Sign in Register
Copied to clipboard

Flag this post as spam?

This post will be reported to the moderators as potential spam to be looked at


  • Paul 18 posts 159 karma points
    Nov 17, 2017 @ 11:46
    Paul
    0

    Passing boolean data into a partial view and using it to conditionally display a class

    Hi all, many thanks in advance for your help.

    In my template view:

    @Html.Partial("HeaderSearchForm", new ViewDataDictionary {{"isExpandable", true}})

    In my HeaderSearchForm.cshtml

    @{
    var isExpandableValue = (bool)ViewData["isExpandable"];
    var isExpandable = (isExpandableValue) ? "-form expandable-search" : "";
}

    I'm getting a nullreference error on line 5

    Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error: 


Line 3:  @{
Line 4:      var thing = (bool)ViewData["isExpandable"];
Line 5:      var isExpandable = (thing) ? "-form expandable-search" : "";
Line 6:  }
Line 7:  

Source File: c:\inetpub\wwwroot\mhshomes\Views\Partials\HeaderSearchForm.cshtml    Line: 5

    Here's the html for reference:

    <form class="[email protected](isExpandable)" role="search" method="POST" action="/Handlers/SiteSearch.ashx">
    <input type="text" value=" " class="search-input" name="search-box" placeholder="Search...">
    <input type="hidden" id="current-node-id" name="current-node-id" value="@Model.Content.Id" />
    <button type="submit" class="search-submit"><i class="fa fa-search"></i></button>
</form>

    Currently migrating the platform to MVC views, learning Umbraco and seeing the end of the tunnel. Exciting times.

    Copy Link
  • Dan Diplo 1505 posts 5911 karma points MVP 4x c-trib
    Nov 17, 2017 @ 13:20
    Dan Diplo
    0

    What does your HeaderSearchForm partial inherit from? It needs to inherit from UmbracoTemplatePage for ViewData to be available, I believe.

    Copy Link
  • Paul 18 posts 159 karma points
    Nov 17, 2017 @ 16:23
    Paul
    0

    Thanks for your reply Dan,

    I do have this at the top of the file

    @inherits Umbraco.Web.Mvc.UmbracoTemplatePage
    Copy Link
  • Dan Diplo 1505 posts 5911 karma points MVP 4x c-trib
    Nov 17, 2017 @ 16:39
    Dan Diplo
    1

    Strange, then it should work, assuming you haven't made any typos. I can't see any reason for it not working!

    But you could try an alternative approach of passing a model to your partial view that has one boolean field. It's a little neater, but requires a bit more code. So you'd need to create a class, similar to:

    public class SearchConfigModel
{
    public bool IsExpandable { get; set; }
}

    Then pass it to your partial:

    @Html.Partial("HeaderSearchForm", new SearchConfigModel() { IsExpandable = true } })

    Then make your partial inherit from UmbracoViewPage:

    @inherits UmbracoViewPage<SearchConfig>

    You can then access Model.IsExpendable in your partial view.

    Copy Link
  • Frans Lammers 34 posts 297 karma points c-trib
    Jun 19, 2019 @ 12:28
    Frans Lammers
    0

    A belated answer, but I got the same problem and found the answer. I thought I'd share it here.

    The default call to a partial:

    @Html.Partial("HeaderSearchForm")

    passes the current model to the partial. You used:

    @Html.Partial("HeaderSearchForm", new ViewDataDictionary {{"isExpandable", true}})

    This however does not pass the model, only the ViewDataDictionary. So to pass them both you need to use a different overload of Html.Partial:

    @Html.Partial("HeaderSearchForm", Model, new ViewDataDictionary {{"isExpandable", true}})
    Copy Link

  • This forum is in read-only mode while we transition to the new forum.

    You can continue this topic on the new forum by tapping the "Continue discussion" link below.

Please Sign in or register to post replies