Need help with simple angularjs programming - javascript

I am trying to do simple programming in angularjs. I have created two buttons. The first button has text "clickHere", and the second has no text. My task is when I click the button that has text, it will automatically get empty and the second button will have the same text. (and vice versa).
var myApp = angular.module('myApp',[]);
function MyCtrl($scope) {
$scope.name = 'Superhero';
$scope.name1 = '';
var val = 'Hello';
$scope.click0 = function() {
//alert("hello!");
$scope.name = $scope.name1;
$scope.name1="";
//return val;
};
$scope.click1 = function() {
//alert("hello!");
$scope.name1 = $scope.name;
$scope.name="";
// return val;
};
}
<body ng-app="myApp">
<div ng-controller="MyCtrl">
<button ng-click="click0()" >{{name}}</button>
<button ng-click="click1()" >{{name1}}</button>
</div>
</body>
Here is my code in jsfiddle. http://jsfiddle.net/simpleorchid/a65zV/

I think your issue was you were overwriting your stored value. I added a $scope variable called word, and now it works:
var myApp = angular.module('myApp',[]);
function MyCtrl($scope) {
$scope.word = 'Superhero';
$scope.name = $scope.word;
$scope.name1 = '';
$scope.click0 = function() {
$scope.name1 = $scope.word;
$scope.name="";
};
$scope.click1 = function() {
$scope.name = $scope.word;
$scope.name1="";
};
}
Udpated Fiddle: http://jsfiddle.net/pWjLR/1/

Just replace the click1() with click0() like in the JSFiddle here and everything will work just as you want it to.

Related

AngularJS - To Do App Place Submit and Delete Function into Factories

I've created a simple To Do App and while working on it I felt like I will end up placing too much code into my Controller and will eventually get messy and hard to read. I want to know how can I move my functions into factories so that my code can look somewhat cleaner.
Here is my JS:
angular.module('toDoApp', [])
.controller('toDoCtrl', function($scope){
//set $scope variables
$scope.tasks = [];
$scope.submitTask = function(){
$scope.tasks.unshift($scope.enteredTask);
$scope.enteredTask = '';
};
$scope.removeTask = function(task) {
var i = $scope.tasks.indexOf(task);
$scope.tasks.splice(i, 1);
};
})
.factory('toDoFactory', ['$http', function($http){
return function(newTask) {
};
}])
Here is the HTML if needed:
<form ng-submit="submitTask()">
<!-- task input with submit button -->
<label>Task: </label>
<input type="text" placeholder="Enter Task" ng-model="enteredTask" required>
<button>Submit</button>
</form>
<div>
<!-- create unordered list for task that are submitted
need check boxes -->
<ul>
<li ng-repeat="task in tasks">
{{ task }}
<button ng-click="removeTask()">x</button>
</li>
</ul>
</div>
As you can see I kinda started the factory but just don't know how to go about it.
Any suggestions will be greatly appreciated.
You will need to inject your factory inside controller and then use the methods defined in the factory from the controller:
angular.module('toDoApp', [])
.controller('toDoCtrl', function($scope, toDoFactory){
//set $scope variables
$scope.tasks = [];
$scope.submitTask = function(){
toDofactory.submittask(); //Just for demo.Passin your parameters based on your implementation
};
$scope.removeTask = function(task) {
var i = $scope.tasks.indexOf(task);
$scope.tasks.splice(i, 1);
};
})
.factory('toDoFactory', ['$http', function($http){
var methods = {};
methods.submittask = function(){
//your logic here
};
methods.removetask = function(){
//your logic here
}
return methods;
}])
var app = angular.module('toDoApp', []);
app.controller('toDoCtrl', function($scope, toDoFactory){
$scope.tasks = [];
toDoFactory.get = function(){
}
toDoFactory.delete = function(){
}
toDoFactory.update = function(){
}
});
app.factory('toDoFactory', ['$http', function($http){
var todo = {};
todo.get = function(){
};
todo.delete = function(){
};
todo.update = function(){
}
return todo;
}]);
This is simple architecture, you can add more logic,
Make sure you know about dependency injection(DI)
Here is the answer for those that want to see what the end result will look like when all the code is plugged in. Thanks again for the answers as it was able to guide me in the right direction.
.controller('toDoCtrl', function($scope, toDoFactory){
$scope.tasks = toDoFactory.tasks;
$scope.submitTask = function(){
toDoFactory.submitTask($scope.enteredTask);
$scope.enteredTask = '';
};
$scope.removeTask = function(task) {
toDoFactory.removeTask();
};
})
.factory('toDoFactory', ['$http', function($http){
var toDo = {
tasks: [],
enteredTask: '',
submitTask: function(task){
toDo.tasks.unshift(task);
},
removeTask: function(task) {
var i = toDo.tasks.indexOf(task);
toDo.tasks.splice(i, 1);
}
};
}])

Input field not being updated from controller in Angularjs

I am in learning phase of Angularjs and am stuck in a problem for last two days. I have seen lots of answer but don't know how to adapt those solutions in my case. What I want to do is update the input field via buttons using angularjs.
// html
<body ng-controller="Controller">
<input type="number" ng-model="data" update-view>
<br>
<label for="data">{{data}}</label>
<button name="btn1" ng-click='updateInput(1)'>1</button>
</body>
// js
var app = angular.module('calculator',[]);
app.controller('Controller', function($scope, $timeout){
$scope.data = 0;
var val = '';
$scope.updateInput = function(param) {
val += String(param);
$scope.data = val;
// val = param;
// $scope.data = val;
}
});
The expressions gets evaluated but the input field is not updating. I have seen other updating views with $setViewValue and $render but I don't know how to use them here.
app.directive('updateView', function () {
return {
restrict: 'A',
require: 'ngModel',
link: function (scope, element, attrs, ngModel) {
element.bind('change', function () {
// console.log(ngModel);
scope.$apply(setAnotherValue);
});
function setAnotherValue() {
ngModel.$setViewValue(scope.data);
ngModel.$render();
}
}
};
});
Any help would be appreciated. Thanks
You don't need a directive for updating.
You seem to be setting a string value to $scope.data, which throws an error, because the input type is number.
angular.module('calculator', [])
.controller('Controller', function($scope){
$scope.data = 0;
var val = '';
$scope.updateInput = function(n){
val = n;
$scope.data = val;
};
});
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.5/angular.min.js"></script>
<body ng-app="calculator" ng-controller="Controller">
<input type="number" ng-model="data">
<button ng-click="updateInput(1)">1</button>
</body>
I was noting that without converting the parameter into string, the input field would update with the changed model but as soon as I would change it into String, it would not update the input field. Also there was error thrown in console. So I just, on hit and trial basis, converted it back to int by changing only one piece of line $scope.data = val; into $scope.data = parseInt(val, 10); and hurrrayyy the input field is all updating just like I wanted. And as #cither suggested, I don't need to directive for this. Following is my working code
var app = angular.module('calculator',[]);
app.controller('Controller', function($scope, $timeout){
$scope.data = 0;
var val = '';
$scope.updateInput = function(param) {
val += String(param);
$scope.data = parseInt(val, 10);
}
});

My ng-model is not updating first time

i am having a problem with ng-model .When i am adding tag from suggestion list its not updating model value until i am not deleting tags and adding again.In my project its working fine but for plunker only its happening.Please check this out and help me..
thank you..
Here is my html:-
<tags-input ng-model="tags2" display-property="tagName" on-tag-added="getTags()" id="target">
<auto-complete source="loadTags($query)" min-length="2"></auto-complete>
</tags-input>
<p>{{tags2}}</p>
Here is my js:-
var app = angular.module('myApp', ['ngTagsInput', 'ui.bootstrap']);
app.controller(
'myController',
function($scope, $http) {
$scope.tagsValues =[];
$scope.loadTags = function(query) {
return $http.get('tags.json');
};
$scope.getTags = function() {
$scope.tagsValues = $scope.tags2.map(function(tag) {
return tag.tagId;
});
alert(" Tag id is :"+ $scope.tagsValues);
};
});
Here is my plunker:-
http://plnkr.co/edit/6Mr2qk2S2RvGJLevf2UI?p=preview
All you have to do to make this work, is define and initialize the variable $scope.tags2 first:
var app = angular.module('myApp', ['ngTagsInput', 'ui.bootstrap']);
app.controller(
'myController',
function($scope, $http) {
$scope.tagsValues = '';
$scope.tags2 = [];
$scope.loadTags = function(query) {
return $http.get('tags.json');
};
$scope.getTags = function() {
$scope.tagsValues = $scope.tags2.map(function(tag) {
return tag.tagId;
});
alert(" Tag id is :"+ $scope.tagsValues);
};
});
See my plunker: http://plnkr.co/edit/Y3f8kLBnexOXg5gwmldL?p=preview

Controller hiding $scope.var in another controller with angular

I have 2 controllers. I want to make a simple toggle where if a function is called it hides code in the other controller. Here is what I have...
Angular:
var app = angular.module('plunker', []);
app.factory('data', function () {
var fac = [];
fac.hideIt = function (hide) {
console.log(hide)
if (hide != null)
return true;
else
return false;
};
return fac;
});
app.controller('MainCtrl', function($scope, data) {
$scope.name = 'World';
console.log(data.hideIt()); //its false
$scope.hide = data.hideIt();
});
app.controller('SecCtrl', function($scope, data) {
$scope.hideAbove = function () {
var hide = true;
data.hideIt(hide);
console.log(data.hideIt(hide)) //now it is true
}
});
HTML:
<div ng-controller="MainCtrl">
<div ng-if="hide == false">
<p>Hello {{name}}!</p>
</div>
</div>
<div ng-controller="SecCtrl">
<div ng-click="hideAbove()">CLICK HERE </div>
</div>
Link to Plunkr:
http://plnkr.co/edit/zOAf5vGMTAd8A10NGiS1?p=preview
Is there no way to use a controller to hide code that is in another controller?
You dont need to use $emit, $rootScope.$broadcast or something else
in your code you asked to the factory the value of a local variable, you cant updates it because each time you start the method a new variable was created;
Here is a working example, hope it will help you
http://plnkr.co/edit/jBc3DJnzXNJUiVVwRAPw?p=preview
The factory declare some useful methods like updates and gets hide value
app.factory('HideFactory', function () {
var prototype = {};
var hide = false;
prototype.getDisplayMode = function() {
return hide;
}
prototype.hideIt = function (val) {
hide = typeof val == 'boolean' ? val : false;
return val;
};
return prototype;
});
The controllers declare some variables which are a reference to the factory methods
app.controller('MainCtrl', ['$scope', 'HideFactory',function($scope, HideFactory) {
$scope.name = 'World';
$scope.isHide = HideFactory.getDisplayMode;
}]);
app.controller('SecCtrl', ['$scope', 'HideFactory', function($scope, HideFactory) {
$scope.isHide = HideFactory.getDisplayMode;
$scope.hideAbove = function() {
HideFactory.hideIt(true);
}
}]);
And the html, the ng-if directive call the isHide method, linked to the getDisplayMode method of the factory
<body>
<div ng-controller="MainCtrl">
<div ng-if="!isHide()">
<p>Hello {{name}}!</p>
</div>
</div>
<div ng-controller="SecCtrl">
<div ng-click="hideAbove()">CLICK HERE </div>
</div>
</body>
You're about halfway there with your factory, you have most of a setter but not a getter. Here's what I'd change.
Factory:
app.factory('data', function () {
var fac = [];
var state = false;
fac.hideIt = function (hide) {
state = hide;
};
fac.hidden = function() {
return state;
}
return fac;
});
Controller:
app.controller('MainCtrl', function($scope, data) {
$scope.name = 'World';
$scope.hide = data.hidden;
});
HTML:
<div ng-controller="MainCtrl">
<div ng-hide="hide()">
<p>Hello {{name}}!</p>
</div>
</div>
Forked Plunker
please see here: http://plnkr.co/edit/3NEErc0zUpXlb1LarXar?p=preview
var app = angular.module('plunker', []);
app.factory('data', function() {
var fac = [];
var _hide = {};
hideIt = function(hide) {
console.log("from fact " + hide)
if (hide !== null) {
_hide.state = true;
return _hide;
} else
_hide.state = false;
return _hide;
};
return {
fac: fac,
hideIt: hideIt,
hide: _hide
};
});
app.controller('MainCtrl', function($scope, data) {
$scope.name = 'World';
//console.log(data.hideIt()); //its false
$scope.hide = data.hide;
});
app.controller('SecCtrl', function($scope, data) {
$scope.hideAbove = function() {
var hide = true;
data.hideIt(hide);
}
});
HTML:
<div ng-if="hide.state != true">
<p>Hello {{name}}!</p>
</div>
</div>
<div ng-controller="SecCtrl">
<div ng-click="hideAbove()">CLICK HERE</div>
</div>
</body>
You want to use $emit.
function firstCtrl($scope){
$scope.$on('someEvent', function(event, data) { console.log(data); });
}
function secondCtrl($scope){
$scope.$emit('someEvent', [1,2,3]);
}

alternative method instead $watch in angularjs

I have a scope variable, when it returns true, i need to trigger some events or do something. I my case, the every first time, the scope variable returns undefined and later it returns true. In this case i used $watch method to get the expected funcionality. Is there any alternative approach to do the same instead using $watch ?
scope.$watch () ->
scope.initiateChild
, (value) ->
if value is true
$timeout ->
scope.buildOnboarding()
, 1000
You can try using AngularJS $on(), $emit() and $broadcast().
Here is an example: http://www.binaryintellect.net/articles/5d8be0b6-e294-457e-82b0-ba7cc10cae0e.aspx
You can use JavaScript getters and setters without any expense of using $watch.
Write code in the setter to do what you want when angular changes the your model's value you are using in scope. It gets null or an a State object as user types. Useful for working with type ahead text boxes that have dependencies on each other. Like list of counties after typing state without user selecting anything.
Here is some pseudo style code to get the idea.
<input ng-model="searchStuff.stateSearchText" />
<div>{{searchStuff.stateObject.counties.length}}</div>
<div>{{searchStuff.stateObject.population}}</div>
$scope.searchStuff=new function(){var me=this;};
$scope.searchStuff.stateObject = null;
$scope.searchStuff.getStateObjectFromSearchText = function(search){
// get set object from search then
return stateObject;
};
$scope.searchStuff._stateSearchText= "";
Object.defineProperty($scope.searchStuff, 'stateSearchText', {
get: function () {
return me._stateSearchText;
},
set: function (value) {
me,_stateSearchText = value;
me.stateObject = getStateObjectFromSearchText (value);
}
});
See this fiddle: http://jsfiddle.net/simpulton/XqDxG/
Also watch the following video: Communicating Between Controllers
A sample example is given below
Html:
<div ng-controller="ControllerZero">
<input ng-model="message" >
<button ng-click="handleClick(message);">LOG</button>
</div>
<div ng-controller="ControllerOne">
<input ng-model="message" >
</div>
<div ng-controller="ControllerTwo">
<input ng-model="message" >
</div>
javascript:
var myModule = angular.module('myModule', []);
myModule.factory('mySharedService', function($rootScope) {
var sharedService = {};
sharedService.message = '';
sharedService.prepForBroadcast = function(msg) {
this.message = msg;
this.broadcastItem();
};
sharedService.broadcastItem = function() {
$rootScope.$broadcast('handleBroadcast');
};
return sharedService;
});
function ControllerZero($scope, sharedService) {
$scope.handleClick = function(msg) {
sharedService.prepForBroadcast(msg);
};
$scope.$on('handleBroadcast', function() {
$scope.message = sharedService.message;
});
}
function ControllerOne($scope, sharedService) {
$scope.$on('handleBroadcast', function() {
$scope.message = 'ONE: ' + sharedService.message;
});
}
function ControllerTwo($scope, sharedService) {
$scope.$on('handleBroadcast', function() {
$scope.message = 'TWO: ' + sharedService.message;
});
}
ControllerZero.$inject = ['$scope', 'mySharedService'];
ControllerOne.$inject = ['$scope', 'mySharedService'];
ControllerTwo.$inject = ['$scope', 'mySharedService'];

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