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) {
$scope.userType = 'guest';
}
</script>
</head>
<body>
<form name="myForm" ng-controller="Ctrl">
userType: <input name="userTypeInput" ng-model="userType">
<tt>userType = {{userType}}</tt><br>
<tt>myForm = {{myForm}}</tt><br>
<tt>myForm.userTypeInput = {{myForm.userTypeInput}}</tt><br>
</form>
</body>
</html>
The first line updates according to the changes made in the model, but the last couple of lines always remain the same:
myForm = {"userTypeInput":{}}
myForm.userTypeInput = {}
while I expected them to change according to the value I type in userTypeInput.
The name attribute of the element does nothing in terms of how angular treats a DOM element, the ng-model, ng-app, and ng-controller are the only parts in your HTML (along with the data bindings) that Angular will recognize. Since angular doesn't look at the name attribute when resolving variables for binding it doesn't update the other two, Angular is only looking at variables on the scope.
Related
I have a simple form.
<html lang="en" ng-app="MyApp">
<head>
</head>
<body ng-controller="AppCtrl">
<form name="myForm" id="myForm">
<input type="text" ng-model="field" name="myField" />
<div ng-show="myForm.myField.$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) {
$rootScope.page = {
title: 'default title'
};
});
Then change the expressions to access the title attribute of this object:
<title>{{ page.title }}</title>
and in the controller view:
<input ng-model="page.title" />
make all your data bindings inside ng-controllers scope, that is {{title}} should inside or you move to your ng-controller to html tag, :)
Input field contains JSON data set from some other script.I have to access in controller.How can I access it in controller.Code I am using something like this-
<html>
<head>
<title>Angular JS Controller</title>
</head>
<body>
<h2>AngularJS Sample Application</h2>
<div ng-app="" ng-controller="studentController">
Enter first name: <input class="get" type="text" ng-model="student">
</div>
<script>
function studentController($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";
});
I'm teaching myself Angular and I've looked over a number of examples that show how to bind a model to an HTML input so that they always contain the same text.
I understand that Angular also provides the $location service which works with the URL.
I have an application that I'm thinking of partially rewriting in Angular as a learning example.
In my example, I have an HTML input that I keep synced up with a model using jQuery and also synced up with a hash URL.
Is there a simple way of accomplishing this with AngularJS?
Consider the example application bellow:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script src="Scripts/angular.js"></script>
<script>
var myApp = angular.module('myApp', []);
function FirstController($scope, $location) {
var data = {
bar: 'hello world'
};
$scope.data = data
}
</script>
</head>
<body>
<div ng-app="myApp">
<div ng-controller="FirstController">
<input ng-model="data.bar" />
<h2>{{ data.bar }}</h2>
</div>
</div>
</body>
</html>
This is a simple example showing how the model can be kept synced with a textbox. I was wondering if it's possible to keep it synced with a hash URL, as well, so that we would have http://www.example.com#bar=What_The_User_Typed
What you probably need is the $routeProvider
https://docs.angularjs.org/tutorial/step_07
How come subobjects do not get the two-way binding:
<!DOCTYPE html>
<html ng-app="app">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.1/angular.min.js"></script>
<script>
angular.module('app', []).controller('testCtrl', function($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.