(Solved) How to truncate output of javascript

[Whispar1]

Okay I have a small script that adds the product description to a rich pin. However, the description is too long so how do I truncate the output?

 

I tried:  text: '{$product->name} {$product->description | truncate:200}'  but of course resulted in an error

 

Original script:

<script type="text/javascript">
AddShoppersTracking.coupons = {
        pinterest: {
            text: '{$product->name} {$product->description}'
        }
    };
</script>

Edited May 21, 2014 by Whispar1 (see edit history)

[Whispar1]

Solved - Nemo tweaked it here: http://www.prestashop.com/forums/topic/327785-adding-product-short-description-to-pinterest-button/?do=findComment&comment=1679223

{$product->description|truncate:100:'...':true}