有时候会遇到这种情况:在一个表单上需要多个按钮来完成不同的功能,比如一个简单的审批功能。
如果是用webform那不需要讨论,但asp.net mvc中一个表单只能提交到一个Action处理,相对比较麻烦点。
方法一:使用客户端脚本
比如我们在View中这样写:
代码
<
input
type
="submit"
value
="审核通过"
onclick
='this.form.action="<%=Url.Action("Action1")
%
>
/>
< input type ="submit" value ="审核不通过" onclick ='this.form.action="<%=Url.Action("Action2") % > />
< input type ="submit" value ="返回" onclick ='this.form.action="<%=Url.Action("Action3") % > " />
< input type ="submit" value ="审核不通过" onclick ='this.form.action="<%=Url.Action("Action2") % > />
< input type ="submit" value ="返回" onclick ='this.form.action="<%=Url.Action("Action3") % > " />
在点击提交按钮时,先改变Form的action属性,使表单提交到按钮相应的action处理。
但有的时候,可能Action1和2的逻辑非常类似,也许只是将某个字段的值置为1或者0,那么分开到二个action中又显得有点多余了。
方法二:在Action中判断通过哪个按钮提交
在View中,我们不用任何客户端脚本处理,给每个提交按钮加好name属性:
<
input
type
="submit"
value
="审核通过"
name
="action"
/>
< input type ="submit" value ="审核不通过" name ="action" />
< input type ="submit" value ="返回" name ="action" />
< input type ="submit" value ="审核不通过" name ="action" />
< input type ="submit" value ="返回" name ="action" />
然后在控制器中判断:
代码
[HttpPost]
public ActionResult Index( string action /* 其它参数 */ )
{
if (action == " 审核通过 " )
{
//
}
else if (action == " 审核不通过 " )
{
//
}
else
{
//
}
}
public ActionResult Index( string action /* 其它参数 */ )
{
if (action == " 审核通过 " )
{
//
}
else if (action == " 审核不通过 " )
{
//
}
else
{
//
}
}
几年前写asp代码的时候经常用这样的方法…
View变得简单的,Controller复杂了。
太依赖说View,会存在一些问题。假若哪天客户说按钮上的文字改为“通过审核”,或者是做个多语言版的,那就麻烦了。
参考:http://www.ervinter.com/2009/09/25/asp-net-mvc-how-to-have-multiple-submit-button-in-form/
方法三:使用ActionSelector
关于ActionSelector的基本原理可以先看下这个POST使用ActionSelector控制Action的选择。
使用此方法,我们可以将控制器写成这样:
[HttpPost]
[MultiButton( " action1 " )]
public ActionResult Action1()
{
//
return View();
}
[HttpPost]
[MultiButton( " action2 " )]
public ActionResult Action2()
{
//
return View();
}
[MultiButton( " action1 " )]
public ActionResult Action1()
{
//
return View();
}
[HttpPost]
[MultiButton( " action2 " )]
public ActionResult Action2()
{
//
return View();
}
在 View中:
<
input
type
="submit"
value
="审核通过"
name
="action1"
/>
< input type ="submit" value ="审核不通过" name ="action2" />
< input type ="submit" value ="返回" name ="action3" />
< input type ="submit" value ="审核不通过" name ="action2" />
< input type ="submit" value ="返回" name ="action3" />
此时,Controller已经无须依赖于按钮的Value值。
MultiButtonAttribute的定义如下:
代码
public
class
MultiButtonAttribute : ActionNameSelectorAttribute
{
public string Name { get ; set ; }
public MultiButtonAttribute( string name)
{
this .Name = name;
}
public override bool IsValidName(ControllerContext controllerContext,
string actionName, System.Reflection.MethodInfo methodInfo)
{
if ( string .IsNullOrEmpty( this .Name))
{
return false ;
}
return controllerContext.HttpContext.Request.Form.AllKeys.Contains( this .Name);
}
}
{
public string Name { get ; set ; }
public MultiButtonAttribute( string name)
{
this .Name = name;
}
public override bool IsValidName(ControllerContext controllerContext,
string actionName, System.Reflection.MethodInfo methodInfo)
{
if ( string .IsNullOrEmpty( this .Name))
{
return false ;
}
return controllerContext.HttpContext.Request.Form.AllKeys.Contains( this .Name);
}
}
方法四、改进
Thomas Eyde就方法三的方案给出了个改进版:
Controller:
[HttpPost]
[MultiButton(Name = " delete " , Argument = " id " )]
public ActionResult Delete( string id)
{
var response = System.Web.HttpContext.Current.Response;
response.Write( " Delete action was invoked with " + id);
return View();
}
[MultiButton(Name = " delete " , Argument = " id " )]
public ActionResult Delete( string id)
{
var response = System.Web.HttpContext.Current.Response;
response.Write( " Delete action was invoked with " + id);
return View();
}
View:
<
input
type
="submit"
value
="not important"
name
="delete"
/>
< input type ="submit" value ="not important" name ="delete:id" />
< input type ="submit" value ="not important" name ="delete:id" />
MultiButtonAttribute定义:
代码
[AttributeUsage(AttributeTargets.Method, AllowMultiple
=
false
, Inherited
=
true
)]
public class MultiButtonAttribute : ActionNameSelectorAttribute
{
public string Name { get ; set ; }
public string Argument { get ; set ; }
public override bool IsValidName(ControllerContext controllerContext, string
actionName, MethodInfo methodInfo)
{
var key = ButtonKeyFrom(controllerContext);
var keyIsValid = IsValid(key);
if (keyIsValid)
{
UpdateValueProviderIn(controllerContext, ValueFrom(key));
}
return keyIsValid;
}
private string ButtonKeyFrom(ControllerContext controllerContext)
{
var keys = controllerContext.HttpContext.Request.Params.AllKeys;
return keys.FirstOrDefault(KeyStartsWithButtonName);
}
private static bool IsValid( string key)
{
return key != null ;
}
private static string ValueFrom( string key)
{
var parts = key.Split( " : " .ToCharArray());
return parts.Length < 2 ? null : parts[ 1 ];
}
private void UpdateValueProviderIn(ControllerContext controllerContext,
string value)
{
if ( string .IsNullOrEmpty(Argument)) return ;
controllerContext.Controller.ValueProvider[Argument] = new ValueProviderResult
(value, value, null );
}
private bool KeyStartsWithButtonName( string key)
{
return key.StartsWith(Name, StringComparison.InvariantCultureIgnoreCase);
}
}
// 如果是在MVC 2.0中的话,将UpdateValueProviderIn方法改为:
private void UpdateValueProviderIn(ControllerContext controllerContext, string value)
{
if ( string .IsNullOrEmpty(Argument))
return ;
controllerContext.RouteData.Values[ this .Argument] = value;
}
public class MultiButtonAttribute : ActionNameSelectorAttribute
{
public string Name { get ; set ; }
public string Argument { get ; set ; }
public override bool IsValidName(ControllerContext controllerContext, string
actionName, MethodInfo methodInfo)
{
var key = ButtonKeyFrom(controllerContext);
var keyIsValid = IsValid(key);
if (keyIsValid)
{
UpdateValueProviderIn(controllerContext, ValueFrom(key));
}
return keyIsValid;
}
private string ButtonKeyFrom(ControllerContext controllerContext)
{
var keys = controllerContext.HttpContext.Request.Params.AllKeys;
return keys.FirstOrDefault(KeyStartsWithButtonName);
}
private static bool IsValid( string key)
{
return key != null ;
}
private static string ValueFrom( string key)
{
var parts = key.Split( " : " .ToCharArray());
return parts.Length < 2 ? null : parts[ 1 ];
}
private void UpdateValueProviderIn(ControllerContext controllerContext,
string value)
{
if ( string .IsNullOrEmpty(Argument)) return ;
controllerContext.Controller.ValueProvider[Argument] = new ValueProviderResult
(value, value, null );
}
private bool KeyStartsWithButtonName( string key)
{
return key.StartsWith(Name, StringComparison.InvariantCultureIgnoreCase);
}
}
// 如果是在MVC 2.0中的话,将UpdateValueProviderIn方法改为:
private void UpdateValueProviderIn(ControllerContext controllerContext, string value)
{
if ( string .IsNullOrEmpty(Argument))
return ;
controllerContext.RouteData.Values[ this .Argument] = value;
}
