Logic function triggered by entering the framework returned error #1009

I have five boxes to click on a screen (buttons with an area of key but no picture).  If a user clicks on a box for the first time, a graphic tick appears and a variable is set to True.  If the user clicks on the box again once the tick disappears and the variable is set to false.

When the user clicks the next button the next slide will vary according to which the variables are set to True.

That's all works fine, but if I go forward and then back to my frame, the ticks disappear.  I tried to create a new function to run as soon as I returned to the image, check if the variables are set to True or False and show appropriate ticks.  It works and there is no error when I run at the beginning of the film.  But when I click on the next button to leave the framework (framework 5) I get a lot of messages like this:

TypeError: Error #1009: cannot access a property or method of a null object reference.
[file name]: [(MainTimeline/ticksInBoxes)
[filename]. MainTimeline::frame5:20]

Here is the corresponding code on picture 5:

addEventListener (Event.ENTER_FRAME, ticksInBoxes);

btnNextS1Start.addEventListener (MouseEvent.CLICK, S1NavForward);

functionticksInBoxes(event:Event):void

{

If (newtopic == false) {}

box1Tick.visible = false;
the row above this point is part 5, line 20, mentioned by the output message

} else {}

box1Tick.Visible = true;

}

If (NCO == false) {}

box2Tick.visible = false;

} else {}

box2Tick.Visible = true;

}

If (change == false) {}

box3Tick.visible = false;

} else {}

box3Tick.Visible = true;

}

If (recycling == false) {}

box4Tick.visible = false;

} else {}

box4Tick.Visible = true;

}

If (badprac == false) {}

box5Tick.visible = false;

} else {}

box5Tick.Visible = true;

}

}

functionTopNew(event:MouseEvent):void

{

If (newtopic == false) {}

newtopic = true;

box1Tick.Visible = true;

} else {}

box1Tick.visible = false;

}

}

functionTopNC(event:MouseEvent):void

{

If (NCO == false) {}

eyeing = true;

box2Tick.Visible = true;

} else {}

eyeing = false;

box2Tick.visible = false;

}

}

functionTopCha(event:MouseEvent):void

{

If (change == false) {}

changes = true;

box3Tick.Visible = true;

} else {}

changes = false;

box3Tick.visible = false;

}

}

functionTopRef(event:MouseEvent):void

{

If (recycling == false) {}

recycling = true;

box4Tick.Visible = true;

} else {}

recycling = false;

box4Tick.visible = false;

}

}

functionTopBad(event:MouseEvent):void

{

If (badprac == false) {}

badprac = true;

box5Tick.Visible = true;

} else {}

badprac = false;

box5Tick.visible = false;

}

}

function S1NavForward(event:MouseEvent):void

{

If (newtopic == true) {}

gotoAndStop (6);

} ElseIf (NCO == true) {}

gotoAndStop (7);

} Else if (change == true) {}

gotoAndStop (8);

} ElseIf (recycling == true) {}

gotoAndStop (9);

} Else if (badprac == true) {}

gotoAndStop (10);

} else {}

trace ("nothing is selected");

}

}

And here is the code on picture 6:

btnNextNew.addEventListener (MouseEvent.CLICK, S1NavFromNew);

btnPrevNew.addEventListener (MouseEvent.CLICK, S1NavBackFromNew);

function S1NavFromNew(event:MouseEvent):void

{

If (NCO == true) {}

gotoAndStop (7);

} Else if (change == true) {}

gotoAndStop (8);

} ElseIf (recycling == true) {}

gotoAndStop (9);

} Else if (badprac == true) {}

gotoAndStop (10);

} else {}

gotoAndStop (11);

}

}

function S1NavBackFromNew(event:MouseEvent):void

{

gotoAndStop (5);

}

I worked there.

I looked at http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/events/Event.html #ENTER_FRAME , who said that "this event has a"capture phase"nor a"bubble phase", which means that event listeners must be added directly to all targets potential, if the target is on the display list or not.

So what I did is to change the event listener to say "box1Tick.addEventListener (Event.ENTER_FRAME, ticksInBoxes);".  Add this reference to one of the boxes used in the service was enough to get rid of the error message, even if the way in which the function ran did not this specific box visible.

Huzzah!

Tags: Adobe Animate

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