# Installation DataLayer Prestashop

### Partie code

Tout d'abord insérez le code suivant dans le fichier <mark style="color:yellow;">`head.tpl`</mark> de votre thème, juste avant l'intégration du script de <mark style="color:green;">**Google Tag Manager**</mark>

<pre class="language-javascript"><code class="lang-javascript">&#x3C;script>
<strong>    window.dataLayer = window.dataLayer || [];
</strong>&#x3C;/script>
</code></pre>

En suite dans le fichier <mark style="color:yellow;">`templates/checkout/order-confirmation.tpl`</mark>, a la fin du block 'page\_content\_container' , ajoutez le code suivant en modifiant si besoin le nom des variables.

{% hint style="info" %}
Attention la fonction stringToPrice permet de transformer les prix de type string fournis par smarty en nombre pour que analytics puisses calculer les revenus
{% endhint %}

```javascript
{literal}
    <script>

    function stringToPrice(string){
        let prixString = `${string}`;
        let prixSansEuro = prixString.replace(" €", "").replace(",", ".");
        let prixNum = parseFloat(prixSansEuro);
      return prixNum;
    };
    // Send transaction data with a pageview if available
    // when the page loads. Otherwise, use an event when the transaction
    // data becomes available.
    dataLayer.push({ ecommerce: null });  // Clear the previous ecommerce object.
    dataLayer.push({
      event: "purchase",
      ecommerce: {
          transaction_id: '{/literal}{$order.details['reference']}{literal}',  // Transaction ID. Required for purchases and refunds.
          value: stringToPrice('{/literal}{$order.totals.total['value']}{literal}'),  // Total transaction value (incl. tax and shipping)
          items: [
            {/literal}
              {foreach from=$order.products item=product}
                {literal}
                  {
                    item_name: '{/literal}{$product['product_name']}{literal}',     // Name or ID is required.
                    item_id: '{/literal}{$product['product_reference']}{literal}',
                    price: stringToPrice('{/literal}{$product['price']}{literal}'),
                    quantity: stringToPrice('{/literal}{$product['product_quantity']}{literal}'),
                  },
                  {/literal}
              {/foreach}
            {literal}
          ]
        }
      }
    );
    </script>
  {/literal}
```

### Google Tag Manager

Vérifiez que <mark style="color:green;">**Google Analytics**</mark> est bien lié (cf : [Connecter Google Analytics](/developpement-web/seo-and-marketing/google-tag-manager/connecter-google-analytics.md))


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