adding lessThan directive, modified greaterThan directive, etc

src/kibana/directives/greater_than.js

@@ -5,13 +5,13 @@ define(function (require) {
     return {
       require: 'ngModel',
       link: function ($scope, $el, $attr, ngModel) {
-        var val = $attr.greaterThan || 0;
         ngModel.$parsers.push(validator);
         ngModel.$formatters.push(validator);
 
         function validator(value) {
+          var val = +$attr.greaterThan || 0;
           var valid = false;
-          if (!isNaN(value)) valid = value > val;
+          if (!isNaN(value)) valid = +value > val;
           ngModel.$setValidity('greaterThan', valid);
           return value;
         }

src/kibana/directives/less_than.js

@@ -0,0 +1,21 @@
+define(function (require) {
+  require('modules')
+    .get('kibana')
+    .directive('lessThan', function () {
+      return {
+        require: 'ngModel',
+        link: function ($scope, $el, $attr, ngModel) {
+          ngModel.$parsers.push(validator);
+          ngModel.$formatters.push(validator);
+
+          function validator(value) {
+            var val = +$attr.lessThan || 0;
+            var valid = false;
+            if (!isNaN(value)) valid = +value < val;
+            ngModel.$setValidity('lessThan', valid);
+            return value;
+          }
+        }
+      };
+    });
+});

src/kibana/plugins/vis_types/controls/point_series_options.html

@@ -17,17 +17,20 @@
                class="form-control"
                type="number"
                step="0.1"
-               min="{{vis.params.yAxis.min}}"
+               greater-than="{{vis.params.yAxis.min}}"
                ng-model="vis.params.yAxis.max"
                ng-required="vis.params.setYExtents">
       </label>
+      <div ng-if="vis.params.yAxis.min > vis.params.yAxis.max">
+        <span class="text-danger">Min must not exceed max</span>
+      </div>
       <label>
         y-min
         <input name="yMin"
                class="form-control"
                type="number"
                step="0.1"
-               max="{{vis.params.yAxis.max}}"
+               less-than="{{vis.params.yAxis.max}}"
                ng-model="vis.params.yAxis.min"
                ng-required="vis.params.setYExtents">
       </label>

src/kibana/plugins/vis_types/controls/point_series_options.js

@@ -2,6 +2,8 @@ define(function (require) {
   var _ = require('lodash');
   var $ = require('jquery');
   var module = require('modules').get('kibana');
+  require('directives/greater_than');
+  require('directives/less_than');
 
   module.directive('pointSeriesOptions', function ($parse, $compile) {
     return {