Razor mutliselect下拉设置值，在ASP.NET MVC的多选下拉列表中选择 [英] Razor mutliselect dropdown- set values as selected in the multiselect dropdown in ASP.NET MVC

问题描述

我需要一种方法在Web应用程序的编辑视图中的多选下拉列表中设置已选择的值（ASP.NET，Mvc）



来自视图代码，我将选定的ID传递给选定的值数组。（当我从DB返回值时，将这些值分配给数组然后分配到这里。



我需要一个通过设置选择已选择的值来编辑视图。



请有人建议这样做



谢谢。



我尝试了什么：

I need a way to set already selected values in a multi select dropdown in a edit view in a web application (ASP.NET, Mvc)

from view code,I passed selected ids in to selected values array.(when I return values from DB , assign those in to a array then assign to here.

I need a edit view by set selecting already selected values.

please anyone suggest way to do this

Thank you.

What I have tried:

//View
    <div class="form-group">
    <label>Choose Categories</label>
    @Html.DropDownListFor(model => model.SelectedValues, new MultiSelectList(Models.GetCategoryList().OrderBy(c => c.Value), "Key", "Value"), "Select Category", new { @class = "chzn-select form-control", multiple = "multiple" })                               
    </div>

//Model    
public int[] SelectedValues { get; set; }

//Controller
        public ActionResult Edit(int id)
        {         
            return View(GetDetails(id));
        }

在GetDetails（id）中从DB获取值，并返回一个模型对象

In GetDetails(id) take values from DB , and return a model object

public GetDetails()
{
            int[] arr = new int[2];
            arr[0] = 4;
            arr[1] = 5;
            modelObj.SelectedValues = arr;
.......
......
return modelObj;
}

推荐答案

您需要将所选值传递给 MultiSelectList [ ^ ]构造函数。



使用 ListBoxFor 方法也更为正确，因为你没有渲染下拉列表。 />

You need to pass the selected values to the MultiSelectList[^] constructor.

It would also be more correct to use the ListBoxFor method, since you're not rendering a drop-down list.

@Html.ListBoxFor(model => model.SelectedValues, new MultiSelectList(Models.GetCategoryList().OrderBy(c => c.Value), "Key", "Value", Model.SelectedValues), "Select Category", new { @class = "chzn-select form-control", multiple = "multiple" })

< a href =https://www.mikesdotnetting.com/article/265/asp-net-mvc-dropdownlists-multiple-selection-and-enum-support> ASP.NET MVC DropDownLists - 多项选择a和枚举支持 [ ^ ]

这篇关于Razor mutliselect下拉设置值，在ASP.NET MVC的多选下拉列表中选择的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！