Here are a few potential titles, keeping in mind the question-and-answer format: Direct and Concise: * How to Pass Flask Data to JavaScript in a Template? * Passing Latitude/Longitude from Flask to

Passing Data from Flask to JavaScript in a Template

In Flask, integrating data from a view into JavaScript can be achieved by leveraging the Jinja2 template engine. Jinja2 allows variables declared in Flask views to be accessed within the template.

To pass a list of tuples containing longitude and latitude information to JavaScript, you can modify your view to utilize Jinja2's interpolation in your template:

<code class="html"><script>
  var geocode = [{{ ', '.join(geocode) }];
</script></code>

In your JavaScript code, you can reference the geocode variable to access the longitude and latitude values.

Alternatively, you can generate an array definition in your output:

<code class="html"><script>
  var geocode = ['{{ geocode[0] }}', '{{ geocode[1] }}'];
</script></code>

Jinja2 provides advanced Python constructs, enabling you to simplify your code:

<code class="html"><script>
  var geocode = [{{ '"{}, {}"'.format(*geocode) }}];
</script></code>

Additionally, Flask offers the tojson filter to convert a Python object into a JSON string, which can be passed into a JavaScript object:

<code class="html"><script>
  var geocode = {{ geocode | tojson }};
</script></code>

By utilizing these techniques, you can effectively transfer data from your Flask view to JavaScript in your template.

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