I had the same requirement,I wanted to display the contents of the file, once the file has been selected. I found the code on https://github.com/apache/openmeetings/blob/4a5e859f886253086e51a2ac26bbc501d621e590/openmeetings-web/src/main/java/org/apache/openmeetings/web/common/UploadableImagePanel.java <https://github.com/apache/openmeetings/blob/4a5e859f886253086e51a2ac26bbc501d621e590/openmeetings-web/src/main/java/org/apache/openmeetings/web/common/UploadableImagePanel.java> , line 77, new AjaxFormSubmitBehavior(form, "change") to be extremely helpful and just what I was looking for.
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