What could cause scrollWidth to return 0?

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  • Robert Oschler
    #1

    What could cause scrollWidth to return 0?

    I have a "child" document that I use for an IFRAME element that I put into
    several "parent" documents. These "parent" documents therefore contain the
    IFRAME whose SRC property is set to the "child" document.

    The parent(s) have three Javascript functions, here they are:

    // =============== ==============

    var gMargin = 5;

    function getScrollWidth( doc, callerId)
    {

    if (true)
    {
    // If no document reference was passed, assume it is the
    // current document.
    if (!doc)
    doc = document;

    var ret;

    if (doc.all)
    {
    // Internet Explorer.
    if (doc.compatMode &&
    doc.compatMode != 'BackCompat')
    ret = doc.documentEle ment.scrollWidt h + gMargin + 'px';
    else
    ret = doc.body.scroll Width + gMargin + 'px';
    } // if (doc.all)
    else if (doc.width)
    // Other browsers.
    ret = doc.width + gMargin + 'px';

    // alert('(getScro llWidth) Returning scroll width(' + ret + ') to
    caller Id: ' + callerId);

    return ret;
    } // if (true)
    }

    // =============== ==============

    function getScrollHeight (doc, callerId)
    {
    if (true)
    {
    // If no document reference was passed, assume it is the
    // current document.
    if (!doc)
    doc = document;

    var ret;

    if (doc.all)
    {
    // Internet Explorer.
    if (doc.compatMode &&
    doc.compatMode != 'BackCompat')
    ret = doc.documentEle ment.scrollHeig ht + gMargin + 'px';
    else
    ret = doc.body.scroll Height + gMargin + 'px';
    } // if (doc.all)
    else if (doc.height)
    // Other browsers.
    ret = doc.height + gMargin+ 'px';

    // alert('(getScro llHeight) Returning scroll height(' + ret + ') to
    caller Id: ' + callerId);

    return ret;
    } // if (true)
    }

    // ---------------------------------------------------------------

    function getScrollHeight (doc, callerId)
    {
    if (true)
    {
    // If no document reference was passed, assume it is the
    // current document.
    if (!doc)
    doc = document;

    var ret;

    if (doc.all)
    {
    // Internet Explorer.
    if (doc.compatMode &&
    doc.compatMode != 'BackCompat')
    ret = doc.documentEle ment.scrollHeig ht + gMargin + 'px';
    else
    ret = doc.body.scroll Height + gMargin + 'px';
    } // if (doc.all)
    else if (doc.height)
    // Other browsers.
    ret = doc.height + gMargin+ 'px';

    // alert('(getScro llHeight) Returning scroll height(' + ret + ') to
    caller Id: ' + callerId);

    return ret;
    } // if (true)
    }

    // ---------------------------------------------------------------



    In the "onload" event of the "child" document, a call is made to a function
    call in the "parent"'s Javascript like this:

    <BODY onload="parent. resizeIFrame(do cument, parent.getScrol lWidth(),
    parent.getScrol lHeight(), 'test');" >
    .... // rest of HTML
    </BODY>


    causing the "parent" document to resize the IFRAME to the scrollWidth and
    scrollHeight of the "child" document. It works great on one "parent"
    document, but on another I get 0 for the "child" document's scrollWidth and
    scrollHeight properties.

    What could cause this?

    BTW, Testing is being done with Internet Explorer 6.x.

    thx

    --

    Robert Oschler


    Tags: None
    • Robert Oschler
      #2
      Re: What could cause scrollWidth to return 0?

      I accidentally duplicated the getScrollHeight () function call and forgot the
      resizeIFrame() function call, here is the latter:

      function resizeIFrame(id , x, y, callerId)
      {
      var SX = "";
      var SY = "";

      if (true)
      {
      SX = x + '';
      SY = y + '';

      if (SX.indexOf('px ') == -1)
      SX = SX + 'px';

      if (SY.indexOf('px ') == -1)
      SY = SY + 'px';

      // alert("(resizeI Frame), called by '" + callerId + "'> id = " + id
      + ", x = " + x + ", y = " + y);

      var iframeElement = null;

      // alert("(resizeI Frame) set iframeElement to null.");
      if (top.document.a ll)
      {
      // Internet Explorer.
      // alert('(resizeI frame) IE browser.');
      iframeElement = top.document.al l[id];

      } // if (document.all)
      else if (top.document.h eight)
      {
      // Other browsers.
      // alert('(resizeI frame) Non-IE browser.');
      iframeElement =
      top.document.ge tElementById(id );
      } // else if (top.document.h eight)

      if (iframeElement)
      {
      iframeElement.s tyle.width = x;
      iframeElement.s tyle.height = y;
      // alert("(resizeI Frame) iframeElement.s tyle (width, height) = "
      + iframeElement.s tyle.width + ", " + iframeElement.s tyle.height);
      }
      else
      alert('(resizeI Frame) iframeElement is null for id = ' + id);
      } // if (true)
      }

      // ---------------------------------------------------------------


      --

      Robert Oschler


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