puiautocomplete panel z-index should be relative to source element
When an autocomplete element is in a pop-up dialog, the autocomplete panel will show below the dialog.
Fix thoughts: code could sum z-index of parent tree (costly), allow a custom z-index option for panel (might be good option to have regardless), or perhaps expose a before/after show event.
Work around with completeSource function:
After response.call() invocation, use this.panel.css("z-index", $("#myDialog").css("z-index") + 1);
Are you using primeelement or primeui autocomplete because both inside the dialog is working fine for me can you post me some example or fiddle please
Here is an example: http://jsfiddle.net/ritchiecarroll/n2732cf0/
Here is another z-index issue without a dialog: http://jsfiddle.net/ritchiecarroll/r0494mkh/