jsfl, 'swapElement' requires a selection.

[kilopop2000]

When selecting a timeline from a library symbol with 'dom.library.getSelectedItems()[0].timeline', 'swapElement' throws the error ''swapElement' requires a selection', even though it has been selected and does exist with fl.trace("element = " + element + " selected = " + element.selected)  = 'element = [object SymbolInstance] selected = true'. 

Any ideas? Here's the code.

var dom = fl.getDocumentDOM();
var tl = dom.getTimeline();

dom.library.selectItem("main") 
var seqTL		= dom.library.getSelectedItems()[0].timeline;	
var seqLayers 		= seqTL[1];
	
var element = seqLayers[0].frames[0].elements[0];
element.selected = true
fl.trace("element = " + element + " selected = " + element.selected) 
fl.getDocumentDOM().swapElement('Symbol 1');

[Vladin M. Mitov · Accepted solution]

Hi,
Unfortunately, setting the selected property of an element, that is not in the current timeline, do not affect the selection property of the document. You can try to add to your code the following line:

fl.trace( dom.selection );

and you'll notice that even though the element is selected, the selection property of the document is empty.
So, you need to place the symbol "main" on the stage, make its timeline a current one and do the symbol swap in that timeline.

var dom = fl.getDocumentDOM();

dom.library.addItemToDocument( {x:0, y:0}, "main" );

dom.enterEditMode( "inPlace" );
	var seqTL = dom.getTimeline();
	var seqLayers = seqTL[1];
	var element = seqLayers[0].frames[0].elements[0];
	element.selected = true;
	fl.getDocumentDOM().swapElement( "Symbol 1" );
dom.exitEditMode();

dom.deleteSelection();

[kilopop2000]

Thanks Vladin, that works even though it seems like a work-around. Interestingly, you can set the selected property of an element that is not in the current timeline by adding a new element into the same layer and frame as an existing element. Then delete that new element, and suddenly you can access that existing element. Any ideas why this now works?

var dom = fl.getDocumentDOM();
var tl = dom.getTimeline();

dom.library.selectItem("main") 
var seqTL = dom.library.getSelectedItems()[0].timeline;	
var seqLayers = seqTL[1];

///////////////////////
		
// Select the layer and frames
seqTL.setSelectedLayers(0)
seqTL.currentLayer = 0

// Add 'Symbol 1' into layer 1, frame 1 where there is already a symbol, now there are 2.

fl.getDocumentDOM().library.addItemToDocument({x:0, y:0}, 'Symbol 2');

var eles = seqLayers[0].frames[0].elements
var element = eles[1]

element.selected = true

// Delete this new element, now there's 1 again.

dom.deleteSelection()

// Now you can access the original element

element = eles[0]
element.selected = true

fl.getDocumentDOM().swapElement('Symbol 1');
	

[kilopop2000]

Or also - you can also move the element which allows it to then be swapped. So something is wrong with the swap function.

// Select the layer and frames
seqTL.setSelectedLayers(0)
seqTL.currentLayer = 0

var eles = seqLayers[0].frames[0].elements
var element = eles[0]

element.selected = true

var origX = element.x
element.x = 0
element.x = origX
fl.getDocumentDOM().swapElement('Symbol 1');

[kilopop2000]

On further investigation, we didn't manage to set the selected property of an element that is not in the current timeline - our tests were being run inside the 'main' symbol. So disregard these results.