Get the current zoom of the document.

[Shulipa Bernad]

Hello people!
How to get the current zoom of the document.
I'm trying to add two buttons to control the zoom value, but I need the initial value.
So far I have this, I still need to get the initial value

#target photoshop;  
z=100; // the initial value is missing
dlg = new Window("dialog"); dlg.text = "Dialog"; 
b1 = dlg.add("button", undefined, undefined, {name: "b1"}); b1.text = "+"; 
b2 = dlg.add("button", undefined, undefined, {name: "b2"}); b2.text = "-"; 

checkbox1 = dlg.add("checkbox", undefined, undefined, {name: "checkbox1"}); 
checkbox1.text = "Checkbox"; 

b1.onClick = function() {z= z+15; zoomDocs(z);}; 
b2.onClick = function() {z= z -15; zoomDocs(z);};

dlg.show();

function zoomDocs(z){
if(documents.length){  
var startRulerUnits = preferences.rulerUnits;  
app.preferences.rulerUnits = Units.INCHES;  
var Width = app.activeDocument.width;  
 setZoom (z);  
preferences.rulerUnits = startRulerUnits;  
};      
function setZoom( zoom ) {    
    if(zoom < 1 ) zoom =1;    
    var ref = new ActionReference();    
    ref.putEnumerated( charIDToTypeID("capp"), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );    
    var getScrRes = executeActionGet(ref).getObjectValue(stringIDToTypeID('unitsPrefs')).getUnitDoubleValue(stringIDToTypeID('newDocPresetScreenResolution'))/72;    
    var docRes = activeDocument.resolution;    
    activeDocument.resizeImage( undefined, undefined, getScrRes/(zoom/100), ResampleMethod.NONE );    
    var desc = new ActionDescriptor();    
    ref = null;    
    ref = new ActionReference();    
    ref.putEnumerated( charIDToTypeID( "Mn  " ), charIDToTypeID( "MnIt" ), charIDToTypeID( 'PrnS' ) );    
    desc.putReference( charIDToTypeID( "null" ), ref );    
    executeAction( charIDToTypeID( "slct" ), desc, DialogModes.NO );    
    activeDocument.resizeImage( undefined, undefined, docRes, ResampleMethod.NONE );    
   }; 
}

[c.pfaffenbichler]

I think @DBarranca provided this a while ago: 

/* 
* Retrieve the Zoom % 
*  {Number} Zoom value (%) 
*/  
getZoom = function() {  
  var ref;  
  ref = new ActionReference();  
  ref.putProperty(s2t("property"), s2t("zoom"));  
  ref.putEnumerated(s2t("document"), s2t("ordinal"), s2t("targetEnum"));  
  return executeActionGet(ref).getUnitDoubleValue(s2t("zoom")) * 100;  
};  

[Shulipa Bernad]

Can you get the zoom value with this script?

[c.pfaffenbichler · Accepted solution]

Seems I forgot a (sub-)function: 

var aaa = getZoom();
alert (aaa);
/* 
* Retrieve the Zoom % 
*  {Number} Zoom value (%) 
*/  
function getZoom () {  
  var ref;  
  ref = new ActionReference();  
  ref.putProperty(s2t("property"), s2t("zoom"));  
  ref.putEnumerated(s2t("document"), s2t("ordinal"), s2t("targetEnum"));  
  return executeActionGet(ref).getUnitDoubleValue(s2t("zoom")) * 100;  
};
function s2t (s) {  
    return app.stringIDToTypeID(s);  
  }; 

[Shulipa Bernad]

Great support, now it worked well! I had tested the first script and nothing was happening. Thanks c.pfaffenbichler .

[c.pfaffenbichler]

You’re welcome. 

As I mentioned I had forgotten stuff in the first post.