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Can someone please help me with this problem? 
 
I would like to get the value of the product_id field into the v_product_id variable from the selection.
The selection field is in the website_sale.product template.

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This is code:

--<t t-placeholder="select">
--<input type="hidden" class="product_id" name="product_id" t-att-value="product_variant.id"/>
--<input type="hidden" class="product_template_id" name="product_template_id" t-att-value="product.id"/>
--<input t-if="product.public_categ_ids.ids" type="hidden" class="product_category_id" name="product_category_id" t-att-value="product.public_categ_ids.ids[0]"/>
--<t t-if="combination" t-call="sale.variants">
--<t t-set="ul_class" t-valuef="flex-column"/>
--<t t-set="parent_combination" t-value="None"/>
--</t>