From b846bea0fde6b14f63194450e4a77693c3a039a2 Mon Sep 17 00:00:00 2001
From: TJ VanToll <tj.vantoll@gmail.com>
Date: Fri, 27 Sep 2013 13:49:57 -0400
Subject: [PATCH] Spinner: Only format the value when there is one. Fixes #9573
 - Spinner: forces a field validation in Firefox before field loses focus or
 form is submitted (cherry picked from commit
 e6360ab846c6d0248d6013d005d2c178906ca692)

---
 ui/jquery.ui.spinner.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/ui/jquery.ui.spinner.js b/ui/jquery.ui.spinner.js
index 644b652395a..aa284f09587 100644
--- a/ui/jquery.ui.spinner.js
+++ b/ui/jquery.ui.spinner.js
@@ -55,8 +55,12 @@ $.widget( "ui.spinner", {
 		this._setOption( "min", this.options.min );
 		this._setOption( "step", this.options.step );
 
-		// format the value, but don't constrain
-		this._value( this.element.val(), true );
+		// Only format if there is a value, prevents the field from being marked
+		// as invalid in Firefox, see #9573.
+		if ( this.value() !== "" ) {
+			// Format the value, but don't constrain.
+			this._value( this.element.val(), true );
+		}
 
 		this._draw();
 		this._on( this._events );