How do I use GeoDjango Pointfield on a form?

I wanted to know to use the PointField widget that is automatically generated from the Django form.

I am using generic views for this (CreateView)

This is what my model looks like.

from django.contrib.gis.db import models

class Post(models.Model):
    title = models.CharField(max_length=60)
    text = models.CharField(max_length=255)
    location = models.PointField(geography=True, null=True, blank=True)
    objects = models.GeoManager()

      

        
        
        
      

    

The form is automatically generated for me and I will just name it in my opinion. Thus:

{{form.as_p}}

This is the result of this piece of code.

<form method="post">
  <input type='hidden' name='csrfmiddlewaretoken' value='wVZJIf7098cyREWe3n3jiZinPdbl8nEe' />
  <p><label for="id_title">Title:</label> <input id="id_title" maxlength="60" name="title" type="text" /></p>
<p><label for="id_text">Text:</label> <input id="id_text" maxlength="255" name="text" type="text" /></p>
<p><label for="id_location">Location:</label> <style type="text/css">
    #id_location_map { width: 600px; height: 400px; }
    #id_location_map .aligned label { float: inherit; }
    #id_location_div_map { position: relative; vertical-align: top; float: left; }
    #id_location { display: none; }
    .olControlEditingToolbar .olControlModifyFeatureItemActive {
        background-image: url("/static/admin/img/gis/move_vertex_on.png");
        background-repeat: no-repeat;
    }
    .olControlEditingToolbar .olControlModifyFeatureItemInactive {
        background-image: url("/static/admin/img/gis/move_vertex_off.png");
        background-repeat: no-repeat;
    }
</style>

<div id="id_location_div_map">
    <div id="id_location_map"></div>
    <span class="clear_features"><a href="javascript:geodjango_location.clearFeatures()">Delete all Features</a></span>

    <textarea id="id_location" class="vSerializedField required" cols="150" rows="10" name="location"></textarea>
    <script type="text/javascript">
        var map_options = {};
        var options = {
            geom_name: 'Point',
            id: 'id_location',
            map_id: 'id_location_map',
            map_options: map_options,
            map_srid: 4326,
            name: 'location'
        };

        var geodjango_location = new MapWidget(options);
    </script>
</div>
</p>
  <input type="submit" value="Create" />
</form>

      

        
        
        
      

    

In the head tags, I import the OpenLayers script from    http://cdnjs.cloudflare.com/ajax/libs/openlayers/2.13.1/OpenLayers.js

However, the page won't show anything for the dot field. (Other fields work fine).

Chromedevtools shows this error

Uncaught ReferenceError: MapWidget is not defined 

      

        
        
        
      

    

For this line of code

var geodjango_location = new MapWidget(options)

      

        
        
        
      

    

Basically, I want to know if there is some other javascript library that I have to link from, or am I missing something else?

I've looked at the GeoDjango forms documentation but don't know what else to try    https://docs.djangoproject.com/en/dev/ref/contrib/gis/forms-api/