Asp.net事件生成 [英] Asp.net event generation

问题描述

我有两个下拉列表，一个用于州，另一个用于城市. nw我想当一个人离开国家下拉列表城市时，应该从数据库b中填充bw我可以为这个asp.net控件生成请假事件.
并且仍然可以从客户端脚本(javascript)调用页面的codbehind方法(c#)吗?

i have two dropdownlist one for state and another for city. nw i want when one leaves the country dropdown city should b populated from database hw could i genererate leave event for this asp.net control.

and also is ther anyway to call a codbehind method(c#) of page from client script(javascript)?

推荐答案

1.您可以使用下拉列表属性来附加事件.
DropdownList呈现为"Select".您可以将select的所有属性与下拉列表一起使用.在您的codebehnd文件中，可以说在PageLoad中具有:

1. You can use dropdownlist Attributes in order to attach the event.
DropdownList is rendered as a "Select". You can use all the attributes of a select with dropdown. In your codebehnd file, lets say in PageLoad have:

ddlListCountry.Attributes.Add("onChange", "javascript:DropDownListClientSideOnChange();");

2.关于从客户端脚本调用代码隐藏方法，可以使用 XMLHttpRequest .阅读有关它们的信息.

2. About calling code-behind method from client script, you can use XMLHttpRequest. Read about them.

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