Question

I have a simple foreach template and inside every element I want an ActionLink but that ActionLink needs to send an Id to edit the element.

The item to be templated:

<div data-bind="template: {
                    name: 'postsTemplate',
                    foreach: posts
                    }">
</div>

The template:

<script id="postsTemplate" type="text/html">
<h2 data-bind="text: Title"></h2>

<p class="post-info">
    <p class="post-info" data-bind="text UserName"></p>
    <span data-bind="Body"></span>
    <p class="post-footer">
        @Html.ActionLink("Comments", "IndividualPost", "Post", null, null, "comments", new {id = })
    </p>
</p>
</script>

How can I send the actual post Id through the ActionLink? I mean, How I can access to the post’s id without using data-bind? (Because it’s a helper).

Answer 1

If you would implement your own ActionLink extension along the line of:

public static MvcHtmlString ActionLink(this HtmlHelper htmlHelper, string linkText,
                                       string actionName, string controllerName,
                                       object routeValues,  bool noEncode)
    {
        var urlHelper = new UrlHelper(htmlHelper.ViewContext.RequestContext);
        var url = urlHelper.Action(actionName, controllerName, routeValues);

        if (noEncode) url = Uri.UnescapeDataString(url);

        var tagBuilder = new TagBuilder("a");

        tagBuilder.MergeAttribute("href", url);
        tagBuilder.InnerHtml = linkText;

        return MvcHtmlString.Create(tagBuilder.ToString(TagRenderMode.Normal));
    }

Then you could make your template like:

<p class="post-info">
    <p class="post-info" data-bind="text UserName"></p>
    <span data-bind="Body"></span>
    <p class="post-footer">
        @Html.ActionLink("Comments (${CommentCount})", "IndividualPost", "Post", 
                         new {id = "${id}"}, true)
    </p>
</p>

the serverside html generated would then look like:

<p class="post-info">
    <p class="post-info" data-bind="text UserName"></p>
    <span data-bind="Body"></span>
    <p class="post-footer">
       <a href="/Post/IndividualPost/${id}">Comments (${CommentCount})</a>
    </p>
</p>

which in turn is a perfect template in my opinion.

The reason for an ActionLink extension is the fact that the normal Html.ActionLink encodes your url to /Post/IndividualPost/%24%7Bid%7D which doesn’t work for the template