title: Dynamic actions based on field input in Django
body: <p>Im trying to make a Django site, but after lots of research and tutorials i still cant find the answer to this. In GUI toolkits there is often an option to perform some action (eg validity checking) as a user is typing charachers into a field or any other type of event. </p>
  
  <p>Is there equivalent event-action functionality in Django web interfaces and how? </p>
  
  <p>Specifically i would like a user to be able to write a WMS url in a field, and as this is being typed or upon clicking a button have a preexisting geodjango map widget in the same screen be updated to show that wms and possibly zoom to its extents. Will this have to reload the entire html page with updated html code or could it be done without any reloading? </p>
  
  <p>Another example would be if a user chooses a country from a choicefield to zoom the map to the selected country (assuming we can find the extent). </p>