Dynamically add new array to existing object array React JS

Question

I am getting the value of id and quantity during the click button. I want add a new array inside the object array. Below is the code

adddata =(d,v) => {

    const product = [];

    for (let i = 0; i < 1; i++) {

    product.push({
                   product_id:d,    
                   cart_quantity:v
            });
        }
console.log(product);


<button value={this.state.quantity} className="btn" onClick={adddata} data-id={item.product_id}>Add to cart</button>

The only issue with this implementation is that. it replacing the new value with an existing one. I want to merge it dynamically every time click on the button.

Please help

When the addData method is called, It's setting the array to an empty array. That's why you can't get all the data but just the current data — Chandradeepta Laha
– Chandradeepta Laha, Commented Mar 10, 2021 at 6:31
I assume that you have the array in state, you should push the value to that array and if you insist on creating a new array then you can probably use spread operators like stateArray = [ ...stateArray, ...newArray ]. And you don't need for loop if you are only pushing one value. — Abdul Haseeb
– Abdul Haseeb, Commented Mar 10, 2021 at 6:32

BadPiggie · Accepted Answer · 2021-03-10 06:31:04Z

1

You defined the variable product inside the function, So each time when you execute the function, It will be reinitialized.

Use Global Variable / State

// global
const product = [];

addData =(d,v) => {

    // I removed the loop because it's useless here.

    product.push({
       product_id:d,    
       cart_quantity:v
    });
}

answered Mar 10, 2021 at 6:31

BadPiggie

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1 Comment

nitin kumar Over a year ago

thanks a lot. I just tried this and it's working for me. thank you for the help.

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