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Showing content from https://docs.dhtmlx.com/suite/form/api/combo/combo_setvalue_method/ below:

JavaScript Form - setValue Combo Box Method

When the multiselection property of Combo control isn't specified or is set to false, you can set the value of ID as a string, number or array:

const form = new dhx.Form("form_container", {
    rows: [
        {
            name: "combo",
            type: "combo",
            multiselection: false,
            data: [
                { value: "value: 1", id: "id:1" },
                { value: "value: 2", id: "id:2" },
                { value: "value: 3", id: 3 },
                { value: "value: 4", id: 4 },
                { value: "value: 5", id: 5 },
            ]
        },
    ]
});


form.getItem("combo").setValue(4);

If multiselection is enabled, you need to pass to the setValue method an array with string/number values of IDs:

const form = new dhx.Form("form_container", {
    rows: [
        {
            name: "combo",
            type: "combo",
            multiselection: true,
            data: [
                { value: "value: 1", id: "id:1" },
                { value: "value: 2", id: "id:2" },
                { value: "value: 3", id: 3 },
                { value: "value: 4", id: 4 },
                { value: "value: 5", id: 5 },
            ]
        },
    ]
});


form.getItem("combo").setValue(["id:1", 4]);

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