Apply new color to layers

Question

Hello!
I would like to create a script in javascript  for Photoshop CC that does the following:
1) Check each layer in the current document
2) If the layer is named "fillMe" then color it in a specific color but lock the transparent pixels (in German it's called "Transparente Pixel fixieren")
I imagine that there might be several ways to go about this. Maybe applying a "Color Overlay" layer style with the desired color would work.
I have tried to find a good solution but cannot find any information on how to lock the pixel transparency with code. Also I would like to access a color picker window for the color selection.
Could you kindly direct me to the right tutorials/resources?
Thank you in advance!
Edit: So far I have got this with the help of the Script Listener, but it won't run as "this function might not be available in the new version of Photoshop"
function showBounds(layerNode) {   
    for (var i=0; i<layerNode.length; i++) {
        showBounds(layerNode[i].layerSets);
        for(var layerIndex=0; layerIndex < layerNode[i].artLayers.length; layerIndex++) {
            var layer=layerNode[i].artLayers[layerIndex];
            if (layer.name == "fillMe") {
                layer.visible = 1;
                layer.transparentPixelsLocked = 1;
                var idFl = charIDToTypeID( "Fl  " );
                var desc8 = new ActionDescriptor();
                var idUsng = charIDToTypeID( "Usng" );
                var idFlCn = charIDToTypeID( "FlCn" );
                var idFrgC = charIDToTypeID( "FrgC" );
                desc8.putEnumerated( idUsng, idFlCn, idFrgC );
                executeAction( idFl, desc8, DialogModes.NO );
showBounds(app.activeDocument.layerSets);

Answer 1

Hi, thank you for your help!
However, I'm having problems running the script. The first time it runs on a photoshop file it works fine, deletes all Color Overlay styles from "fillMe" layers and fills the according layers with the foreground color.
When it runs a second time it always stops with the prompt "The command 'delete layer style' is momentarily not available" (or the German counterpart to that sentence).
I tried to incorporate your code into mine, but I don't know what I'm doing wrong...
function recolor(layerNode) {   
    for (var i=0; i<layerNode.length; i++) {
        recolor(layerNode[i].layerSets);
        for(var layerIndex=0; layerIndex < layerNode[i].artLayers.length; layerIndex++) {
            var layer=layerNode[i].artLayers[layerIndex];
            if (layer.name == "fillMe") {
                layer.visible = 1;
                layer.transparentPixelsLocked = 1;
                app.activeDocument.activeLayer = layer;
                var ref = new ActionReference();
                ref.putEnumerated( charIDToTypeID("Lyr "), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );
                var layerDesc = executeActionGet(ref);
                if (layerDesc.hasKey(stringIDToTypeID('layerEffects')) == true) {
                    delColOverlay();
                fillWithNewColor();
                app.runMenuItem(stringIDToTypeID('selectNoLayers'));
function fillWithNewColor(){
    var idFl = charIDToTypeID( "Fl  " );
    var desc137 = new ActionDescriptor();
    var idUsng = charIDToTypeID( "Usng" );
    var idFlCn = charIDToTypeID( "FlCn" );
    var idFrgC = charIDToTypeID( "FrgC" );
    desc137.putEnumerated( idUsng, idFlCn, idFrgC );
    executeAction( idFl, desc137, DialogModes.ALL );
function delColOverlay(){
    var iddsfx = charIDToTypeID( "dsfx" );
    var desc173 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
    var ref77 = new ActionReference();
    var idSoFi = charIDToTypeID( "SoFi" );
    ref77.putClass( idSoFi );
    var idLyr = charIDToTypeID( "Lyr " );
    var idOrdn = charIDToTypeID( "Ordn" );
    var idTrgt = charIDToTypeID( "Trgt" );
    ref77.putEnumerated( idLyr, idOrdn, idTrgt );
    desc173.putReference( idnull, ref77 );
    executeAction( iddsfx, desc173, DialogModes.ALL );   
recolor(app.activeDocument.layerSets);