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Adding a new dataview aggregator for count. #1108

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Adding a new dataview aggregator for count. #1108

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25 changes: 24 additions & 1 deletion slick.dataview.js
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,8 @@
Avg: AvgAggregator,
Min: MinAggregator,
Max: MaxAggregator,
Sum: SumAggregator
Sum: SumAggregator,
Count: CountAggregator
}
}
}
Expand Down Expand Up @@ -1120,6 +1121,28 @@
}
}

function CountAggregator(field) {
this.field_ = field;

this.init = function () {
this.sum_ = 0;
};

this.accumulate = function (item) {
var val = item[this.field_];
if (val != null && val !== "") {
this.sum_ += 1
}
};

this.storeResult = function (groupTotals) {
if (!groupTotals.sum) {
groupTotals.sum = {};
}
groupTotals.sum[this.field_] = this.sum_;
}
}

// TODO: add more built-in aggregators
// TODO: merge common aggregators in one to prevent needles iterating

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