I'm having some trouble calculating subtotals in a table. Basically I have 3 columns of variables; FRUIT, ORIGIN, and PRICE. FRUIT contains things like "Apple", "Banana", "Orange", etc. I want to populate a table that shows the total price of the FRUIT column clustered by the values in the ORIGIN column. I may be overlooking an easier way of doing this, but here's what I've tried.
for(i=0;i<FRUIT.length;i++)
{
if(ORIGIN[i] == "Africa")
{
SUBTOTAL.push(PRICE[i])
}
}
I then use the following method to allow me place SUBTOTAL.sum() in my table to show the total price of fruit from Africa:
Array.prototype.sum = function() {
for (var j = 0, L = this.length, sum = 0; j < L; sum += this[j++]);
return sum;
The sum method works properly on the full column (for example PRICE.sum()) but I get incorrect subtotals using my current if statement. It also throws off the figures in my table which were previously correct before I added it, such as PRICE.sum().
Any recommendations would be greatly appreciated!
Many Thanks, Karl