I'm new to the Open Layers library and JavaScript in general. So I wonder why can't I specify the values of id or style properties of a Feature object through the opt_geometryOrProperties constructor argument. After all it works with the geometry property:

var g = new ol.geom.Point([0, 0]);
var feature = new ol.Feature({geometry: g});

feature.getGeometry() === g; // true

But if I try it with id or style, it does not work:

var g = new ol.geom.Point([0, 0]);
var id = 1;
var style = new ol.style.Style;
var feature = new ol.Feature({
   geometry: new ol.geom.Point([0, 0]),
   id: id,
   style: style
});

feature.getId() === id; // false
feature.getStyle() === style; // false

How do I tell which properties are settable through the constructor and which are not?

I'm new to the Open Layers library and JavaScript in general. So I wonder why can't I specify the values of id or style properties of a Feature object through the opt_geometryOrProperties constructor argument. After all it works with the geometry property:

var g = new ol.geom.Point([0, 0]);
var feature = new ol.Feature({geometry: g});

feature.getGeometry() === g; // true

But if I try it with id or style, it does not work:

var g = new ol.geom.Point([0, 0]);
var id = 1;
var style = new ol.style.Style;
var feature = new ol.Feature({
   geometry: new ol.geom.Point([0, 0]),
   id: id,
   style: style
});

feature.getId() === id; // false
feature.getStyle() === style; // false

How do I tell which properties are settable through the constructor and which are not?

• javascript
• openlayers-3

2 Answers 2

To answer your first question, you can't set the style in the constructor and it seems unlikely they are going to add it to the constructor. Concerning where you can find what properties can be set in the constructor, see the API documentation.

Something that might be useful is to set the style in the layer of the vector layer.

var id = 1;
var style = new ol.style.Style;
var feature = new ol.Feature({
   geometry: new ol.geom.Point([0, 0]),
   id: id,
   style: style
});

For my experience this don't work realy... I use :

var feature = new ol.Feature({
   geometry: new ol.geom.Point([0, 0]),
   style: style
});
feature.setId(id);