如何检测单个Action类中多个提交按钮场景中单击的提交按钮? [英] How to detect submit button clicked in multiple submit buttons scenario in single Action class?
问题描述
我在jsp中有一个表单。有两个提交按钮:搜索和添加新按钮。
I have a form in a jsp. There are two submit buttons: "Search" and "Add New" button.
<s:form name="searchForm" action="employeeAction" method="post">
<s:textfield name="id" label="Employee ID"/>
<s:textfield name="name" label="Employee Name"/>
<s:submit value="Search"/>
<s:submit value="Add New"/>
</s:form>
在 struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.devMode" value="true" />
<package name="default" namespace="/" extends="struts-default">
<default-action-ref name="index" />
<global-results>
<result name="error">/error.jsp</result>
</global-results>
<global-exception-mappings>
<exception-mapping exception="java.lang.Exception" result="error"/>
</global-exception-mappings>
</package>
<package name="example" namespace="/example" extends="default">
<action name="employeeAction" class="example.EmployeeAction">
<result name="search">/example/search.jsp</result>
<result name="add" type="redirect">/example/add.jsp</result>
</action>
</package>
</struts>
在Struts Action类中,我们知道只有一种处理http请求的方法,即执行()
方法。
In Struts Action class, we know that there is only one method that processing http request, that is execute()
method.
在我预期的情况下,当我点击搜索按钮时,它将执行搜索数据并将数据呈现到 /example/search.jsp
,当我点击添加新按钮时,它将执行重定向页面到 /example/add.jsp
。但是,单击时两个按钮都将进入execute()方法。所以我需要知道如何检测在 execute()
方法中点击的按钮。
In my expected case, when I clicked Search button, it will perform searching data and render data to /example/search.jsp
, when I clicked Add New button, it will perform redirecting page to /example/add.jsp
. However, both buttons when clicked will go into execute() method. So I need to know how to detect which button clicked in the execute()
method.
场景看起来像这个
public class EmployeeAction extends ActionSupport {
public String execute() throws Exception {
//PSEUDOCODE
//IF (submitButton is searchButton)
// return doSearch();
//ELSE IF (submitButton is addNewButton)
// return doAddNew();
return SUCCESS;
}
public String doSearch() throws Exception {
//perform search logic here
return "search";
}
public String doAddNew() throws Exception {
return "add";
}
}
推荐答案
您可以在 struts.xml
文件中定义两个操作,并使用 action
属性< s:提交>
标记以提交不同的操作 http://struts.apache.org/docs/submit.html 。
You can define two actions in struts.xml
file and use action
attribute of <s:submit>
tag in order to submit to different actions http://struts.apache.org/docs/submit.html.
在JSP中:
<s:submit value="Search" action="searchEmployeeAction"/>
<s:submit value="Add New" action="addEmployeeAction"/>
在struts.xml中:
In struts.xml:
<action name="addEmployeeAction" method="add" class="example.EmployeeAction">
<result>/example/add.jsp</result>
</action>
<action name="searchEmployeeAction" method="search" class="example.EmployeeAction">
<result>/example/search.jsp</result>
</action>
在您的操作中创建两个 public String
方法添加
和搜索
。
And in your action create two public String
methods add
and search
.
了解多次提交按钮 http://struts.apache.org/docs/multiple-submit-buttons .html 。
更新
从Struts2版本2.3开始.15.3您需要将 struts.mapper.action.prefix.enabled
常量设置为true才能启用对操作的支持:
前缀。
Starting from Struts2 version 2.3.15.3 you need to set struts.mapper.action.prefix.enabled
constant to true in order to enable support for action:
prefix.
将其放入 struts.xml
文件中:
<constant name="struts.mapper.action.prefix.enabled" value="true" />
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