Question

怎么解决 jquery ui插件 dialog函数引起的ie内存泄露

Answer 1

$.extend($.ui.dialog.overlay, {
instances: [],
oldInstances: [], //修改一：添加oldInstances
maxZ: 0,
events: $.map('focus,mousedown,mouseup,keydown,keypress,click'.split(','),
function(event) { return event + '.dialog-overlay'; }).join(' '),
create: function(dialog) {
if (this.instances.length === 0) {
// prevent use of anchors and inputs
// we use a setTimeout in case the overlay is created from an
// event that we're going to be cancelling (see #2804)
setTimeout(function() {
// handle $(el).dialog().dialog('close') (see #4065)
if ($.ui.dialog.overlay.instances.length) {
$(document).bind($.ui.dialog.overlay.events, function(event) {
var dialogZ = $(event.target).parents('.ui-dialog').css('zIndex') || 0;
return (dialogZ > $.ui.dialog.overlay.maxZ);
});
}
}, 1);
// allow closing by pressing the escape key
$(document).bind('keydown.dialog-overlay', function(event) {
(dialog.options.closeOnEscape && event.keyCode
&& event.keyCode == $.ui.keyCode.ESCAPE && dialog.close(event));
});
// handle window resize
$(window).bind('resize.dialog-overlay', $.ui.dialog.overlay.resize);
}
//修改二：替换var $el;
//var $el = $('<div></div>').appendTo(document.body)
// .addClass('ui-widget-overlay').css({
// width: this.width(),
// height: this.height()
// });
var $el = (this.oldInstances.pop() || $('<div></div>').addClass('ui-widget-overlay'))
.appendTo(document.body)
.css({
width: this.width(),
height: this.height()
});
(dialog.options.bgiframe && $.fn.bgiframe && $el.bgiframe());
this.instances.push($el);
return $el;
},
destroy: function($el) {
//修改三：替换注释的代码：
//this.instances.splice($.inArray(this.instances, $el), 1);
this.oldInstances.push(this.instances.splice($.inArray($el, this.instances), 1)[0]);
if (this.instances.length === 0) {
$([document, window]).unbind('.dialog-overlay');
}
$el.remove();

// adjust the maxZ to allow other modal dialogs to continue to work (see #4309)
var maxZ = 0;
$.each(this.instances, function() {
maxZ = Math.max(maxZ, this.css('z-index'));
});
this.maxZ = maxZ;
},
height: function() {
// handle IE 6
if ($.browser.msie && $.browser.version < 7) {
var scrollHeight = Math.max(
document.documentElement.scrollHeight,
document.body.scrollHeight
);
var offsetHeight = Math.max(
document.documentElement.offsetHeight,
document.body.offsetHeight
);
if (scrollHeight < offsetHeight) {
return $(window).height() + 'px';
} else {
return scrollHeight + 'px';
}
// handle "good" browsers
} else {
return $(document).height() + 'px';
}
},
width: function() {
// handle IE 6
if ($.browser.msie && $.browser.version < 7) {
var scrollWidth = Math.max(
document.documentElement.scrollWidth,
document.body.scrollWidth
);
var offsetWidth = Math.max(
document.documentElement.offsetWidth,
document.body.offsetWidth
);
if (scrollWidth < offsetWidth) {
return $(window).width() + 'px';
} else {
return scrollWidth + 'px';
}
// handle "good" browsers
} else {
return $(document).width() + 'px';
}
},
resize: function() {
/* If the dialog is draggable and the user drags it past the
* right edge of the window, the document becomes wider so we
* need to stretch the overlay. If the user then drags the
* dialog back to the left, the document will become narrower,
* so we need to shrink the overlay to the appropriate size.
* This is handled by shrinking the overlay before setting it
* to the full document size.
*/
var $overlays = $([]);
$.each($.ui.dialog.overlay.instances, function() {
$overlays = $overlays.add(this);
});
$overlays.css({
width: 0,
height: 0
}).css({
width: $.ui.dialog.overlay.width(),
height: $.ui.dialog.overlay.height()
});
}
});