OpenLayers delete selected features by the right-click pop-up

Question

Following this question:

Deleting selected feature in OpenLayers?

I would like to have also an option to delete the object by the mouse right-click.

I found an option for switching on the context menu:

How can I select a feature in Openlayers 3 by right click it?

and tried to combine it with my example by using this code

https://rawgit.com/jonataswalker/ol-contextmenu/master/examples/contextmenu.js

in order to have some small popup after right-click on the selected object with the delete option.

Finally I've built the code like this:

var deleteFeature = function(evt){
  var rightcl = document.getElementById('map').oncontextmenu = function(e){
  e = e?e:window.event;
  if (e.preventDefault) e.preventDefault(); // For non-IE browsers.
  else return false; // For IE browsers.
  };
  if(evt.keyCode == 46){
  var selectCollection = selectInteraction.getFeatures();
    if (selectCollection.getLength() > 0) {
    vectorLayer.getSource().removeFeature(selectCollection.item(0));
   }
 } else if (rightcl) {
  var selectCollection = selectInteraction.getFeatures();
    if (selectCollection.getLength() > 0) {
    vectorLayer.getSource().removeFeature(selectCollection.item(0));
   }
 };
};
document.addEventListener('keydown', deleteFeature, false);

which doesn't work at all.

I tried to define the right-click event by using this example:

http://spatialnotes.blogspot.com/2010/11/capturing-right-click-events-in.html

and include it as an internal variable. In this case, the right-click would work normally for the whole map, but it could run the pop-up or simply delete the selected feature.

Is there any chance to resolve it?

My full JSfiddle is here:

https://jsfiddle.net/8grsq5hk/

Answer 1

Problem with your code is that you are setting right click processing inside the event listener deleteFeature, so it's set up only after delete is pressed. You should catch right click outside deleteFeature event listener, on the same global level.

Code could then look something like this:

function removeSelectedFeature() {
  var selectCollection = selectInteraction.getFeatures();
  if (selectCollection.getLength() > 0) {
    vectorLayer.getSource().removeFeature(selectCollection.item(0));
  }
}

var deleteFeature = function(evt) {
  if (evt.keyCode == 46) {
    removeSelectedFeature();
  }
};
document.addEventListener('keydown', deleteFeature, false);

document.getElementById('map').oncontextmenu = function(e) {
  removeSelectedFeature();
  e = e ? e : window.event;
  if (e.preventDefault)
    e.preventDefault();
  else {
    return false;
  }
};