I am trying to pass a model to the controller using an ajax post, but every time I do so, the model is null and I lose all the data I am trying to persist.
The ajax call:
$('#next').click(function (e) {
e.preventDefault();
var url = '@Url.Action("Manage")'
var _model = JSON.stringify(@Html.Raw(Json.Encode(Model)));
var _page = @(Model.pager.CurrentPage + 1);
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: url,
data: JSON.stringify({ 'model': _model, 'page': _page }),
success: function(result) {
console.log(result);
}
});
});
When I look at the serialized object, it looks like a correctly formatted JSON object with no errors thrown in the developer console.
The link that is triggering this jQuery call is just a basic action link:
@Html.ActionLink(">", "Manage", "Announcements", null, new { id = "next" })
My model is a little more complicated...
public class ManageViewModel : IEnumerable<EditViewModel>
{
[Display(Name="Start Date")]
[DataType(DataType.DateTime)]
public DateTime? StartDate { get; set; }
[Display(Name="End Date")]
[DataType(DataType.DateTime)]
public DateTime? EndDate { get; set; }
public string SearchString { get; set; }
public Pager pager { get; set; }
public List<EditViewModel> Data { get; set; }
public List<CategoryViewModel> Categories { get; set; }
public ManageViewModel()
{
Data = new List<EditViewModel>();
Categories = new List<CategoryViewModel>();
}
public IEnumerator<EditViewModel> GetEnumerator()
{
return Data.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return Data.GetEnumerator();
}
}
public class Pager
{
public int TotalItems { get; private set; }
public int CurrentPage { get; private set; }
public int PageSize { get; private set; }
public int TotalPages { get; private set; }
public int StartPage { get; private set; }
public int EndPage { get; private set; }
public Pager(int totalItems, int? page, int pageSize = 10)
{
int totalPages = (int)Math.Ceiling((decimal)totalItems / (decimal)pageSize);
int currentPage = page ?? 1;
int startPage = currentPage - 5;
int endPage = currentPage + 4;
if(startPage <= 0)
{
endPage -= (startPage - 1);
startPage = 1;
}
if(endPage > totalPages)
{
endPage = totalPages;
if(endPage > 10)
{
startPage = endPage - 9;
}
}
TotalItems = totalItems;
TotalPages = totalPages;
CurrentPage = currentPage;
PageSize = pageSize;
EndPage = endPage;
StartPage = startPage;
}
}
I can't convert the links in to a form because that breaks the pagination. Or maybe I'm just not understanding the full picture here.
Here is the section of the View where the pagination is occurring
if (Model.pager.EndPage > 1)
{
<div style="color:#337AB7; padding-bottom: 0px;">Page @Model.pager.CurrentPage of @Model.pager.TotalPages</div>
<ul class="pagination">
@if (Model.pager.CurrentPage > 1)
{
<li>
@Html.ActionLink("<<", "Manage", new { model = Model, start = Model.StartDate, end = Model.EndDate, query = Model.SearchString }, null)
</li>
<li>
@Html.ActionLink("<", "Manage", new { model = Model, page = Model.pager.CurrentPage - 1, start = Model.StartDate, end = Model.EndDate, query = Model.SearchString }, null)
</li>
}
@for (var _page = Model.pager.StartPage; _page < Model.pager.EndPage + 1; _page++)
{
<li class="@(_page == Model.pager.CurrentPage ? "active" : "")">
@Html.ActionLink(_page.ToString(), "Manage", new { model = Model, page = _page, start = Model.StartDate, end = Model.EndDate, query = Model.SearchString }, null)
</li>
}
@if (Model.pager.CurrentPage < Model.pager.TotalPages)
{
<li>
@Html.ActionLink(">", "Manage", "Announcements", null, new { id = "next" })
</li>
<li>
@Html.ActionLink(">>", "Manage", new { model = Model, page = Model.pager.TotalPages, start = Model.StartDate, end = Model.EndDate, query = Model.SearchString }, null)
</li>
}
</ul>
}
The action links attempting to pass the model, obviously don't work but I left them because I am focusing on getting one to work, the one listed previously, before getting all the others configured.
I have looked at the following SO posts and have had no luck with them:
Post an MVC model with AJAX?
Model properties null on Ajax post from list box change event
How to send a model in jQuery $.ajax() post request to MVC controller method
Pass Model To Controller using Jquery/Ajax
How to pass model in ajax post request?
Any ideas on how I might be able to do this? I need the model data to persist for searching/filtering which is done through a form. Thank you in advance for taking a look and giving your insights!
