From 3ef39cbe8d28ceb0dd7296eff5b0d11d66834bbc Mon Sep 17 00:00:00 2001
From: Adam Bradley <adambradley25@gmail.com>
Date: Tue, 21 Nov 2017 13:00:08 -0600
Subject: [PATCH] fix(radio): set initial radio-group value

---
 .../src/components/radio-group/radio-group.tsx  | 17 +++++++++++++++--
 .../components/radio-group/test/form/index.html |  2 +-
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/packages/core/src/components/radio-group/radio-group.tsx b/packages/core/src/components/radio-group/radio-group.tsx
index 3e36f31714..5ecf276fbb 100644
--- a/packages/core/src/components/radio-group/radio-group.tsx
+++ b/packages/core/src/components/radio-group/radio-group.tsx
@@ -87,9 +87,22 @@ export class RadioGroup implements ComponentDidLoad, RadioGroupInput {
     this.radios.push(radio);
     radio.name = this.name;
 
-    if (radio.checked && !this.value) {
-      // set the initial value from the check radio's value
+    if (this.value !== undefined && radio.value === this.value) {
+      // this radio-group has a value and this
+      // radio equals the correct radio-group value
+      // so let's check this radio
+      radio.checked = true;
+
+    } else if (this.value === undefined && radio.checked) {
+      // this radio-group does not have a value
+      // but this radio is checked, so let's set the
+      // radio-group's value from the checked radio
       this.value = radio.value;
+
+    } else if (radio.checked) {
+      // if it doesn't match one of the above cases, but the
+      // radio is still checked, then we need to uncheck it
+      radio.checked = false;
     }
   }
 
diff --git a/packages/core/src/components/radio-group/test/form/index.html b/packages/core/src/components/radio-group/test/form/index.html
index 9e2cb9a45e..451f486178 100644
--- a/packages/core/src/components/radio-group/test/form/index.html
+++ b/packages/core/src/components/radio-group/test/form/index.html
@@ -21,7 +21,7 @@
 
           <ion-list>
 
-            <ion-radio-group name="tannen" id="group">
+            <ion-radio-group name="tannen" id="group" value="biff">
 
               <ion-list-header>
                 <ion-label>Luckiest Man On Earth</ion-label>