60 lines
810 B
JavaScript
60 lines
810 B
JavaScript
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/**
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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.form.row = row;
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value = this._func (this.form);
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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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{
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this.sum -= value;
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this.numbersCount--;
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}
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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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{
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this.sum += value;
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this.numbersCount++;
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}
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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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this.numbersCount = 0;
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}
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,done: function ()
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{
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if (this.numbersCount > 0)
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this.value = this.sum;
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else
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this.value = null;
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}
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});
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