How can I access the model for the selected item i

问题:

I have a selectable kendoUI grid in my ASP.NET MVC app. How do I get the strongly typed model object for the selected item? I have tried the following code but it doesn't work.

@(Html.Kendo().Grid<Backup>(Model.Backups)
    .Name("MatchingBackupsGrid")
    .Columns(col =>
        {
            col.Bound(backup => backup.BackupUId).Title("UID");
            col.Bound(backup => backup.BackupFirstName).Title("First Name");
            col.Bound(backup => backup.BackupLastName).Title("Last Name");
        })
        .Scrollable()
        .Selectable(sel =>
        {
            sel.Mode(GridSelectionMode.Single);
            sel.Type(GridSelectionType.Row);
        })
         .DataSource(dataSource => dataSource
            .Server()
            .Read(read => read.Action("SearchForBackup", "Arr", new { lastName = Model.SearchTerm }))
            .Model(model => model.Id(backup => backup.BackupUId))
         )
    )

function SelectBackupButtonClickHandler() {

    var grid = $("#MatchingBackupsGrid").data("kendoGrid");

    var selectedBackup = grid.dataItem(grid.select());

    console.log(selectedBackup);
}

回答1:

Grid row selection responds to the Kendo change event.

@(Html.Kendo().Grid<Backup>(Model.Backups)
    .Name("MatchingBackupsGrid")
    .Columns(col =>
        {
            col.Bound(backup => backup.BackupUId).Title("UID");
            col.Bound(backup => backup.BackupFirstName).Title("First Name");
            col.Bound(backup => backup.BackupLastName).Title("Last Name");
        })
        .Scrollable()
        .Selectable(sel =>
        {
            sel.Mode(GridSelectionMode.Single);
            sel.Type(GridSelectionType.Row);
        })
         .DataSource(dataSource => dataSource
            .Server()
            .Read(read => read.Action("SearchForBackup", "Arr", new { lastName = Model.SearchTerm }))
            .Model(model => model.Id(backup => backup.BackupUId))
         )
    )
<script>
function SelectBackupButtonClickHandler() {
    var selectedBackup = this.dataItem(this.select());
    console.log(selectedBackup);
}

$("#MatchingBackupsGrid").data("kendoGrid").bind("change", SelectBackupButtonClickHandler);
</script>

回答2:

When you're using client-side code, you can only access client-side data; you can't access the strongly typed model using grid.dataItem(). If you want to do that, you'll need to send the item's id to the server, e.g. using an AJAX request, and continue your work there; so you'll have to do something like this:

function SelectBackupButtonClickHandler() {
    var grid = $("#MatchingBackupsGrid").data("kendoGrid");
    var selectedBackup = grid.dataItem(grid.select());
    var id = selectedBackup.id;

    $.ajax({
       type: "POST",
       url: yourUrl, // post to your controller action that does what you want to do with the model
       dataType: "json",
       data: { id: id } 
    };
}

回答3:

With kendoHelpers you can get the selected item's dataItem

// Get the grid
var grid = $('#SampleGrid').data('kendoGrid');

// Call your desired function
var dataItem = kendoHelpers.grid.getSelectedDataItem(grid);

// Manipulate the results
if (dataItem != null){
    // dataItem.MyId = ...
}

The other method which is getSelectedDataItemByCurrentCell doesn't require the grid to be selectable and works on the active cell.

The library also has many other helper functions.

回答4:

I have no idea what it was that I was doing earlier, my code is working now.

I tried so many things -- I assumed for some reason that grid.select() returns an array, so I tried to apply an indexer to get the first element of the array like so:

var selectedBackups = grid.select();

// strangely, the Visual Studio intellisense mislead 
// me here as it showed me the model properties on 
// indexing this array
selectedBackups[0].BackupFirstName;

I also tried a transformation on the array like so:

var names = $.map(grid.select(), function(item)
{
    return item.BackupFirstName + ' ' + item.BackupLastName;
});

I was in between so many ideas I was trying that I forgot to check that my original code did actually have a strongly typed model of the selected row.

So, just for the record, the code in the question is correct, and it is reproduced below. To get the selected item in a single selection mode KendoUI grid, do the following:

var grid = $("#MatchingBackupsGrid").data("kendoGrid");

// this is a single object and not an array
// this is your strongly typed model object
var selectedBackup = grid.dataItem(grid.select());

console.log(selectedBackup);