Keep open when validation has failed

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The PrimeFaces ajax response puts an args object in the scope which has a validationFailed property. You could just make use of it.

oncomplete="if (args && !args.validationFailed) PF('editDialog').hide()"

(the args precheck is necessary to not cause a JS error when an exception is thrown during request)

You could refactor it to a reusable JS function as follows.

oncomplete="hideDialogOnSuccess(args, 'editDialog')"

function hideDialogOnSuccess(args, dialogWidgetVar) {
    if (args && !args.validationFailed) {
        PF(dialogWidgetVar).hide();
    }
}

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