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// 컬럼 설정시 합계 식 지정
gridView.setColumns([{
    ...
}, {
    "fieldName": "QuantityPerUnit",
    "footer": {
        "text": "합계 =>"
    }
}, {
    "fieldName": "Quantity",
    },
    "footer": {
        "styles": {
            "textAlignment": "far",
            "numberFormat": "#,##0",
            "suffix": " $",
            "font": "Arial,12"
            },
        "text": "합계",
        "expression": "sum",
        "groupExpression": "sum"
    }
}, {
    ...
}];

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  gridView.setOptions({"summaryMode" : "statistical"});

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  gridView.setOptions({"summaryMode" : "aggregate"});

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  gridView.setOptions({"summaryMode" : "none"});