Web Product SKU (specification) selection

What is SKU

Wikipedia , the smallest inventory unit (keeping), is sometimes called items as a SKU in a chain retail store, defined as the smallest available unit for holding inventory control, such as
For example: the iphone has specifications: Color "red, gold, black", Memory Size "32g, 64g, 128g" Red +32g is a SKU, of course, can also be divided into a more detailed

background data is as follows: (table 1)

Color	Memory	Screen Size	Stock
Red-A1	16g-b1	4.7-c1	100
Golden-A2	32g-b2	5.1-c2	110
Black-a3	64g-b3	4.7	120
Blue-A4	128g-b4	4.7	130

For the above data permutation combination gets, all the inventory SKU

The tabs are: (Table 2)

Color	Select Item
Color	Red	Golden	Black	Blue
Memory	16G	32G	64G	128G
Screen	4.7	5.1

Product Requirements Show optional styles only with inventory buttons

Tab

Store the selected SKU in an array such as: SELECTSKU=[A1,B1,C1]

Programme 1:

Generate a map of all the specification permutations, such as:

skumap={
    a1:100,
    b1:100,
    c1:220,

}

The advantage is that only one operation is required, the latter only need to search through the key, but the initialization of the operation is relatively large

Programme 2:

Each time you choose to recalculate the inventory for the current option, such as:

selectsku=[a1,b1,c1];//has selected the specification
//If you want to know if C2 can choose, you need to obtain the inventory
/other analogy of KEY=A1B1C2 this SKU

Here thank you very much for a piece of article, write a very carefully. Interested can refer to the
Http://git.shepherdwind.com/sku-search-algorithm.html