触发下拉更改事件 [英] Trigger change event of dropdown

问题描述

我想在 $(document).ready 中使用 jquery 触发 dropdown 的更改事件.

I want to trigger the change event of dropdown in $(document).ready using jquery.

我在用户详细信息页面中有一个国家和州的级联下拉菜单.如何使用 C# 在 MVC 中设置国家和州的值(根据用户 ID 从数据库中获取).

I have a cascading dropdown for country and state in user details page. how can i set the value (which is taken from DB based on the user id) for country and state in MVC with C#.

推荐答案

我对 JQuery 了解不多，但我听说它允许使用这种语法触发本机事件.

I don't know that much JQuery but I've heard it allows to fire native events with this syntax.

$(document).ready(function(){

    $('#countrylist').change(function(e){
       // Your event handler
    });

    // And now fire change event when the DOM is ready
    $('#countrylist').trigger('change');
});

您必须在调用 trigger() 或 change() 之前声明更改事件处理程序，否则它不会被触发.感谢您提及@LenielMacaferi.

You must declare the change event handler before calling trigger() or change() otherwise it won't be fired. Thanks for the mention @LenielMacaferi.

更多信息这里.

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