# Turn on auto-advance feature

## Overview

Use the **Cart** object to turn on the auto-advance feature (if mandatory fields are filled in) on the InLine checkout by calling the TwoCoInlineCart.cart.setAutoAdvance(true) method.

## Use case

1. Add an HTML link or button on your page like the one below.
2. Create a JavaScript click handler to execute the InLine Client desired methods.
3. Use the TwoCoInlineCart.products.add({code, quantity, options}) method to prepare your catalog product.
4. Turn on the auto-advance feature by calling the TwoCoInlineCart.cart.setAutoAdvance(true) method.
5. Set all the mandatory fields for billing.<br>

   ```javascript
   TwoCoInlineCart.billing.setCountry('US');
   TwoCoInlineCart.billing.setEmail('some@email.com');
   TwoCoInlineCart.billing.setName('John Doe');
   ```
6. Use the TwoCoInlineCart.cart.checkout() method to show the cart on your page.

## Request sample

### HTML

```html
<a href="#" class="btn btn-success" id="buy-button">Buy now!</a>
```

### JavaScript

```javascript
window.document.getElementById('buy-button').addEventListener('click', function() {
    TwoCoInlineCart.products.add({
        code: "74B8E17CC0"
    });
    TwoCoInlineCart.cart.setAutoAdvance(true);
    TwoCoInlineCart.billing.setCountry('US');
    TwoCoInlineCart.billing.setEmail('some@email.com');
    TwoCoInlineCart.billing.setName('John Doe');
    TwoCoInlineCart.cart.checkout();
});
```

## Demo

After turning on the cart auto-advance feature using the above method, your cart should look like this:

{% embed url="<https://codepen.io/2checkout-documentation/pen/rNxvVBE>" %}


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