Implement a simple form linked dropdown method that allows adding extra attribut…

…es to the input field. refs #1555

@@ -136,7 +136,7 @@ function validate_creditcard($cc_num, $type) {
 
 if ( ! function_exists('form_dropdown'))
 {
-	function form_dropdown($name = '', $options = array(), $selected = array(), $extra = '')
+	function form_dropdown($name = '', $options = array(), $selected = array(), $extra = '', $blankFirstOption = true)
 	{
 		if ( ! is_array($selected))
 		{
@@ -157,7 +157,10 @@ if ( ! function_exists('form_dropdown'))
 
 		$multiple = (count($selected) > 1 && strpos($extra, 'multiple') === FALSE) ? ' multiple="multiple"' : '';
 
-		$form = '<select name="'.$name.'"'.$extra.$multiple.">\n<option value=''>Select...</option>";
+		$form = '<select name="'.$name.'"'.$extra.$multiple.">\n";
+        if ($blankFirstOption) {
+            $form .= '<option value="">Select...</option>';
+        }
 
 		foreach ($options as $key => $val)
 		{
@@ -279,6 +282,103 @@ function form_linked_dropdown($name = '', $parent = '', $options = array(), $par
     return $form;
 }
 
+if (!function_exists('formLinkedDropdownWithExtra')) {
+    function formLinkedDropdownWithExtra($name = '', $parent = '', $options = array(), $parent_selected = '', $selected = '', $extra = '', $provide_js = true, $blankFirstOption = true, $inputExtra = '')
+    {
+        if ($extra != '') {
+            $extra = ' '.$extra;
+        }
+        if ($inputExtra != '') {
+            $inputExtra = ' '.str_ireplace('"', '\"', $inputExtra);
+        }
+
+        $form = '<select name="'.$name.'" id="'.$name.'"'.$extra.">\n";
+
+        if (isset($options[$parent_selected])) {
+            foreach ($options[$parent_selected] as $key => $val) {
+                $sel = ($selected != $key) ? '' : ' selected="selected"';
+
+                $form .= '<option value="'.$key.'"'.$sel.'>'.$val."</option>\n";
+            }
+        }
+
+        if ($provide_js) {
+            $form .= '</select>
+        <script>
+        function update_'.$name.'(value) {
+            if (value == "") {
+                return;
+            }
+
+            jQuery("#'.$name.'_custom").attr("disabled", "disabled").hide();
+            jQuery("#'.$name.'").show();
+
+            var options = new Array();
+            var select = document.getElementById("'.$name.'");
+            select.disabled = false;
+            while (select.firstChild)
+                select.removeChild(select.firstChild);
+            switch (value.toString()) {';
+            foreach ($options as $k => $v) {
+                $form .= 'case "'.$k.'":
+                    options = new Array(';
+                foreach ($v as $value => $content) {
+                    $form .= '"'.$value.'","'.$content.'",';
+                }
+                $form = substr($form, 0, -1);
+                $form .= ');
+                break;';
+            }
+            $form .= 'default:
+                    select.disabled = true;
+
+                    jQuery("#'.$name.'_custom").removeAttr("disabled").show();
+                    jQuery("#'.$name.'").hide();
+
+                    return;
+            }';
+
+            if ($blankFirstOption) {
+                $form .= '
+                    var option = document.createElement("option");
+                    var val = "";
+                    option.val = val;
+                    option.innerHTML = "Select...";
+                    select.appendChild(option);';
+            }
+
+            $form .= 'for(var i = 0; i < options.length;) {
+                var option = document.createElement("option");
+                var val = options[i++];
+                option.value = val;
+                option.innerHTML = options[i++];
+                if (val == "'.$selected.'") {
+                    option.selected = true;
+                }
+                select.appendChild(option);
+            }
+        }
+
+        var elem = $("<input type=\'text\' name=\''.$name.'\' id=\''.$name.'_custom\' class=\'input-field-css input-large\' value=\''.$selected.'\' '.$inputExtra.'/>").hide();
+        elem.insertAfter(jQuery("#'.$name.'"));
+        update_'.$name.'(document.getElementById("'.$parent.'").value);
+        document.getElementById("'.$parent.'").onchange = function() { update_'.$name.'(this.value); }
+        </script>
+        ';
+        } else {
+            $form = '';
+            if (array_key_exists($parent_selected, $options)) {
+                foreach ($options[$parent_selected] as $name => $option) {
+                    $sel = ($selected == $name) ? ' selected="selected"' : '';
+                    $form .= '<option value="'.$name.'"'.$sel.'>'.$option."</option>\n";
+                }
+            }
+        }
+
+        return $form;
+    }
+}
+
 if ( ! function_exists('url_title'))
 {
 	function url_title($str, $separator = 'dash', $lowercase = FALSE)