on("change:campaign:turnorder") firing twice

I have created the following test script function DoSomething(){     sendChat('Crawler','DoSomething triggered'); } on("change:campaign:turnorder", function(obj){         sendChat('Crawler','on event triggered');         DoSomething(); }); When I add tokens manually to the turnorder and click to advance turn for the first time, my on Change Event fires twice. Then when I further adavance the turn, it fires once. Why does it fire twice the first time and what can I do to prevent this. I would like DoSomething to fire only when I click on the button to advance the turn.

My guess is its triggering once because a character is added to the turnorder (which immediately changes the turnorder), and then again for the advance turn. You can probably prevent this, but I cant offer suggestions without knowing what you intend the doSomething script is intended to do. You can use this to examine the turnorder contents: on("change:campaign:turnorder", function(obj){         sendChat('Crawler',JSON.stringify(obj));         log(JSON.stringify(obj)); });

I just want DoSomething to send something to the Chat to show it has been triggered. the on event fires everytime I add a token to the turn order but, once I have finished adding the tokens, when I press the advance turn button, it fires twice but only once after that. I will play with the turnorder content using the script you kindly provided.

One way to solve the problem would be to check if the active character has changed, sent to chat.  You can do on("change:campaign:turnorder", function(obj, prev){ with prev being the state before the change. Get the active character from both, and if it has changed, then send your message to chat.

Here's a quick-and-dirty expansion to your script: function DoSomething(){ sendChat('Crawler','DoSomething triggered'); } on("change:campaign:turnorder", function(obj, prev){ const neworder =Campaign().get("turnorder") ? JSON.parse(Campaign().get("turnorder")) : []; const oldorder = prev.turnorder ? JSON.parse(prev.turnorder) : []; const newid = (neworder.length > 0) ? neworder[0].id : ''; const oldid = (oldorder.length > 0) ? oldorder[0].id : ''; if(newid && oldid && (newid != oldid)) { DoSomething(); } }); It gets the id of the first person in the turn tracker, from the current turnorder, and the turnorder just before it changed. It then compares the ids, and if they are different, does your DoSomething. There were a couple of complications: handling when you cleared the turn tracker, or when there was only one person in the tracker. But in my testing, this works now.