Javascript – Leaflet Mouseout called on MouseOver event

cssjavascriptjqueryleafletpopup

I have a leaflet map where I'm dynamically adding markers.

I want to call the popup for a marker when I hover over it in addition to when I click the marker.

My code is:

function makeMarker(){
   var Marker = L.marker...
   Marker.on('mouseover', function(){Marker.bindPopup('HI').openPopup();});

   Marker.on('mouseout', function(){Marker.closePopup();});
}

If I comment out the mouseout line, then the popup appears but then I have to click elswhere to close it.
The problem is when I put in the mouseout, at that point, the cursor kinda flickers when it hovers over the marker and nothing shows. I think that the popup is openning but then closing really fast which is why the cursor flickers but I don't know how to fix this

Best Answer

The popup is actually loading underneath the cursor and 'stealing' the mouse from the Marker, triggering the Marker.mouseout() event, which causes the popup to close and re-triggers the Marker.mouseover() event... and the cycle continues which is why you see the 'flicker'.

I have seen this happen depending on the zoom level (usually when zoomed right out).

Try adding an offset into your popup options to get it out of the way:

function makeMarker(){
   var Marker = L.marker...
   Marker.on('mouseover', function(){Marker.bindPopup('HI', {'offset': L.point(0,-50)}).openPopup();});

   Marker.on('mouseout', function(){Marker.closePopup();});
}

Related Solutions

Javascript – Event binding on dynamically created elements

As of jQuery 1.7 you should use jQuery.fn.on with the selector parameter filled:

$(staticAncestors).on(eventName, dynamicChild, function() {});

Explanation:

This is called event delegation and works as followed. The event is attached to a static parent (staticAncestors) of the element that should be handled. This jQuery handler is triggered every time the event triggers on this element or one of the descendant elements. The handler then checks if the element that triggered the event matches your selector (dynamicChild). When there is a match then your custom handler function is executed.

Prior to this, the recommended approach was to use live():

$(selector).live( eventName, function(){} );

However, live() was deprecated in 1.7 in favour of on(), and completely removed in 1.9. The live() signature:

$(selector).live( eventName, function(){} );

... can be replaced with the following on() signature:

$(document).on( eventName, selector, function(){} );

For example, if your page was dynamically creating elements with the class name dosomething you would bind the event to a parent which already exists (this is the nub of the problem here, you need something that exists to bind to, don't bind to the dynamic content), this can be (and the easiest option) is document. Though bear in mind document may not be the most efficient option.

$(document).on('mouseover mouseout', '.dosomething', function(){
    // what you want to happen when mouseover and mouseout 
    // occurs on elements that match '.dosomething'
});

Any parent that exists at the time the event is bound is fine. For example

$('.buttons').on('click', 'button', function(){
    // do something here
});

would apply to

<div class="buttons">
    <!-- <button>s that are generated dynamically and added here -->
</div>

Leaflet & Mapbox: OpenPopup not working

Put openPopup call after you add the marker to the map and you should be fine.

Best Answer

Related Solutions

Javascript – Event binding on dynamically created elements

Leaflet & Mapbox: OpenPopup not working

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