Custom sort function kendo grid

Question

Can anyone please let me know how can we write our own function in javascript for sorting in kendo grid. And do we need to write two functions for asc and desc?

Any help.. greatly appreciated!

Answer 1

You can do it and you don't have to write two different function for ascending and descending since the only thing that you need to do is providing a compare function for the column field that you need a special algorithm.

Example:

Lets assume that we want to sort a grid by name (a string ) and this is our data:

data    : [
    { id : 1, name : "john" },
    { id : 2, name : "jane" },
    { id : 3, name : "Jane" },
    { id : 4, name : "jack" },
    { id : 5, name : "jane" },
    { id : 6, name : "janette" },
    { id : 7, name : "John" }
],

and the columns definition as:

columns   : [
    { field: "id", title: "id" },
    { field: "name", title: "Name"}
]

What we get is:

id   Name
4    jack
2    jane
5    jane
3    Jane
6    janette
1    john
7    John

As we see we get it sorted alphabetically mixing lower and uppercase but lowercase always come before uppercase.

If we want to sort it first upper and then lowercase (ASCII order), we should define columns.sortable.compare for name as:

columns   : [
    { field: "id", title: "id" },
    { 
        field: "name", 
        title: "Name",
        sortable: {
            compare: function (a, b) {
                return a.name === b.name ? 0 : (a.name > b.name) ? 1 : -1;
            }
        }
    }
]

The compare function receives two items to compare.

Now, what we get is:

id   Name
3    Jane
7    John
4    jack
2    jane
5    jane
6    janette
1    john

You can try it both for ASC and DESC here Simple and neat!