Clean up before compiling a form.

Fixes memleaks and old registered inputs on form controller, fixes #200

Author: davidlgj

src/directives/schema-form.js

@@ -61,7 +61,7 @@ angular.module('schemaForm')
         //Since we are dependant on up to three
         //attributes we'll do a common watch
         var lastDigest = {};
-
+        var childScope;
         scope.$watch(function() {
 
           var schema = scope.schema;
@@ -77,8 +77,17 @@ angular.module('schemaForm')
             var merged = schemaForm.merge(schema, form, ignore, scope.options);
             var frag = document.createDocumentFragment();
 
+            // Create a new form and destroy the old one.
+            // Not doing keeps old form elements hanging around after
+            // they have been removed from the DOM
+            // https://github.com/Textalk/angular-schema-form/issues/200
+            if (childScope) {
+              childScope.$destroy();
+            }
+            childScope = scope.$new();
+
             //make the form available to decorators
-            scope.schemaForm  = {form:  merged, schema: schema};
+            childScope.schemaForm  = {form:  merged, schema: schema};
 
             //clean all but pre existing html.
             element.children(':not(.schema-form-ignore)').remove();
@@ -117,7 +126,7 @@ angular.module('schemaForm')
             element[0].appendChild(frag);
 
             //compile only children
-            $compile(element.children())(scope);
+            $compile(element.children())(childScope);
 
             //ok, now that that is done let's set any defaults
             schemaForm.traverseSchema(schema, function(prop, path) {