JSF:将字符串添加到列表 [英] JSF: Adding a String to List
问题描述
我有一个JSF 2.0应用程序,该应用程序具有一个保存字符串列表的bean.
I have an JSF 2.0 application that has a bean that holds a list of Strings.
我想将<h:inputText>/>
中的字符串添加到我的列表中并显示我的列表.
I want to add the String from an <h:inputText>/>
to my List and display my list.
以下代码只是将引用放入我的列表中.因此,列表中的每个元素都设置为最后一个输入.
The following code just put references in my List. So every element from my List is set to the last input.
@ManagedBean
@ApplicationScoped
public class Bean {
private String name;
private ArrayList<String> test = new ArrayList<String>();
public Bean() {
}
public Bean(String name) {
this.name = name;
}
public String addtoList(String _name){
test.add(_name);
return "./index.xhtml";
}
/***************GETTER/SETTER/HASHCODE/EQUALS**************************/
...
}
这是我的index.xhtml的一部分:
here a part of my index.xhtml:
<h:inputText id="name"
value="#{bean.name}"
required="true">
</h:inputText>
<h:commandButton value="Post"
action="#{bean.addtoList(name)}"/>
<br/>
<h:dataTable var="bean"
value="#{bean.test}">
<h:column>
<h:outputText value="#{bean.name}"/>
</h:column>
</h:dataTable>
推荐答案
尝试一下:
public String addtoList() { // no parameter
test.add(this.name); // add value of bean's property
return "./index.xhtml";
}
和在方面:
<h:commandButton
value="Post"
action="#{bean.addtoList}"/> <!-- no parameter passed -->
关键是要使用不带参数的addToList
方法,并且添加到列表中的字符串应该是后备bean的name
属性的值.
The point is to have the addToList
method without parameters and the string you add to the list should be the value of the name
property of the backing bean.
而且,在数据表中,不要将var
命名为与支持bean相同的名称.这令人困惑,并可能导致错误.使用类似这样的内容:
And also, in the datatable, do not name the var
the same as the backing bean. It's confusing and potentially leads to bugs. Use something like this:
<h:dataTable
var="it"
value="#{bean.test}">
<h:column>
<h:outputText value="#{it}" />
</h:column>
</h:dataTable>
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