added a releaselock() before window.unload

javascript/src/QfqForm.js

@@ -152,6 +152,10 @@ var QfqNS = QfqNS || {};
         this.form.on('form.validation.failed', this.validationError);
         this.form.on('form.validation.success', this.validationSuccess);
 
+        window.onbeforeunload = function (e) {
+            that.releaseLock();
+        };
+
         $(".radio-inline").append($("<span>", { class: "checkmark", aria: "hidden"}));
         $(".checkbox-inline").append($("<span>", { class: "checkmark", aria: "hidden"}));
         $(".radio").append($("<span>", { class: "checkmark", aria: "hidden"}));