openlayers 2 - How to skip drag event to stop a feature being dragged

I am new to OpenLayers and I'm trying to drag markers and skip some markers from being dragged, I've tried dragFeature.deactivate(); it will deactivate entire features.

Please check this code :

dragFeature = new OpenLayers.Control.DragFeature(vectorLayer, {
    autoActivate: true,

    onEnter: function (feature) {                 
        //  example assign : x=1;
        //  if(x==0){ continue draging of a feature }
        //  else{  stop a feature from being dragged }
    },
    onLeave: function (feature) {            

    },
    onStart: function (feature, pixel) {
    },        

    onComplete: function (feature, pixel) {
    }
});
map.addControl(dragFeature);
dragFeature.activate();

Please help me.

Answer

You can check feature attributes and deactivate drag handler for some values:

drag.onStart = function(f,p) {

    if (f.attributes.draggable === false) {
        drag.handlers.drag.deactivate();
    }
}