External JavaScript file is not getting added when running on Flask
JavascriptPythonFlaskExternalJavascript Problem Overview
I have an HTML file named showMap.html:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
<title>Map</title>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false">
</script>
<script type="text/javascript" src="js/map.js"></script>
</head>
<body onload="showPosition()">
<div id="map_canvas" style="width:500px;height:500px;"></div>
</body>
</html>
And another JavaScript file map.js is placed in the js folder of the same directory.
This code works fine when the HTML file is loaded, but this does not work when I run it in the server.
I use Python's Flask framework for back-end programming and the funny thing is that the same thing will work well if I expand the JavaScript code inside the HTML file. The only problem is with the external file.
Javascript Solutions
Solution 1 - Javascript
Serve the map.js file as a static resource:
-
move the file to a
static/subdirectory of your package -
generate a static URL for it in a Jinja2 template like so:
<script type="text/javascript" src="{{ url_for('static', filename='map.js') }}"></script>
The filename parameter takes a relative path; you can use subdirectories was needed.
Solution 2 - Javascript
Step 1: Create folder with name static on project root
Step 2: Add static files in static folder
Step 3 Add in template
<script type="text/javascript" src="{{ url_for('static', filename = 'hello.js') }}"></script>
Solution 3 - Javascript
I experience the same issue, for stylesheet, the URL_FOR works but for javascript. I had to write
<script type="text/javascript" src="static/map.js"/>
It worked for me
Solution 4 - Javascript
I want to add to Martijn's answer, that you have to link your js file exactly like this:
<script type="text/javascript" src="{{ url_for('static', filename='map.js') }}"></script>
and not like this:
<script type="text/javascript" src="{{ url_for('static', filename='map.js') }}"/>