z-index css Pop-up box and ie7 - css

Question

I have some div boxes which should show a speech box when on hover. With jQuery and CSS it’s nothing too hard.
However, the popup speech appears under the neighbor div in IE7 — I can not make it to appear under it (see the shots).
I tried to play with z-index at different spots with no success.
FF
alt text http://img134.imageshack.us/img134/5314/63386894.png
IE7
alt text http://img396.imageshack.us/img396/9329/95483890.png
HTML
<div class="boardshot_list">
{% for ... %}
<span class="img_box">
<a href="/site_media/xxx" target="_blank">
<img class="trigger" src="xxx" alt="{{ item.title }}" />
</a>
<div class="container_speech_box popup">
<div class="two">
<b class="tl"><b class="tr"></b></b>
<p>
blabla
</p>
<b class="bl"></b><b class="br"><b class="point"></b></b>
</div>
</div>
</span>
{% endfor %}
</div>
CSS
div.boardshot_list span.img_box {
display:block;
width:220px;
height:180px;
float: left;
margin: 0 10px 10px 0;
position: relative;
}
img.trigger{
border:1px solid #373743;
}
div.popup
{
display: none;
position: absolute;
z-index: 50;
}
/* POPUP rounded box */
.container_speech_box div:after {content: "."; display: block; height:11px; clear:both; visibility:hidden;}
.container_speech_box div {width:300px; height:auto; font-family:verdana; font-size:11px;}
b.tl {display:block; width:300px; height:8px; font-size:1px;}
b.tr {display:block; width:292px; height:8px; font-size:1px; float:right;}
b.bl {display:block; width:8px; height:8px; font-size:1px; float:left;}
b.br {display:block; width:292px; height:8px; font-size:1px; float:right; position:relative;}
b.point {display:block; font-size:1px; width:25px; height:14px;}
.container_speech_box div p {padding:8px; margin:0; border:3px solid #4f5b69; border-width:0 3px; text-align:justify;}
div.two b.tl {background:url(/site_media/images/top_left2.gif) top left no-repeat;}
div.two b.tr {background:url(/site_media/images/top_right2.gif) top right no-repeat;}
div.two p {background:#fff;}
div.two b.bl {background:url(/site_media/images/bottom_left2.gif) top left no-repeat;}
div.two b.br {background:url(/site_media/images/bottom_right2.gif) top right no-repeat;}
div.two b.point {background:url(/site_media/images/point2.gif) top left no-repeat; margin:5px 0 0 125px;}
/* end popup table */
div.boardshot_list {
width: 700px;
clear: left;
min-height: 80px;
}
div.boardshot_list .memo_id {
padding-left: 10px;
position: relative;
float:right;
color:#60564d;
font-size: 25px;
padding-top: 20px;
width: 50px;
top: 30px;
left: 10px;
font-family:"Palatino Linotype","Book Antiqua",Palatino,FreeSerif,serif;
}
div.boardshot_list.even {
background-color: #f3f5f6;
}
div.boardshot_list .title span{
color: #bbb;
font-weight: normal;
}
div.boardshot_list .img img {
border:1px solid #373743;
}
JS
<script type="text/javascript">
$(document).ready(function(){
$('.img_box').each(function () {
// options
var distance = 10;
var time = 250;
var hideDelay = 50;
var hideDelayTimer = null;
// tracker
var beingShown = false;
var shown = false;
var trigger = $('.trigger', this);
var popup = $('.popup', this).css('opacity', 0);
// set the mouseover and mouseout on both element
$([trigger.get(0), popup.get(0)]).mouseover(function () {
// stops the hide event if we move from the trigger to the popup element
if (hideDelayTimer) clearTimeout(hideDelayTimer);
// don't trigger the animation again if we're being shown, or already visible
if (beingShown || shown) {
return;
} else {
beingShown = true;
// reset position of popup box
popup.css({
top: -10,
left: 20,
display: 'block' // brings the popup back in to view
})
// (we're using chaining on the popup) now animate it's opacity and position
.animate({
top: '-=' + distance + 'px',
opacity: 0.9
}, time, 'swing', function() {
// once the animation is complete, set the tracker variables
beingShown = false;
shown = true;
});
}
}).mouseout(function () {
// reset the timer if we get fired again - avoids double animations
if (hideDelayTimer) clearTimeout(hideDelayTimer);
// store the timer so that it can be cleared in the mouseover if required
hideDelayTimer = setTimeout(function () {
hideDelayTimer = null;
popup.animate({
opacity: 0
}, time, 'swing', function () {
shown = false;
popup.css('display', 'none');
});
}, hideDelay);
});
});
});
</script>

Answer 1

I think this is due to a z-index bug in Internet Explorer. Positioned elements (i.e. elements with a position other than static) establish their own stacking context.
http://www.quirksmode.org/bugreports/archives/2006/01/Explorer_z_index_bug.html
In my experience, it’s as if all your div.boardshot_list span.img_box have a z-index of 0, and elements inside each div.boardshot_list span.img_box have a z-indexes of 0.1, 0.2 and so on, instead of 1 and 2.
You should be able to fix the issue by setting the z-index of the span.img_box containing the visible pop-up to 1, like this:
// reset position of popup box
popup.css({
top: -10,
left: 20,
display: 'block' // brings the popup back in to view
})
$(this).css('z-index', '1');
Don’t forget to reset it to 0 when the pop-up disappears.

Answer 2

It's probably because of conflict of multiply classes (.container_speech_box and .popup) style resolution in different browsers. Try to wrap .popup div around the .container_speech_box.