I have placed this code in GTM to capture values from the product array and two issues are faced, currently:
var aa_ck_items = [];
try{
var aa_ck_products = analytics_dataLayer.ecommerce.purchase.products || [];
aa_ck_products.forEach(function(element) {
var currentItem = {
"unitPrice": Number(element.price) / Number(element.quantity) + Number(element.discount),
"itemId": element.id,
"quantity": Number(element.quantity),
"discount": Number(element.discount),
}
aa_ck_items.push(currentItem);
});
}catch(e){}
Issues faced
When the unitPrice value is sent it has many numbers after the decimal e.g 12.23000002 and I am looking to round it off to two decimal places. I know the two methods we can use Math.round() and .toFixed(). I am not sure how to implement it to the code above.
The discount value sometimes comes as a negative number and it always needs to be positive. How do I do that?
Can someone please help? Thank you!
Wrap it all and use .toFixed(2) like you suggested~
Do you want to make negative numbers positive, or negative numbers 0?
Given your code...
aa_ck_products.forEach(function(element) {
var currentItem = {
"unitPrice": (Number(element.price) / Number(element.quantity) + Number(element.discount)).toFixed(2),
"itemId": element.id,
"quantity": Number(element.quantity),
"discount": Math.abs(Number(element.discount)),
// OR "discount": (Number(element.discount) > 0) ? Number(element.discount) : 0,
}
aa_ck_items.push(currentItem);
});
For 1. I am not sure how to implement it to the code above <--- simply enclose the computation within ( & ) and suffix .toFixed(2) (if you need to fix to 2 digits after decimal, for example).
For 2. How do I do that? <--- Math.abs()
Both the items above are shown (with comments) on below code sample.
let aa_ck_items = [];
try {
const aa_ck_products = analytics_dataLayer.ecommerce.purchase.products || [];
aa_ck_products.forEach(function(element) {
const currentItem = {
"unitPrice": (
Number(element.price) / Number(element.quantity) + Number(element.discount)
).toFixed(2), // <<--- #1 from question, assuming 2 digits after decimal for .toFixed()
"itemId": element.id,
"quantity": Number(element.quantity),
"discount": Math.abs( // <<--- #2 from question, using Math.abs()
Number(element.discount)
)
}
aa_ck_items.push(currentItem);
});
} catch (e) {}
NOTE - The usage of var has been modified to let or const as appropriate.
Below is how I would probably write this code:
let aa_ck_items = [];
try {
const aa_ck_products = analytics_dataLayer.ecommerce.purchase.products || [];
aa_ck_items = aa_ck_products.map(
({price, quantity, discount, id}) => ({
"unitPrice": (
Number(price) / Number(quantity) + Number(discount)
).toFixed(2),
"itemId": id,
"quantity": Number(quantity),
"discount": Math.abs(Number(discount))
})
);
} catch (e) {}
Thank you James for the suggestion in the comments.
//to approximate a decimal number using fixed-point notation
let number = 123.456;
number.toFixed(2); //expected as: 123.45
//to get the module (positive side) of a number
let negative_number = -10;
Math.abs(negative_number); //expected as: 10