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How to Effortlessly Create Cascading Dropdowns in ASP.NET MVC 3 with C#?
How to Effortlessly Create Cascading Dropdowns in ASP.NET MVC 3 with C#?
Jan 11, 2025 pm 03:52 PM
Easily create ASP.NET MVC 3 cascading drop-down menu using C#
With updated technology, implementing cascading drop-down menus in ASP.NET MVC 3 is a piece of cake. This guide will walk you through the process, providing clear solutions using C# and the Razor View Engine.
Achieve cascading effect
To create the cascading effect, we first build a model:
<code>public class MyViewModel
{
public int? Year { get; set; }
public int? Month { get; set; }
// ...
}</code>
Next, we define the corresponding controller:
<code>public class HomeController : Controller
{
// ...
public ActionResult Months(int year)
{
// 根據所選年份填充月份的邏輯
// ...
}
}</code>
Populate drop-down menu
In the Razor view we use the following code:
<code>@Html.DropDownListFor(x => x.Year, new SelectList(Model.Years, "Value", "Text"), "-- 選擇年份 --") @Html.DropDownListFor(x => x.Month, Enumerable.Empty(), "-- 選擇月份 --")</code>
We initially populate the "Year" dropdown with a predefined list, while the "Month" dropdown currently remains empty.
Implement cascading behavior
JavaScript code implements cascading effect:
<code>$('#Year').change(function () {
var year = $(this).val();
if (year) {
// AJAX請求，根據所選年份獲取月份
$.getJSON('@Url.Action("Months")', { year: year }, function (months) {
$('#Month').empty();
$.each(months, function (index, month) {
// 使用獲取的數據填充“月份”下拉菜單
});
});
}
});</code>
When a year is selected, this script will trigger an AJAX call to the controller, retrieve the associated month, and update the Month dropdown accordingly.
With this method, you can easily create cascading drop-down menus in ASP.NET MVC 3, providing a smooth user experience.
The above is the detailed content of How to Effortlessly Create Cascading Dropdowns in ASP.NET MVC 3 with C#?. For more information, please follow other related articles on the PHP Chinese website!
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