OpenLayers 3 Disable Multi-Select

Question

有没有办法在OpenLayers 3中使用selectInteraction ，只允许一次选择一个功能？

Answer 1

define select interaction as follow :

select = new ol.interaction.Select (
    toggleCondition: ol.events.condition.never
)

Answer 2

Not really sure I understood well.

If you go to the API doc for OpenLayers 3.4 and untick Stable Only on the page top right, you will see a multi option to manage this. Normally, according to the doc, what you are asking is already by default.

Multi A boolean that determines if the default behaviour should select only single features or all (overlapping) features at the clicked map position. Default is false ie single select

Answer 3

For OpenLayers4 this can easily be done by combining conditions.

For example a condition that only selects on singleClick and not when shiftKey is pressed:

const select = new Select({
  condition: (mapBrowserEvent) => {
    return singleClick(mapBrowserEvent) && !shiftKeyOnly(mapBrowserEvent)},
  layers: [layer]
});

Find more conditions in the API doc: http://openlayers.org/en/latest/apidoc/module-ol_events_condition.html