Integrate geographic data in GeoJSON format into a Leaflet map by using the Django template

In my Django view, I am fetching results of an SQL query and rendering it on the index.html page of my web map. The POST request successfully returns the acreage calculated from the SQL query to the page. I am also attempting to display the geojson data from the SQL query on a Leaflet map. To achieve this, I am incorporating the geojson data in the Django template instead of using a JSONResponse, as I found it challenging to return both the rendered acreage to HTML and the JSONResponse simultaneously.

Here is a snippet from my HTML document, focusing on the relevant JavaScript:

<html>
    <!-- HTML code here -->
    </html>
    

And this is the relevant part of my views.py:

 
    class HomePageView(TemplateView):
        # Python code here
    

Upon console log the data received:

 
    { "type": "FeatureCollection", "features": [ { "type": "Feature", "geometry": { // Coordinates here }, "properties": { // Properties data here } } ] }
    

When trying to access the data:

var raw_data = '{{ data }}'

The output is:

{&quot;type&quot;: &quot;FeatureCollection&quot;, &quot;features&quot;: [ {&quot;type&quot;: &quot;Feature&quot;, &quot;geometry&quot;: { // Geometry data }, &quot;properties&quot;: { // Properties data } }]}

Answer №1

Within your JSON output, you may notice the presence of ampersands (&) thanks to Django's security measures. The default setting in Django is to HTML-escape all data passed to templates to prevent malicious users from injecting harmful code.

This precaution is crucial to avoid scenarios where a malicious user could input something like

"><a href="http://my.evil.site/">Look at this cool page</a>
in a form, leading to potential security breaches on your site.

Turning off this HTML-escaping feature is not recommended. Instead, leverage the Django template filter escapejs to ensure the data is secure for Javascript utilization rather than HTML.

For optimal security and ease of maintenance, always enclose the data in quotes and utilize Javascript to parse it into JSON. Avoid simply using var data = {{data|escapejs}};

The ideal approach involves passing the data as a string using single quotes, followed by parsing the string into a JavaScript object using Javascript:

var raw_data = '{{data|escapejs}}';
var data = JSON.parse(raw_data);

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