag, but it will still stop at the
          next non-defer script tag.

          A more likely problem is that "calendar.j s" is a verbatim copy of the
          script on the referred page ... including the <script> tag.

          In an external JS file, you must not have
          <script language="JavaS cript">
          at the beginning and </script> at the end. That will give syntax errors
          that will prevent the file from being executed.

          The page at devshed.com is slightly misguiding in that it gives the
          code with <script> tags around, but later gives code that uses it
          as an external file.

          /L
          --
          Lasse Reichstein Nielsen - lrn@hotpop.com
          Art D'HTML: <URL:http://www.infimum.dk/HTML/randomArtSplit. html>
          'Faith without judgement merely degrades the spirit divine.'

            Comment

            • HikksNotAtHome
              #4
              Re: 'Object' is undefined

              In article <r81lu8nh.fsf@h otpop.com>, Lasse Reichstein Nielsen <lrn@hotpop.com >
              writes:
              [color=blue]
              >hikksnotathome @aol.com (HikksNotAtHome ) writes:
              >[color=green]
              >> Its a timing issue. You are trying to call the new Calendar() function[/color]
              >before[color=green]
              >> the calendar.js file has loaded to the point that it exists. Try using the
              >> onload to fire them off, and it should solve the undefined object errors.[/color]
              >
              >That is unlikely. The script is loaded and executed before parsing
              >continues. Some browsers allow parsing to continue earlier by adding
              >the defer attribute to the script tag, but it will still stop at the
              >next non-defer script tag.[/color]

              So if I load 100 .js files, then nothing will happen until all 100 of those
              files are loaded? Or am I understanding wrong?

              I know the onload event handler won't fire until the entire page is loaded, but
              I seem to recall having problems where I was trying to call functions that had
              not been downloaded from an external .js file in the past. Using the body's
              onload to call them solved my problems.

              Although, with regards to the OP, I didn't look at the .js file to see if it
              had the most common error - the script tags in it.
              --
              Randy

                Comment

                • Lasse Reichstein Nielsen
                  #5
                  Re: 'Object' is undefined

                  hikksnotathome@ aol.com (HikksNotAtHome ) writes:
                  [color=blue]
                  > So if I load 100 .js files, then nothing will happen until all 100
                  > of those files are loaded? Or am I understanding wrong?[/color]

                  That is correct. You can check it with only one JS file where you do
                  something boring like counting to a hundred million.

                  <h1>Header</h1>
                  <script type="text/javscript" src="longjs.js" ></script>
                  <!-- script contains
                  for (var i=0;i<100000000 ;i++) {var x=i;}
                  -->
                  <h1>Header</h1>
                  [color=blue]
                  > I know the onload event handler won't fire until the entire page is
                  > loaded, but I seem to recall having problems where I was trying to
                  > call functions that had not been downloaded from an external .js
                  > file in the past. Using the body's onload to call them solved my
                  > problems.[/color]

                  If you could remember which browser you were using, it's worth
                  testing.

                  Waiting for the scripts to finish is actually necessary, since they
                  can contain document.write' s, and even document.write' s writing new
                  script tags that can define functions that the next script tag will
                  need.
                  [color=blue]
                  > Although, with regards to the OP, I didn't look at the .js file to
                  > see if it had the most common error - the script tags in it.[/color]

                  It's a guess. He didn't show us his .js file, but from the description
                  he seemed to be following, it is a likely mistake.

                  /L
                  --
                  Lasse Reichstein Nielsen - lrn@hotpop.com
                  Art D'HTML: <URL:http://www.infimum.dk/HTML/randomArtSplit. html>
                  'Faith without judgement merely degrades the spirit divine.'

                    Comment

                    • HikksNotAtHome
                      #6
                      Re: 'Object' is undefined

                      In article <llrt5pxb.fsf@h otpop.com>, Lasse Reichstein Nielsen <lrn@hotpop.com >
                      writes:
                      [color=blue]
                      >hikksnotathome @aol.com (HikksNotAtHome ) writes:
                      >[color=green]
                      >> So if I load 100 .js files, then nothing will happen until all 100
                      >> of those files are loaded? Or am I understanding wrong?[/color]
                      >
                      >That is correct. You can check it with only one JS file where you do
                      >something boring like counting to a hundred million.
                      >[/color]

                      It seems the one I used to test it was a simple array file that had 30k or so
                      entries, and tried to process it before the page loaded and got errors (NS6 I
                      think, but don't remember for sure). Since NS6 is basically old now, it may be
                      something that got changed in NS7, or, I could be remembering the browser
                      wrong.
                      [color=blue][color=green]
                      >> I know the onload event handler won't fire until the entire page is
                      >> loaded, but I seem to recall having problems where I was trying to
                      >> call functions that had not been downloaded from an external .js
                      >> file in the past. Using the body's onload to call them solved my
                      >> problems.[/color]
                      >
                      >If you could remember which browser you were using, it's worth
                      >testing.[/color]

                      I think it was NS6 but not absolutely positive. Its been about a year or so,
                      and didn't really worry with it anymore, just moved it to the onload and went
                      on as a happy camper :)
                      [color=blue]
                      >Waiting for the scripts to finish is actually necessary, since they
                      >can contain document.write' s, and even document.write' s writing new
                      >script tags that can define functions that the next script tag will
                      >need.[/color]

                      necessary or desirable? I can't see where the browser could know that it would
                      be necessary to wait. If it could, it could be assumed that the browser should
                      know to wait for the page to load before executing scripts, as it may need an
                      element in the body that doesn't exist yet. But I can see the logic behind not
                      executing more script until the last script loads though.
                      [color=blue][color=green]
                      >> Although, with regards to the OP, I didn't look at the .js file to
                      >> see if it had the most common error - the script tags in it.[/color]
                      >
                      >It's a guess. He didn't show us his .js file, but from the description
                      >he seemed to be following, it is a likely mistake.[/color]

                      Isn't it just grand trying to debug code you can't see? <g>
                      --
                      Randy

                        Comment

                        • Richard Cornford
                          #7
                          Re: 'Object' is undefined

                          "HikksNotAtHome " <hikksnotathome @aol.com> wrote in message
                          news:2003101020 2113.15462.0000 3486@mb-m06.aol.com...[color=blue]
                          > In article <llrt5pxb.fsf@h otpop.com>, Lasse Reichstein Nielsen[/color]
                          <lrn@hotpop.com >
                          <snip>[color=blue]
                          >It seems the one I used to test it was a simple array file that
                          >had 30k or so entries, and tried to process it before the page
                          >loaded and got errors (NS6 I think, but don't remember for sure).
                          >Since NS6 is basically old now, it may be something that got
                          >changed in NS7, or, I could be remembering the browser wrong.[/color]
                          <snip>

                          I remember having timing problems with Netscape 6.2 loading a 90k array
                          in a JS file, so I think you have the right browser.

                          Richard.


                            Comment

                            • sams
                              #8
                              Re: 'Object' is undefined

                              > In an external JS file, you must not have[color=blue]
                              > <script language="JavaS cript">
                              > at the beginning and </script> at the end. That will give syntax errors
                              > that will prevent the file from being executed.[/color]

                              Thank you, I removed the <Script></script> tags from the .js file and
                              no other change. It worked. Great.

                              Apprecite all your help.

                              Sam

                                Comment

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