是否有“全选"?Vaadin 13 Grid 中的 checkbok(即使在过滤条件下也能工作，甚至当某些数据不在缓存中时?) [英] is there a "Select All" checkbok in Vaadin 13 Grid (that works even with filter conditions & when even some of the data is NOT in the cache?)

问题描述

在 Vaadin 13 中，我为我的网格启用了多选"，效果很好.然而，通常，即使经过过滤，我也有数百个项目(因此选择每个项目会很乏味).在我多年前使用的旧 gwt网格"工具中，他们有一个复选框，该复选框将出现在顶行/标题级别，如果选中，将对表中的所有行执行全选/取消全选(之后过滤).Vaadin 13 中是否存在这样的解决方案?如果没有，是否有任何(简单且安全的)解决方法来实现类似的目标?(注意:这可能比看起来要复杂一些，因为全选/取消全选复选框应该选择所有项目甚至，如果它们没有被显示或者甚至在后端缓存中....它应该根据过滤条件选择所有记录....)

解决方案

Grid 默认不显示全选"；当您使用内存中没有所有项目的数据提供程序时，请选中复选框.这样做的原因是它有可能给大型数据库带来很多麻烦.您仍然可以通过执行以下操作来显式启用它:

<预><代码>导入 com.vaadin.flow.component.grid.Grid;导入 com.vaadin.flow.component.grid.Grid.SelectionMode;导入 com.vaadin.flow.component.grid.GridMultiSelectionModel;导入 com.vaadin.flow.component.grid.GridMultiSelectionModel.SelectAllCheckboxVisibility;((GridMultiSelectionModel) grid.getSelectionModel()).setSelectAllCheckboxVisibility(SelectAllCheckboxVisibility.VISIBLE);

参见 https://github.com/vaadin/vaadin-grid-flow/issues/549 了解更多详情.

In Vaadin 13, I have enabled "multiselect" for my grids, which works great. However, often, even after filtering, I have hundreds of items (so selecting each of them would be tedious). In an old old gwt "grid" tool I used years ago, they had a checkbox that would appear on the top row/header level that, if selected, would do a select all/unselect all for all the rows in the table (after filtering). Does such a solution exist in Vaadin 13? If not, any (easy and safe) workaround to achieve something similar? (Note: It may be a little trickier to do than it first seems, since the select all/unselect all checkbox should select all items even if they're not being displayed or even in the back-endcache....it should select all records based on the filter condition....)

解决方案

Grid does by default not show a "Select all" checkbox when you're using a data provider that doesn't have all items in memory. The reason for this is that it has the potential of causing lots of trouble with a big database. You can still explicitly enable it by doing something like this:

import com.vaadin.flow.component.grid.Grid;
import com.vaadin.flow.component.grid.Grid.SelectionMode;
import com.vaadin.flow.component.grid.GridMultiSelectionModel;
import com.vaadin.flow.component.grid.GridMultiSelectionModel.SelectAllCheckboxVisibility;

((GridMultiSelectionModel<?>) grid.getSelectionModel())
    .setSelectAllCheckboxVisibility(SelectAllCheckboxVisibility.VISIBLE);

See https://github.com/vaadin/vaadin-grid-flow/issues/549 for more details.

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