fastspring.builder.add(productId)

<!--

    DEMO INFO

    Add will change the selected attribute of a product from false to true. It will not change

    the quantity of an item.

-->

​

<!-- Configure an add button to add an item to the cart. -->

<button onclick="fastspring.builder.add('phot-io-main-app');">Add to cart</button>

​

<!--

    DEMO EFFECTS

-->

<br /><br />

<div>

    Is phot-io-main-app in cart:

    <span data-fsc-item-path="phot-io-main-app" data-fsc-item-selected></span>

</div>

​

<!--

    DEMO SETUP

        - Initialize the Store Builder Library

-->

<script

    id="fsc-api"

    src="https://sbl.onfastspring.com/sbl/1.0.2/fastspring-builder.min.js"

    type="text/javascript"

    data-storefront="fastspringexamples.test.onfastspring.com/popup-fastspringexamples"

    data-continuous="true">

</script>