Allow multiple rows in footer table

[flack]

There are some situations where it would be nice if we could have more than one row in the footer table, e.g. when you have an invoice table like this:

Item	Price
Item 1	20
Item 2	25
---------
Sum	45
VAT	5
Total	50

[OlegKi]

It's possible to implement. The old answer provide the corresponding implementation example. One can provide more comfortable feature to create multiline footer, but one should make detailed suggestion about the new options which can be easy to understand and to use.

[flack]

@OlegKi: Do you think we would need new options for this? I would imagine we could change the code so that userdata and footerdata accept arrays of rows. Something like this:

$('#grid').jqGrid({
    //...
}).jqGrid("footerData", "set", [{/* footer row 1 */}, {/* footer row 2 */}]);