JSF 2.0 动态删除组件 [英] JSF 2.0 Dynamically Remove Components

问题描述

作为关于在 JSF 2.0 中动态添加组件的已回答问题的后续(请参阅下面的链接)，我喜欢使用数据表的方法，但是如何删除一个添加的组件呢?

As a follow on to an answered question on Adding Components Dynamically in JSF 2.0 (see link below), I like the approach of using a dataTable, but what about Removing one of the added components?

如何动态添加 JSF 组件

推荐答案

基于 other question 你链接了，你需要做如下修改:

Based on the code snippet in the other question you linked, you need to do the following changes:

1. 向表格中添加带有删除按钮的列.

1. Add a column with a delete button to the table.

<h:column><h:commandButton value="delete" action="#{bean.delete}" /></h:column>

添加DataModel<Item> 属性添加到 bean 并将项目列表包装在其中，以便您能够获取单击按钮的表格行.

Add a DataModel<Item> property to the bean and wrap the list of items in it so that you will be able to obtain the table row where the button was clicked.

private DataModel<Item> model = new ListDataModel<Item>(items);

(别忘了getter，注意你也可以在bean的构造函数或者postconstruct中实例化这个)

改为在数据表中使用它.

Use this in the datatable instead.

<h:dataTable value="#{bean.model}" var="item">

给 bean 添加删除方法.

Add a delete method to the bean.

public void delete() {
    items.remove(model.getRowData());
}

另见:

• @ViewScoped 的好处和缺陷 - 包含 JSF 2.0 CRUD 表示例

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