ExtendScript, How to add opacity keyframe to any selected layer at current time?

[Walter Soyka]

You don’t need the .propertySpec business, and if you want to add keyframes, you need to uset setValueAtTime(). Here’s some sample code to set an opacity keyframe at 50% on the first layer of the first item in the project at its current time:

var myLayer = app.project.item(1).layer(1);
var myProperty = myLayer.opacity;
myProperty.setValueAtTime(myLayer.containingComp.time, 50);

[Mohd Faizan]

Thankyou so much!
It is working fine for 1st layer, but I wanted it to applied on selected layer(s).

[Mohd Faizan]

var myLayers = app.project.activeItem.selectedLayers;
    if (myLayers.length > 0) {
        for (var i = 0; i < myLayers.length; i++) {
        var myProperty = myLayers[i].opacity;
        myProperty.setValueAtTime(myLayers[i].containingComp.time, 0);}
    } 
    else {alert("No layers selected.");}