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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