50 lines
666 B
JavaScript
50 lines
666 B
JavaScript
/**
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* Computes a sum of data in the model.
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**/
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Db.CalcSum = new Class
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({
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Extends: Db.Calc
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,Tag: 'db-calc-sum'
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,getRowValue: function (row)
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{
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var value;
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if (this._func)
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{
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this._set.row = row;
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value = this._func (this._set);
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}
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else
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value = this._model.getByIndex (row, this.columnIndex);
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return value;
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}
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,before: function (row)
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{
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var value = this.getRowValue (row)
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if (value !== null)
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this._sum -= value;
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}
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,after: function (row)
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{
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var value = this.getRowValue (row);
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if (value !== null)
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this._sum += value;
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}
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,init: function ()
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{
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this._sum = 0;
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}
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,done: function ()
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{
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this.value = this._sum;
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}
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});
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