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用HttpHandler给Asp.net 1.1加入OnClientClick

点击次数:1670  更新日期:2010-12-30
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大家用Asp.net 1.1的时候,对asp:button加入客户端的onclick事件,要在code-behind里利用Button的Attributes集合,加入,例如:
this.Button1.Attributes["onclick"] = “return test();”;


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说来惭愧,没出Asp.net 2.0的时候,虽然觉得这么做有点麻烦,但也没想着要去改进它,直到asp.net 2.0出现,看到了在2.0里,多了OnClientClick这个属性,简化了上面1.1时的做法。


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其实,在1.1下面,可以用HttpHandler来达到简化onclick的功能。在这个Handler里,遍历页面的每个控件,发现它存在OnClientClick的Attribute时,就给控件加一个onclick的Attribute,然后在web.config里配置所有的aspx页面用这个HttpHandler处理,这样就达到了我们简化onclick的目的,使asp.net 1.1也支持OnClientClick。


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using System.Collections;
using System.Web;
using System.Web.Compilation;
using System.Web.SessionState;
using System.Web.UI;
namespace ZSoft.Web.Controller
{

class AspNet1ExtendHandler : IHttpHandler, IRequiresSessionState
{
IHttpHandler 成员#region IHttpHandler 成员


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public bool IsReusable
{
get { return false; }
}


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public void ProcessRequest(HttpContext context)
{
string url = context.Request.Path;
IHttpHandler h = PageParser.GetCompiledPageInstance(url,context.Server.MapPath(url),context);
(h as Page).PreRender += new EventHandler(ctx_PreRender);


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context.Handler = h;
// 交由Asp.net默认的Handler处理
h.ProcessRequest(context);
}


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#endregion


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private void ctx_PreRender(object sender, EventArgs e)
{
Extend(sender as Page);
}


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private void Extend(System.Web.UI.Control control)
{
string script = GetAttribute(control,”OnClientClick”);
if(script != null)
{
AddAttribute(control,”onclick“,script);
}
foreach(Control child in control.Controls)
{
Extend(child);
}
}
private string GetAttribute(Control control,string keyword)
{
if(control is WebControl)
{
return (control as WebControl).Attributes[keyword];
}
if (control is HtmlControl)
{
return (control as HtmlControl).Attributes[keyword];
}
}


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private void AddAttribute(Control control, string key, string value)
{
string oldValue = GetAttribute(control, key);


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if (oldValue != null)
{
if (oldValue.IndexOf(value) != -1) oldValue = oldValue.Remove(oldValue.IndexOf(value), value.Length);
if (!oldValue.EndsWith(“;”) && oldValue != “”) oldValue += “;”;
}
value = oldValue + value;
if (control != null)
{
if (control is WebControl)
{
WebControl webCtrl = control as WebControl;
webCtrl.Attributes.Add(key, value);
}
if (control is HtmlControl)
{
HtmlControl htmlCtrl = control as HtmlControl;
htmlCtrl.Attributes.Add(key, value);
}
}
}


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}
}


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来源:http://www.cnblogs.com/northdevil

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