Ajax.ActionLink多次重复相同的GET请求

Question

我正在学习MVC,我正在制作一个简单的SCRUM跟踪系统.

我遇到的问题是,当单击Ajax.ActionLink时,我会对页面上显示的每个scrum卡运行一次相同的ajax操作.

如您所见,我显示了9张卡片,并获得了9张相同的GET请求.(动作链接实际上是卡片右下角的色轮图像).

SingleCard.cshtml(View) - "ColorPicker"是我的动作的名称.

<script src="@Url.Content("~/Scripts/jquery.unobtrusive-ajax.min.js")" type="text/javascript"></script>

...

<div class="card_footer" id="card_footer_id_@(Model.ID)">
    <div class="card_tags">
        [Tag1] [Tag2] [Tag3]
    </div>
    <div class="card_colorwheel_icon">
    @Ajax.ImageActionLink("../Content/Images/color_wheel.png", "Color Wheel", "ColorPicker", new { cardid = Model.ID }, new AjaxOptions { UpdateTargetId = "ColorPickerDisplay" })
    </div>
</div>

ImageActionLink是我正在使用的帮助程序,但它的工作方式与普通的ActionLink完全相同

HomeController.cs(控制器)

    public ActionResult ColorPicker(int cardid)
    {
        var currentcard = db.Cards.Single(x => x.ID == cardid);

        var colors = new List<CardRGB>();
        var cards = db.Cards.ToList();
        foreach (var card in cards)
        {
            colors.Add(new CardRGB 
                {
                    CardId = card.ID,
                    Red = (int)card.BG_Red,
                    Blue = (int)card.BG_Blue,
                    Green = (int)card.BG_Green
                });
        }

        // disctint

        var model = new ColorPickerViewModel()
        {
            Colors = colors,
            Red = (int) currentcard.BG_Red,
            Green = (int) currentcard.BG_Green,
            Blue = (int) currentcard.BG_Blue
        };

        return PartialView(model);
    }

有谁知道为什么这个代码每张卡运行一次？

编辑:按要求!

public static class ImageActionLinkHelper
{
    public static MvcHtmlString ImageActionLink(
        this AjaxHelper helper,
        string imageUrl,
        string altText,
        string actionName,
        object routeValues,
        AjaxOptions ajaxOptions)
        {
            var builder = new TagBuilder("img");
            builder.MergeAttribute("src", imageUrl);
            builder.MergeAttribute("alt", altText);
            builder.MergeAttribute("title", altText);
            var link = helper.ActionLink("[replaceme]", actionName, routeValues, ajaxOptions);
            var html = link.ToHtmlString().Replace("[replaceme]", builder.ToString(TagRenderMode.SelfClosing));
            return new MvcHtmlString(html);
        }
}

Answer 1

检查您网页的HTML.在你的singlecard.cshtml中有一行:

    <script src="@Url.Content("~/Scripts/jquery.unobtrusive-ajax.min.js")" type="text/javascript"></script>

对于每张卡,您再次包含javascript,因此它包含9次.因此,9个请求将被发送到服务器.

解决方案:将脚本包含放在页面级别,而不是卡级别.