leaflet - How to update a popup content from its marker?

I created a popup with Leaflet doing so:

marker.bindPopup(content).openPopup();

How can I update the content value afterwards?

I suppose to do it from the marker, something like this:

marker.updatePopup(newContent);

Answer

I suppose you want the content to be changed after some event occured, like mouseover, contextmenu, or anything else.

To do so, you can use the following code:

//marker creation

var marker = L.marker([44.63, 22.65]).bindPopup('something').addTo(map);
marker.openPopup();

//changing the content on mouseover
marker.on('mouseover', function(){
    marker._popup.setContent('something else')
});

As you can see, you can acccess the popup for the desired marker using marker._popup method, and then use setContent method to change the text inside it.

popup.setContent method reference

Here's some code on Plunker demonstrating this: http://plnkr.co/edit/vjS495QPXiJpKalrNpvo?p=preview