[英]How to find equivalent coordinates in current world from other world in openlayers without mouse event
[英]beforefeatureadded event equivalent for OpenLayers 3
對於openlayers 2,您有一個名為beforefeatureadded的事件,可以在實際添加新功能之前進行驗證。 OpenLayers 3的beforefeatureadded事件相當於什么?
OpenLayers 2示例:
layer.events.register("beforefeatureadded", layer, validationFunction);
與OpenLayers 2 beforefeatureadded
事件等效的是,將暫存集合用於繪制的功能:
var source = new ol.source.Vector();
var features = new ol.Collection();
features.on('add', function(evt) {
var feature = evt.element;
if (conditionMet(feature)) {
source.addFeature(evt.element);
}
// clear the staging collection
features.pop();
});
也可以使用Draw條件,這就是@ robert-smith實際上想要的:
var draw = new ol.interaction.Draw({
condition: function(evt) {
return ol.events.condition.noModifierKeys(evt) && conditionMet(evt);
}
});
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.