Can multiple objects be grouped together and easily dragged in Leaflet?

Is there a way to group a set of objects together so they can be dragged simultaneously? I want to make multiple objects draggable on a map and have them behave as a single marker when moved. Currently, I have a geojson file containing several objects that I want to make draggable but act as one cohesive unit on the map.

My current progress is as follows:

var mymap = L.map('mapid').setView...
...

var drag = L.geoJson(null,{
    draggable: true,
});

omnivore.geojson('data.geojson', null, drag).addTo(mymap)

I've added Leaflet.Path.Drag to enable dragging of the geojson objects. However, each feature in the collection is draggable independently. How can I link them together?

javascriptleafletgeojson

Answer №1

After some experimentation, I found a solution by utilizing d3 for handling the dragging functionality. By selecting the group element within the map and applying the translate function using d3.drag(), I was able to achieve the desired result.

var data = [{ x: 0, y: 0 }];
d3.select('svg').select('g').data(data)
  .attr("transform", function (data) {
      return "translate(" + data.x + "," + data.y + ")"; })
  .call(onDragDrop(dragmove, dropHandler));

function onDragDrop(dragHandler, dropHandler) {
  var drag = d3.drag();

  drag.on("drag", dragHandler)
      .on("end", dropHandler);
  return drag;
}

function dropHandler(data) {
    alert('element has been dropped');
}

function dragmove(data) {
        data.x += d3.event.dx;
        data.y += d3.event.dy;
        d3.select(this)
          .attr("transform", "translate(" + data.x + "," + data.y + ")");
}

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