Please follow below steps to add “Add to cart” button on Shopify collection pages for each product.
- From your Shopify admin, to to Online Store > Theme.
- Find the theme you want to edit and then click Action > Edit code.
- In the online code editor of collection page find to the loop
{% for product in collection.products %}add the below code.
<form action="/cart/add" method="post">
{% if product.variants.size == 1 %}
<input type="hidden" name="id" value="{{ product.variants.first.id }}" />
{% else %}
<select name="id">{% for variant in product.variants %}<option value="{{ variant.id }}">{{ variant.title }}</option>{% endfor %}</select>
{% endif %}
<div><button type="submit" name="add">Add to cart</button></div>
</form>
