更改某些内容后如何刷新vaadin网格? [英] How to refresh the vaadin Grid after you change something?

问题描述

我有一个Vaadin网格可供使用.我发出放置请求以更新网格中元素的分数.我想知道如何在更新后使网格响应以显示新信息.现在，我必须刷新整个页面以显示新信息.

I have a Vaadin grid that I use. I make a put request to update the scores of the elements in the grid. I was wondering how to make the grid respond after the update to show the new information. Right now I have to refresh the entire page to show the new information.

我不确定要发布什么代码，如果有帮助，我正在使用基本的vaadin网格.

I'm not sure what code I would post, I'm using a basic vaadin grid if that helps.

推荐答案

通过对网格进行更改，我不确定您的意思，但是我想您正在使用setItems还是数据提供程序?

I am not completely sure with what you mean by putting changes to the grid, but I suppose you are using setItems or a data provider?

首先，您需要:

Grid<MyItem> grid = new Grid(MyItem.class);
grid.setItems(someItems);

第二秒钟，您将编写:

Grid<MyItem> grid = new Grid(MyItem.class);
grid.setDataProvider(...);

第二种方法是，您可以使用Java 8表示法指定数据提供程序，如下所示:

For the second way you can either specify the data provider using Java 8 notation as in:

grid.setDataProvider(
  (sortOrders, offset, limit) -> {//e.g. call to repo }, 
  () -> { // count provider, e.g. repo.count() });

或如下所示:

grid.setDataProvider(new ListDataProvider<>(myDataCollection));

要提出这个问题，在两种情况下，您都可以调用以下方法获取提供者:

To come to the question, in both cases you can call following to get the provider:

DataProvider<MyItem> provider = grid.getDataProvider();

要更新一个特定元素，数据提供者将提供方法

To update one specific element, the data provider provides the method

provider.refreshItem(item);

重要的是MyItem类必须实现getId()方法或equals().如果不是这种情况，则可以调用provider.refreshAll()

Important to know is that the MyItem class has to implement a getId() method, or, alternatively, equals(). If this is not the case, you can invoke provider.refreshAll()

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