From b4c57eb52706fd61f3167dc05eccae1fd7c30513 Mon Sep 17 00:00:00 2001
From: Byron Jones <bjones@mozilla.com>
Date: Wed, 26 Sep 2012 01:01:12 +0800
Subject: Bug 437212: Make page refreshing under Firefox update fields
 r=LpSolit, a=LpSolit

---
 js/field.js | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 js/util.js  | 21 +++++++++++++++++++++
 2 files changed, 69 insertions(+)

(limited to 'js')

diff --git a/js/field.js b/js/field.js
index caf13217b..7d47169d4 100644
--- a/js/field.js
+++ b/js/field.js
@@ -927,3 +927,51 @@ function userDisabledTextOnChange(disabledtext) {
         disable_mail.checked = true;
     }
 }
+
+/**
+ * Force the browser to honour the selected option when a page is refreshed,
+ * but only if the user hasn't explicitly selected a different option.
+ */
+function initDirtyFieldTracking() {
+    // old IE versions don't provide the information we need to make this fix work
+    // however they aren't affected by this issue, so it's ok to ignore them
+    if (YAHOO.env.ua.ie > 0 && YAHOO.env.ua.ie <= 8) return;
+    var selects = document.getElementById('changeform').getElementsByTagName('select');
+    for (var i = 0, l = selects.length; i < l; i++) {
+        var el = selects[i];
+        var el_dirty = document.getElementById(el.name + '_dirty');
+        if (!el_dirty) continue;
+        if (!el_dirty.value) {
+            var preSelected = bz_preselectedOptions(el);
+            if (!el.multiple) {
+                preSelected.selected = true;
+            } else {
+                el.selectedIndex = -1;
+                for (var j = 0, m = preSelected.length; j < m; j++) {
+                    preSelected[j].selected = true;
+                }
+            }
+        }
+        YAHOO.util.Event.on(el, "change", function(e) {
+            var el = e.target || e.srcElement;
+            var preSelected = bz_preselectedOptions(el);
+            var currentSelected = bz_selectedOptions(el);
+            var isDirty = false;
+            if (!el.multiple) {
+                isDirty = preSelected.index != currentSelected.index;
+            } else {
+                if (preSelected.length != currentSelected.length) {
+                    isDirty = true;
+                } else {
+                    for (var i = 0, l = preSelected.length; i < l; i++) {
+                        if (currentSelected[i].index != preSelected[i].index) {
+                            isDirty = true;
+                            break;
+                        }
+                    }
+                }
+            }
+            document.getElementById(el.name + '_dirty').value = isDirty ? '1' : '';
+        });
+    }
+}
diff --git a/js/util.js b/js/util.js
index 7ecc2a3d8..6d1f88938 100644
--- a/js/util.js
+++ b/js/util.js
@@ -229,6 +229,27 @@ function bz_selectedOptions(aSelect) {
     return selected;
 }
 
+/**
+ * Returns all Option elements that have the "selected" attribute, as an array.
+ * Returns an empty array if nothing is selected.
+ *
+ * @param aSelect The select you want the pre-selected values of.
+ */
+function bz_preselectedOptions(aSelect) {
+    var options = aSelect.options;
+    var selected = new Array();
+    for (var i = 0, l = options.length; i < l; i++) {
+        var attributes = options[i].attributes;
+        for (var j = 0, m = attributes.length; j < m; j++) {
+            if (attributes[j].name == 'selected') {
+                if (!aSelect.multiple) return options[i];
+                selected.push(options[i]);
+            }
+        }
+    }
+    return selected;
+}
+
 /**
  * Tells you where (what index) in a <select> a particular option is.
  * Returns -1 if the value is not in the <select>
-- 
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