This plugin overrides L.Popup to remove the need to move the map to be able to see the content of the popup.
JavaScript CSS

README.md

Leaflet Responsive Popup

This plugin removes the need to move the map to be able to see the content of the popup. This happens when opening a popup near an edge of the map. The implementation overrides L.Popup.

Leaflet L.Popup Leaflet L.ResponsivePopup

Here is a demo and a use case.

Usage

include leaflet and leaflet-responsive-popup

<script src="https://unpkg.com/leaflet@1.0.2/dist/leaflet.js"></script>
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.0.2/dist/leaflet.css" />

<script src="https://unpkg.com/leaflet-responsive-popup@0.2.0/leaflet.responsive.popup.js"></script>
<link rel="stylesheet" href="https://unpkg.com/leaflet-responsive-popup@0.2.0/leaflet.responsive.popup.css" />

bind a L.ResponsivePopup to your markers

var popup = L.responsivePopup().setContent('A pretty CSS3 responsive popup.<br> Easily customizable.');
L.marker([48.850258, 2.351074], { icon: myIcon }).addTo(map).bindPopup(popup);

Options

offset

The offset of the popup position.

As the position of the popup is not always above, it is slightly different from the L.Popup option.

offset.x is used when the popup is either left or right. offset.y is used when the popup is either top or bottom.

var popup = L.responsivePopup({ offset: [10,10] }).setContent('A pretty CSS3 responsive popup.<br> Easily customizable.');
L.marker([48.850258, 2.351074], { icon: myIcon }).addTo(map).bindPopup(popup);

autoPanPadding

Space (in pixels) we allow between the popup and the border of the map before we consider the popup is overflowing. autoPanPadding.x is used to prevent left and right overflows, autoPanPadding.y is used to prevent top and bottom overflows.

var popup = L.responsivePopup({ autoPanPadding: [10,10] }).setContent('A pretty CSS3 responsive popup.<br> Easily customizable.');
L.marker([48.850258, 2.351074], { icon: myIcon }).addTo(map).bindPopup(popup);

hasTip

var popup = L.responsivePopup({ hasTip: false }).setContent('A pretty CSS3 responsive popup.<br> Easily customizable.');
L.marker([48.850258, 2.351074], { icon: myIcon }).addTo(map).bindPopup(popup);

If you don't show the tips, you can either change the icon of the marker like here.

Changing marker icon to highlight position

or add another marker to highlight the marker's position.

Adding a marker icon to highlight position

map.on('popupopen',function(e) {
  e.popup.highlight = L.circleMarker(e.popup.getLatLng(), { radius: 15 , opacity: 0, fillColor: "#000000", fillOpacity: .3 }).addTo(map);
});

map.on('popupclose',function(e) {
  map.removeLayer(e.popup.highlight);
});

Notes

Needs at least Leaflet 1.0

This was inspired by Rrose: A Leaflet Plugin for Edge Cases.