在 MVC 6 中，如何在视图中编写复选框列表并将选中的值传递给控制器​​? [英] In MVC 6, how to code checkbox list in view and pass the checked values to the controller?

问题描述

抱歉，我的大部分搜索都将我带到旧的 MVC 代码.任何帮助将不胜感激.

在带有标签助手的 MVC 6 中，您如何编写一组复选框:

• 对标签使用标签助手，因此点击它会切换选中的值
• 将选中的值保存(绑定?)到 IsOptionSelected 属性
• 点击提交后将这些检查的值传回控制器

?

我能够正确显示带有标签的复选框，但我不知道如何通过模型将选中的值传递回控制器.现在，IsOptionSelected 值返回为 false.

我还能够使标签帮助程序的 html 帮助程序工作，但不能为标签帮助程序工作.我也可能把这些编码都弄错了，所以任何提示都会有所帮助！

这是我目前所拥有的:

显示:

实体:

公共类PhoneOption{public bool IsOptionSelected { 获取；放;} = 假；公共 int OptionId { 获取；放;}公共字符串 OptionName { 获取；放;}}

型号:

[Display(Name = "Phone Options")]公共 IEnumerable电话选项 { 得到;放;}....PhoneOptions = repository.GetPhoneOptions();

存储库:

public IEnumerable获取电话选项(){IEnumerable选项=新[]{new PhoneOption { OptionId = 1, OptionName = "Phone Case", IsOptionSelected = false },new PhoneOption { OptionId = 2, OptionName = "Screen Protector", IsOptionSelected = false },new PhoneOption { OptionId = 3, OptionName = "Car Charger", IsOptionSelected = false },new PhoneOption { OptionId = 4, OptionName = "Extra Cable", IsOptionSelected = false }};退货选项；}

查看:

<label class="control-label">电话选项</label><div>@foreach(Model.PhoneOptions 中的 var 选项){<div>@{ string cbId = "PhoneOption_" + @option.OptionId;}<input asp-for=@option.IsOptionSelected type="checkbox" value=@option.IsOptionSelected id=@cbId name=@cbId/>@Html.Label(@cbId.ToString(), @option.OptionName)@*这是导致无效操作异常*@@*@option.OptionName*@<span asp-validation-for=@cbId class="text-danger" role="alert"></span>
}

提前致谢！

解决方案

这就是我为了让它工作而最终所做的事情.我不确定这是否是最好的方法.我不得不仍然使用 html 助手，因为标签助手不起作用.

型号:

public List电话选项 { 得到;放;}...PhoneOptions = repository.GetPhoneOptions().ToList();

查看:

@if (@Model.PhoneOptions != null && @Model.PhoneOptions.Count() > 0){for (int i = 0; i <@Model.PhoneOptions.Count(); i++){<div><input asp-for="@Model.PhoneOptions[i].IsOptionSelected" type="checkbox"/><label asp-for="@Model.PhoneOptions[i].IsOptionSelected">@Model.PhoneOptions[i].OptionName</label>@*如果不包括这些，则所有 OptionIds 变为 0，所有 OptionName 变为 null*@@Html.HiddenFor(x => @Model.PhoneOptions[i].OptionId)@Html.HiddenFor(y => @Model.PhoneOptions[i].OptionName)

}}

我希望这可以帮助遇到相同复选框列表问题的其他人.

更新:我已经更新了 html 助手以标记上面的助手.

Sorry but most of my searches take me to old MVC codes. Any help will be appreciated.

In MVC 6 with tag helpers, how do you code a set of checkboxes:

• Use tag helper for label so clicking it will toggle the checked value
• Save (Bind?) the checked value to the IsOptionSelected property
• Pass these checked values back to Controller after clicking Submit

?

I was able to display the checkboxes with labels correctly, but I do not know how to pass the checked values back to the controller via the model. Right now, IsOptionSelected values are coming back as false.

I was also able to make the html helper for the label work but not for the tag helper. I may be also coding these all wrong so any tips will help!

Here's what I have so far:

Display:

Entity:

public class PhoneOption
{
    public bool IsOptionSelected { get; set; } = false;
    public int OptionId { get; set; }
    public string OptionName { get; set; }
}

Model:

[Display(Name = "Phone Options")]
public IEnumerable<PhoneOption> PhoneOptions { get; set; }

. . . .
PhoneOptions = repository.GetPhoneOptions();

Repository:

public IEnumerable<PhoneOption> GetPhoneOptions()
{
    IEnumerable<PhoneOption> options = new[]
    {
        new PhoneOption { OptionId = 1, OptionName = "Phone Case",       IsOptionSelected = false },  
        new PhoneOption { OptionId = 2, OptionName = "Screen Protector", IsOptionSelected = false },
        new PhoneOption { OptionId = 3, OptionName = "Car Charger",      IsOptionSelected = false },
        new PhoneOption { OptionId = 4, OptionName = "Extra Cable",      IsOptionSelected = false }
    };
    return options;
 }

View:

<div class="form-group">
    <label class="control-label">Phone Options</label>
    <div>
        @foreach (var option in Model.PhoneOptions)
        {
            <div>
                @{ string cbId = "PhoneOption_" + @option.OptionId; }
                <input asp-for=@option.IsOptionSelected type="checkbox" value=@option.IsOptionSelected id=@cbId name=@cbId />
                @Html.Label(@cbId.ToString(), @option.OptionName)
                @*This is causing invalid operation exception*@
                @*<label asp-for=@cbId.ToString()>@option.OptionName</label>*@ 
                <span asp-validation-for=@cbId class="text-danger" role="alert"></span>
            </div>
        }
    </div>    
</div>

Thanks in advance!

解决方案

This is finally what I did to make it to work. I am not sure if this is the best way to do it. I had to still use the html helpers because the tag helpers do not work.

Model:

public List<PhoneOption> PhoneOptions { get; set; }
. . .
PhoneOptions = repository.GetPhoneOptions().ToList();

View:

@if (@Model.PhoneOptions != null && @Model.PhoneOptions.Count() > 0)
{
    for (int i = 0; i < @Model.PhoneOptions.Count(); i++)
    {
        <div>
            <input asp-for="@Model.PhoneOptions[i].IsOptionSelected" type="checkbox" />
            <label asp-for="@Model.PhoneOptions[i].IsOptionSelected">@Model.PhoneOptions[i].OptionName</label>

            @*If these are not included, all OptionIds become 0 and all OptionName becomes null*@
            @Html.HiddenFor(x => @Model.PhoneOptions[i].OptionId)
            @Html.HiddenFor(y => @Model.PhoneOptions[i].OptionName)
        </div>
    }    
}

I hope this helps someone else who is having the same checkbox list issues.

UPDATE: I've updated the html helpers to tag helpers above.

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