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:
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< input type = "submit" value = "审核通过" onclick=' this.form.action = "<%=Url.Action(" Action1") %>";' /> |
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< input type = "submit" value = "审核不通过" onclick=' this.form.action = "<%=Url.Action(" Action2") %>";' /> |
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< 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:
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< input type = "submit" value = "审核通过" name = "action" /> |
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< input type = "submit" value = "审核不通过" name = "action" /> |
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< input type = "submit" value = "返回" name = "action" /> |
然后在控制器中判断:
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public ActionResult Index( string action ) |
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else if (action== "审核不通过" ) |
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。
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[MultiButton( "action1" )] |
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public ActionResult Action1() |
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[MultiButton( "action2" )] |
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public ActionResult Action2() |
在 View中:
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< input type = "submit" value = "审核通过" name = "action1" /> |
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< input type = "submit" value = "审核不通过" name = "action2" /> |
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< 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:
Thomas Eyde就方法三的方案给出了个改进版:
Controller:
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[MultiButton(Name = "delete" , Argument = "id" )] |
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public ActionResult Delete( string id) |
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var response = System.Web.HttpContext.Current.Response; |
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response.Write( "Delete action was invoked with " + id); |
View:
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< input type = "submit" value = "not important" name = "delete" /> |
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< input type = "submit" value = "not important" name = "delete:id" /> |
MultiButtonAttribute定义:
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[AttributeUsage(AttributeTargets.Method, AllowMultiple = false , Inherited = true )] |
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public class MultiButtonAttribute : ActionNameSelectorAttribute |
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public string Name { get ; set ; } |
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public string Argument { get ; set ; } |
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public override bool IsValidName(ControllerContext controllerContext, string actionName, MethodInfo methodInfo) |
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var key = ButtonKeyFrom(controllerContext); |
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var keyIsValid = IsValid(key); |
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UpdateValueProviderIn(controllerContext, ValueFrom(key)); |
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private string ButtonKeyFrom(ControllerContext controllerContext) |
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var keys = controllerContext.HttpContext.Request.Params.AllKeys; |
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return keys.FirstOrDefault(KeyStartsWithButtonName); |
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private static bool IsValid( string key) |
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private static string ValueFrom( string key) |
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var parts = key.Split( ":" .ToCharArray()); |
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return parts.Length < 2 ? null : parts[1]; |
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private void UpdateValueProviderIn(ControllerContext controllerContext, string value) |
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if ( string .IsNullOrEmpty(Argument)) return ; |
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controllerContext.Controller.ValueProvider[Argument] = new ValueProviderResult(value, value, null ); |
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private bool KeyStartsWithButtonName( string key) |
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return key.StartsWith(Name, StringComparison.InvariantCultureIgnoreCase); |
如果是在MVC 2.0中的话,将UpdateValueProviderIn方法改为:
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private void UpdateValueProviderIn(ControllerContext controllerContext, string value) |
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if ( string .IsNullOrEmpty(Argument)) |
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controllerContext.RouteData.Values[ this .Argument] = value; |