getting "ReferenceError: Object is invalid" while resetting a listBox

[drorlazar]

Hi

i'm trying to create a refresh button for a list (that shows the render Q better for my needs). it works fine, i'm removing all the list items and then re-entering them. for some reason when i click the same refresh button for the 6th/7th time i'm getting:

ReferenceError: Object is invalid

(it seems to be related to line 66 in the code - " curItem = folderPathListbox.add ('item', renderItem.toString());    // Column 1")

any help?

i'm lost here...

attached are the JSX and a sample project i use to test it:

thanks

D

here's the code:

 try{
function createUserInterface (thisObj,userInterfaceString,scriptName){
            var pal = (thisObj instanceof Panel) ? thisObj : new Window("palette", scriptName,
                                        undefined,{resizeable: true});
            if (pal == null) return pal;
            var UI=pal.add(userInterfaceString);
            pal.layout.layout(true);
            pal.layout.resize();
            pal.onResizing = pal.onResize = function () {
                                                            this.layout.resize();
                                                            }
            if ((pal != null) && (pal instanceof Window)) {
                    pal.show();
            }
    return UI;
};
{var res ="group {orientation:'column',\
                                    alignment:['fill','fill'],\
                                    alignChildren:['fill','top'],\
                                    headerText:StaticText {text:'Render Q lister', alignment:'center'},\
                                    buttonGroup: Group{\
                                                                alignment:['center','top']\
                                                                refButton: Button{text:'Refresh'}\
                                                                dupButton: Button{text:'Duplicate Selected'}\
                                                                selButton: Button{text:'Select in renderQueue'}\
                                                                expButton: Button{text:'Export to File'}\
                                                                }\
                                    folderPathListbox:ListBox{\
                                                            alignment:['fill','fill'],\
                                                            properties:{\
                                                                            multiline:true,\
                                                                            multiselect:true,\
                                                                            numberOfColumns:5,\
                                                                            showHeaders:true,\
                                                                            columnTitles: ['Render #','Date','Time', 'Comp Name', 'Render Path']\
                                                                            }\
                                                            },\
                        }";
}
function listRQ (rqList){
    try{
            var folderPathListbox = rqList;
            var proj = app.project;
            var totalRenderQ = proj.renderQueue.numItems;
            for(var i= 1; i<=totalRenderQ;  i++){
                    var totalOM= proj.renderQueue.item(i).numOutputModules;
                     for (var om= 1; om<=totalOM; om++){
                                    var dateList, timeList, curItem, renderItem;
                                    renderItem =  "Render #" + i + " - " + om ;
                                    if (proj.renderQueue.item(i).startTime != null){
                                                var min = proj.renderQueue.item(i).startTime.getMinutes() <10 ? "0"+ proj.renderQueue.item(i).startTime.getMinutes() : proj.renderQueue.item(i).startTime.getMinutes();
                                                var year = proj.renderQueue.item(i).startTime.getFullYear().toString().substr (-2,2);
                                                timeList = (proj.renderQueue.item(i).startTime.getHours()-1)+":" + min; 
                                                dateList =proj.renderQueue.item(i).startTime.getDate()+"/"+(proj.renderQueue.item(i).startTime.getMonth()+1)+"/"+year ;
                                    }else{      
                                            dateList = "not rendered";
                                            timeList = "    ";
                                        }
                                    curItem = folderPathListbox.add ('item', renderItem.toString());    // Column 1
                                    curItem.subItems[0].text = dateList.toString();                         // Column 2
                                    curItem.subItems[1].text = timeList.toString();                          // Column 3
                                    curItem.subItems[2].text = proj.renderQueue.item(i).comp.name; // Column 4
                                    curItem.subItems[3].text = proj.renderQueue.item(i).outputModule(om).file.toString().replace(new RegExp(",","g"), "\r").replace(new RegExp("%20","g"), " ").replace(new RegExp("%5B","g"), "[").replace(new RegExp("%5D","g"), "]"); // Column 5    
                                }
            }
          }catch(err){alert(err)}
    return folderPathListbox;
    }
var UI = createUserInterface(this,res,"Better RQ");
var myList = UI.folderPathListbox;
var lsRq = listRQ(myList);
{ // buttons action
UI.buttonGroup.refButton.onClick = function () {
                                                                        lsRq.removeAll();
                                                                        lsRq = listRQ(myList);
    }
UI.buttonGroup.dupButton.onClick = function () {
    alert ("Dup");
    }
UI.buttonGroup.selButton.onClick = function () {
    alert ("Sel");
    }
UI.buttonGroup.expButton.onClick = function () {
    alert ("Exp");
    }
}
}
catch(err){ 
    alert ("Error at line # " + err.line.toString() + "\r" + err.toString());
    }

[Arie Stavchansky]

"Object is invalid" usually means that the object or item no longer exists.  it might be that you are deleting something before you hit the button for the sixth or seventh time.  Make sure that any loops in your code don't reference a render queue item that doesn't exist.  You could also benefit by placing a break point near where the code is error'ing and step through the lines of code to see where the issue is.

If you say it's coming from around line 66, then it might be that renderItem is in fact non-existant.

Hope this helps!

—Arie

[drorlazar]

i figured it out.. it seems that if you try to run the code from extend script it will crush (in different times) but if you run the script via Window menu from within after it'll run just fine..

thanks

D