Simple jqgrid Delete in MVC - asp.net-mvc

Question

I've been trawling across the web for answers, and maybe it's a case of it being more complicated than I expect (or I just don't understand the solutions), but I am looking for a way to simply delete a selected row from my jqgrid by clicking the trash icon.
Currently my grid is being populated with Linq to SQL data.
Here is my grid:
jQuery("#grid").jqGrid({
url: '<%= ResolveUrl("~/Home/GetData") %>',
datatype: "json",
mtype: 'GET',
postData: { DDLid: function () { return jQuery("#DDL option:selected").val(); } },
colNames: ['Col1', 'Col2'],
colModel: [
{ name: 'Col1', index: 'Col1', width: 200, editable: false },
{ name: 'Col2', index: 'Col2', width: 200, editable: false }
],
jsonReader: {
repeatitems: false
},
rowNum: 10,
pager: jQuery('#gridpager'),
sortname: 'Type',
viewrecords: true,
sortorder: "asc",
caption: "Table"
}).navGrid('#gridpager', { del: true, add: false, edit: false, search: false }, {}, {}, {url: "Delete"});
Now the 'id' in post data is NOT the primary key in this table - I just need it to help populate the grid.
What I would like to get is the selected row id and pass it to the Delete method, but I can't find any way to do that.
I have tried using jQuery("#grid").getGridParam('selrow') in the postData but it always returns null.
Any help would be greatly appreciated.
Here is my delete method, for reference:
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Delete(int DDLid)
{
int row = Convert.ToInt32(/*I NEED THIS ID*/);
var query = from x in _ctx.DataTable
where ((x.id == row))
select x;
_ctx.DataTable.DeleteOnSubmit(query.Single());
_ctx.SubmitChanges();
return Json(true);
}
This method is called and is fine, but I am getting the wrong id. I need the selected row's id. This breaks because the DDLid returns more than one row (since it is used to populate the grid).
I hope that makes sense.

Answer 1

I discovered where I would pass the selected index (but then I realised I was looking for the primary key, rather than selected index, but it is the same result regardless)
I needed to add this to my navGrid:
{url: "Delete", mtype: "POST", reloadAfterSubmit: true,
serializeDelData: function (postdata) {
var selectedrowindex = jQuery("#grid").jqGrid('getGridParam', 'selrow');
var dataFromCellByColumnIndex = jQuery('#grid').jqGrid ('getCell', selectedrowindex , 1);
return {DDLid: postdata.id, name: dataFromCellByColumnIndex};
}
});
So this passes a column value to my delete method as well as the DDLid, but I could easily swap dataFromCellByColumnIndex with selectedrowindex.

Answer 2

You should just implement Delete action having id parameter:
public JsonResult Delete(string id) {
...
}
To reference the action in the JavaScript code I would use 'url: <%= Url.Action("Delete") %>' instead of url: "Delete" which you use currently.
You can download here demo project which I created for the answer. The project implement deleting of the row together with many other features which you currently not need.

Answer 3

You can make another post inside delete method with your own params. After defining grid, you can define each action in detail. It is posting actual delete with correctid and original one is posting fake id. JQgrid is using row count for delete not the primary key. They may change it with recent versions, but this was working Jqgrid 3.8
jQuery("#ClientGrid").jqGrid('navGrid', '#ClientGridPager',
{ view: true, edit: true, search: false }, //options
{height: 240, caption: 'Edit Client', beforeShowForm: hideIDColumn, reloadAfterSubmit: true, mtype: 'POST', url: "/Settings/EditClient", jqModal: false, closeOnEscape: true, bottominfo: "Fields marked with (*) are required" }, // edit options
{height: 340, caption: 'Add Client', beforeShowForm: hideIDColumn, reloadAfterSubmit: true, mtype: 'POST', url: "/Settings/CreateClient", jqModal: false, closeOnEscape: true, bottominfo: "Fields marked with (*) are required", closeAfterAdd: true }, // add options
//delete method
{reloadAfterSubmit: true, beforeSubmit: function (postdata, formid)
{
var lastselectedID = -1;
if (ClientGridrow != null || typeof (ClientGridrow) != "undefined")
{
lastselectedID = $("#ClientGrid").getCell(ClientGridrow, 'ID_PK');
}
//CUSTOME delete to send taskid instead of rowid
$.ajax({ type: "POST", url: "/Settings/DeleteClient/?objid=" + lastselectedID,
data: "", success: function (response)
{
$("#ClientGrid").trigger("reloadGrid"); //reloadAfterSubmit: true is not working in Chrome
}
});
return [true, "Delete failed message"];
}, caption: 'Delete Client', datatype: 'local', url: "/Settings/DeleteClient/?objid=-1", jqModal: false, closeOnEscape: true
}, // del options..we make two posts
{closeOnEscape: true }, // search options
{height: 230, width: 350, jqModal: false, closeOnEscape: true} // view options
);