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Thread: ext-621: Primary xtype for Ext.form.field.Combobox has been changed to 'combo'

    You found a bug! We've classified it as EXTJS-23580 . We encourage you to continue the discussion and to find an acceptable workaround while we work on a permanent fix.
  1. #1

    Default ext-621: Primary xtype for Ext.form.field.Combobox has been changed to 'combo'


    In ExtJs 6.2.1, It looks like the primary xtype for the Ext.form.field.Combobox has been changed from the previous 'combobox' to 'combo'.

    We are migrating from ExtJs 4.2.1 to ExtJs 6.2.1, and some of our code that was relying on some xtype comparisons started failing.

    We are currently using isXType() as an alternative, to check whether a control is a combobox or not. (it appears to support backward compatibility)

    But, we would like to know why such a breaking change was made and if there are any other controls that suffer this problem too.

    Ext.application({    name : 'Fiddle',
        launch : function() {
            alert(Ext.create('Ext.form.field.ComboBox').xtype) // this will show "combo" instead of previous "combobox"
    Note: this wont replicate in sencha fiddle because it uses debug versions of ext-all.js, which still uses 'combobox' as primary xtype.

    Thank you,

  2. #2
    Sencha Premium User mitchellsimoens's Avatar
    Join Date
    Mar 2007
    Gainesville, FL


    Created a fiddle that uses ext-all.js:

    I can reproduce what you are reporting and will open a bug for it. Instead of xtype you could use the isXType method and optionally make it check shallow instead of checking it's superclasses.
    Mitchell Simoens @LikelyMitch

    Check out my GitHub:

    Posts are my own, not any current, past or future employer's.

  3. #3


    yup, thank you..

    do you think there could be other controls that suffer this problem too?

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