我正在尝试将翻转图像添加到我正在处理的测试DotNetNuke页面,但似乎无法使语法正确(对于c#来说是全新的)。对于任何有经验的人来说,这应该是一个简单的,我敢肯定。
到目前为止,我尝试了几种不同的东西,其中大多数会导致对象引用错误。这是我尝试过的最后一件事(请注意下面的代码,我放置了这个,这条线只是在这里,因为这是添加其他属性的地方,我想有一个更合理的地方放线?):
loginLink.Attributes.Add(" onmouseover", "this.src=(http://localhost/portals/_default/skins/BSAVA/Images/Nav/log_in_link_h.png);");
页面加载时没有错误,但翻转不起作用。该链接使用以下属性进行渲染:
onmouseover="this.src=(http://localhost/portals/_default/skins/BSAVA/Images/Nav/log_in_link_h.png);"
显然不正确。
整个页面代码如下:
using System;
using System.Web;
using System.Web.UI;
using DotNetNuke.Common;
using DotNetNuke.Common.Utilities;
using DotNetNuke.Services.Exceptions;
using DotNetNuke.Services.Localization;
using DotNetNuke.UI.Modules;
namespace DotNetNuke.UI.Skins.Controls
{
public partial class Login : SkinObjectBase
{
private const string MyFileName = "Login.ascx";
public string Text { get; set; }
public string CssClass { get; set; }
public string LogoffText { get; set; }
public string login_link_img = "http://localhost/portals/_default/skins/BSAVA/Images/Nav/log_in_link.png";
public string login_link_img_hover = "http://localhost/portals/_default/skins/BSAVA/Images/Nav/log_in_link_h.png";
public string logout_link_img_hover = "http://localhost/portals/_default/skins/BSAVA/Images/Nav/logout_link_h.png";
public string logout_link_img = "http://localhost/portals/_default/skins/BSAVA/Images/Nav/logout_link.png";
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
try
{
if (Request.IsAuthenticated)
{
loginLink.CssClass = "logoutLink";
loginLink.ImageUrl = logout_link_img;
if (!String.IsNullOrEmpty(LogoffText))
{
if (LogoffText.IndexOf("src=") != -1)
{
LogoffText = LogoffText.Replace("src=\"", "src=\"" + PortalSettings.ActiveTab.SkinPath);
}
loginLink.Text = LogoffText;
}
else
{
loginLink.Text = Localization.GetString("Logout", Localization.GetResourceFile(this, MyFileName));
}
loginLink.NavigateUrl = Globals.NavigateURL(PortalSettings.ActiveTab.TabID, "Logoff");
}
else
{
loginLink.CssClass = "loginLink";
loginLink.ImageUrl = login_link_img;
if (!String.IsNullOrEmpty(Text))
{
if (Text.IndexOf("src=") != -1)
{
Text = Text.Replace("src=\"", "src=\"" + PortalSettings.ActiveTab.SkinPath);
}
loginLink.Text = Text;
}
else
{
loginLink.Text = Localization.GetString("Login", Localization.GetResourceFile(this, MyFileName));
}
string returnUrl = HttpContext.Current.Request.RawUrl;
if (returnUrl.IndexOf("?returnurl=") != -1)
{
returnUrl = returnUrl.Substring(0, returnUrl.IndexOf("?returnurl="));
}
returnUrl = HttpUtility.UrlEncode(returnUrl);
loginLink.NavigateUrl = Globals.LoginURL(returnUrl, (Request.QueryString["override"] != null));
if (PortalSettings.EnablePopUps && PortalSettings.LoginTabId == Null.NullInteger)
{
loginLink.Attributes.Add(" onclick", "return " + UrlUtils.PopUpUrl(loginLink.NavigateUrl, this, PortalSettings, true, false, 200, 550));
loginLink.Attributes.Add(" onmouseover", "this.src=(http://localhost/portals/_default/skins/BSAVA/Images/Nav/log_in_link_h.png);");
}
}
}
catch (Exception exc)
{
Exceptions.ProcessModuleLoadException(this, exc);
}
}
}
}
我已经做了很多搜索,有些方法似乎突然出现了一些使用其他JavaScript的方法。非常感谢任何帮助,谢谢。
答案 0 :(得分:0)
我使用这个来实现Image按钮上的RolloverImage效果:
namespace My.Controls
{
/// <summary>
/// Summary description for RolloverImageButton
/// </summary>
[DefaultProperty("Text")]
[ToolboxData("<{0}:RolloverImageButton runat=server></{0}:RolloverImageButton>")]
public class RolloverImageButton : ImageButton
{
[DefaultValue("")]
[UrlProperty]
[Bindable(true)]
public virtual string ImageOverUrl
{
get
{
if (null == ViewState["ImageOverUrl"]) return string.Empty;
else return Convert.ToString(ViewState["ImageOverUrl"]);
}
set { ViewState["ImageOverUrl"] = value; }
}
protected override void AddAttributesToRender(HtmlTextWriter writer)
{
writer.AddAttribute("onmouseover", "this.src='" + base.ResolveClientUrl(ImageOverUrl) + "'");
writer.AddAttribute("onmouseout", "this.src='" + base.ResolveClientUrl(ImageUrl) + "'");
base.AddAttributesToRender(writer);
}
}
}
您可以像在ImageButton中一样在标记中使用它,但您可以另外将ImageOverUrl设置为它。
要使Control全局可用而不在每个页面中包含命名空间,您只需添加对web.config的引用,如下所示:
<system.web>
...
<pages theme="..." controlRenderingCompatibilityVersion="..." clientIDMode="...">
<controls>
<add tagPrefix="mycontrols" namespace="My.Controls" />
</controls>
</pages>
</system.web>
然后,您可以在标记中使用My.Control命名空间中定义的所有控件,如下所示:
<mycontrols:RolloverImageButton runat="server" ImageUrl="~/Images/image1.png" ImageOverUrl="~/Images/image1_h.png" ... />
如果您不希望它成为Button控件,只需覆盖Image类,而不是ImageButton
类,并将其命名为RolloverImage
。您应该拥有一个可以在普通HyperLink中显示的图像标记。
此致 杰拉德