pipomenace pipomenace -4 years ago 146
Javascript Question

Javascript Increment by more than 1?

Here's my script :

//event handler for item quantity in shopping cart
function itemQuantityHandler(p, a) {
//get current quantity from cart
var filter = /(\w+)::(\w+)/.exec(p.id);
var cart_item = cart[filter[1]][filter[2]];
var v = cart_item.quantity;


//add one
if (a.indexOf('add') != -1) {
if(v < settings.productBuyLimit) v++;
}
//substract one
if (a.indexOf('subtract') != -1) {
if (v > 1) v--;

}
//update quantity in shopping cart
$(p).find('.item-quantity').text(v);
//save new quantity to cart
cart_item.quantity = v;
//update price for item
$(p).find('.item-price').text((cart_item.price*v).toFixed(settings.numberPrecision));
//update total counters
countCartTotal();
}


What I need is to increase "v" (cart_item.quantity) by more than one. Here, it's using "v++"...but it's only increasing by 1. How can I change this to make it increase by 4 everytime I click on the plus icon?

I tried

v++ +4


But it's not working.

Thank you!

Answer Source

Use a compound assignment operator:

v += 4;
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