leaflet: don't fire click event function on doubleclick

问题

I have a question concerning clicks on a map in leaflet. If I click on the map I want to set a marker there, but if doubleclick on the map I just want to zoom in without setting a marker. So I have the follwing code:

var map = L.map(attrs.id, {
            center: [scope.lat, scope.lng],
            zoom: 14
        });
var marker = L.marker([scope.lat, scope.lng],{draggable: true});
map.on('click', function(event){
            marker.setLatLng(event.latlng);
            marker.addTo(map);                
        });

The problem now is, when I doublclick on the map the click event is also fired and I would like to remove that behavior. How can I achieve that?

Thanks Magda

回答1:

So, I found a way to do that, I am still not sure, if there is a better way to do it.

var map = L.map(attrs.id, {
        center: [scope.lat, scope.lng],
        zoom: 14
    });
map.clicked = 0;                                                                      
L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
        maxZoom: 18
    }).addTo(map);
var marker = L.marker([scope.lat, scope.lng],{draggable: true});
map.on('click', function(event){
    map.clicked = map.clicked + 1;
    setTimeout(function(){
        if(map.clicked == 1){
            marker.setLatLng(event.latlng);
            marker.addTo(map);                
            map.clicked = 0;
        }
     }, 300);
});
map.on('dblclick', function(event){
    map.clicked = 0;
    map.zoomIn();
});

回答2:

Had the same problem of 2 x unwanted click events firing when listening for dblclick.

Note: I wanted single and double clicks on the same element to perform different actions.

I adapted this approach to my leaflet map, which is not bullet proof but eliminates 99% of the conflicts:

var timer = 0;
var delay = 200;
var prevent = false;

$("#target")
  .on("click", function() {
    timer = setTimeout(function() {
      if (!prevent) {
        doClickAction();
      }
      prevent = false;
    }, delay);
  })
  .on("dblclick", function() {
    clearTimeout(timer);
    prevent = true;
    doDoubleClickAction();
  });

Credit: CSS-Tricks

Code Pen Example

回答3:

This is still an issue on recent (leaflet 1.4) versions.

Alternative approach I used that:

legit usage of setTimeout and clearTimeout
without adding random props to the map object
no jQuery:

map.on('click', function(event) {
  if (_dblClickTimer !== null) {
    return;
  }
  _dblClickTimer = setTimeout(() => {

    // real 'click' event handler here

    _dblClickTimer = null;
  }, 200);
})
.on("dblclick", function() {
  clearTimeout(_dblClickTimer);
  _dblClickTimer = null;

  // real 'dblclick' handler here (if any). Do not add anything to just have the default zoom behavior
});

Note that the 200 ms delay must be tested. On my environment using a value like 100 was not enough as the doubleclick event is triggered with a delay.

来源：https://stackoverflow.com/questions/29035896/leaflet-dont-fire-click-event-function-on-doubleclick

标签

javascript

leaflet