Script to check, if primary text frame is used on specific page

Hi Tobias , Not sure if someone can come up with something simpler, but try this:

var pgs = app.activeDocument.pages;
var tf, pfs;

for (var i = 0; i < pgs.length; i++){
    tf = pgs[i].textFrames;
    for (var j = 0; j < tf.length; j++){
        if (tf[j].overridden) {
            //get an array of primary frame ids from the frame’s master spread
            pfs = getPrimaryFrames(tf[j].overriddenMasterPageItem.parent);
            //checks if the overridden text frame id is in the primary frames array
            if (checkItem(pfs, tf[j].overriddenMasterPageItem.id)) {
                $.writeln("this text frame is primary")
            } 
        } 
    };   
};   



/**
* Get a list of a master spread’s primary text frame’s ids 
* @ param the master spread to check 
* @ return an array of ids 
* 
*/
function getPrimaryFrames(ms){
    var pf = ms.primaryTextFrame;
    var a = [pf.id]
    while (pf !=null) {
       pf = pf.nextTextFrame;
       try {a.push(pf.id)}catch(e) {}  
    }
    return a
}


/**
* Checks if an item is in an array
* @ param the array to check 
* @ param the item to look for 
* @ return true if the item is in the array 
* 
*/
function checkItem(a, obj) {
    for (var i = 0; i < a.length; i++) {
        if (a[i] === obj) {
            return true;
        }
    }
    return false;
}