OpenLayers 3 dragBox on mobile

Question

I'm currently implementing a dragBox to select multiple vectors at once. Since the dragBox object requires a "condition:" and in the official example it is a keyPress, "shift" I think, I have set up a singleton boolean variable in Angular that will set the condition to "ol.events.condition.always" or "ol.events.condition.never" which the object accepts and works fine on a computer...however does not work on mobile, I thought this might work on mobile something like drawing a circle but does not.

Is there a way to make this work on mobile?

Here's my code.

 mapFeature.addDragBox = function () {

            webMapValues.dragBox = new ol.interaction.DragBox({
                /* dragbox interaction is active only if "multi select" 
check box is checked is pressed */
                condition: ((webMapValues.multiSelect == true) ? 
ol.events.condition.always : ol.events.condition.never),
                /* style the box */
                style: new ol.style.Style({
                    stroke: new ol.style.Stroke({
                        color: [0, 0, 255, 1]
                    })
                })
            });
            /* add the DragBox interaction to the map */
            webMapValues.mapObj.addInteraction(webMapValues.dragBox);

            if (webMapValues.multiSelect == true) {
                webMapValues.vectorMultiSelect = new 
ol.interaction.Select();

webMapValues.mapObj.addInteraction(webMapValues.vectorMultiSelect);

                webMapValues.multiSelectFeatures = 
webMapValues.vectorMultiSelect.getFeatures();
                webMapValues.dragBox.on('boxend', function () {
                    // features that intersect the box are added to the 
collection of
                    // selected features
                    webMapValues.clickedCoordinates = 
webMapValues.dragBox.getGeometry().getCoordinates();
                    var extent = 
webMapValues.dragBox.getGeometry().getExtent();
                    var layer = rcisMapService.getLayer("vector");
                    angular.forEach(layer, function (Layer, key) {
                        var source = Layer.getSource();
                        source.forEachFeatureIntersectingExtent(extent, 
function (feature) {

webMapValues.multiSelectedFeatures.push(vector);
                        });
                    });
                    mapFeature.Highlight();

                });

                webMapValues.dragBox.on('boxstart', function () {
                    webMapValues.popup.setPosition(undefined);
                    webMapValues.multiSelectedFeatures = [];
                });
            }

        };

Answer 1

The ability to "Drag" on a mobile device doesn't exist in OpenLayers 3...the closest thing to it using the "Draw" feature to draw a square and then get everything that intersects with that square.

 if (selectionToolsSelection == "Box") {
                var geometryFunction = ol.interaction.Draw.createBox();
                drawObj = new ol.interaction.Draw({
                    features: features,
                    type: "Circle",
                    geometryFunction: geometryFunction
                });
                mapObj.addInteraction(drawObj);

            }  

Then you can catch the "drawend" event and do what you need to ...

  drawObj.on('drawend', function (e) {Do magic stuff here});            

Answer 2

Touch devices are supported for dragboxes by setting the condition option to mouseActionButton (see: Pull Request: Support touch events for DragBox interaction)

import {mouseActionButton} from 'ol/events/condition';

const dragBox = new DragBox({
  condition: mouseActionButton,
});