Spring Mvc提交/删除表中的已检查（选定）记录

Z时代
2024-01-10
分类：问答

我正在尝试从表格中提交选定的项目，并对它们进行一些修改，但无法正常工作。

MyObject.java

public class MyObject{
    boolean checkControl = true; //default true
    private String name;
    private String code;
    //getters & setters
}

MyObjectForm.java

public class MyObjectForm {
    private List<MyObject> myList;
    public List<MyObject> getMyList() {
        return myList;
    }
    public void setMyList(List<MyObject> myList) {
        this.myList= myList;
    }
}

list-myObjects.jsp

<form:form action="submitList" method="post" modelAttribute="myObjectForm">
    <table>
        <tbody>
            <c:forEach items="${myObjectForm.myList}" var="row" varStatus="status">
        <tr>
                <td>
                    <spring:bind path="myList[${status.index}].checkControl">
                    <input type="checkbox" value="<c:out value="${status.value}"/>" name="isChecked" <c:if test="${row.checkControl}"> checked="checked" </c:if> />
                    </spring:bind>
                    </td>
                    <td>${row.name}</td>
                    <td>${row.code}</td>
            </tr>
        </c:forEach>
        </tbody>
    </table>  
    <button type="submit">Submit</button>
</form:form>

和控制器

@RequestMapping(value = "/submitList", method = RequestMethod.POST)
public String save(@ModelAttribute("myObjectForm") MyObjectForm myObjectForm, Model model) {
    List<MyObject> selectedtList = myObjectForm.getMyList(); //returns null
    if (selectedtList == null) {
        System.out.println("no objects selected");
    }
    else {
        //Make some computation
    }
    model.addAttribute("resultArray", selectedtList);
    return "display-items";
}

回答：

听起来像一个具有约束力的问题。您是否尝试过使用Spring的<form:checkbox>标签而不是<spring:bind>？它会自动生成复选框属性，并添加一个Spring用来确定该复选框是“打开”还是“关闭”的隐藏字段。

<form:form action="submitList" method="post" modelAttribute="myObjectForm">
    <table>
        <tbody>
            <c:forEach items="${myObjectForm.myList}" var="row" varStatus="status">
        <tr>
                <td>
                    <form:checkbox path="myList[${status.index}].checkControl"/>
                    </td>
                    <td>${row.name}</td>
                    <td>${row.code}</td>
            </tr>
        </c:forEach>
        </tbody>
    </table>  
    <button type="submit">Submit</button>
</form:form>