如何选择多个< h：dataTable>行使用< h：selectBooleanCheckbox> [英] How to select multiple rows of <h:dataTable> with <h:selectBooleanCheckbox>

问题描述

我使用< h：dataTable> 列出数据库中的数据。我们在页面上有很多记录，现在我想选择多个记录，每行都有一个复选框。我如何才能实现这一点？

I use <h:dataTable> to list data from database. We have many records in page, now I would like to select multiple records with a checkbox in each row. How can I achieve this?

推荐答案

我认为您的实体设计精良，具有独特的技术标识符，例如DB的自动递增序列。

I assume that your entity is that well-designed that it has an unique technical identifier, for example the auto increment sequence from the DB.

public class Entity {

    private Long id;
    // ...
}

如果没有，你需要添加它。

If not, you'll need to add it.

然后，添加一个 Map< Long，Boolean> 属性到绑定到

Then, add a Map<Long, Boolean> property to the bean which is tied to the table.

private Map<Long, Boolean> checked = new HashMap<Long, Boolean>();

不会为你做;哦，给它一个吸气剂，一个设定者是不必要的）

(preinitialization can also happen in (post)constructor, take your pick, at least JSF won't do it for you; oh, give it a getter as well, a setter is not necessary)

然后，添加一个列与一个复选框它按实体ID映射到布尔值作为键。

Then, add a column with a checkbox which maps to the boolean value by entity ID as key.

<h:dataTable value="#{bean.entities}" var="entity">
    <h:column>
        <h:selectBooleanCheckbox value="#{bean.checked[entity.id]}" />
    </h:column>
    ...
</h:dataTable>
<h:commandButton value="Delete" action="#{bean.delete}" />

现在，在与删除按钮相关联的操作方法中，您可以收集并删除所选项目如下：

Now, in the action method associated with the delete button, you can collect and delete the checked items as follows:

public void delete() {
    List<Entity> entitiesToDelete = new ArrayList<Entity>();

    for (Entity entity : entities) {
        if (checked.get(entity.getId())) {
            entitiesToDelete.add(entity);
        }
    }

    entityService.delete(entitiesToDelete);
    checked.clear();
    loadEntities();
}

这篇关于如何选择多个< h：dataTable>行使用< h：selectBooleanCheckbox>的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！