Modifying a gradient fill with a script

function Visible() {
  var Grps = app.activeDocument.layerSets; // loops through all groups
  for(var i = 0; i < Grps.length; i++){
    var tmp = app.activeDocument.layerSets[i].layers.length;
    app.activeDocument.layerSets[i].visible=true;
    var groupChildArr = app.activeDocument.layerSets[i].layers;
    var randLays = Math.floor(Math.random() * tmp);
    if ( i = 4 ) {
        ... code for modifying gradient degree of groupChildArr[randLays] ...
    }
    groupChildArr[randLays].visible = true;
  }
  Save();
  Revert();
}

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@Laethageal wrote:

Thanks.

After seeing your teasing, I was on the defensive tbh. I had also posted right above the method I finally was able to use to select various layers, so I thought your answer was another teasing. 

But I took 1 minute to check it out and it is actually some great information. I can't say I understand all the various form of coding, but some are easy to understand/use for me and as I learn more coding, I am pretty sure it'll be useful for me.

Thanks!

You will have to forgive my sense of humor. All of us are at different stages with scripting, I still class myself as a beginner. I just put it out there in case it was helpful. I have added your example to the gist. There is often a good chance that somebody has done what you wish to do before. I generally use the following "Active Layer Inspector" script to get info on the selected layer:

https://gist.github.com/MarshySwamp/ef345ef3dec60a843465347ee6fcae2f

Would you happen to know how I can change the degree of the gradient when I already have code pointing to a particular gradient layer, as posted above? 

The other forum members have explained the process, this is what I came up with:

if (app.activeDocument.activeLayer.kind === LayerKind.GRADIENTFILL) {

    gradAngle(-90);

    function gradAngle(angle) {
        var s2t = function (s) {
            return app.stringIDToTypeID(s);
        };
        var descriptor = new ActionDescriptor();
        var reference = new ActionReference();
        reference.putEnumerated(s2t("contentLayer"), s2t("ordinal"), s2t("targetEnum"));
        descriptor.putReference(s2t("null"), reference);
        descriptor.putUnitDouble(s2t("angle"), s2t("angleUnit"), angle);
        descriptor.putObject(s2t("to"), s2t("gradientLayer"), descriptor);
        executeAction(s2t("set"), descriptor, DialogModes.NO);
    }
    
} else {
    alert("The active layer is not a Gradient Fill layer!")
}

I recorded changing the angle of an existing gradient fill layer via script listener, then through "targeted" trial and error removed the code that was not associated with the angle change, then ran the result through the Clean SL script and then added the conditional check.

EDIT: From the other topic, this modified code from jazz-y is cleaner than my attempt:

gradientLayerAngle(-90);

function gradientLayerAngle(theAngle) {
    /* https://community.adobe.com/t5/photoshop-ecosystem-discussions/need-help-with-randomizing-gradient-fills/td-p/12349266 */
    s2t = stringIDToTypeID;
    (r = new ActionReference()).putEnumerated(s2t("contentLayer"), s2t("ordinal"), s2t("targetEnum"));
    (d = new ActionDescriptor()).putReference(s2t("null"), r);
    (d2 = new ActionDescriptor()).putUnitDouble(s2t("angle"), s2t("angleUnit"), theAngle);
    d2.putEnumerated(s2t("type"), s2t("gradientType"), s2t("linear"));
    d.putObject(s2t("to"), s2t("gradientLayer"), d2);
    executeAction(s2t("set"), d, DialogModes.NO);
}