How to change columns set of kendo grid dynamically - kendo-ui

Question

I am trying to change the columns collection of my Kendo grid in the below way.
var grid = $("#grid").data("kendoGrid");
$http.get('/api/GetGridColumns')
.success(function (data) {
grid.columns = data;
})
.error(function (data) {
console.log(data);
});
This is changing the column collection but not reflecting immediately in my grid. But when I try to perform some actions in the grid (like grouping), then my new column set is appearing.
Please let me know how can I achieve this.
Regards,
Dilip Kumar

Answer 1

You can do it by setting the KendoUI datasource, destroy the grid, and rebuild it
$("#load").click(function () {
var grid = $("#grid").data("kendoGrid");
var dataSource = grid.dataSource;
$.ajax({
url: "/Home/Load",
success: function (state) {
state = JSON.parse(state);
var options = grid.options;
options.columns = state.columns;
options.dataSource.page = state.page;
options.dataSource.pageSize = state.pageSize;
options.dataSource.sort = state.sort;
options.dataSource.filter = state.filter;
options.dataSource.group = state.group;
grid.destroy();
$("#grid")
.empty()
.kendoGrid(options);
}
});
});
here you can just do this :
var options = grid.options;
options.columns = state.columns;
where you can retrieve the columns in a session or in a db

Answer 2

This jsfiddle - Kendo UI grid dynamic columns can help you - using kendo.observable.
var columns = data;
var configuration = {
editable: true,
sortable: true,
scrollable: false,
columns: columns //set the columns here
};
var grid = $("#grid").kendoGrid(configuration).data("kendoGrid");
kendo.bind($('#example'), viewModel); //viewModel will be data as in jsfiddle

Answer 3

For the ones who are using Kendo and Angular together, here is a solution that worked for me:
The idea is to use the k-rebind directive. From the docs:
Widget Update upon Option Changes
You can update a widget from controller. Use the special k-rebind attribute to create a widget which automatically updates when some scope variable changes. This option will destroy the original widget and will recreate it using the changed options.
Apart from setting the array of columns in the GridOptions as we normally do, we have to hold a reference to it:
vm.gridOptions = { ... };
vm.gridColumns = [{...}, ... ,{...}];
vm.gridOptions.columns = vm.gridColumns;
and then pass that variable to the k-rebind directive:
<div kendo-grid="vm.grid" options="vm.gridOptions" k-rebind="vm.gridColumns">
</div>
And that's it when you are binding the grid to remote data (OData in my case). Now you can add or remove elements to/from the array of columns. The grid is going to query for the data again after it is recreated.
When binding the Grid to local data (local array of objects), we have to somehow postpone the binding of the data until the widget is recreated. What worked for me (maybe there is a cleaner solution to this) is to use the $timeout service:
vm.gridColumns.push({ ... });
vm.$timeout(function () {
vm.gridOptions.dataSource.data(vm.myArrayOfObjects);
}, 0);
This has been tested using AngularJS v1.5.0 and Kendo UI v2016.1.226.

Answer 4

I'm use this code for change columns dynamic:
kendo.data.binders.widget.columns = kendo.data.Binder.extend({
refresh: function () {
var value = this.bindings["columns"].get();
this.element.setOptions({ columns: value.toJSON });
this.element._columns(value.toJSON());
this.element._templates();
this.element.thead.empty();
this.element._thead();
this.element._renderContent(this.element.dataSource.view());
}
});
Weddin

Answer 5

Refresh your grid
.success(function (data) {
grid.columns = data;
grid.refresh();
})

Answer 6

Here is what i use
var columns = [];//add the columns here
var grid = $('#grid').data('kendoGrid');
grid.setOptions({ columns: columns });
grid._columns(columns);
grid._templates();
grid.thead.empty();
grid._thead();
grid._renderContent(grid.dataSource.view());

Answer 7

I think a solution for what you are asking is to call the equivalent remote DataSource.read() method inside of the function. This is what I used to change the number of columns dynamically for local js data.
$("#numOfValues").change(function () {
var columnsConfig = [];
columnsConfig.push({ field: "item", title: "Metric" });
// Dynamically assign number of value columns
for (var i = 1; i <= $(this).val(); i++) {
columnsConfig.push({ field: ("value" + i), title: ("201" + i) });
}
columnsConfig.push({ field: "target", title: "Target" });
columnsConfig.push({ command: "destroy", title: "" });
$("#grid").data("kendoGrid").setOptions({
columns: columnsConfig
});
columnDataSource.read(); // This is what reloads the data
});

Answer 8

Refresh the grid
$('#GridName').data('kendoGrid').dataSource.read();
$('#GridName').data('kendoGrid').refresh();

Answer 9

Instead of looping through all the elements. we can remove all the data in the grid by using a single statement
$("#Grid").data('kendoGrid').dataSource.data([]);

Answer 10

If your grid is simple and you don't need to configure special column-specific settings, then you can simply omit the columns argument, as suggested in the API reference.
Use autogenerated columns (i.e. do not set any column settings)
... and ....
If this [column] setting is not specified the grid will create a column for every field of the data item.

Answer 11

var newDataSource = new kendo.data.DataSource({data: dataSource}); $("#grid").data("kendoGrid").setDataSource(newDataSource);
$("#grid").data("kendoGrid").dataSource.read();

Answer 12

After fighting this for a day and seeing hints in this thread that Kendo had simplified this problem, I discovered you can just use setOptions with a single property.
.success(function (data) {
grid.setOptions({
columns: data,
});
})
Grid Set Options