https://community.esri.com/t5/arcgis-experience-builder-questions/using-custom-messages-to-communicate-between/m-p/1683465#M22426 <P>Hello All,</P><P>Is it possible to use a custom message to communicate between widgets or are we limited to those in the <A href="https://developers.arcgis.com/experience-builder/api-reference/jimu-core/MessageType/" target="_self">MessageType</A> enumeration?</P><P>I'd like to use the same mechanism that I use with predefined messages, e.g.&nbsp;<SPAN>DATA_SOURCE_FILTER_CHANGE, but for my own events and don't see a way to extend the enum or define my own message.</SPAN></P><P><SPAN>Thanks!</SPAN></P><P><SPAN>--john</SPAN></P><P>&nbsp;</P><P>&nbsp;</P> Tue, 10 Feb 2026 18:00:38 GMT john_cartwright_noaa 2026-02-10T18:00:38Z https://community.esri.com/t5/arcgis-experience-builder-questions/using-custom-messages-to-communicate-between/m-p/1683465#M22426 <P>Hello All,</P><P>Is it possible to use a custom message to communicate between widgets or are we limited to those in the <A href="https://developers.arcgis.com/experience-builder/api-reference/jimu-core/MessageType/" target="_self">MessageType</A> enumeration?</P><P>I'd like to use the same mechanism that I use with predefined messages, e.g.&nbsp;<SPAN>DATA_SOURCE_FILTER_CHANGE, but for my own events and don't see a way to extend the enum or define my own message.</SPAN></P><P><SPAN>Thanks!</SPAN></P><P><SPAN>--john</SPAN></P><P>&nbsp;</P><P>&nbsp;</P> Tue, 10 Feb 2026 18:00:38 GMT https://community.esri.com/t5/arcgis-experience-builder-questions/using-custom-messages-to-communicate-between/m-p/1683465#M22426 john_cartwright_noaa 2026-02-10T18:00:38Z