如何使用JSTL设置对特定值选中的复选框? [英] How do i set check-boxes checked on particular Value using JSTL?

问题描述

我正在使用JSTL和多个复选框，我只想默认选中一些复选框

I am using JSTL and multiple check-boxes, i just want to checked some check-boxes by default

<form:checkboxes path="userName" items="${UserList}" id="userName" class="check-margin-top"/>

我就是这样

<form:checkboxes path="userName" items="${UserList}" id="userName"class="check-margin-top"
<c:forEach var='list' items="${UserList}"> 
<c:if test="${list == '1'}"checked="checked"></c:if>
</c:forEach>
></form:checkboxes>

我正在获得像这样的UserList {4 = A，11 = DUMMY，9 =测试，5 = John Smith，6 = kp } 我现在想检查9和5，该怎么办?

And i am getting UserList like this { 4 = A,11 = DUMMY,9 = Test,5 = John Smith,6 = kp } i want to keep checked to 9 and 5 now what should i do ?

推荐答案

这是您问题的答案.

生成复选框值的运行时列表，并将其链接到Spring的表单标签<form:checkboxes>

//SimpleFormController...
protected Map referenceData(HttpServletRequest request) throws Exception {

    Map referenceData = new HashMap();
    List<String> userList= new ArrayList<String>();
    webFrameworkList.add("John");
    webFrameworkList.add("Smith");
    webFrameworkList.add("Doe");
    webFrameworkList.add("Peter");
    referenceData.put("userList", userList);

    return referenceData;
}

默认选中... 如果要选中两个复选框，默认情况下值为"John"和"Smith"，则可以使用值"John"和"Smith"初始化"favUser"属性.例如:

Checked by default… If you want to make 2 checkboxes with value "John" and "Smith" are checked by default, you can initialize the "favUser" property with value "John" and "Smith". For example :

//SimpleFormController...
        @Override
protected Object formBackingObject(HttpServletRequest request)
    throws Exception {

    User user = new User();
    user .setFavUser(new String []{"John","Smith"});

    return user ;
}

User.java

User.java

public class User{

    String [] favUser;
    //getter & setter

}

您的复选框应该是

your checkboxes should be

<form:checkboxes items="${userList}" path="favUser" />

注意

<form:checkboxes items="${dynamic-list}" path="property-to-store" />

对于多个复选框，只要"path"或"property"值为 等于任何复选框值– $ {dynamic-list}"， 复选框将被自动选中.

For multiple checkboxes, as long as the "path" or "property" value is equal to any of the "checkbox values – ${dynamic-list}", the matched checkbox will be checked automatically.

来自 https://www.mkyong. com/spring-mvc/spring-mvc-checkbox-and-checkboxes-example/

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