How can I pass the selected value from p-dropdown to ts?

This is an example of code for p-dropdown.

// product.component.html
<p-dropdown
    [options]="products"
    optionLabel="productName"
    placeholder="Select a product"
>
</p-dropdown>

This is json data I am getting from API. In the p-dropdown, the productName is successfully shown.

// products data
[
    {
        productName: "Apple",
        productId: 1
    },
    {
        productName: "Banana",
        productId: 2
    },
    {
        productName: "Peach",
        productId: 3
    },
]

My question is, when users select the product, how to store productId from the selected product to a newly created variable in ts? There are multiple p-dropdown in p-table's rows so I want to store the multiple productId selected values into an array selectedProductId.

// product.component.ts
// How to store productID from the selected product to a newly created variable in ts?
selectedProductId!: any[];

I suggest you to read the documentation at https://www.primefaces.org/primeng-v13/dropdown

In your case it seems be possible do that:

in your.component.html:

<p-dropdown
    (onChange)="selectProduct($event?.value)"
    [options]="products"
    optionLabel="productName"
    optionValue="productId">
</p-dropdown>

in your.component.ts:

selectedProductId: number[] = [];

selectProduct(id: number) {
    if (!this.selectedProductId.includes(id))
        this.selectedProductId.push(id);
}