Can only determine non existence, but cannot determine non existence?

Question

I need to determine if a paragraph style group exists. Generally, this avoids the judgment of non existence:


//This is the previous practice of using else to determine 'non-existent' in reverse
var d = app.activeDocument;
var item = d.selection[0];
if(d.paragraphStyleGroups.itemByName('AA').isValid){
var myGroup=d.paragraphStyleGroups.itemByName('AA');
alert('AA exist')
}
else{
alert('AA dose not exist')
}

But sometimes I need to directly determine that it doesn't exist and find that both of the following are invalid:

//Now I want to directly determine that 'AA' does not exist.
var d = app.activeDocument;
var item = d.selection[0];
if(d.paragraphStyleGroups.itemByName('AA').inValid){
alert('group does not exist');
}

if(!d.paragraphStyleGroups.itemByName('AA').isValid){
alert('group does not exist');
}

rob day · Accepted Answer

My code is not working.I think you need a recursive function than calls itself because nested style groups can be any number of groups deep, so something like this.//an array of all paragraph style namesvar g = GetOSGroups(app.activeDocument)alert("All Paragraph Style Groups " + g)//Check if style named AAA exists—returns truealert("Item named AAA exists: " + checkItem(g, "AAA"))/*** Get an array of all paragraph style group names—function calls itself to get nested groups* @ param the document to check * @ returns an array of the document’s paragraph group names*/function GetOSGroups(f) {var a = []    var osg = f.paragraphStyleGroups.everyItem().getElements()    var gr for (var i = 0; i < osg.length; i++) {gr = osg[i];        if (gr.paragraphStyleGroups.everyItem().getElements().length > 0) {            a.push(gr.name)            a = a.concat(GetOSGroups(gr))        } else {            a.push(gr.name)        }}    return a}/*** Checks if an item is in an array* @ param the array to check * @ param the item to search 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;}Result:

Manan Joshi · Answer

What do you mean ​@dublove? Your title is confusing you say you can and then you say you can’t. Add more details, probably a file, code snippet, what you get and what you want would help in leading you to an answer.

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