Wt

Currently the readonly attribute is only correctly applied on first render. Later changes are applied on the hidden textarea, but are not applied to the tinyMCE editor.

Possible solution:

Explicitly update the tinyMCE mode to reflect the readonly state, by adding the following code to the end of WTextEdit::setReadOnly:

if (isRendered()) {
  if (readOnly)
    doJavaScript(jsRef() + ".ed.mode.set('readonly');");
  else
    doJavaScript(jsRef() + ".ed.mode.set('design');");
}

See TinyMCE documentation: https://www.tiny.cloud/docs/tinymce/6/apis/tinymce.editormode/#set

Note that this does not seem to work (when the editor is initially readonly), due to a bad initial readonly configuration setting. Wt uses std::string("1") and cpp17::any() (see WTextEdit::setReadOnly), although the documented values are true and false.

See TinyMCE documentation: https://www.tiny.cloud/docs/tinymce/6/editor-important-options/#starting-the-editor-in-a-read-only-state

Correctly using true and false inside WTextEdit::setReadOnly, resolves this issue:

if (readOnly)
  setConfigurationSetting("readonly", true);
else
  setConfigurationSetting("readonly", false);