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H
Heimdaal
Inspiring
August 10, 2016
Answered

Creating history snapshots - code not working

  • August 10, 2016
  • 1 reply
  • 513 views

I got this code from the forums here - just did some minor cleanup (using stringIDToTypeID instead of charIDToTypID which isn't as readable).

But this code doesn't execute. It runs fine up till the point where I call executeAction() - what is wrong? JSX code below!

Create

function sTID(s) { return stringIDToTypeID(s); };
function createSnapshot(name){
// Creates a history snapshot. Not possible via DOM - have to use Action Manager
    alert("inside createSnapshot");
    var desc = new ActionDescriptor();
    var ref1 = new ActionReference();
    var ref2 = new ActionReference();
    ref1.putClass( sTID("Snapshot") );
    desc.putReference( sTID("Null"), ref1 );
    ref2.putProperty( sTID("HistoryState"), sTID("CurrentHistoryState") );
    desc.putReference( sTID("From"), ref2 );
    desc.putString( sTID("Name"), name );
    desc.putEnumerated( sTID("Using"), sTID("HistoryStateSource"), sTID("FullDocument") );
    executeAction( sTID("Make"), desc, DialogModes.NO ); // Script halts here
}

HistoryState and HistoryStateSource has a conflicting CharID "HstS" so naturally I've tested all 4 possible setups there - neither one works!

Other functions (untested):

Set

function setSnapshot(name){
// Sets the history to a previous snapshot. Not possible via DOM - have to use Action Manager
    alert("inside setSnapshot");
    var desc = new ActionDescriptor();
    var ref = new ActionReference();
    ref.putName( sTID("Snapshot"), name );
    desc.putReference( sTID("Null"), ref );
    executeAction( sTID("Select"), desc, DialogModes.NO );
    alert("reverted snapshot");
}

Delete

function removeSnapshot(name){
// Removes a history snapshot. Not possible via DOM - have to use Action Manager
    alert("inside removeSnapshot");
    var desc = new ActionDescriptor();
    var ref = new ActionReference();
    ref.putName( sTID("Snapshot"), name );
    desc.putReference( sTID("Null"), ref );
    executeAction( sTID("Delete"), desc, DialogModes.NO );
    alert("removed snapshot");
}
This topic has been closed for replies.
Correct answer SuperMerlin

You have all the names wrong.

function createSnapshot(name){  
function sTID(s) { return stringIDToTypeID(s); }; 
    var desc = new ActionDescriptor();  
    var ref1 = new ActionReference();  
    var ref2 = new ActionReference();  
    ref1.putClass( sTID("snapshotClass") );  
    desc.putReference( sTID("null"), ref1 );  
    ref2.putProperty( sTID("historyState"), sTID("currentHistoryState") );  
    desc.putReference( sTID("from"), ref2 );  
    desc.putString( sTID("name"), name );  
    desc.putEnumerated( sTID("using"), sTID("historyState"), sTID("fullDocument") );  
    executeAction( sTID("make"), desc, DialogModes.NO ); 
};

Allways check what the stringId of a charId is by using:-

$.writeln(typeIDToStringID(charIDToTypeID('From')));

1 reply

SuperMerlin
SuperMerlinCorrect answer
Inspiring
August 10, 2016

You have all the names wrong.

function createSnapshot(name){  
function sTID(s) { return stringIDToTypeID(s); }; 
    var desc = new ActionDescriptor();  
    var ref1 = new ActionReference();  
    var ref2 = new ActionReference();  
    ref1.putClass( sTID("snapshotClass") );  
    desc.putReference( sTID("null"), ref1 );  
    ref2.putProperty( sTID("historyState"), sTID("currentHistoryState") );  
    desc.putReference( sTID("from"), ref2 );  
    desc.putString( sTID("name"), name );  
    desc.putEnumerated( sTID("using"), sTID("historyState"), sTID("fullDocument") );  
    executeAction( sTID("make"), desc, DialogModes.NO ); 
};

Allways check what the stringId of a charId is by using:-

$.writeln(typeIDToStringID(charIDToTypeID('From')));
    H
    HeimdaalAuthor
    Inspiring
    August 11, 2016

    Thanks a bunch. That certainly helps - especially that last line of code.
    I can't get this to work with my setSnapshot -function though. I've changed the stringID's to lowercase and I'm using "snapshotClass":

    function sTID(s) { return stringIDToTypeID(s); };
    var desc = new ActionDescriptor();
    var ref = new ActionReference();
    ref.putName( sTID("snapshotClass"), name ); // I've also tried the stringID "snapshot". The variable name is just a string with the snapshot name
    desc.putReference( sTID("null"), ref );
    executeAction( sTID("select"), desc, DialogModes.NO );
    SuperMerlin
    SuperMerlin
    Inspiring
    August 11, 2016

    This works for me..

    function setSnapshot(name){  
            function sTID(s) { return stringIDToTypeID(s); }; 
            var desc = new ActionDescriptor();  
            var ref = new ActionReference();  
            ref.putName( sTID("snapshotClass"), name );  
            desc.putReference( sTID("null"), ref );       
            executeAction( sTID("select"), desc, DialogModes.NO );   
    };
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