From cd16357fcae106176770ee659df7dc2a5830991e Mon Sep 17 00:00:00 2001
From: John McCabe <john@johnmccabe.net>
Date: Fri, 8 Jul 2016 22:03:41 +0100
Subject: [PATCH] this fixes #57

suspect there's a more graceful way to do this
---
 src/angular-advanced-searchbox.html |  2 +-
 src/angular-advanced-searchbox.js   | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/angular-advanced-searchbox.html b/src/angular-advanced-searchbox.html
index 8210ce2..834f77b 100644
--- a/src/angular-advanced-searchbox.html
+++ b/src/angular-advanced-searchbox.html
@@ -43,7 +43,7 @@
                ng-change="searchQueryChanged(searchQuery)"
                ng-model="searchQuery" />
     </div>
-    <div class="search-parameter-suggestions" ng-show="parameters && focus">
+    <div class="search-parameter-suggestions" ng-show="parameters && focus && canAddParameter()">
         <span class="title">{{parametersLabel}}:</span>
         <span class="search-parameter" ng-repeat="param in parameters | filter:isUnsedParameter | limitTo:parametersDisplayLimit" 
           data-key="{{param.key}}"
diff --git a/src/angular-advanced-searchbox.js b/src/angular-advanced-searchbox.js
index 227c295..5822aeb 100644
--- a/src/angular-advanced-searchbox.js
+++ b/src/angular-advanced-searchbox.js
@@ -150,6 +150,21 @@ angular.module('angular-advanced-searchbox', [])
                         return $filter('filter')($scope.searchParams, function (param) { return param.key === value.key && !param.allowMultiple; }).length === 0;
                     };
 
+                    $scope.canAddParameter = function () {
+                      var availableParameters = $scope.parameters.length;
+                        for (var i = 0; i < $scope.parameters.length; i++) {
+                            if (!$scope.parameters[i].allowMultiple) {
+                                for ( var j = 0; j < $scope.searchParams.length; j++) {
+                                  if ($scope.parameters[i].key === $scope.searchParams[j].key) {
+                                    availableParameters -= 1;
+                                    break;
+                                  }
+                                }
+                            }
+                        }
+                        return availableParameters > 0;
+                    };
+
                     $scope.addSearchParam = function (searchParam, value, enterEditModel) {
                         if (enterEditModel === undefined)
                             enterEditModel = true;