Do validation before enabling the Save button.

web/pgadmin/browser/server_groups/servers/templates/servers/servers.js

@@ -194,13 +194,25 @@ function($, _, S, pgAdmin, pgBrowser, alertify) {
             {label: '{{ _('Unknown') }}', value: ''}
           ]
         }],
-        validate: function(attrs, options) {
-          if (!this.isNew() && 'id' in this.changed) {
-            return '{{ _('Id can not be changed!') }}';
+        validate: function() {
+          var err = {},
+              errmsg;
+
+          if (!this.isNew() && 'id' in this.sessAttrs) {
+            var msg = '{{ _('Id can not be changed!') }}';
+            err['id'] = msg;
+            errmsg = msg;
           }
-          if (String(this.name).replace(/^\s+|\s+$/g, '') == '') {
-            return '{{ _('Name can be empty!') }}';
+          if (_.isUndefined(this.get('name')) || String(this.get('name')).replace(/^\s+|\s+$/g, '') == '') {
+            err['name'] = '{{ _('Name can be empty!') }}';
+            errmsg = errmsg || msg;
           }
+          this.errorModel.set(err);
+
+          if (_.size(err)) {
+            return err;
+          }
+
           return null;
         },
         isConnected: function(model) {

web/pgadmin/browser/templates/browser/js/node.js

@@ -580,7 +580,7 @@ function($, _, S, pgAdmin, Menu, Backbone, Alertify, Backform) {
                 btnSave = btnGroup.find('button[type="save"]'),
                 btnReset = btnGroup.find('button[type="reset"]');
 
-            if (m.sessChanged()) {
+            if (m.sessValid() && m.sessChanged()) {
               btnSave.prop('disabled', false);
               btnSave.removeAttr('disabled');
               btnReset.prop('disabled', false);
@@ -978,6 +978,7 @@ function($, _, S, pgAdmin, Menu, Backbone, Alertify, Backform) {
 
         self.trackChanges = true;
         self.sessAttrs = {
+          'valid': true,
           'changed': [],
           'added': [],
           'deleted': []
@@ -1007,6 +1008,26 @@ function($, _, S, pgAdmin, Menu, Backbone, Alertify, Backform) {
             this.sessAttrs['deleted'].length > 0
             );
       },
+      sessValid: function() {
+        _.each(this.sessAttrs['added'], function(o) {
+          if ('sessValid' in o && _.isFunction(o.sessValid) &&
+             (!o.sessValid.apply(o) ||
+              ('validate' in o && _.isFunction(o.validate) &&
+               _.isString(o.validate.apply(o))))) {
+            return false;
+          }
+          return true;
+        });
+        _.each(self.sessAttrs['changed'], function(o) {
+          if ('sessValid' in o && _.isFunction(o.sessValid) &&
+             (!o.sessValid.apply(o) ||
+              ('validate' in o && _.isFunction(o.validate) &&
+               _.isString(o.validate.apply(o))))) {
+            return false;
+          }
+        });
+        return true;
+      },
       toJSON: function(session) {
         var self = this,
             onlyChanged = (typeof(session) != "undefined" &&
@@ -1061,6 +1082,7 @@ function($, _, S, pgAdmin, Menu, Backbone, Alertify, Backform) {
           return self.onChange();
         }
         self.sessAttrs['added'].push(obj);
+
         return self.onChange();
       },
       onModelRemove: function(obj) {
@@ -1239,6 +1261,14 @@ function($, _, S, pgAdmin, Menu, Backbone, Alertify, Backform) {
               return self.get(o).sessChanged();
             }));
       },
+      sessValid: function() {
+        var self = this;
+        if ('validate' in self && _.isFunction(self.validate) &&
+            _.isString(self.validate.apply(self))) {
+          return false;
+        }
+        return true;
+      },
       set: function(key, val, options) {
         var res = Backbone.Model.prototype.set.call(this, key, val, options);
 

web/pgadmin/static/js/backform.pgadmin.js

@@ -128,6 +128,32 @@
     '</div>'
   ].join("\n"));
 
+  Backform.Control.prototype.clearInvalid = function() {
+    this.$el.removeClass(Backform.errorClassName);
+    this.$el.find(".pgadmin-control-error-message").remove();
+    return this;
+  };
+  Backform.Control.prototype.updateInvalid = function() {
+    var self = this;
+    var errorModel = this.model.errorModel;
+    if (!(errorModel instanceof Backbone.Model)) return this;
+
+    this.clearInvalid();
+
+    this.$el.find(':input').not('button').each(function(ix, el) {
+      var attrArr = $(el).attr('name').split('.'),
+          name = attrArr.shift(),
+          path = attrArr.join('.'),
+          error = self.keyPathAccessor(errorModel.toJSON(), $(el).attr('name'));
+
+      if (_.isEmpty(error)) return;
+
+      self.$el.addClass(Backform.errorClassName).append(
+        $("<div></div>").addClass('pgadmin-control-error-message col-xs-12 help-block').text(error)
+      );
+    });
+  };
+
   var ReadonlyOptionControl = Backform.ReadonlyOptionControl = Backform.SelectControl.extend({
     template: _.template([
       '<label class="<%=Backform.controlLabelClassName%>"><%=label%></label>',