Get Checkboxlist selected lookup value and update the list using SPServices

Question

I have a CheckBoxList in which there is a Lookup values. Now I need the selected values and update it to the Lookup column in the list using SPServices. I tried the below code:

var selectedValues = [];
 $("[id*=chbxPAD] input:checked").each(function () {
        selectedValues.push($(this).next().html());
    });
 $().SPServices({
    operation: "UpdateListItems",
    listName: "Requirements",
    ID: id,
    valuepairs: [
                 ["Request_x0020_Type", selectedValues]
                ],

    completefunc: function (xData, Status) {
        alert("Updated.");
        }
   });

Answer 1

SharePoint lookup consist of 2 parts: ID of the item in the list and the Value. You can't set lookup only by the value because they are not the unique and can be the same with another item in this list. You should specify ID of the selected element.

Answer 2

Lookup Column needs to be treated differently.

The value pair should be like

valuepairs: [
             ["Request_x0020_Type", ["1;#Test1","2;#Test2"]]
            ],

Where 1 & 2 are corresponding ID values of Test1 and Test2.