Why is array undefined???

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  • Dave Casserly
    #1

    Why is array undefined???

    <html>
    <head>
    <title>Testin g JSP</title>

    <script type="text/javascript">

    var numbers = new Array("one", "two", "three", "four", "five");

    function test() {
    for(var i = 0; i < 5; i++) {
    document.writel n("It is: " + numbers[i]);
    }
    }

    </script>
    </head>
    <body onload="test()" >

    </body>
    </html>

    When i run this, it outputs "It is: one" and then complains that the
    varibale numbers is undefined???

    Why does it do this?

    Thanks

    Tags: None
    • Janwillem Borleffs
      #2
      Re: Why is array undefined???

      Dave Casserly wrote:[color=blue]
      > When i run this, it outputs "It is: one" and then complains that the
      > varibale numbers is undefined???
      >[/color]

      Because you are using document.writel n after the document has been loaded,
      it's content gets overwritten, including the array definition.

      Move the call to test() to the body section, remove the onload event from
      the body tag and you will be fine.


      JW



        Comment

        • Grant Wagner
          #3
          Re: Why is array undefined???

          Dave Casserly wrote:
          [color=blue]
          > <html>
          > <head>
          > <title>Testin g JSP</title>
          >
          > <script type="text/javascript">
          >
          > var numbers = new Array("one", "two", "three", "four", "five");
          >
          > function test() {
          > for(var i = 0; i < 5; i++) {
          > document.writel n("It is: " + numbers[i]);
          > }
          > }
          >
          > </script>
          > </head>
          > <body onload="test()" >
          >
          > </body>
          > </html>
          >
          > When i run this, it outputs "It is: one" and then complains that the
          > varibale numbers is undefined???
          >
          > Why does it do this?
          >
          > Thanks[/color]

          Because after the script runs document.writel n() it wipes out the content of
          the current page, including everything between <script> and </script>

          You shouldn't document.write( ) or writeln() to a document that has completed
          loading and has been closed.

          <body>
          <script type="text/javascript">
          var numbers = new Array("one", "two", "three", "four", "five");
          function test() {
          for(var i = 0; i < 5; i++) {
          document.writel n("It is: " + numbers[i]);
          }
          }
          </script>
          </body>

          Will work. As will:

          <body>
          <script type="text/javascript">
          test();
          </script>
          </body>

          --
          | Grant Wagner <gwagner@agrico reunited.com>

          * Client-side Javascript and Netscape 4 DOM Reference available at:
          *
          http://devedge.netscape.com/library/manuals/2000/javascript/1.3/reference/frames.html


          * Internet Explorer DOM Reference available at:
          *
          Microsoft Learn: Build with answers in reach
          http://msdn.microsoft.com/workshop/author/dhtml/reference/dhtml_reference_entry.asp
          Find official documentation, practical know-how, and expert guidance for builders working and troubleshooting in Microsoft products.


          * Netscape 6/7 DOM Reference available at:
          * http://www.mozilla.org/docs/dom/domref/
          * Tips for upgrading JavaScript for Netscape 7 / Mozilla
          * http://www.mozilla.org/docs/web-deve...upgrade_2.html


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