var objStyleName = "Mein Objektformatname"; 
 
var doc = app.activeDocument; 
var objectStyle = doc.objectStyles.itemByName( objStyleName ); 
if(!objectStyle.isValid){ alert("Objektformat nicht gefunden. Abbruch."); exit() }; 
 
// Beispiel Seite 1 des aktiven Dokuments: 
var allPageItemsOfPage1 = doc.pages[0].allPageItems; 
 
// Schleife: 
for(var n=0;n<allPageItemsOfPage1.length;n++) 
{ 
	if(allPageItemsOfPage1[n].appliedObjectStyle == objectStyle) 
	{ 
		// Was mit dem gefundenen Objekt passieren soll: 
		doSomethingReasonable( allPageItemsOfPage1[n] ); 
	}; 
} 
 
function doSomethingReasonable( pageItem ) 
{ 
	alert("Rotate me!"+"\r"+pageItem.id+"\r"+pageItem.parent.constructor.name); 
}; 

var allPageItemsOfSpread1 = doc.spreads[0].allPageItems; 

 // Allen vorhandenen Textrahmen  mit Objektformat  "artikelnummer" um 90° drehen // 
var allFrames = app.activeDocument.textFrames; 
var nFrames   = allFrames.length; 
 
for (var n=0; n<nFrames; n++) { 
	var curFrame = allFrames[n]; 
	if (curFrame.appliedObjectStyle.name == "artikelnummer") { 
		curFrame.rotationAngle = 90; 
	} 
} 

 // Allen vorhandenen Textrahmen  mit Objektformat  "artikelnummer" um 90° drehen // 
var allFrames = app.activeDocument.textFrames; 
var nFrames   = allFrames.length; 
 
for (var n=0; n<nFrames; n++) { 
	var curFrame = allFrames[n]; 
	if (curFrame.appliedObjectStyle.name == "artikelnummer") { 
		curFrame.rotationAngle = 90; 
	} 
} 

// The active document: 
var doc = app.documents[0]; 
var nameOfObjectStyle = "artikelnummer"; 
 
// Where is the rotation's center? 
doc.layoutWindows[0].transformReferencePoint = AnchorPoint.CENTER_ANCHOR; 
 
var allStories = doc.stories.everyItem().getElements(); 
var objectStyle = doc.objectStyles.itemByName(nameOfObjectStyle); 
 
// In case you run this script the first time and are too lazy to add an object style: 
if(!objectStyle.isValid) 
{  
	var objectStyle = app.documents[0].objectStyles.add({name : nameOfObjectStyle}); 
}; 
 
// Loop all stories: 
for(var n=0;n<allStories.length;n++) 
{ 
	var textContainers = allStories[n].textContainers; 
 
	// Loop all text containers of a particular story: 
	for(var c=0;c<textContainers.length;c++) 
	{ 
		// Only text frames, no text paths 
		// And only text frames with our defined object style applied from above: 
		if(textContainers[c].constructor.name == "TextFrame" && textContainers[c].appliedObjectStyle == objectStyle) 
		{ 
			// Rotate the text container: 
			textContainers[c].rotationAngle = 90; 
		}; 
	}; 
};