z-index无法正常工作

Question

I am currently working with Leaflet and Mapbox to create a custom map. All has been working fine until I started to work on the popups.

My situation: I have a custom navigation/control panel that will be used but it needs to be behind any open popups (which it currently is not).

I have prepared a JSFiddle and this screenshot

Part of my CSS is

#map-nav {
  position: absolute;
  left: 10px;
  top: 10px;
  z-index: 2;
}
.leaflet-popup-pane, .leaflet-popup {
  z-index: 1000 !important;
}

The default leaflet classes have z-index of 7 (I think), I just overwrote it to be 100% sure. When inspecting the code in browser (FF/Chrome), I see that the z-index is set properly and no other element in the .leaflet-popup has any z-index set.

I have read that negative z-index may solve this, but as I am working with multiple elements I'd really much like a less "hacky" solution - if there is one. (JavaScript solutions are welcome as well, hence the tag)

As I can see from the code inspection, Leaflet sets some attributes to .leaflet-popup which in terms of position are: transform: translate3d(..) , bottom and left .

Any help is appreciated.

Edit:

I can put the #map-nav inside #map-content and it still won't work fiddle . However, when I try to imitate this without alle the map stuff, it does work .

Answer 1

The problem is that #map-nav exists in an entirely different stacking context than the marker and its popup.

The way you have it set up right now, the entire map is behind #map-nav . So, changing the z-index on either #map-nav or the .leaflet-popup-pane won't really help.

Disclaimer : This is a terrible, terrible hack. If you look into Leaflet's documentation and find a way to add your own widgets, I'd highly recommend doing that instead of this .

That said, I have something which sort of works ( your mileage may vary ):

1. Move #map-nav into .leaflet-map-pane
2. Create a MutationObserver and observe changes to the attributes of .leaflet-map-pane .
3. Whenever the style attribute of .leaflet-map-pane changes, grab its style.transform property and extract the x and y values. Invert those values and apply them to #map-nav .

 var map = L.map('map-content', { zoomControl: false }).setView([51.505, -0.09], 13); L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token={accessToken}', { attribution: 'Map data &copy; <a href="http://openstreetmap.org">OpenStreetMap</a> contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, Imagery © <a href="http://mapbox.com">Mapbox</a>', maxZoom: 18, id: 'rauschundrausch.cih3gisks00r8rlly0ob5s2me', accessToken: 'pk.eyJ1IjoicmF1c2NodW5kcmF1c2NoIiwiYSI6ImNpaTYyeW14MTAwNml2eW0zcmR6aHIzdDcifQ.6T8nzYq49rFnvcqk6lgYPg' }).addTo(map); var marker = L.marker([51.5, -0.09]).addTo(map); marker.bindPopup("this is a<br>large<br>popup<br>in<br>terms of height"); var mapNav = document.getElementById("map-nav"); var mapPane = document.querySelector(".leaflet-map-pane"); var rxTranslate = /translate(?:3d)?\\(([^\\)]+)\\)/i; mapPane.appendChild(mapNav); var observer = new MutationObserver(function(mutations) { if (mutations.some(m => m.attributeName === "style")) { // apply an inverse transform mapNav.style.transform = "translate(" + mapPane .style .transform .match(rxTranslate)[1] .split(",") .slice(0, 2) /* extract only x and y; discard z */ .map(n => parseFloat(n) * -1 + "px") /* invert values */ + ")"; } }); observer.observe(mapPane, { attributes: true }); 

 #map { position: fixed; top: 0; right: 0; bottom: 0; left: 0; } #map-nav { position: absolute; left: 10px; top: 10px; width: 100px; height: 100px; background-color: #ccc; z-index: 200; box-shadow: inset 0 0 0 1px #f00; } #map-content { width: 100%; height: 100%; } .leaflet-popup-pane { z-index: 3; } 

 <link rel="stylesheet" href="https://unpkg.com/leaflet@1.3.1/dist/leaflet.css" /> <script src="https://code.jquery.com/jquery-2.1.4.min.js"></script> <script src="https://unpkg.com/leaflet@1.3.1/dist/leaflet.js"></script> <div id="map"> <div id="map-content"> <div id="map-nav"></div> </div> </div> 

This may lag on some clients while dragging. You could use a timeout to defer the update but that would mean the nav menu would move around until you stop dragging.