How come subobjects do not get the two-way binding:
<!DOCTYPE html>
<html ng-app="app">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.1/angular.min.js"></script>
<script>
angular.module('app', []).controller('testCtrl', function($scope) {
$scope.doc = { "foo": "bar", "baz": { "zab": "rab" }}
})
</script>
</head>
<body>
<form ng-controller="testCtrl">
<label><span>Foo</span><input ng-model="doc.foo"></label>
<fieldset>
<legend>Baz</legend>
<label ng-repeat="(key,val) in doc.baz">
<span>{{key}}</span><input ng-model="val">
</label>
</fieldset>
<pre><code>{{doc | json}}</code></pre>
</form>
</body>
</html>
If I edit the foo, I can see it update. But if I edit the zab, I cannot see any changes.
Is there some way to make this work, and if not, another data construct (like baz being an array of objects) which could be made to work?
Change ng-model to this:
<span>{{key}}</span><input ng-model="doc.baz[key]">
The reason that val isn't updating your outer scope (testCtrl's scope) is that ng-repeat creates a new scope for each iteration - so you are only binding the input box to the local (iteration's) scope copy of val, not the parent's scope part of your larger object.
Related
I have a simple form.
<html lang="en" ng-app="MyApp">
<head>
</head>
<body ng-controller="AppCtrl">
<form name="myForm" id="myForm">
<input type="text" ng-model="field" name="myField" />
<div ng-show="myForm.myField.$error" style="color: red">
{{myForm.myField.$error}}
</div>
</form>
<script src="bower_components/angular/angular.js"></script>
<script src="controller.js"></script>
</body>
</html>
And i have angular controller
angular.module('MyApp',[])
.controller('AppCtrl', function($scope) {
$scope.myForm.myField.$error = "just to see it work";
});
Why do I get error '$scope.myForm is undefined'?
You have model, module and controller a little confused. My solutions uses Angular 1.2, although you will soon need to move to Angular 2.
Here is my reworking of your example:
<html lang="en" ng-app="MyApp">
<head>
</head>
<body ng-controller="AppCtrl as ctrl">
<form name="myForm" id="myForm">
<input type="text" ng-model="ctrl.myField" name="myField" />
<div style="color: red">
{{ctrl.myField}}
</div>
</form>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.19/angular.min.js">
</script>
<script src="controller.js"></script>
</body>
</html>
And in the controller.js:
angular.module('MyApp',[])
.controller('AppCtrl', [function() {
this.myField = "just to see it work";
}]);
In the above, I have put "myField" in the scope of the controller "AppCtrl". I have put the whole page under the control of the module 'MyApp'. You can either inject the model with "ng-bind" or use the curly bracket notation in the body of the div to bind to the "myField" model of "ctrl". I have used the latter but be aware this binding will be established after the page has been parsed.
If you load this all now, you should see "just see it work" in red under the text field, and also inside the text field. When you edit the text box, the red text will change in sync. Once you have that working, you will never want to stop learning more about Angular!
I should add that this model has a single attribute. To generalise this you will need to create a model with several properties (one for each input element), so that a JSON object is returned when the form is submitted.
You can't have dots in your variable name.
Try myFormMyFieldError instead of myForm.myField.$error.
Additional: Rather than using the attribute style, use a CSS file.
I got an index.html page with the following code
<html>
<head>
<title>{{title}}</title>
</head>
</html>
And i got a view.html
<div ng-controller="changeCtrl">
<input type="text" ng-model="page-title">
</div>
The routing works perfectly,
Now how can i bind the page-title model to the {{title}} while i type?
Thanks
To avoid using $rootScope or moving ng-app, use a service to handle setting the page title. In the snippet below I've given an example of using a service.
angular.module('app', [])
.service('PageService', function($window) {
return {
setTitle: function (newTitle) { $window.document.title = newTitle; }
};
})
.controller('ChangeCtrl', function(PageService) {
this.setPageTitle = PageService.setTitle;
});
<html>
<head>
<title>My Awesome App</title>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
</head>
<body ng-app="app">
<div ng-controller="ChangeCtrl as ctrl">
<label>{{ctrl.title}}</label>
<input type="text" ng-model="ctrl.title" ng-change="ctrl.setPageTitle(ctrl.title)">
</div>
</body>
</html>
First of all, since the expression is right under the html root element, the angular application must "cover" this element. So ng-app should be on the html element:
<html ng-app="app">
Second, since the expression is outside of any controller scope, angular looks for the title field in the $rootScope. So, you need your input field, inside a view handled by a controller, to modify the value of a $rootScope attribute.
That can't be done:
<input ng-model="title" />
will set the field titleon the controller scope. What can be done, though, is to access an object, by scope inheritance, defined in the root scope, and modify one of its attributes. So, firstmake sure such an object exists in the root scope:
angular.module('app').run(function($rootScope) {
$rootScope.page = {
title: 'default title'
};
});
Then change the expressions to access the title attribute of this object:
<title>{{ page.title }}</title>
and in the controller view:
<input ng-model="page.title" />
make all your data bindings inside ng-controllers scope, that is {{title}} should inside or you move to your ng-controller to html tag, :)
When I edit a value through an input field that is bound (perhaps bound isn't the right term) to a parent controller's scope, it seems to re-bind to the child controller's scope. This eliminates my ability to affect the value with functions built into the parent scope (clicking the button in the example) which works BEFORE I edit the input field manually.
E.g:
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Example - example-example85-production</title>
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.4.0-beta.1/angular.min.js"></script>
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.4.0-beta.1/angular-animate.js"></script>
<script type="text/javascript">
angular.element(document.getElementsByTagName('head')).append(angular.element('<base href="' + window.location.pathname + '" />'));
</script>
</head>
<body ng-app="inputExample">
<script>
angular.module('inputExample', [])
.controller('ExampleController', ['$scope', function($scope) {
$scope.val = '1';
$scope.$watch('val',function(){
alert($scope.val);
});
$scope.set_val = function(){
$scope.val = 2;
}
}])
.controller('childController',['$scope', function($scope){}]);
</script>
<form name="testForm" ng-controller="ExampleController">
<div ng-controller="childController">
<input ng-model="val" />
<input type="button" ng-click="set_val()" value="change value"/>
</div>
</form>
</body>
</html>
http://plnkr.co/edit/cMz9dIMgnyImxQ0va7Wn?p=preview
childController creates a new scope that prototypically inherits from the ExampleController scope. Angular's use of prototypical inheritance and scope can be confusing, especially if you assume that prototypical inheritance behaves as inheritance does in other languages (C#, Java, etc).
If ExampleController.scope.val = 2, then the input will be initialized with the value 2, however, when the input modifies the value, it does so by setting
childController.val = 2.
Now both ExampleController.scope and childController.scope have a property val with a value of 2, but they are completely separate and not bound together.
This is why angular recommends using "dot notation" for models.
However, your childController looks to be unnecessary in your example and removing it will fix your problem. If you can't remove it (because your actual implementation is doing something with it, then change your models to "dot" notation.
<body ng-app="inputExample">
<script>
angular.module('inputExample', [])
.controller('ExampleController', ['$scope', function($scope) {
$scope.data = {};
$scope.data.val = '1';
$scope.$watch('data.val',function(){
alert($scope.data.val);
});
$scope.set_val = function(){
$scope.data.val = 2;
}
}])
.controller('childController',['$scope', function($scope){}]);
</script>
<form name="testForm" ng-controller="ExampleController">
<div ng-controller="childController">
<input ng-model="data.val" />
<input type="button" ng-click="set_val()" value="change value"/>
</div>
</form>
</body>
</html>
Here is the working Plunk.
Input field contains JSON data set from some other script.I have to access in controller.How can I access it in controller.Code I am using something like this-
<html>
<head>
<title>Angular JS Controller</title>
</head>
<body>
<h2>AngularJS Sample Application</h2>
<div ng-app="" ng-controller="studentController">
Enter first name: <input class="get" type="text" ng-model="student">
</div>
<script>
function studentController($scope) {
console.log($scope.student);
}
</script>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js"></script>
</body>
</html>
With Angular, the controller is who tells the View what the default value should be (not the other way around). The View would reflect that, and could update it (with ng-model), but it is initially set by the controller.
So, the controller knows because the controller sets it up:
.controller("studentController", function($scope){
$scope.student = "default name";
});
In the following Angular application, why don't {{myForm}} and {{myForm.userTypeInput}} update when the userTypeInput model is changed.
<!doctype html>
<html ng-app>
<head>
<script src="http://code.angularjs.org/1.0.6/angular.min.js"></script>
<script>
function Ctrl($scope) {
$scope.userType = 'guest';
}
</script>
</head>
<body>
<form name="myForm" ng-controller="Ctrl">
userType: <input name="userTypeInput" ng-model="userType">
<tt>userType = {{userType}}</tt><br>
<tt>myForm = {{myForm}}</tt><br>
<tt>myForm.userTypeInput = {{myForm.userTypeInput}}</tt><br>
</form>
</body>
</html>
The first line updates according to the changes made in the model, but the last couple of lines always remain the same:
myForm = {"userTypeInput":{}}
myForm.userTypeInput = {}
while I expected them to change according to the value I type in userTypeInput.
The name attribute of the element does nothing in terms of how angular treats a DOM element, the ng-model, ng-app, and ng-controller are the only parts in your HTML (along with the data bindings) that Angular will recognize. Since angular doesn't look at the name attribute when resolving variables for binding it doesn't update the other two, Angular is only looking at variables on the scope.