I am new to Angular JS. Here is my html :
<!DOCTYPE html>
<html>
<head>
<title>My App</title>
<script src = "angular.js"></script>
</head>
<body ng-app="myApp">
<div ng-controller="index">
{{message}}
</div>
<form>
First Name:<br>
<input type="text" ng-model="user.username">{{user.username}}<br>
Last Name:<br>
<input type="password" ng-model="user.password">
</form>
<script src = "app.js"></script>
<script src = "credentials.js"></script>
</body>
</html>
Then I want to initialize some data for username and password :
(function(){
var app=angular.module("myApp",[]);
app.controller("index", ["$scope", function($scope){
$scope.message="Hello, it's me!";
$scope.user={
username: "admin",
password: "admin"
};
}]);
})();
The username and password doesn't get displayed. Why?
You're problem is that you have bound the controller to the div-tag surrounding the {{message}} expression and not the whole block containing the form. If bind your controller to a surrounding element youre code will work as expected.
Here's one way to do this:
<body ng-app="myApp">
<div ng-controller="index">
<div>
{{message}}
</div>
<form>
First Name:<br>
<input type="text" ng-model="user.username">{{user.username}}<br>
Last Name:<br>
<input type="password" ng-model="user.password">
</form>
</div>
</body>
Your controller div is not covering the area where you have user object. controller div must include the code in which you are accessing user object
You can change the code like this
<body ng-app="myApp">
<div ng-controller="index">
{{message}}
<form>
First Name:<br>
<input type="text" ng-model="user.username">{{user.username}}<br>
Last Name:<br>
<input type="password" ng-model="user.password">
</form>
</div>
<script src = "app.js"></script>
<script src = "credentials.js"></script>
</body>
<div ng-app="">
<p>Name: <input type="text" ng-model="name"></p>
<p ng-bind="name"></p>
</div>
as you can see in this example
ng-model directive binds the value of HTML controls (input, select,
textarea) to application data. ng-bind directive binds application
data to the HTML view.
i can see ng-model in your code but there is not ng-bind which actually binds data to your view. probably that is the reason why your code is not displaying username and password.
With the ng-model directive you can bind the value of an input field to a variable created in AngularJS.
You can use the ng-bind directive, which will bind the innerHTML of the element to the specified model property:
ng-model for input elements like input, textarea and ng-bind for h1,label etc.
<!DOCTYPE html>
<html>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<body>
<div ng-controller="index" ng-app="myApp">
<form>
First Name:
<br>
<input type="text" ng-model="user.username">
<br> Last Name:
<br>
<input type="password" ng-model="user.password">
</form>
</div>
<script>
var app = angular.module("myApp", []);
app.controller("index", ["$scope", function($scope) {
$scope.user = {
username: "admin",
password: "admin"
};
}]);
</script>
</body>
</html>
As,Venu prasad H S and domyos already suggested , a reply to the comment of M. Ko as i don't have enough reputation to comment,
You have defined the ng-model out of the scope of the controller,
<div ng-controller="index">
{{message}}
</div>
What this does is that your controller can access only the stuff inside this div only, as many others suggested you can put an entire div in the body you can do
<body ng-app="myApp">
<div ng-controller="index">
<div>
{{message}}
</div>
<form>
First Name:<br>
<input type="text" ng-model="user.username">{{user.username}}<br>
Last Name:<br>
<input type="password" ng-model="user.password">
</form>
</div>
As very aptly provided by domyos , now what this does is that your controller can get to your form and you can display the values you desire.
Alternatively you can also but your controller in the body tag with your ng-app
<body ng-app="myApp" ng-controller="index">
but it is recommended that you put it inside a div, you want to do this so that you can have multiple controllers in one module i.e. on ng-app.
Also, try to name controller as "indexCtrl" as in IndexController it is just a naming convention but that makes your code more readable.
Hope you find this information useful.
Use ng-app and ng-controller directives in your HTML page.
Here is link of Plunker for the same.
Plunker
And donot forget to give reference
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
Related
I'm trying to use AngularJS to validate a form, with the following code:
HTML
<body ng-app="plunker" ng-cloak>
<div ng-controller="MainCtrl as ctrl">
<form name="ctrl.mForm" novalidate>
<input type="text" name="Name" required />
<div ng-show="ctrl.mForm.Name.$invalid">Required</div>
<input type="submit" ng-click="send()" />
</form>
</div>
</body>
JS
import angular from 'angular';
angular.module('plunker', []).controller('MainCtrl', function($scope) {
var vm = this;
vm.send = function () {
alert('ok');
}
});
Plunker
I need to show a div when the input is empty (when the user clicks the submit button is enough), however nothing happens.
What is wrong with this code that it is unable to show the <div> when the input is empty?
Your controler code should have the variable for Name:
angular.module('plunker', []).controller('MainCtrl', function($scope) {
var vm = this;
vm.Name = "";
vm.send = function () {
alert('ok');
}
});
and your input control should use that variable in ng-model
<input type="text" name="Name" ng-model="Name" required />
Here i have updated the plunker
You should use ng-model to validate using angular. i have updated that in plunker. and if you want to use default validation of html required field you should submit form using ng-submit direactive on form element
You have to change the name of your form to "mForm". And on the div you want to show, you have to check if the name field is invalid and if the form got submitted.
<!doctype html>
<html>
<head>
<link rel="stylesheet" href="lib/style.css">
<script src="lib/script.js"></script>
</head>
<body ng-app="plunker" ng-cloak>
<div ng-controller="MainCtrl as ctrl">
<form name="mForm" novalidate>
<input type="text" ng-model="name" name="name" required />
<div ng-show="mForm.name.$invalid && mForm.$submitted"">Required</div>
<input type="submit" ng-click="send()" />
</form>
</div>
</body>
</html>
See this Plunker
Using Angular, I am trying to find away to clear the user input inside a div when its visibility is toggled using ng-show. Ideally, when the conditions are met that cause the div to disappear, it should remove all of the user selected data from the div. Any help would be appreciated!
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<body ng-app="">
<div>
<input type="checkbox" ng-model="varA" ng-init="varA=false"> Item 1
</div>
<div ng-model="varB" ng-show="varA==false">
<input type="checkbox"> Item 2
</div>
</body>
</html>
Use ngChange on your checkbox:
<input type="checkbox" ng-change="checkboxChanged()" ng-model="varA" ng-init="varA=false">
Then in your controller implement the checkboxChanged function:
$scope.checkboxChanged = function() {
$scope.varB = '';
};
By the way, ngModel is meant only for input, select, and textarea only. Do not use ngModel with a div.
You can use the ng-reset-on directive I've written. It can resets all fields based on an expression. You need to specify a controller and the field must have a ng-model.
(function(){
angular.module("app", ["ng-reset-on"]);
angular.module("app").controller("AppCtrl", function() {});
})();
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<script src="https://cdn.rawgit.com/waldirpereira/angular-reset-on/master/dist/angular-reset-on.js"></script>
<body ng-app="app">
<div ng-controller="AppCtrl">
<div>
<input type="checkbox" ng-model="varA" ng-init="varA=false"> Item 1
</div>
<div ng-show="varA==false">
<input type="checkbox" ng-model="varB" ng-reset-on="varA==true"> Item 2
</div>
</div>
</body>
</html>
I have given same controller in two divs but model that gets updated in one div does not reflect in another.
<body ng-app="myApp">
<div ng-controller="filterCtrl">
<p ng-bind="test" />
</div>
<div ng-controller="filterCtrl">
<p><input type="text" ng-model="test" ng-change="handleChange()"></p>
</div>
</body>
When I am entering into the text box it's not updating the above div's "ng--bind". Though, if I put that "ng-bind" in the div having text box, it's working fine. Kindly help me on this.
it should be like that
<html ng-app="myApp">
<body ng-controller="filterCtrl">
<div>
<p>{{test.text}}</p>
</div>
<div>
<p><input type="text" ng-model="test.text" ng-change="handleChange()"></p>
</div>
</body>
</html>
here example on plunker
Nothing bad to reuse controller in your code: fiddle
As you can see they both works, but independently.
It's because each other instantiate its own scope. If you want them to talk, you can to make it via some services or to create some common scope for both of them, or merge them into one controller instance.
You can use parent scope as common part for both.
<div ng-controller="MainCtrlr as c">
<input ng-model="$parent.name" />
Hello, {{$parent.name}}!!!
</div>
<div ng-controller="MainCtrlr as c">
<input ng-model="$parent.name" />
Hello, {{$parent.name}}!!!
</div>
Fiddle
Talk via services will be much better than this:
Code:
angular.module('app', [])
.controller('MainCtrlr', ['MainData', function(MD){
this.MD = MD;
MD.name = 'World';
}]).service('MainData', [function(){}])
Template:
<div ng-controller="MainCtrlr as c">
<input ng-model="c.MD.name" />
Hello, {{c.MD.name}}!!!
</div>
<div ng-controller="MainCtrlr as c">
<input ng-model="c.MD.name" />
Hello, {{c.MD.name}}!!!
</div>
Fiddle
Problem:
If we try to associate same controller with two divs then angular creates two different scopes for those two divs.
And if we try to update scope in one instance then it will not be reflected to other instance.
There are two ways to get rid of from this situation:
You can create one mainCntrl that have filterCtrl as its child controller.
And assumed mainCntrl has mainView scope property. We created a mainView object on the mainCntrl,
and since filterCtrl and its scope prototypally inherit from mainCntrl so we can always reach that mainView in any instance of filterCtrl.
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<html>
<head>
<script>
angular.module('myApp', [])
.controller('mainCntrl', function($scope) {
$scope.mainView = {};
$scope.mainView.x = 'Something';
})
.controller('filterCtrl', function($scope) {
});
</script>
</head>
<body ng-app="myApp">
<div ng-controller="mainCntrl">
<div ng-controller="filterCtrl">
<p ng-bind="mainView.x" />
</div>
<div ng-controller="filterCtrl">
<p><input type="text" ng-model="mainView.x" ng-change="handleChange()"></p>
</div>
</div>
</body>
</html>
We can utilized $parent which can be accessed through $scope.$parent. This place will be the common place for all the instances of filterCtrl.
So whatever we put over $scope.$parent, will be accissible to all the instances.
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<html>
<head>
<script>
angular.module('myApp', [])
.controller('filterCtrl', function($scope) {
$scope.$parent.test = 'Something';
});
</script>
</head>
<body ng-app="myApp">
<div ng-controller="filterCtrl">
<p ng-bind="$parent.test" />
</div>
<div ng-controller="filterCtrl">
<p><input type="text" ng-model="$parent.test" ng-change="handleChange()"></p>
</div>
</body>
</html>
I am new, trying my hands on angular. I made a list of checkbox using ng-repeat, there are five checkboxes and want to open a div only clicking on first checkbox. Don't know how to open.
Plunker
Thank you all in advance...
You can bind the model with checkbox and can toggle the display of the div based on the model value of the desired checkbox. I have created one plnkr for same: http://plnkr.co/edit/zcHbuwsUehDfBkgJWlIc?p=preview
HTML code
//HTML
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Example - example-example12-production</title>
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.5.0/angular.min.js"></script>
<script src="script.js"></script>
</head>
<body ng-app="docsSimpleDirective">
<div ng-controller="Controller">
<div ng-repeat="cb in chkboxArr">
<input type="checkbox" ng-model="chkboxArrModel[$index]">{{$index}}
</div>
<div ng-if="chkboxArrModel[0]">Toggle me with first checkbox</div>
</div>
</body>
</html>
and Javascript code
//JS
(function(angular) {
'use strict';
angular.module('docsSimpleDirective', [])
.controller('Controller', ['$scope', function($scope) {
$scope.chkboxArr = [1,2,3,4];
$scope.chkboxArrModel = [];
}]);
})(window.angular);
Here is an example:
<div ng-show="checkbox1">Show me</div>
<input type="checkbox" ng-model="checkbox1"/>
<input type="checkbox" ng-model="checkbox2" />
<input type="checkbox" ng-model="checkbox3" />
Try this
<div ng-show="chk1">Div1</div>
<input type="checkbox" ng-model="chk1"/>
You can create a div like this:
<div ng-show="ModelData.Passengers == 'One'">
The actual div content you have in the div you want.
</div>
Assuming your radio buttons code to be like this:
<div>
<label>
<input type="radio" id="PassengersId1" name="PassengersName1" ng-model="ModelData.Passengers" value="One" />One
<input type="radio" id="PassengersId2" name="PassengersName2" ng-model="ModelData.Passengers" value="Two" />Two
</label>
</div>
I have a simple form.
<html lang="en" ng-app="MyApp">
<head>
</head>
<body ng-controller="AppCtrl">
<form name="myForm" id="myForm">
<input type="text" ng-model="field" name="myField" />
<div ng-show="myForm.myField.$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.