Question

我在asp.net部分视图中执行jQuery $ .ajax函数，以调用控制器操作方法来设置会话变量。

我将创建的var对象字符串化。

如果我使用：

contentType: "application/json",

它没有进入控制器的动作方法，但是

 success: function

返回警报。

我的控制台日志显示对象属性具有值。

为什么它不进入控制器动作方法？

在这种情况下，如果我使用：

contentType: "application/x-www-form-urlencoded; charset=UTF-8",

它确实进入了控制器的动作方法，但是它收到的参数为NULL

但是我的控制台日志显示对象属性具有值。还有

 success: function

返回警报。

为什么输入参数为空？

局部视图：

@model GbngWebClient.Models.LikeOrDislikeVM

<style>
.fa {
    cursor: pointer;
    user-select: none;
}

    .fa:hover {
        color: blue;
    }

/* I added. */
.my-size {
    font-size: 20px;
}

.my-button {
    border: none;
    padding: 8px 10px;
     /* To make the buttons stay on the same line. */
    float: left;
    font-size: 16px;
    margin: 4px 2px;
    background-color: white;
}
</style>

<div class="row">
<div>
    <button class="blogLike my-button fa fa-thumbs-up"><span class="my-size, likeCount"> : @Model.LikeCount </span></button>
    <button class="blogDisLike my-button fa fa-thumbs-down"><span class="my-size, dislikeCount"> : @Model.DisLikeCount</span></button>
</div>
</div>

@Scripts.Render("~/bundles/jquery")
@Scripts.Render("~/bundles/bootstrap")
@Styles.Render("~/Content/css")

<script type="text/javascript">
$(document).ready(function () {
    // For testing:
    console.log('Here at ready. ');

    // JavaScript needs it as 'false'. So using these 'const' to convert them.
    const False = false, True = true;

    // Set the disabled attributes and color.
    SetLike(@Model.LikeDisabled);
    SetDisLike(@Model.DisLikeDisabled);

    // Create the variable in the image of the LikeOrDislikeVM view model.
    var holdLikeOrDislikeVM = {
        BlogId : @Model.BlogId,
        UserId: @Model.UserId,
        LikeCount: @Model.LikeCount,
        DisLikeCount: @Model.DisLikeCount,
        LikeDisabled: @Model.LikeDisabled,
        DisLikeDisabled: @Model.DisLikeDisabled,
    };

    console.log("hold: " + holdLikeOrDislikeVM.BlogId);
    console.log("hold: " + holdLikeOrDislikeVM.UserId);
    console.log("hold: " + holdLikeOrDislikeVM.LikeCount);
    console.log("hold: " + holdLikeOrDislikeVM.DisLikeCount);
    console.log("hold: " + holdLikeOrDislikeVM.LikeDisabled);
    console.log("hold: " + holdLikeOrDislikeVM.DisLikeDisabled);

    $.ajax({
        type: 'POST',
        url: '@Url.Action("SetModelSessionVar", "BlogPublished")',
        data: { likeOrDislikeVM: JSON.stringify(holdLikeOrDislikeVM) },
        //contentType: "application/x-www-form-urlencoded; charset=UTF-8",
        contentType: "application/json",
        success: function (response) {
            alert("Success. Response: " + response);
        },
        error: function (xhr, ajaxOptions, thrownError) {
            alert("Critical Error: something is wrong in the call to SetModelSessionVar! Status: " + xhr.status + ". Error: " + thrownError.toString() + ". Response Text: " + xhr.responseText);
        }
    })
                  

    //--------------------------------------------------------------------------------------
    // Set the disabled attribute to true or false.
    //--------------------------------------------------------------------------------------
    function SetLike(disabledSwitch) {
        // For testing:
        console.log('Here at Setlike. ' + disabledSwitch);

        $(".blogLike").attr('disabled', disabledSwitch);

        if (disabledSwitch == true )
        {
            // Show by color that it was previously liked.
            $(".blogLike").css('color', 'green');
        }

        if (disabledSwitch == false)
        {
            // Show by color that it can be clicked.
            $(".blogLike").css('color', 'black');
        }
    }

    //--------------------------------------------------------------------------------------
     // Set the disabled attribute to true or false.
    //--------------------------------------------------------------------------------------
    function SetDisLike(disabledSwitch) {
        // For testing:
        console.log('Here at SetDisLike. ' + disabledSwitch);

        $(".blogDisLike").attr('disabled', disabledSwitch);

        if (disabledSwitch == true)
        {
            // Show by color that it was previously disliked.
            $(".blogDisLike").css('color', 'green');
        }

        if (disabledSwitch == false)
        {
          // Show by color that it can be clicked.
            $(".blogDisLike").css('color', 'black');
        }
    }
});
</script>

视图模型：

namespace GbngWebClient.Models
{
    public class LikeOrDislikeVM
    {
        public int BlogId { get; set; }
        public int UserId { get; set; }
        public int LikeCount { get; set; }
        public int DisLikeCount { get; set; }
        public bool LikeDisabled { get; set; }
        public bool DisLikeDisabled { get; set; }
    }
}

控制器动作方法：

[HttpPost]
public void SetModelSessionVar(LikeOrDislikeVM likeOrDislikeVM)
{
   // Sets a model session variable according to the argument passed in.
   Session["likeOrDislikeVM"] = likeOrDislikeVM;
}

与自由人-m的讨论中，我发现：

对于以下控制器动作方法：

[HttpPost]
public void SetModelSessionVar(string likeOrDislikeVM)
{
   Session["likeOrDislikeVM"] = likeOrDislikeVM;
}

这是唯一起作用的1（进入控制器方法的方式为：{“ BlogId”：40，“ UserId”：3，“ LikeCount”：0，“ DisLikeCount”：1，“ LikeDisabled”：false，“ DisLikeDisabled“：true}）：

 $.ajax({
     type: 'POST',
     url: '@Url.Action("SetModelSessionVar", "BlogPublished")',
     data: { likeOrDislikeVM: JSON.stringify(holdLikeOrDislikeVM) },
     contentType: "application/x-www-form-urlencoded; charset=UTF-8",
     error: function (xhr, ajaxOptions, thrownError) {
         alert("Critical Error: something");
     }
 })

不起作用（作为空方法进入控制器方法）：

 $.ajax({
     type: 'POST',
     url: '@Url.Action("SetModelSessionVar", "BlogPublished")',
     data: JSON.stringify(holdLikeOrDislikeVM),
     contentType: "application/json",
     error: function (xhr, ajaxOptions, thrownError) {
         alert("Critical Error: something");
     }
 })

不起作用（作为空方法进入控制器方法）：

 $.ajax({
     type: 'POST',
     url: '@Url.Action("SetModelSessionVar", "BlogPublished")',
     data: JSON.stringify(holdLikeOrDislikeVM),
     contentType: "application/x-www-form-urlencoded; charset=UTF-8",
     error: function (xhr, ajaxOptions, thrownError) {
         alert("Critical Error: something");
     }
 })

不起作用（不进入控制器方法，并且在控制台中没有显示）：

 $.ajax({
     type: 'POST',
     url: '@Url.Action("SetModelSessionVar", "BlogPublished")',
     data: { likeOrDislikeVM: JSON.stringify(holdLikeOrDislikeVM)},
     contentType: "application/json",
     error: function (xhr, ajaxOptions, thrownError) {
         alert("Critical Error: something");
     }
 })

现在使用以下控制器动作方法：

[HttpPost]
public void SetModelSessionVar(LikeOrDislikeVM likeOrDislikeVM)
{
   Session["likeOrDislikeVM"] = likeOrDislikeVM;
}

这是唯一起作用的1（作为控制器方法使用：{模型的图像-这是我想要的，而不是上面的字符串）：

 $.ajax({
     type: 'POST',
     url: '@Url.Action("SetModelSessionVar", "BlogPublished")',
     data: { likeOrDislikeVM: holdLikeOrDislikeVM },
     contentType: "application/x-www-form-urlencoded; charset=UTF-8",
     error: function (xhr, ajaxOptions, thrownError) {
         alert("Critical Error: something");
     }
 })

注意：我不得不从在局部视图中定义的视图模型中创建一个JavaScript对象，因为看来我无法将该视图模型传递给controller方法。不知道为什么。我不明白为什么我不能使用视图模型。

使用此局部视图中定义的视图模型传递给controller方法：不起作用（进入控制器方法为：null）：

 $.ajax({
     type: 'POST',
     url: '@Url.Action("SetModelSessionVar", "BlogPublished")',
     data: { likeOrDislikeVM: '@Model' },
     contentType: "application/x-www-form-urlencoded; charset=UTF-8",
     error: function (xhr, ajaxOptions, thrownError) {
         alert("Critical Error: something");
     }
 })

使用此局部视图中定义的视图模型传递给controller方法：不起作用（不进入控制器，控制台显示：未定义GbngWebClient ReferenceError：未定义GbngWebClient）：

 $.ajax({
     type: 'POST',
     url: '@Url.Action("SetModelSessionVar", "BlogPublished")',
     data: { likeOrDislikeVM: @Model},
     contentType: "application/x-www-form-urlencoded; charset=UTF-8",
     error: function (xhr, ajaxOptions, thrownError) {
         alert("Critical Error: something");
     }
 })

asp.net mvc，jQuery / JavaScript-将变量（对象）传递给操作方法

0 个答案: