I have the following set up:
stApp.controller('AdminTableController', ['$rootScope', '$scope', 'gridService',
function ($rootScope, $scope, gridService) {
$scope.$watch('tableData.$pristine', function (newValue) {
$rootScope.broadcast("tableDataUpdated", {
state: page.$pristine
});
});
}])
stApp.controller('AdminGridController', ['$rootScope', '$scope', 'gridService',
function ($rootScope, $scope, gridService) {
$rootScope.on("tableDataUpdated", function (args) {
//args.state would have the state.
alert(args.state);
});
}])
When I run this code I am getting a message:
Object #<Object> has no method 'on'
Note that I tried this with both $rootScope.on and $scope.on
You must have meant $broadcast
and $on
(rather than broadcast
and on
), that is:
$rootScope.$broadcast("tableDataUpdated", { state: page.$pristine });
// ...
$rootScope.$on("tableDataUpdated", function (args) {
// ...
It's worth noting that $broadcast
is used to delegate events to child or sibling scopes, whereas $emit
will bubble events upwards to the scope's parents, hence;
When choosing $broadcast
(and not $emit
), one should either inject the root scope for tying the $on
(as you nicely did ) or call $on
on the receiver's isolated scope, be it a child scope of the dispatcher.
See this post for elaboration on $emit
and $broadcast
.
If the event listener is in a child scope : $scope.$broadcast('MyEvent', args);
If the event listener is in a parent scope : $scope.$emit('MyEvent', args);
You could avoid any confusion by using $broadcast on $rootScope, since $rootScope is the parent of all scopes in an Angular application: $rootScope.$broadcast('MyEvent', args);
Whether you use $emit or $broadcast, the receiving controller listens with $scope.$on('MyEvent', function() {});
$rootScope.on("tableDataUpdated", function (args) {
//args.state would have the state.
alert(args.state);
});
should be
$rootScope.$on("tableDataUpdated", function (args) {
//args.state would have the state.
alert(args.state);
});
$scope.$emit('MyEvent', args);
从第一个控制器,并在第二个控制器接收:
$scope.$on('MyEvent', function() {});
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