undefined data in javascript

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  • Matt
    #1

    undefined data in javascript

    I have no idea why id is undefined in the arrow below. Please advise. Thanks!!

    <html>
    <head>
    <script type="text/javascript">
    var id;
    function window_onload()
    {
    id = "8888";
    alert("ID = " + id);
    }
    </script>
    </head>
    <H2>Page 2</H2>
    <body onload="window_ onload()">
    <P>id = <script type="text/javascript">doc ument.write(id) ;</script> //<****
    </body>
    </html>
    Tags: None
    • Randy Webb
      #2
      Re: undefined data in javascript

      Matt wrote:[color=blue]
      > I have no idea why id is undefined in the arrow below. Please advise. Thanks!!
      >
      > <html>
      > <head>
      > <script type="text/javascript">
      > var id;
      > function window_onload()
      > {
      > id = "8888";
      > alert("ID = " + id);
      > }
      > </script>
      > </head>
      > <H2>Page 2</H2>
      > <body onload="window_ onload()">
      > <P>id = <script type="text/javascript">doc ument.write(id) ;</script> //<****
      > </body>
      > </html>[/color]
      Because its value is not set until the onload event fires, which is
      *after* you try to write it, so its not set yet. So, you get undefined
      (which it is).



      --
      Randy
      Chance Favors The Prepared Mind
      comp.lang.javas cript FAQ - http://jibbering.com/faq/

        Comment

        • mscir
          #3
          Re: undefined data in javascript


          Randy Webb wrote:[color=blue]
          > Matt wrote:
          >[color=green]
          >> I have no idea why id is undefined in the arrow below. Please advise.
          >> Thanks!!
          >>
          >> <html>
          >> <head>
          >> <script type="text/javascript">
          >> var id;
          >> function window_onload()
          >> {
          >> id = "8888";
          >> alert("ID = " + id);
          >> }
          >> </script>
          >> </head>
          >> <H2>Page 2</H2>
          >> <body onload="window_ onload()">
          >> <P>id = <script type="text/javascript">doc ument.write(id) ;</script>
          >> //<****
          >> </body>
          >> </html>[/color]
          >
          > Because its value is not set until the onload event fires, which is
          > *after* you try to write it, so its not set yet. So, you get undefined
          > (which it is).[/color]

          Yup, I tried this:

          <html>
          <head>
          <script type="text/javascript">
          var id;
          function window_onload() {
          //id = "8888";
          alert("ID = " + id);
          }
          </script>
          </head>

          <body onload="window_ onload()">
          <script type="text/javascript">
          var id="8888";
          </script>
          <form>
          <P>id = <script type="text/javascript">doc ument.write(id) ;</script>
          </form>
          </body>
          </html>

            Comment

            • Lee
              #4
              Re: undefined data in javascript

              Matt said:[color=blue]
              >
              >I have no idea why id is undefined in the arrow below. Please advise. Thanks!!
              >
              ><html>
              ><head>
              ><script type="text/javascript">
              >var id;
              >function window_onload()
              >{
              > id = "8888";
              > alert("ID = " + id);
              >}
              ></script>
              ></head>
              ><H2>Page 2</H2>
              ><body onload="window_ onload()">
              ><P>id = <script type="text/javascript">doc ument.write(id) ;</script> //<****
              ></body>
              ></html>[/color]

              id isn't defined until the onLoad event handler executes,
              but the inline script tries to write its value as the page is still loading.

                Comment

                • mscir
                  #5
                  Re: undefined data in javascript

                  oops... forgot to clean it up first

                  <html>
                  <head>
                  <script type="text/javascript">
                  var id;
                  function window_onload() {
                  alert("ID = " + id);
                  }
                  </script>
                  </head>

                  <body onload="window_ onload()">
                  <script type="text/javascript">
                  id="8888";
                  </script>
                  <P>id = <script type="text/javascript">doc ument.write(id) ;</script>
                  </body>
                  </html>

                    Comment

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