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my idea is to add different buttons for drawing interaction in OL3 such as :


<button id="Point" onclick="addInteractions(Point)">button1</button> <button id="Polygon" onclick="drawPolygon(Polygon)">button2</button <button id="LineString" onclick="drawLine(LineString)">button2</button> var drawstyle = new ol.style.Style({ fill: new ol.style.Fill({color: 'rgba(255, 255, 255, 0.2)'}), stroke: new ol.style.Stroke({color: '#ffcc33', width: 2}), image: new ol.style.Circle({radius: 7, fill: new ol.style.Fill({ color: '#ffcc33'}) })
}); var source = new ol.source.Vector(); var vector = new ol.layer.Vector({source: source, style: drawstyle)}; function addInteractions(str) { var draw = new ol.interaction.Draw({ source: source, type: str }); map.addInteraction(draw); }


on the official site of OL, all examples used the html select tag, but I don't want to use it. can someone help me please !

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Point is not defined when you call onclick="addInteractions(Point)".

Instead of onclick="addInteractions(Point)" you should use onclick='addInteractions("Point")'. This second call passes the string Point as expected by the function addInteractions.

You should also call the same function addInteractions on the other two buttons, right? It should be:

<button id="Point" onclick='addInteractions("Point")'>button1</button>
<button id="Polygon" onclick='addInteractions("Polygon")'>button2</button>
<button id="LineString" onclick='addInteractions("LineString")'>button2</button>

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