更新struts2中textfield中的值列表 [英] update a list of value in textfield in struts2

问题描述

我在Struts2中遇到问题，在我的示例应用程序中我有对象数组（说出人名），我需要将这些名称显示为可编辑的文本字段，我正在使用迭代器，我成功地进行了调整，但是当我能够提供相同的价值并提交表格时。我得到了整个数组，它保存了空值。

I am facing a problem in Struts2, In my sample application I have Array of objects (Say person name) , I need to display these names as a editable text fields , I am using Iterators for this , I am successful in diaplying, But When I cange the same value and submit the form. I am getting the entire array which holds null value.

说我的表格bean中的Exaple我有一个属性
名称[]名称;

Say for Exaple in my form bean I have a property Name [] names;

在我的JSP中，我将迭代器设为

In my JSP I have the iterator as

如果有3个名称，那么我可以在UI上获取这些名称可以用一些虚拟值初始化它们，但是当我编辑和汇总时，名称数组没有得到更新。请帮助我这方面

If there are 3 names then I can get these names on the UI if I can initialized them with some dummy value but when I edit and sumbit, then "names" array is not getting updated. Please help me in this regard

推荐答案

在Struts2中，当你需要重新填充bean项列表时，你需要引用它们通过指数。请参考以下示例：

In Struts2, when you need to repopulate the list of bean items, you need to refer them through indices. Please refer the example below:

Bean类：

public class Person {

    private int id;
    private String name;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

行动类：

public class PersonAction extends ActionSupport {
    private List<Person> persons;

    public List<Person> getPersons() {
        return persons;
    }

    public void setPersons(List<Person> persons) {
        this.persons = persons;
    }

    //Initial Load method
    @Override
    public String execute() {
        persons = new ArrayList<Person>();

        int alpha = 65;
        for(int i = 0; i < 3 ; i++) {
            Person person = new Person();
            person.setId(i);
            person.setName(String.valueOf((char)alpha++));
            persons.add(person);
        }
        return SUCCESS;
    }

    //Function that handles the form submit
    public String updatePerson() {

        for(Person person : persons) {
            System.out.println(person.getId() + ":" + person.getName());
        }

        return SUCCESS;
    }
}

页面：

<s:form action="doUpdate">
         <s:iterator value="persons" status="stat" var="person">
              <s:textfield value="%{#person.name}" name="persons[%{#stat.count}].name"/><br/>
         </s:iterator>
         <s:submit value="Submit"/>
</s:form>

当您提交上述表格时，网址看起来像 doUpdate？人[0]。名称= A1&安培;人[1]。名称= B1&安培;人[2]。名称= C1 。同样，如果您需要更新第一个人对象的ID，您将使用表单将 persons [0] .id = 3 附加到网址。在< s：textfield value =％{＃person.name}name =persons [％{#stat.count}]。name/> ，您告诉每个对象，预定义值是人名。 name 属性用于设置渲染的html输入元素;提交表单时将在URL中引用的名称。如果你查看生成的html，你会明白的想法。

When you submit the above form, the url would look like doUpdate?persons[0].name=A1&persons[1].name=B1&persons[2].name=C1. Similarly if you need to update id of the first person object, you will append persons[0].id=3 to the url using form. In the <s:textfield value="%{#person.name}" name="persons[%{#stat.count}].name"/>, you tell that the predefined value is person's name, for each object. The name attribute is to set the rendered html input element; the name which will be referenced in the url when the form is submitted. You will get a clear idea if you look into the generated html.

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