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/* Copyright (c) 2006 Brandon Aaron (http://brandonaaron.net)
* Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
* and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
*
* $LastChangedDate: 2007-07-21 18:44:59 -0500 (Sat, 21 Jul 2007) $
* $Rev: 2446 $
*
* Version 2.1.1
*/
(function($){
/**
* The bgiframe is chainable and applies the iframe hack to get
* around zIndex issues in IE6. It will only apply itself in IE6
* and adds a class to the iframe called 'bgiframe'. The iframe
* is appeneded as the first child of the matched element(s)
* with a tabIndex and zIndex of -1.
*
* By default the plugin will take borders, sized with pixel units,
* into account. If a different unit is used for the border's width,
* then you will need to use the top and left settings as explained below.
*
* NOTICE: This plugin has been reported to cause perfromance problems
* when used on elements that change properties (like width, height and
* opacity) a lot in IE6. Most of these problems have been caused by
* the expressions used to calculate the elements width, height and
* borders. Some have reported it is due to the opacity filter. All
* these settings can be changed if needed as explained below.
*
* @example $('div').bgiframe();
* @before <div><p>Paragraph</p></div>
* @result <div><iframe class="bgiframe".../><p>Paragraph</p></div>
*
* @param Map settings Optional settings to configure the iframe.
* @option String|Number top The iframe must be offset to the top
* by the width of the top border. This should be a negative
* number representing the border-top-width. If a number is
* is used here, pixels will be assumed. Otherwise, be sure
* to specify a unit. An expression could also be used.
* By default the value is "auto" which will use an expression
* to get the border-top-width if it is in pixels.
* @option String|Number left The iframe must be offset to the left
* by the width of the left border. This should be a negative
* number representing the border-left-width. If a number is
* is used here, pixels will be assumed. Otherwise, be sure
* to specify a unit. An expression could also be used.
* By default the value is "auto" which will use an expression
* to get the border-left-width if it is in pixels.
* @option String|Number width This is the width of the iframe. If
* a number is used here, pixels will be assume. Otherwise, be sure
* to specify a unit. An experssion could also be used.
* By default the value is "auto" which will use an experssion
* to get the offsetWidth.
* @option String|Number height This is the height of the iframe. If
* a number is used here, pixels will be assume. Otherwise, be sure
* to specify a unit. An experssion could also be used.
* By default the value is "auto" which will use an experssion
* to get the offsetHeight.
* @option Boolean opacity This is a boolean representing whether or not
* to use opacity. If set to true, the opacity of 0 is applied. If
* set to false, the opacity filter is not applied. Default: true.
* @option String src This setting is provided so that one could change
* the src of the iframe to whatever they need.
* Default: "javascript:false;"
*
* @name bgiframe
* @type jQuery
* @cat Plugins/bgiframe
* @author Brandon Aaron (brandon.aaron@gmail.com || http://brandonaaron.net)
*/
$.fn.bgIframe = $.fn.bgiframe = function(s) {
// This is only for IE6
if ( $.browser.msie && /6.0/.test(navigator.userAgent) ) {
s = $.extend({
top : 'auto', // auto == .currentStyle.borderTopWidth
left : 'auto', // auto == .currentStyle.borderLeftWidth
width : 'auto', // auto == offsetWidth
height : 'auto', // auto == offsetHeight
opacity : true,
src : 'javascript:false;'
}, s || {});
var prop = function(n){return n&&n.constructor==Number?n+'px':n;},
html = '<iframe class="bgiframe"frameborder="0"tabindex="-1"src="'+s.src+'"'+
'style="display:block;position:absolute;z-index:-1;'+
(s.opacity !== false?'filter:Alpha(Opacity=\'0\');':'')+
'top:'+(s.top=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderTopWidth)||0)*-1)+\'px\')':prop(s.top))+';'+
'left:'+(s.left=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderLeftWidth)||0)*-1)+\'px\')':prop(s.left))+';'+
'width:'+(s.width=='auto'?'expression(this.parentNode.offsetWidth+\'px\')':prop(s.width))+';'+
'height:'+(s.height=='auto'?'expression(this.parentNode.offsetHeight+\'px\')':prop(s.height))+';'+
'"/>';
return this.each(function() {
if ( $('> iframe.bgiframe', this).length == 0 )
this.insertBefore( document.createElement(html), this.firstChild );
});
}
return this;
};
})(jQuery);
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