dynamic acess of objects problem

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  • Brad Esclavon
    #1

    dynamic acess of objects problem

    i am creating a page that creates 10-45 text input areas dynamically in a
    for loop. all the fields will be identical except for content, and i need a
    button to clear each corresponding field individually(al so dynamically
    created). i have tried to do it various ways, but i cant get the proper
    object declared, i always get object does not exist or object undefined
    errors. I dont even know what this is called so that i can look it up. im
    kind of lost as how to solve it.

    below is my code

    <script language="JavaS cript">
    <!--
    // num is the number corresponding to the appropiate textarea
    // function makeblank(num)
    {
    titlenum='txt' + num.toString();
    var txt = document.form1. txtnum;
    txt.value="";
    }
    //-->
    </script>

    <html>
    <form name="form1" action="/admin/feedback.php" method="post">

    <textarea name="txt1" style="width: 600px; height: 200px"></textarea>
    <textarea name="txt2" style="width: 600px; height: 200px"></textarea>
    <textarea name="txt3" style="width: 600px; height: 200px"></textarea>

    </form>
    </html>


    Tags: None
    • Lasse Reichstein Nielsen
      #2
      Re: dynamic acess of objects problem

      "Brad Esclavon" <gtg724h@mail.g atech.edu> writes:
      [color=blue]
      > i am creating a page that creates 10-45 text input areas dynamically in a
      > for loop. all the fields will be identical except for content, and i need a
      > button to clear each corresponding field individually(al so dynamically
      > created). i have tried to do it various ways, but i cant get the proper
      > object declared, i always get object does not exist or object undefined
      > errors. I dont even know what this is called so that i can look it up. im
      > kind of lost as how to solve it.
      >
      > below is my code[/color]
      [color=blue]
      > <script language="JavaS cript">[/color]

      It's
      <script type="text/javascript">
      in HTML 4 and later.
      [color=blue]
      > <!--[/color]

      You don't need HTML comments in Javascript.
      [color=blue]
      > // num is the number corresponding to the appropiate textarea
      > // function makeblank(num)[/color]

      This line shouldn't be commented out?
      [color=blue]
      > {
      > titlenum='txt' + num.toString();
      > var txt = document.form1. txtnum;[/color]

      Is it "titlenum" or "txtnum"?
      [color=blue]
      > txt.value="";
      > }
      > //-->
      > </script>[/color]

      What you probably need is:
      ---
      <script type="text/javascript">
      function makeblank(num)
      {
      document.forms['form1'].elements['txt'+num].value="";
      }
      </script>
      ---
      /L
      --
      Lasse Reichstein Nielsen - lrn@hotpop.com
      DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleD OM.html>
      'Faith without judgement merely degrades the spirit divine.'

        Comment

        • DU
          #3
          Re: dynamic acess of objects problem

          Brad Esclavon wrote:

          [color=blue]
          >
          > <html>
          > <form name="form1" action="/admin/feedback.php" method="post">
          >
          > <textarea name="txt1" style="width: 600px; height: 200px"></textarea>[/color]

          I just wanted to add this to Lasse's excellent post.

          rows and cols are required attributes in HTML 4 and in all other HTML
          versions. These attributes are mandatory as they help browsers figure
          out when/where to wrap text lines.
          HTML 3.2 Reference Specification
          http://www.w3.org/TR/REC-html32#textarea

          Forms in HTML documents
          http://www.w3.org/TR/html401/interact/forms.html#edef-TEXTAREA



          DU
          --
          Javascript and Browser bugs:
          IIS 7.5 Detailed Error - 404.0 - Not Found
          http://www10.brinkster.com/doctorunclear/

          - Resources, help and tips for Netscape 7.x users and Composer
          - Interactive demos on Popup windows, music (audio/midi) in Netscape 7.x
          IIS 7.5 Detailed Error - 404.0 - Not Found
          http://www10.brinkster.com/doctorunclear/Netscape7/Netscape7Section.html


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