In this article we'll talk about the chaining of select also called select cascade. It is a procedure that we often find on the web and it consists in giving the user the possibility to find a specific data through a few passages: practically choosing a category in the first select, the second one will be populated with the results related with the category selected. We imagine, for example, a first select where it is possible to choose between motorcycles and cars; once we selected the car category , the second select will be populated with the brands of the cars available. Then selecting a brand, the third select will be populated with the models available of this brand. In this article we’ll see a very simple example but it will give us the basis to comprehend the procedure to do even in the case of more complicated cascades.