You can use the onload event handler to test that specific fields (on which the update panel depends) are populated.

您可以使用onload事件处理程序测试该特定字段（更新面板所依赖的字段）是否已填充。

youdao

You can use the onload event handler to test that specific fields (on which the update panel depends) are populated.

您可以使用onload事件处理程序测试该特定字段（更新面板所依赖的字段）是否已填充。

youdao