First basic utility script

I want to write a script that watches for a token to be moved, and any time it is moved it makes sure the bars are set. It doesn't seem to be working. Since I'm not familiar with the API, it's difficult to tell if I'm not properly packaging my instructions, or if my instructions are incorrect. Any ideas? on("change:graphic",function(obj) {     if (obj.get("bar1_link")==""){         obj.set("bar1_link","hp_temp");         obj.set("bar2_link","ac");         obj.set("bar3_link","hp");     } }) EDIT: I'm also trying to get the script to check to see if gender is set on the linked character. Since that is a custom attribute that I'm adding, how do I if () test for whether an attribute exists? for this, I imagine:    having to API test to see if gen1 exists on the character that the selected token represents    call a macro to pull up a dialog to ask what the gender should be    have the macro run a chat string that would be parsed to set the gender of the token.

The values for barN_link need to be the ID values of an Attribute object, not the name of an attribute.

So, this should work, then? This did not work on("change:graphic",function(obj) {     if (obj.get("represents")!=""){         var character = getObj("character", obj.get("represents"));         if (obj.get("bar1_link")==""){             obj.set("bar1_link",getAttrByName(character.id,"hp_temp"));             obj.set("bar2_link",getAttrByName(character.id,"ac"));             obj.set("bar3_link",getAttrByName(character.id,"hp"));         }     } })

Looks like it.

I have it working now, It links the bar with the stat correctly, but the values are not updating correctly.  on("change:graphic",function(obj) {     var character = getObj("character", obj.get("represents")); //successfully retrieves character ID for current model     if (obj.get("represents")!=""){        if (obj.get("bar1_link")==""||obj.get("bar2_link")==""||obj.get("bar3_link")==""){             sendChat(character.get("name"),"/w GM My bars were not correctly linked, so I fixed that.")             obj.set("bar1_link","sheetattr_hp_temp");             var armorClass= findObjs({                 _type: "attribute",                 _characterid: character.id,                 name: "ac"             });             obj.set("bar2_link",armorClass[0].id);             var hitPoints= findObjs({                 _type: "attribute",                 _characterid: character.id,                 name: "hp"             });             obj.set("bar3_link",hitPoints[0].id);         }        if (obj.get("bar1_value")==""||obj.get("bar2_value")==""||obj.get("bar3_value")==""){             sendChat(character.get("name"),"/w GM Help! My bar values are not correctly set: Bar1: "+obj.get("bar1_value")+" Bar2: "+obj.get("bar2_value")+" Bar3: "+obj.get("bar3_value"));                   }     }