Odoo template get value from input
<p>In a custom template (website) I've added an input tag. I'd like to get the value of this tag in order to send it to the controller. By adding this to the URL, but I always get 'None' back.</p>

<pre><code>&lt;template id="InputTemp" inherit_id="website_sale.cart"&gt;
        &lt;xpath expr="//div[@id='right_column']" position="after"&gt;
            &lt;div class="col-lg-3 col-lg-offset-1 col-sm-3 col-md-3 text-muted" id="inputform"&gt;
                    &lt;h3&gt;Please enter value:&lt;/h3&gt;
                    &lt;label class="control-label" for="waardebon"&gt;Value&lt;/label&gt;
                    &lt;input type="text" name="value_input" class="form-control"/&gt;
                    &lt;a t-attf-href="/cart/#{str(value_input)}" class="btn btn-primary btn-lg mt8"&gt;Submit&lt;/a&gt;
            &lt;/div&gt;
        &lt;/xpath&gt;
    &lt;/template&gt;
</code></pre>