Persist the State of the Grid alongside the Function Handlers

Environment

Product

Progress® Telerik UI for ASP.NET Core Grid

Description

By default, the JSON.stringify() method cannot serialize function definitions. Event handlers and other similar Grid configurations are lost when the state of the component is persisted with getOptions and setOptions.

How can I persist the state of the Data Grid and include the function definitions in the saved options?

Solution

To achieve the desired scenario, implement a custom JSON reviver parameter, which can serialize and deserialize the function definitions.

<script>
    $(document).ready(function () {
        $("#save").click(function (e) {
            e.preventDefault();
            var grid = $("#grid").data("kendoGrid");
            localStorage["kendo-grid-options"] = kendo.stringify(grid.getOptions());
        });

        $("#load").click(function (e) {
            e.preventDefault();
            var grid = $("#grid").data("kendoGrid");
            var options = localStorage["kendo-grid-options"];
            if (options) {
                var parsedOptions = JSON.parse(options)
                // Add the function reference
                parsedOptions.columns[0].command[0].click = showDetails;
                grid.setOptions(parsedOptions);
            }
        });
    });

    function showDetails(e) {
        e.preventDefault();
        var dataItem = this.dataItem($(e.currentTarget).closest("tr"));
        console.log(dataItem);
    }
</script>

<div class="box wide">
    <button href="#" class="k-button k-button-md k-rounded-md k-button-solid k-button-solid-primary" id="save">Save State</button>
    <button href="#" class="k-button k-button-md k-rounded-md k-button-solid k-button-solid-primary" id="load">Load State</button>
</div>
<br />
@(Html.Kendo().Grid<TelerikMvcApp9.Models.OrderViewModel>()
            .Name("grid")
            .Columns(columns =>
            {
                columns.Command(command => command.Custom("View Details").Click("showDetails")).Width(180);
                columns.Bound(p => p.OrderID).Filterable(false);
                columns.Bound(p => p.Freight);
                columns.Bound(p => p.OrderDate).Format("{0:MM/dd/yyyy}");
                columns.Bound(p => p.ShipName);
                columns.Bound(p => p.ShipCity);
            })
            .Pageable()
            .Sortable()
            .Scrollable()
            .Filterable()
            .Groupable()
            .HtmlAttributes(new { style = "height:550px;" })
            .DataSource(dataSource => dataSource
                .Ajax()
                .PageSize(20)
                .Read(read => read.Action("Orders_Read", "Grid"))
            )
        )