I am using AngularJs 1.2.x and stumble upon the ng-change issue of firing on each change. ng-blur can be used but it fires even though there is no change in the value. So both cannot be used efficiently.

With Angularjs 1.3.x, thing are easier using ng-model-options like below

to invoke change function "onBlur"

html

<input type="text" ng-model="ctrl.a.c" sd-change-on-blur="ctrl.onchange()" /> or

<input type="text" ng-model="ctrl.a.c" sd-change-on-blur="ctrl.onchange(ctrl.a.c)" />

JS

    ng-change="ctrl.onchange()" ng-model-options="{updateOn: 'blur'}" 

And **to delay invocation of change function by 500ms**

    ng-change="ctrl.onchange()" ng-model-options='{ debounce: 500 }'" 

Now coming to back to the question of getting such things with AngularJs 1.2.x

**to invoke change function "onBlur"**

app.directive('sdChangeOnBlur', function() {
  return {
    restrict: 'A',
    scope: {
      sdChangeOnBlur: '&'
    },
    link: function(scope, elm, attrs) {
      if (attrs.type === 'radio' || attrs.type === 'checkbox')
        return;

      var parameters = getParameters(attrs.sdChangeOnBlur);

      var oldValue = null;
      elm.bind('focus', function() {
        scope.$apply(function() {
          oldValue = elm.val();
        });
      })
    
      elm.bind('blur', function() {
        scope.$apply(function() {
          if (elm.val() != oldValue) {
            var params = {};
            if (parameters && parameters.length > 0) {
              for (var n = 0; n < parameters.length; n++) {
                params[parameters[n]] = scope.$parent.$eval(parameters[n]);
              }
            } else {
              params = null;
            }

            if (params == null) {
              scope.sdChangeOnBlur();
            } else {
              scope.sdChangeOnBlur(params)
            }
          }
        });
      });
    }
  };
});

function getParameters(functionStr) {
  var paramStr = functionStr.slice(functionStr.indexOf('(') + 1, functionStr.indexOf(')'));
  var params;
  if (paramStr) {
    params = paramStr.split(",");
  }
  var paramsT = [];
  for (var n = 0; params && n < params.length; n++) {
    paramsT.push(params[n].trim());
  }
  return paramsT;
}

to delay invocation of change function by 500ms

html

<input type="text" ng-model="name" sd-change="onChange(name)" sd-change-delay="300"/>

OR

<input type="text" ng-model="name" sd-change="onChange()" sd-change-delay="300"/>

JS

app.directive('sdChange', ['$timeout',
  function($timeout) {
    return {
      restrict: 'A',
      scope: {
        sdChange: '&',
        sdChangeDelay: '@' //optional
      },
      link: function(scope, elm, attr) {
        if (attr.type === 'radio' || attr.type === 'checkbox') {
          return;
        }

        if (!scope.sdChangeDelay) {
          scope.sdChangeDelay = 500; //defauld delay
        }

        var parameters = getParameters(attr.sdChange);

        var delayTimer;
        elm.bind('keydown keypress', function() {
          if (delayTimer !== null) {
            $timeout.cancel(delayTimer);
          }

          delayTimer = $timeout(function() {
            var params = {};
            if (parameters && parameters.length > 0) {
              for (var n = 0; n < parameters.length; n++) {
                params[parameters[n]] = scope.$parent.$eval(parameters[n]);
              }
            } else {
              params = null;
            }

            if (params == null) {
              scope.sdChange();
            } else {
              scope.sdChange(params)
            }
            delayTimer = null;
          }, scope.sdChangeDelay);

          scope.$on(
            "$destroy",
            function(event) {
              $timeout.cancel(delayTimer);
              console.log("Destroyed");
            }
          );
        });
      }
    };
  }
]);

function getParameters(functionStr) {
  var paramStr = functionStr.slice(functionStr.indexOf('(') + 1, functionStr.indexOf(')'));
  var params;
  if (paramStr) {
    params = paramStr.split(",");
  }
  var paramsT = [];
  for (var n = 0; params && n < params.length; n++) {
    paramsT.push(params[n].trim());
  }
  return paramsT;
}

plnkrs for both approaches are

http://plnkr.co/edit/r5t0KwMtNeOhgnaidKhS?p=preview

http://plnkr.co/edit/9PGbYGCDCtB52G8bJkjx?p=info