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checkbox使用
registerForm1.jsp
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ taglib prefix="tr" uri="http://www.springframework.org/tags/form" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>注册</title>
</head>
<body>
<form:form modelAttribute="user" method="post" action="">
<table>
<tr>
<td>选择课程：</td>
<td>
<form:checkbox path="courses" value="JAVAEE" label="JAVAEE"/>
<form:checkbox path="courses" value="Mybatis" label="Mybatis"/>
<form:checkbox path="courses" value="Spring" label="Spring"/>
</td>
</tr>
</table>
<form:checkbox path="reader"/>已经阅读相关协议
</form:form>
</body>
</html>
CheckBoxController
package com.wen.controller;
import com.wen.domain.User111;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import java.util.ArrayList;
import java.util.List;
@Controller
public class CheckBoxController {
@RequestMapping(value = "/registerForm1", method = RequestMethod.GET)
public String registerForm1(Model model){
User111 user111=new User111();
user111.setReader(true);
List<String> list=new ArrayList<>();
list.add("JAVAEE");
list.add("Spring");
user111.setCourses(list);
model.addAttribute("user",user111);
return "registerForm1";
}
}
CheckBoxes的使用
CheckBoxesController
package com.wen.controller;
import com.wen.domain.User111;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import java.util.ArrayList;
import java.util.List;
@Controller
public class CheckBoxesController {
@RequestMapping(value = "/checkboxesForm",method = RequestMethod.GET)
public String registerForm222(Model model){
User111 user111=new User111();
List<String> list=new ArrayList<>();
list.add("JAVAEE");
list.add("Spring");
user111.setCourses(list);
List<String> courseList=new ArrayList<>();
courseList.add("JAVAEE");
courseList.add("Mybatis");
courseList.add("Spring");
model.addAttribute("user",user111);
model.addAttribute("courseList",courseList);
return "checkboxesForm";
}
}
checkboxesForm.jsp
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form:form modelAttribute="user">
<table>
<tr>
<td>选择课程：</td>
<td>
<form:checkboxes path="courses" items="${courseList}"/>
</td>
</tr>
</table>
</form:form>
</body>
</html>
我们可以看到label和value的值一致，
那么，如果我们需要让checkboxes的值不一致，我们需要怎么做呢？
我们可以使用Map作为数据源~
Map作为checkboxes的items属性的数据源时，Map集合的key将作为复选框的value，Map集合的value将作为label进行显示。
判断items，Map中是否含有对应的key来决定当前的复选框是否处于选中状态。
CheckBoxes2Controller
package com.wen.controller;
import com.wen.domain.User111;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@Controller
public class CheckBoxes2Controller {
@RequestMapping(value = "/checkboxesForm2", method = RequestMethod.GET)
public String checkboxesForm2(Model model) {
User111 user111=new User111();
List<String> list=new ArrayList<>();
list.add("1");
list.add("3");
user111.setCourses(list);
Map<String,String> courseMap=new HashMap<>();
courseMap.put("1","JAVAEE");
courseMap.put("2","Mybatis");
courseMap.put("3","Spring");
model.addAttribute("user",user111);
model.addAttribute("courseMap",courseMap);
return "checkboxesForm2";
}
}
这样我们发现，现在的input中的value就是map中的key了~
当我们使用Array或者集合作为数据源的使用，且里面的元素都是一个domain对象时，还可以使用checkboxes标签的itemLabel和itemValue属性来表示。
CheckBoxes3Controller
package com.wen.controller;
import com.wen.domain.Dept;
import com.wen.domain.Employee;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import java.util.ArrayList;
import java.util.List;
@Controller
public class CheckBoxes3Controller {
@RequestMapping(value = "/checkboxesForm3", method = RequestMethod.GET)
public String checkboxesForm2(Model model) {
//页面checkbox复选框这一项会被选中
Employee employee = new Employee();
Dept dept = new Dept(1, "开发部");
List<Dept> list = new ArrayList<>();
list.add(dept);
employee.setDepts(list);
//页面展现的可供选择的复选框内容
List<Dept> deptList = new ArrayList<>();
deptList.add(dept);
deptList.add(new Dept(2, "销售部"));
deptList.add(new Dept(3, "财务部"));
model.addAttribute("employee", employee);
model.addAttribute("deptList", deptList);
return "checkboxesForm3";
}
}
checkboxesForm3.jsp
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form:form modelAttribute="employee">
<table>
<tr>
<td>
选择部门：
</td>
<td>
<form:checkboxes path="depts" items="${deptList}" itemLabel="name" itemValue="id"/>
</td>
</tr>
</table>
</form:form>
</body>
</html>
我们可以看到，Dept对象的name就是label标签，id就是input的value值~