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asp.net - 访问 offsetParent 时 IE 6/7 "Unspecified Error"错误是否有解决方法

转载 作者:行者123 更新时间:2023-12-03 22:37:42 25 4
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我在一个简单的 ASP.NET 概念验证应用程序中使用 jQuery UI 的可拖放库。此页面使用 ASP.NET AJAX UpdatePanel 进行部分页面更新。该页面允许用户将一个项目放入垃圾桶 div 中,这将调用一个回发,从数据库中删除一条记录,然后重新绑定(bind)该项目所在的列表(和其他控件)。所有这些元素(可拖动项和垃圾桶 div)都位于 ASP.NET UpdatePanel 内。

这是拖放初始化脚本:

    function initDragging()
{
$(".person").draggable({helper:'clone'});
$("#trashcan").droppable({
accept: '.person',
tolerance: 'pointer',
hoverClass: 'trashcan-hover',
activeClass: 'trashcan-active',
drop: onTrashCanned
});
}

$(document).ready(function(){
initDragging();

var prm = Sys.WebForms.PageRequestManager.getInstance();
prm.add_endRequest(function()
{
initDragging();
});
});

function onTrashCanned(e,ui)
{
var id = $('input[id$=hidID]', ui.draggable).val();
if (id != undefined)
{
$('#hidTrashcanID').val(id);
__doPostBack('btnTrashcan','');
}

}

当页面回发并部分更新 UpdatePanel 的内容时,我重新绑定(bind)可拖动对象和可放置对象。然后,当我用光标抓取可拖动对象时,我收到“htmlfile:未指定错误”。异常(exception)。我可以通过将 elem.offsetParent 替换为对我编写的此函数的调用来解决 jQuery 库中的此问题:

function IESafeOffsetParent(elem)
{
try
{
return elem.offsetParent;
}
catch(e)
{
return document.body;
}
}

我还必须避免调用 elem.getBoundingClientRect(),因为它会引发相同的错误。对于那些感兴趣的人,我只需在 Dimensions Plugin 中的 jQuery.fn.offset 函数中进行这些更改。 .

我的问题是:

  • 虽然这可行,但是否有更好的方法(更干净;更好的性能;无需修改 jQuery 库)来解决这个问题?
  • 如果不是,当我将来更新 jQuery 库时,管理保持更改同步的最佳方法是什么?例如,我可以将库扩展到其他地方,而不仅仅是内联到从 jQuery 网站下载的文件中。

更新:

@some 它不是公开访问的,但我会看看 SO 是否会让我将相关代码发布到这个答案中。只需创建一个 ASP.NET Web 应用程序(将其命名为 DragAndDrop)并创建这些文件。不要忘记将 Complex.aspx 设置为起始页。您还需要下载jQuery UI drag and drop plug in以及jQuery core

复杂.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Complex.aspx.cs" Inherits="DragAndDrop.Complex" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
<script src="jquery-1.2.6.min.js" type="text/javascript"></script>
<script src="jquery-ui-personalized-1.5.3.min.js" type="text/javascript"></script>
<script type="text/javascript">
function initDragging()
{
$(".person").draggable({helper:'clone'});
$("#trashcan").droppable({
accept: '.person',
tolerance: 'pointer',
hoverClass: 'trashcan-hover',
activeClass: 'trashcan-active',
drop: onTrashCanned
});
}

$(document).ready(function(){
initDragging();

var prm = Sys.WebForms.PageRequestManager.getInstance();
prm.add_endRequest(function()
{
initDragging();
});
});

function onTrashCanned(e,ui)
{
var id = $('input[id$=hidID]', ui.draggable).val();
if (id != undefined)
{
$('#hidTrashcanID').val(id);
__doPostBack('btnTrashcan','');
}

}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
<asp:UpdatePanel ID="updContent" runat="server" UpdateMode="Always">
<ContentTemplate>
<asp:LinkButton ID="btnTrashcan" Text="trashcan" runat="server" CommandName="trashcan"
onclick="btnTrashcan_Click" style="display:none;"></asp:LinkButton>
<input type="hidden" id="hidTrashcanID" runat="server" />
<asp:Button ID="Button1" runat="server" Text="Save" onclick="Button1_Click" />
<table>
<tr>
<td style="width: 300px;">
<asp:DataList ID="lstAllPeople" runat="server" DataSourceID="odsAllPeople"
DataKeyField="ID">
<ItemTemplate>
<div class="person">
<asp:HiddenField ID="hidID" runat="server" Value='<%# Eval("ID") %>' />
Name:
<asp:Label ID="lblName" runat="server" Text='<%# Eval("Name") %>' />
<br />
<br />
</div>
</ItemTemplate>
</asp:DataList>
<asp:ObjectDataSource ID="odsAllPeople" runat="server" SelectMethod="SelectAllPeople"
TypeName="DragAndDrop.Complex+DataAccess"
onselecting="odsAllPeople_Selecting">
<SelectParameters>
<asp:Parameter Name="filter" Type="Object" />
</SelectParameters>
</asp:ObjectDataSource>
</td>
<td style="width: 300px;vertical-align:top;">
<div id="trashcan">
drop here to delete
</div>
<asp:DataList ID="lstPeopleToDelete" runat="server"
DataSourceID="odsPeopleToDelete">
<ItemTemplate>
ID:
<asp:Label ID="IDLabel" runat="server" Text='<%# Eval("ID") %>' />
<br />
Name:
<asp:Label ID="NameLabel" runat="server" Text='<%# Eval("Name") %>' />
<br />
<br />
</ItemTemplate>
</asp:DataList>
<asp:ObjectDataSource ID="odsPeopleToDelete" runat="server"
onselecting="odsPeopleToDelete_Selecting" SelectMethod="GetDeleteList"
TypeName="DragAndDrop.Complex+DataAccess">
<SelectParameters>
<asp:Parameter Name="list" Type="Object" />
</SelectParameters>
</asp:ObjectDataSource>
</td>
</tr>
</table>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</form>
</body>
</html>

Complex.aspx.cs

namespace DragAndDrop
{
public partial class Complex : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}

protected List<int> DeleteList
{
get
{
if (ViewState["dl"] == null)
{
List<int> dl = new List<int>();
ViewState["dl"] = dl;

return dl;
}
else
{
return (List<int>)ViewState["dl"];
}
}
}

public class DataAccess
{
public IEnumerable<Person> SelectAllPeople(IEnumerable<int> filter)
{
return Database.SelectAll().Where(p => !filter.Contains(p.ID));
}

public IEnumerable<Person> GetDeleteList(IEnumerable<int> list)
{
return Database.SelectAll().Where(p => list.Contains(p.ID));
}
}

protected void odsAllPeople_Selecting(object sender, ObjectDataSourceSelectingEventArgs e)
{
e.InputParameters["filter"] = this.DeleteList;
}

protected void odsPeopleToDelete_Selecting(object sender, ObjectDataSourceSelectingEventArgs e)
{
e.InputParameters["list"] = this.DeleteList;
}

protected void Button1_Click(object sender, EventArgs e)
{
foreach (int id in DeleteList)
{
Database.DeletePerson(id);
}

DeleteList.Clear();
lstAllPeople.DataBind();
lstPeopleToDelete.DataBind();
}

protected void btnTrashcan_Click(object sender, EventArgs e)
{
int id = int.Parse(hidTrashcanID.Value);
DeleteList.Add(id);
lstAllPeople.DataBind();
lstPeopleToDelete.DataBind();
}
}
}

数据库.cs

namespace DragAndDrop
{
public static class Database
{
private static Dictionary<int, Person> _people = new Dictionary<int,Person>();
static Database()
{
Person[] people = new Person[]
{
new Person("Chad")
, new Person("Carrie")
, new Person("Richard")
, new Person("Ron")
};
foreach (Person p in people)
{
_people.Add(p.ID, p);
}
}

public static IEnumerable<Person> SelectAll()
{
return _people.Values;
}

public static void DeletePerson(int id)
{
if (_people.ContainsKey(id))
{
_people.Remove(id);
}
}

public static Person CreatePerson(string name)
{
Person p = new Person(name);
_people.Add(p.ID, p);

return p;
}
}

public class Person
{
private static int _curID = 1;
public int ID { get; set; }
public string Name { get; set; }
public Person()
{
ID = _curID++;
}

public Person(string name)
: this()
{
Name = name;
}
}
}

最佳答案

@arilanto - 我在 jquery 脚本之后包含此脚本。从性能角度来看,这不是最好的解决方案,但它是一个快速简单的解决方案。

function IESafeOffsetParent(elem)
{
try
{
return elem.offsetParent;
}
catch(e)
{
return document.body;
}
}

// The Offset Method
// Originally By Brandon Aaron, part of the Dimension Plugin
// http://jquery.com/plugins/project/dimensions
jQuery.fn.offset = function() {
/// <summary>
/// Gets the current offset of the first matched element relative to the viewport.
/// </summary>
/// <returns type="Object">An object with two Integer properties, 'top' and 'left'.</returns>

var left = 0, top = 0, elem = this[0], results;

if ( elem ) with ( jQuery.browser ) {
var parent = elem.parentNode,
offsetChild = elem,
offsetParent = IESafeOffsetParent(elem),
doc = elem.ownerDocument,
safari2 = safari && parseInt(version) < 522 && !/adobeair/i.test(userAgent),
css = jQuery.curCSS,
fixed = css(elem, "position") == "fixed";

// Use getBoundingClientRect if available
if (false && elem.getBoundingClientRect) {
var box = elem.getBoundingClientRect();

// Add the document scroll offsets
add(box.left + Math.max(doc.documentElement.scrollLeft, doc.body.scrollLeft),
box.top + Math.max(doc.documentElement.scrollTop, doc.body.scrollTop));

// IE adds the HTML element's border, by default it is medium which is 2px
// IE 6 and 7 quirks mode the border width is overwritable by the following css html { border: 0; }
// IE 7 standards mode, the border is always 2px
// This border/offset is typically represented by the clientLeft and clientTop properties
// However, in IE6 and 7 quirks mode the clientLeft and clientTop properties are not updated when overwriting it via CSS
// Therefore this method will be off by 2px in IE while in quirksmode
add( -doc.documentElement.clientLeft, -doc.documentElement.clientTop );

// Otherwise loop through the offsetParents and parentNodes
} else {

// Initial element offsets
add( elem.offsetLeft, elem.offsetTop );

// Get parent offsets
while ( offsetParent ) {
// Add offsetParent offsets
add( offsetParent.offsetLeft, offsetParent.offsetTop );

// Mozilla and Safari > 2 does not include the border on offset parents
// However Mozilla adds the border for table or table cells
if ( mozilla && !/^t(able|d|h)$/i.test(offsetParent.tagName) || safari && !safari2 )
border( offsetParent );

// Add the document scroll offsets if position is fixed on any offsetParent
if ( !fixed && css(offsetParent, "position") == "fixed" )
fixed = true;

// Set offsetChild to previous offsetParent unless it is the body element
offsetChild = /^body$/i.test(offsetParent.tagName) ? offsetChild : offsetParent;
// Get next offsetParent
offsetParent = offsetParent.offsetParent;
}

// Get parent scroll offsets
while ( parent && parent.tagName && !/^body|html$/i.test(parent.tagName) ) {
// Remove parent scroll UNLESS that parent is inline or a table to work around Opera inline/table scrollLeft/Top bug
if ( !/^inline|table.*$/i.test(css(parent, "display")) )
// Subtract parent scroll offsets
add( -parent.scrollLeft, -parent.scrollTop );

// Mozilla does not add the border for a parent that has overflow != visible
if ( mozilla && css(parent, "overflow") != "visible" )
border( parent );

// Get next parent
parent = parent.parentNode;
}

// Safari <= 2 doubles body offsets with a fixed position element/offsetParent or absolutely positioned offsetChild
// Mozilla doubles body offsets with a non-absolutely positioned offsetChild
if ( (safari2 && (fixed || css(offsetChild, "position") == "absolute")) ||
(mozilla && css(offsetChild, "position") != "absolute") )
add( -doc.body.offsetLeft, -doc.body.offsetTop );

// Add the document scroll offsets if position is fixed
if ( fixed )
add(Math.max(doc.documentElement.scrollLeft, doc.body.scrollLeft),
Math.max(doc.documentElement.scrollTop, doc.body.scrollTop));
}

// Return an object with top and left properties
results = { top: top, left: left };
}

function border(elem) {
/// <summary>
/// This method is internal.
/// </summary>
/// <private />
add( jQuery.curCSS(elem, "borderLeftWidth", true), jQuery.curCSS(elem, "borderTopWidth", true) );
}

function add(l, t) {
/// <summary>
/// This method is internal.
/// </summary>
/// <private />
left += parseInt(l, 10) || 0;
top += parseInt(t, 10) || 0;
}

return results;
};

关于asp.net - 访问 offsetParent 时 IE 6/7 "Unspecified Error"错误是否有解决方法,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/371468/

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