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Thread: TypeError: 'null' is not an object

    Success! Looks like we've fixed this one. According to our records the fix was applied for DSGNR-674 in a recent build.
  1. #1
    Touch Premium Member
    Join Date
    Aug 2011

    Exclamation TypeError: 'null' is not an object

    While using Ext Designer 1.2.0 I am getting

    TypeError: 'null' is not an object
    error at which time I can exit or restart...
    The error occurs on simple Viewport boreder layout with all 4 regions having simple Panels...

    After adding center panel and adding header (north) panel, I tried adding menu (west)...
    At that point changing region of menu also changes region of the header to same region (noth)!?!...
    Seconds later...error...


  2. #2
    Sencha User aconran's Avatar
    Join Date
    Mar 2007


    Unable to reproduce, could you please provide exact steps to reproduce?
    Aaron Conran

  3. #3
    Touch Premium Member
    Join Date
    Aug 2011



    Here are the steps:
    1. start new project using ExtJS v4
    2. drag in viewport (userClassName = 'Viewport', layout = 'border')
    3. drag in container (region = 'north', layout = 'fit')
    4. drag in container (region = 'south', layout = 'fit')
    5. drag in panel (region = 'west', layout = 'accordion', title = 'Navigation')
    6. drag in panel (region = 'east', title = 'Side Bar')
    6. drag in tabpanel (region = 'center')
    7. add 3 treepanels into Navigation panel (accordian)
    8. try to resize right column of the Designer (where Components anc Component Config are)
    --> Exception occured (see screenshot 1)

    Other weridness
    - when I resize both designer columns the center area does not "repaint" and project looks like missing pieces. (see screenshot 2)
    If I click preview, and then close out preview everything is back to normal
    - if I keep resizing columns, doing preview, looking at the cooe I eventually get
    "TypeError: 'null' is not an object" (see screenshot 3)


  4. #4
    Sencha User
    Join Date
    Aug 2011

    Default reproduce this error

    add a Panel or From Panel, then add a Tab Panel or Tree Panel or other object on the Panel, right click on the Tab Panel or Tree Panel or the other object, error occurred, if not, repeat the right click op...

    I use version 1.2.0 & choose Ext JS 4.0.x under WindowsXp sp3...

  5. #5


    The issue is reproducible. Thanks for the repro steps..
    Filed as a bug in our bug tracking DB. We will track this issue accordingly..

    Sencha SQA

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