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display:none; element height issue, ifarme shim - multiple colapsable divs

Posted on 2008-06-17
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Last Modified: 2013-11-19
Hi All,

I have a the need for a menu (lets call it 'FON - float over nav') to position itself over the main workspace. I have a number of divs that open and close onclick using display:none; function that works great.

The problem comes with IE6 where by the FON has select feilds shining through, no problem I thought and added an iframe shim.

However, dependent on the page load state of the FON, if open I get a height say 300px, if closed I get 0px. When I open the FON from a closed start state the iframe doesn't catch up, i.e. it doesn't pick up the hieght of the now open FON's containing div.

To compound the matter I have colapsible sub elements within the containing FON div.

Is there any way to catch the height on changing the div's state from display:none; to display:'';

Heres an example of the code.


<html>
<head>
<script type="text/javascript">
    <!--
        function hideshow(element) {
                if (element.style.display=="none") 
                {
                    element.style.display="";
                } 
                else 
                {
                    element.style.display="none";
                }
        }
	-->
</script>
</head>
<body>
<div id="toolsleft" onclick="hideshow(document.getElementById('toolsleftopencont'));" title="expand">OPEN/CLOSE THE NAV</div>  
 
<div id="toolsleftopencont" style="display:none;">
 
    <h2 onclick="hideshow(document.getElementById('navgroup1'));hideshow(document.getElementById('navgroup1closed'));">Nav Item Group header</h2>
 
    <div id="navgroup1">
 
        <ul>
            <li>Nav Item</li>
            <li>Nav Item</li>
            <li>Nav Item</li>
            <li onclick="hideshow(document.getElementById('subcont1'));">Expandable Item</li>
            <li id="subcont1" class="subcont" style="display:none;">         
                <ul>
                    <li>Sub Nave Item</li>
                    <li>Sub Nave Item</li>
                    <li>Sub Nave Item</li>
                </ul> 
            </li>  
            <li>Nav Item</li>
            <li>Nav Item</li>
        </ul> 
        
    </div><!-- #navgroup1 -->
    
    <!-- Repeat navs as necessary -->
            
</div><!-- #toolsleftopencont -->
 
<!--[if lt IE 7]>	
<script type="text/javascript">
	var ltoolsH = document.getElementById('toolsleftopencont').offsetHeight;
	alert(ltoolsH);       
	//transparent iframe shim to block select fields from shining through
	document.write("<iframe id='toolsleftiframe' src='BLOCKED SCRIPTfalse;' style='height:"+ltoolsH+"px;position:absolute;z-index:-1;width:100%;filter:mask();'></iframe>");
</script>    
<![endif]-->
</body>
</html>

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Comment
Question by:canibefrank
  • 2
  • 2
4 Comments
 
LVL 29

Accepted Solution

by:
Pravin Asar earned 2000 total points
ID: 21814473
Here is a one option, which resize the iframe based on the size of div

 
<html>
<head>
<script type="text/javascript">
    <!--
// Absolute Position
function GetTagPixels(StartTag, Direction) {
   var PixelAmt = (Direction == 'LEFT') ? StartTag.offsetLeft : StartTag.offsetTop;
   while ((StartTag.tagName != 'BODY') && (StartTag.tagName != 'HTML')) {
      StartTag = StartTag.offsetParent;
      PixelAmt += (Direction == 'LEFT') ? StartTag.offsetLeft : StartTag.offsetTop;
   }
   return PixelAmt;
}
// Relative to container
 
function GetTagPosition (tagObj) {
	this.x = tagObj.offsetLeft;
	this.y = tagObj.offsetTop;
    return (this);
}
// Tag Dimension 
function GetTagDimension (tagObj) {
	this.width = tagObj.offsetWidth;
	this.height = tagObj.offsetHeight;
    return (this);
}
        function hideshow(element) {
                if (element.style.display=="none") 
                {
                    element.style.display="block";
                } 
                else 
                {
                    element.style.display="none";
                }
				adjustiframe();
        }
		function adjustiframe() {
		var dTag = document.getElementById('toolsleftopencont');
		var yMargin = 20;
		var xMargin = 20;
		var xpos = GetTagPixels (dTag, "LEFT");
   		var ypos = GetTagPixels (dTag, "TOP");
   		var dim  = GetTagDimension (dTag);
		var iframe = document.getElementById ('toolsleftiframe');
		iframe.style.height =dim.height + yMargin;
		iframe.style.width =dim.width + xMargin;
		}
        -->
</script>
</head>
<body>
<div id="toolsleft" onclick="hideshow(document.getElementById('toolsleftopencont'));" style="position:absolute; z-index:10;left: 10px; top: 10px;" title="expand">OPEN/CLOSE THE NAV</div>   
<div id="toolsleftopencont" style="display:none; width: 400px;">
 
    <h2 onclick="hideshow(document.getElementById('navgroup1'));hideshow(document.getElementById('navgroup1closed'));">Nav Item Group header</h2>
 
    <div id="navgroup1">
 
        <ul>
            <li>Nav Item</li>
            <li>Nav Item</li>
            <li>Nav Item</li>
            <li onclick="hideshow(document.getElementById('subcont1'));">Expandable Item</li>
            <li id="subcont1" class="subcont" style="display:none;">         
                <ul>
                    <li>Sub Nave Item</li>
                    <li>Sub Nave Item</li>
                    <li>Sub Nave Item</li>
                </ul> 
            </li>  
            <li>Nav Item</li>
            <li>Nav Item</li>
        </ul> 
        
    </div><!-- #navgroup1 -->
    
    <!-- Repeat navs as necessary -->
            
</div><!-- #toolsleftopencont -->
<div style="position:absolute; z-index:-1; top:0px; left: 0px;">
<iframe id="toolsleftiframe" src="" style="width: 300px; height:200px; ">
</iframe>
</div>
 
<!--[if lt IE 7]>       
<script type="text/javascript">
        var ltoolsH = document.getElementById('toolsleftopencont').offsetHeight;
        alert(ltoolsH);       
        //transparent iframe shim to block select fields from shining through
        document.write("<iframe id='toolsleftiframe' src='BLOCKED SCRIPTfalse;' style='height:"+ltoolsH+"px;position:absolute;z-index:-1;width:100%;filter:mask();'></iframe>");
</script>    
<[endif]-->
</body>
</html>

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Author Comment

by:canibefrank
ID: 21820618
Hi pravinasar,

That fits the bill perfectly, your a star thanks a lot.
0
 

Author Closing Comment

by:canibefrank
ID: 31467991
Nice one works a treat, exactly whta was required. Thanks.
0
 
LVL 29

Expert Comment

by:Pravin Asar
ID: 21824787
Glad to be of some help.

Thanks for the Grade.

-PA
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