asp.net mvc jquery $.post list<string>

Question

i'm using the following post type:

<% using (Html.BeginForm())
   { %>

<%= Html.Hidden("EligiblePages", Model.EligiblePages) %>

.... no elements in list appear

    $('.btnAction').click(function() {
            $.post("Home/AddProduct", $('form').serialize(), function(retval) { $('#addProductDialog').html(retval); });
    });


public class ProductViewModel
{
    public List<string> EligibleProducts { get; set; }
}


    [AcceptVerbs(HttpVerbs.Post)]
    public ActionResult AddProduct(string sender, ProductViewModel model)
    {
       ...
    }

i'll update this when i get home and can put together a more precise example.

and in my ViewModel that is getting posted i have a list<string> as a hidden input field. for some reason when the post occurs and i inspect the controller post method that field is not coming over correctly. any ideas?

Please include the code for the rest of the view and the controller. Without seeing the hidden values and the controller/viewmodel code we can't really tell you what's going on. — Dismissile
– Dismissile, Commented Oct 17, 2011 at 21:30

Birey · Accepted Answer · 2011-10-17 22:09:21Z

4

<%
for(int i=0;i<Model.EligiblePages.Count;i++)
    Html.HiddenFor(model=>model.EligiblePages[i]);
%>

This would render hidden input elements and would serealize to your model appropriately when then controller function AddProduct gets called.

answered Oct 17, 2011 at 22:09

Birey

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Comments

Dismissile · Accepted Answer · 2011-10-17 21:44:16Z

1

Based on your View Model, I would expect your form elements to look like this:

<input type="hidden" name="EligibleProducts[0]" value="whatever" />
<input type="hidden" name="EligibleProducts[1]" value="whatever" />

etc.

That's what the default model binder is expecting.

answered Oct 17, 2011 at 21:44

Dismissile

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Comments

Russ Cam · Accepted Answer · 2011-10-17 21:40:19Z

The DefaultModelBinder will expect one or more form elements to be posted to bind to the List<string> where the name of each form element matches the name of the list property on the ViewModel. Phil Haack wrote a good blog post about various collection binding approaches.

If you have the entire collection rendered in one hidden input as seems to be suggested in your question, then what will be sent to the browser will just be one value to bind to the list and not a collection of values. You may want to enumerate over the collection and render each value in a hidden input. You could also implement your own model binder to dictate how the posted values are bound to the ViewModel, although that is probably overkill in this case.

What do you see being posted for the collection if you use a HTTP debugging proxy tool like fiddler?

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