1 files changed, 50 insertions, 0 deletions
diff --git a/js/params.js b/js/params.js
new file mode 100644
index 0000000..ac552a5
--- /dev/null
+++ b/js/params.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This Source Code Form is "Incompatible With Secondary Licenses", as
+ * defined by the Mozilla Public License, v. 2.0.
+ */
+
+function sortedList_moveItem(paramName, direction, separator) {
+    var select = document.getElementById('select_' + paramName);
+    var inputField = document.getElementById('input_' + paramName);
+    var currentIndex = select.selectedIndex;
+    var newIndex = currentIndex + direction;
+    var optionCurrentIndex;
+    var optionNewIndex;
+
+    /* Return if no selection */
+    if (currentIndex < 0) return;
+    /* Return if trying to move upward out of list */
+    if (newIndex < 0) return;
+    /* Return if trying to move downward out of list */
+    if (newIndex >= select.length) return;
+
+    /* Move selection */
+    optionNewIndex = select.options[newIndex];
+    optionCurrentIndex = select.options[currentIndex];
+    /* Because some browsers don't accept the same option object twice in a
+     * selection list, we need to put a blank option here first */
+    select.options[newIndex] = new Option();
+    select.options[currentIndex] = optionNewIndex;
+    select.options[newIndex] = optionCurrentIndex;
+    select.selectedIndex = newIndex;
+    populateInputField(select, inputField, separator);
+}
+
+function populateInputField(select, inputField, separator) {
+    var i;
+    var stringRepresentation = '';
+
+    for (i = 0; i < select.length; i++) {
+        if (select.options[i].value == separator) {
+            break;
+        }
+        if (stringRepresentation != '') {
+            stringRepresentation += ',';
+        }
+        stringRepresentation += select.options[i].value;
+    }
+    inputField.value = stringRepresentation;
+}