Check if the color sampler is present

[Geppetto Luis]

I tried this solution but it does not work

Where am I doing wrong

var doc = activeDocument; 

try{ 

   if (activeDocument.colorSamplers.length > 0)

   {alert ("color sampler/s exist/s")};

     } 

catch(){ 

       {alert ("color sampler/no exist")};

     }

[Kukurykus]

Simple activeDocument.colorSamplers.length is sufficent.

But if you want try/catch worked you have to add missing value inside rounded brackets, for ex. catch(err)

[Geppetto Luis]

tried it too but it does not work?

var doc = activeDocument;

try{

   if (activeDocument.colorSamplers.length > 0)

   {alert ("color sampler/s exist/s")};

     }

catch(e){

       {alert ("color sampler/no exist")};

     }

[c.pfaffenbichler · Accepted solution]

Why do you use the try-clause?

As long as a file is open you should be able to use the »else« of the »if«.

if (activeDocument.colorSamplers.length > 0) {alert ("color sampler/s exist/s")}

else {alert ("color sampler/no exist")};

[Geppetto Luis]

I thought the best way was to try

now I learned another thing

Thank you

[c.pfaffenbichler]

To use a try clause in a case like this it should include something that is possible only if the desired »thing« exists.

In this case you could define a variable from the first ColorSampler which would throw an error if no ColorSamplers exist.

#target photoshop

var doc = activeDocument;

try {

var theColorSampler = doc.colorSamplers[0];

alert ("color sampler/s exist/s")

} catch (e) {

alert ("color sampler/no exist")

};

[r-bin]

Alternative way )

alert( has_property("document", "colorSamplerList") )
function has_property(class_name, prpr_name)
    {
    try
        {
        var r = new ActionReference();
        r.putProperty(charIDToTypeID("Prpr"), stringIDToTypeID(prpr_name));
        r.putEnumerated( stringIDToTypeID( class_name ), charIDToTypeID("Ordn"), charIDToTypeID("Trgt"));
        if (executeActionGet(r).hasKey(stringIDToTypeID(prpr_name))) return true;
        return false;
        }
    catch (e) { alert(e); }
    }