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Published Jul. 2, 2025

Embedded Language Selector with "Select Box" template throws "Uncaught TypeError: Cannot read property 'attr' of null" when switching language

Written By

Alfonso Crisci

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Issue

  • When embedding the Language Selector in the theme or a layout template and setting it to have "Select Box" template in the portlet's Configuration settings, the below error will be thrown in the browser's console upon switching the language: 
    combo?browserId=othe…get-position.js:173 Uncaught TypeError: Cannot read property 'attr' of null
        at Object._defaultSubmitFormFn (combo?browserId=othe…get-position.js:173)
        at Y.CustomEvent.CEProto.fireComplex (combo?browserId=othe…mousewheel.js:539)
        at Y.CustomEvent._fire (combo?browserId=othe…t-mousewheel.js:512)
        at Object.fire (combo?browserId=othe…t-mousewheel.js:530)
        at combo?browserId=othe…get-position.js:227
        at Object._proxy (combo?browserId=othe…get-position.js:141)
        at combo?browserId=othe…ui-base-core.js:152
        at args.<computed> (combo?browserId=othe…t-mousewheel.js:373)
        at YUI._notify (combo?browserId=othe…nt-mousewheel.js:71)
        at combo?browserId=othe…nt-mousewheel.js:70
    eventually, the language won't switch as expected.

Environment

  • Liferay DXP 7.0+

Resolution

  • Make sure the portlet's instanceId has not a static value in the embedding code.

    A code like this will cause the issue:
    <@liferay_portlet["runtime"]
      instanceId="01"
      portletProviderAction=portletProviderAction.VIEW
      portletProviderClassName="com.liferay.portal.kernel.servlet.taglib.ui.LanguageEntry"
    />
    The issue will no longer occur when giving the instanceId a dynamic value, for example:
    <@liferay_portlet["runtime"]
      instanceId="FOOTER${plid}"
      portletProviderAction=portletProviderAction.VIEW
      portletProviderClassName="com.liferay.portal.kernel.servlet.taglib.ui.LanguageEntry"
    />

Additional Information

 

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