How to send the json data from FirstCtrl to secondCtrl using angularjs.
Can anyone please help me out regarding this ...
First.js:
angular.module('myApp')
.controller('FirstCtrl', function ($scope) {
//firstCtrl json data
$.getJSON("sample.json", function (json) {
console.log(json);
});
});
Second.js:
angular.module('myApp')
.controller('secondCtrl', function ($scope) {
//get the firstCtrl json data here
});
I would also suggest a service that gets and returns data from and to the controllers.
we create the two controllers and then we create a service with two functions:
1. one to get the json data
2. one to return the json data
Like so:
'use strict';
angular.module('myApp', [])
.controller('FirstCtrl', function( $scope, myService ){
//we create or get the json object
$scope.myjsonObj = {
'animal':'cat',
'feed':'frieskies',
'color':'white',
'sex':'male'
};
//pass the json object to the service
myService.setJson($scope.myjsonObj);
})
.controller('SecondCtrl', function( $scope, myService ){
//call service getJson() function to get the data
$scope.myreturnedData = myService.getJson();
})
.factory('myService', function(){
var myjsonObj = null;//the object to hold our data
return {
getJson:function(){
return myjsonObj;
},
setJson:function(value){
myjsonObj = value;
}
}
});
and the HTML partial would be:
<div ng-app="myApp">
<div ng-controller="FirstCtrl">
{{myjsonObj}}
</div>
<hr>
<div ng-controller="SecondCtrl">
{{myreturnedData.animal}}
{{myreturnedData.feed}}
{{myreturnedData.color}}
{{myreturnedData.sex}}
</div>
Hope helps, good luck.
If the second controller is nested you can use $parent to access the scope of the first controller. You would need to assign the value of json to $scope such as
$scope.json = my_json
Then in the second controller you can say
$scope.json = $scope.$parent.json;
var app = angular.module('myApp', []);
app.controller('Ctrl1', function ($scope, $rootScope) {
$scope.msg = 'World';
$rootScope.name = 'AngularJS';
});
app.controller('Ctrl2', function ($scope, $rootScope) {
$scope.msg = 'Dot Net Tricks';
$scope.myName = $rootScope.name;
});
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<!doctype html>
<html>
<body ng-app="myApp">
<div ng-controller="Ctrl1" style="border:2px solid blue; padding:5px">
Hello {{msg}}!
<br />
Hello {{name}}!
(rootScope)
</div>
<br />
<div ng-controller="Ctrl2" style="border:2px solid green; padding:5px">
Hello {{msg}}!
<br />
Hey {{myName}}!
<br />
Hi {{name}}! (rootScope)
</div>
</body>
</html>
Yo can simply make a new service with two functions one to save the date and one to give them, this service then can be accessed from any where.
In addition, you can assign the data to a $rootScope.someVar for example, and in this way too you can retrieve the data from any where
Just use $rootScope to achieve this.
In your first controller assign $rootScope.json = $scope.json; and It will available on the entire application. So, you can access $rootScope.json wherever you want on that particular app
Related
I am trying to use service in AngularJS and pass data from one controller to another on click of a button.
I tried and can see that service value is updated but I am unable to retrieve in the second controller, however, I can retrieve in the first Controller.
<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>
<body ng-app="myApp">
<div ng-controller="myCtrl">
<p>Search:<input type="text" ng-model="newValue"></p>
<button ng-click="myFunc(newValue)">OK</button>
</div>
<div ng-controller="myCtrl2">
{{receivedVal}}
</div>
<script>
var app= angular.module('myApp', []);
app.controller('myCtrl', function($scope,sharedProperties) {
$scope.stringValue = sharedProperties.getString();
$scope.myFunc = function(newValue) {
sharedProperties.setString(newValue);
$scope.stringValue = sharedProperties.getString();
console.log($scope.stringValue);
//I am getting the value here by calling sharedProperties.getString();
};
});
app.controller('myCtrl2', function($scope,sharedProperties) {
$scope.receivedVal = sharedProperties.getString();
console.log($scope.receivedVal);
//But I am not getting the updated value here by calling sharedProperties.getString();
});
app.service('sharedProperties', function() {
var stringValue = 'firstoccurence';
return {
getString: function() {
return stringValue;
},
setString: function(value) {
stringValue = value;
},
}
});
</script>
</body>
</html>
receivedVal is always coming blank even service is getting updated.
By looking at your HTML code; I can see both the controllers have already been instantiated.
So when you do $scope.receivedVal = sharedProperties.getString(); in controller 2, you are just getting value from service one time only (Note : You are not continuously observing the value from service). And hence in template of controller 2 the default value firstoccurence shall be displayed.
You are actually updating the value on click of OK button, which in turns updates value in service. But there is no way you told angular that now as values has been changed then now controller 2 should get this new value.
To active the scenario that you want , you need to use $broadcast and $on so that you can continuously observe change happening in controller 1.
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>
<body ng-app="myApp">
<div ng-controller="myCtrl">
<p>Search:<input type="text" ng-model="newValue"></p>
<button ng-click="myFunc(newValue)">OK</button>
</div>
<div ng-controller="myCtrl2">
{{receivedVal}}
<button ng-click="thisWillGetValFromService()" >update this scope's value</button>
</div>
<script>
var app= angular.module('myApp', []);
app.controller('myCtrl', function($rootScope,$scope,sharedProperties) {
$scope.stringValue = sharedProperties.getString();
$scope.myFunc = function(newValue) {
sharedProperties.setString(newValue);
$scope.stringValue = sharedProperties.getString();
console.log($scope.stringValue);
//I am getting the value here by calling sharedProperties.getString();
$rootScope.$broadcast('greeting', newValue);
};
});
app.controller('myCtrl2', function($scope,sharedProperties) {
$scope.receivedVal = sharedProperties.getString();
console.log($scope.receivedVal);
//But I am not getting the updated value here by calling sharedProperties.getString();
$scope.$on('greeting', function(ev,val){
$scope.receivedVal = val
})
});
app.service('sharedProperties', function() {
var stringValue = 'firstoccurence';
return {
getString: function() {
return stringValue;
},
setString: function(value) {
stringValue = value;
},
}
});
</script>
</body>
Above snippet shall solve your problem.
Updated :
Consider a scenario where you have routing configuration defined. So by default only controller 1 and its templates loads in HTML. Then you update ur input box and click OK button. This will save data to service.
Then later on consider on click of some link you re redirecting the app to route of your controller 2 so at this point your controller 2 will get instantiated and $scope.receivedVal = sharedProperties.getString(); this will give you updated value.
Its just a matter of when you load your template (controller) In your case you load both the controllers at a time so you need to use broadcast and on. But if your second component going to load sometime later then you can always use service.
Value is updating in the second controller
But it is not reflecting in the :
<div ng-controller="myCtrl2">
{{receivedVal}}
</div>
Because ng-controller creates new scope
you should write one extra method like in this:
https://codepen.io/amar9312/pen/yRJKGj
I am learning Angular using W3Schools.
I just modified an example about "Services"... The following is the code:
<!DOCTYPE html>
<html>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
<p><input type="text" ng-model="num"></p>
<h2>{{num}}</h2>
<h1>{{hex}}</h1>
</div>
<p>A custom service whith a method that converts a given number into a hexadecimal number.</p>
<script>
var app = angular.module('myApp', []);
app.service('hexafy', function() {
this.myFunc = function (x) {
return x.toString(16);
}
});
app.controller('myCtrl', function($scope, hexafy) {
$scope.num = 200;
$scope.hex = hexafy.myFunc($scope.num);
});
</script>
</body>
</html>
When I update the textbox, the "HEX" part is not updating. Why?
Your hexafy.myFunc is called only once when the controller is initialized, hence only the initial value is converted to hex. If you want a function to be called on the value change of a scope variable in runtime, you need filters. AngularJS has a lot of inbuilt filters that are ready to use.
You can also define a custom filter, just like you define services or controllers.
<!DOCTYPE html>
<html>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
<p><input type="text" ng-model="num"></p>
<h2>{{num}}</h2>
<h1>{{num | hexafy}}</h1>
</div>
<p>A custom filter that converts a given number into a hexadecimal number.</p>
<script>
var app = angular.module('myApp', []);
app.filter('hexafy', function() {
return function (x) {
return Number(x).toString(16); // Also convert the string to number before calling toString.
}
});
app.controller('myCtrl', function($scope) {
$scope.num = 200;
//$scope.hex = hexafy.myFunc($scope.num);
});
</script>
</body>
</html>
Further reading: AngularJS Filters
NOTE: A filter is a good idea if you're gonna be using the hexafy functionality at multiple places in/across views. Otherwise, it is just an overkill and the $scope.$watch method will work fine for you, as described in other answers
$scope.hex is not updating because there're no way for it update itself.
The hexafy.myFunc is called only once when the controller is loaded for the first time.
If you want want the $scope.hex property to change with num, you might need a watch on the num property.
$scope.$watch('num', function(newVal, oldVal) {
$scope.hex = hexafy.myFunc($scope.num); /// or newVal
}
The function passed in $scope.$watch will be called everytime the value of $scope.num changes.
for more info see https://docs.angularjs.org/api/ng/type/$rootScope.Scope (the watch section)
Hope it helps.
No need of a service here, you can simple use $watch on the num. See below code snippet, it will update your ui, I have updated your controller code, please check.
app.controller('myCtrl', function($scope, hexafy) {
$scope.num = 200;
$scope.hex = "some default val";
$scope.$watch('num', function(newValue, oldValue) {
$scope.hex = newValue.toString();
});
});
Your Text box is only bind to 'num'. '$scope.hex is not binded to your text box'. So that it is not update when you typing text. You could use '$watch' on 'num'. Read here
app.controller('myCtrl', function($scope, hexafy) {
$scope.num = 200;
$scope.$watch('num', function() {
$scope.hex = hexafy.myFunc(parseInt($scope.num));
});
});
see the code
<div ng-app="myApp" ng-controller="ctrlCarLists as cars">
<button ng-click="cars.showCars()">
Cars
</button>
<button ng-click="alert(cars.data)">
Test
</button>
</div>
var app = angular.module('myApp', []);
app.controller("ctrlCarLists", function () {
this.data = 'hello';
this.showCars = function () {
alert("Ford, Toyata, Mercedes");
};
});
i am new in angular so not being able to understand when people do not like to have $scope in controller. so please tell me or show me few scenario with example when people create controller without scope.
what is the meaning of this ctrlCarLists as cars ?
many people may say by this code ctrlCarLists as cars we are creating instance of controller to access property of controller but when we use $scope then controller instance is created too.
please help me to understand..
thanks
This is known as the 'controller as' pattern. For more info, check this and this link.
You can refer the this to a variable, just see the following code
var app = angular.module('myApp', []);
app.controller("ctrlCarLists", function () {
var self = this;
self.data = 'hello';
self.showCars = function () {
alert("Ford, Toyata, Mercedes");
};
});
and change your html to this
<div ng-app="myApp">
<div ng-controller="ctrlCarLists as cars">
<button ng-click="cars.showCars()">
Cars
</button>
</div>
</div>
'this' will an object in side the controller. you can see the data by write {{cars.data}}
in your example
self.showCars is a function smiler to $scope.showCars ,$scope.showCars smiler to $scope.data a variable can access in the controller.
I bind data of two different scopes to the same common service data. When I update the data through controller 1, the data in controller 2 is not refreshed in template.
Example showing the issue :
<body ng-app="demoShareBindApp">
<div ng-controller="FirstCtrl as first">
Set share data to : <a href ng-click="setShareDataTo('Me')">"Me"</a>
- <a href ng-click="setShareDataTo('Myself')">"Myself"</a>
- <a href ng-click="setShareDataTo('I')">"and I"</a>
</div>
<div ng-controller="SecondCtrl as second">
Text entered : {{sShareData}}
<br>
<br><a href ng-click="revealShareData()">Reveal data</a>
</div>
<script src="bower_components/angular/angular.js"></script>
<script>
angular
.module('demoShareBindApp', [])
.service('myService', function () {
return {
shareData: null
}
})
.controller('FirstCtrl', ['$scope', 'myService', function ($scope, myService) {
$scope.setShareDataTo = function(content) {
myService.shareData = content;
};
}])
.controller('SecondCtrl', ['$scope', 'myService', function ($scope, myService) {
$scope.sShareData = myService.shareData;
$scope.revealShareData = function() {
console.log(myService.shareData);
}
}]);
</script>
</body>
The Text entered : {{sShareData}} is never updated whereas clicking "Reveal data" shows the right share data in console.
I can't find any clue in other SO post on this particular subject. I guess it could be a matter of "$watch/$digest" but I can't figure out what is really going on here.
Any detailed explanation welcome !
You are sharing data through service. When data in changed under first controller, you set this updated data to service but second controller does not know that shared data referenced by service has changed, so we need to notify the second controller that data has changed or we can shared data through events
I created a fiddle, check it
https://jsbin.com/midebu/edit?html,js,output
First approach. Using service
$scope.setShareDataTo = function(content) {
myService.shareData = content;
$rootScope.$broadcast('datacChanged');
};
In second cntroller
$rootScope.$on('dataChanged', function(){
// get updated data
$scope.sShareData = myService.shareData;
})
Other way is that, we do not need to use service , we can simply pass that shared data using events
$scope.setShareDataTo = function(content) {
$rootScope.$broadcast('datacChanged', content);
};
And in Second controller
$rootScope.$on('dataChanged', function(event, data){
// get updated data
$scope.shareData = data;
})
I have a template like this.
<body ng-app="demo" ng-controller="demo">
<div ng-include="/main.html">
</div>
</body>
And the main.html is.
<div ng-app="main" ng-controller="main>
""
</div>
here is the js.
JS-1
var myapp = angular.module('demo', []);
myapp.controller('demo', function($scope,$routeParams, $route,$http) {
$scope.variable="444"
})
JS-2
var mainapp = angular.module('mainapp', []);
myapp.controller('main', function($scope,$routeParams, $route,$http) {
})
Is it possible to access the scope of JS-1 inside JS-2?, if yes how, if no is there any solution to this.Thanks.
It depend what you want to do.
If you want read $scope.variable variable from JS-1, you should see it in JS-2 $scope.
If you want modify $scope.variable form JS-1, you should create method in JS-1:
$scope.changes = function(data){
$scope.variable = data;
}
This method also should be available in JS-2 $scope.
This isn't nice solution but should work.
The best solution is to create service which will provide operations on JS-1 fields.