Add custom html and JS to output html page

Is there a way to add custom HTML and JS to the output page? Something like following would be nice, for example

my_before = '<script> abc ... </script>'  
my_after = '<p> Arctic Ocean</p>'
create_map('abc.html', plugin_data=True, before=my_before, after=my_after)

[claudiodsf]

Hi, it looks like m.create_map() does not exist anymore.

Is there another way of using a custom template?

[FabeG]

Maybe would it be interesting to add a add_custom_js method to Map, that could allow to write direcly some parts directly in JavaScript in case the functionnality is not available in folium yet ?

For example, something in the class Map like:

def add_custom_js(self, custom_js):
    macro = MacroElement()
    macro._template = (Template("""{% macro script(this, kwargs) %}"""
                                + custom_js
                                + """{% endmacro %}"""))
    self.get_root().add_child(macro)

It would then be possible to plug some callbacks in folium, for example:

import folium

m = folium.Map()

customjs = """
{{kwargs['map']}}.on('click', function(e) {
    alert(e.latlng);
});"""

m.add_custom_js(customjs)
m.save('customjs.html', map=m.get_name())

Please let me know if this approach seems interesting (and deserves a PR) or if there are other simpler ways to do that.