If history state name exists, delete

Skrippy · Post by **Skrippy** » Thu Dec 06, 2012 7:07 am

Been trying for a while to just do this:

Check if a named history state exist.
If yes, delete it.

Things like these are not working...

Code: Select allIf ( app.activeDocument.historyStates.getByName('history state name') ) {
app.activeDocument.historyStates.getByName('history state name').remove();
}

Thanks for any help

pfaffenbichler · Post by **pfaffenbichler** » Thu Dec 06, 2012 7:43 am

According to ESTK’s Object Model Viewer HistoryState has no Method »remove« – what made you think it does?

You could try recording the Action Manager code with ScriptingListener.plugin to see if that can be adapted to your needs.

Skrippy · Post by **Skrippy** » Thu Dec 06, 2012 8:29 am

Just trying to find a solution with sweat and instinct. Usally get there or halfway

Skrippy · Post by **Skrippy** » Thu Dec 06, 2012 11:57 am

When I right click an unselected history state and select Delete, it gets me to something like this:

Code: Select allfunction deleteHistoryState( HistoryStateName ) {
var idslct = charIDToTypeID( "slct" );
var desc153 = new ActionDescriptor();
var idnull = charIDToTypeID( "null" );
var ref123 = new ActionReference();
var idSnpS = charIDToTypeID( "SnpS" );
ref123.putName( idSnpS, HistoryStateName );
desc153.putReference( idnull, ref123 );
executeAction( idslct, desc153, DialogModes.NO );
}
However, when called it just selects the state w/o deleting it...
Even if it should work, it doesn't respect the current active state.

All seems to lead to a wrong path...

Easier for my application would be if I could make a snapshot named "snapshot" that doesn't ask to "overwrite?" a previous "snapshot" if one is there. It should overwrite w/o asking.
Is that easy?

Mike Hale · Post by **Mike Hale** » Thu Dec 06, 2012 8:37 pm

The code you posted does not delete the snapshot because it is code for selecting a snapshot. That is why it has this line
var idslct = charIDToTypeID( "slct" );

To delete the snapshot you need to create an executeAction using charIDToTypeID('Dlt ') which is the delete ID

Code: Select allfunction removeNamedSnapshot(name) {
try{
var desc = new ActionDescriptor();
var ref = new ActionReference();
ref.putName( charIDToTypeID('SnpS'), name );
desc.putReference( charIDToTypeID('null'), ref );
executeAction( charIDToTypeID('Dlt '), desc, DialogModes.NO );
}catch(e){};
};

Skrippy · Post by **Skrippy** » Sat Dec 08, 2012 12:29 am

Thank you Mike!

However, I believe there may be an easier way to get what I want.

Can I either:

- just rename a named layer? (if layer exists, rename) Seems cleanest solution.
or
- overwrite a named layer w/o "overwrite?" dialog? (if the previous is not possible)

I will try your solution, but it will probably give me problems reselecting the previous state.

update: I was wrong. It seems to work perfectly as is and leaves my current state untouched! Thanks again!