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avoid possible exception if selection is undefined

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defensive programming only
This commit is contained in:
Brian Gough 2017-06-15 14:32:00 +01:00
parent b9804823f3
commit 503822deb0
1 changed files with 2 additions and 2 deletions
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4
services/web/public/coffee/ide/pdfng/directives/pdfViewer.coffee
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@ -441,11 +441,11 @@ define [
return true
_hasSelection = () ->
selection = window.getSelection()
selection = window.getSelection?()
# check the selection type in preference to using
# selection.toString() as the latter is "" when the
# selection is hidden (e.g. while viewing logs)
return _isSelectionWithinPDF(selection) and selection.type is 'Range'
return selection? and _isSelectionWithinPDF(selection) and selection.type is 'Range'
_isSelectionWithinPDF = (selection) ->
if selection.rangeCount == 0