title: change event on form fields django
body: <p>I got this called django form fields on a template sales.html :</p>
  
  <pre><code>&lt;div class="center-panel"&gt;
      &lt;form method="post" action="{% url 'cost_control_app:request_update' form_sale.instance.request %}"&gt;
          {% csrf_token %}
          &lt;div class="row"&gt;
                  {%include "partials/field.html" with field=form_sale.item %}
                  {%include "partials/field.html" with field=form_sale.usd_value %}
                  {%include "partials/field.html" with field=form_sale.exchange_rate %}
                  {%include "partials/field.html" with field=form_sale.euros_value %}
                  {%include "partials/field.html" with field=form_sale.date %}
          &lt;/div&gt;
      &lt;/form&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>I need that when i change the usd value field, the euros field update itself depending of the exchange rate field value and viceversa....is there a "onchange" event to call or something ??</p>
  
  <p>Thanks for your help !!</p>