Develop Reference

How to pass data from input to a custom service?

I am new to AngularJS and I have a problem: how to display the hex equivalent of the number inserted into the input box?
I am using ng-change to see if the input is modified and the output should also change according to the input.
This is the code:
<div ng-app="myApp" ng-controller="myCtrl">
<input type="number" ng-model="in" ng-change="hex(in)">
{{in}} <br>{{hex}}
</div>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.js"></script>
<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.in= 11;
$scope.hex = hexafy.myFunc($scope.in);
});
</script>

Why it does not work?
In your input, you try to call a function:
<input type="number" ng-model="in" ng-change="hex(in)">
But $scope.hex is not a function in your controller:
$scope.hex = hexafy.myFunc($scope.in);
How to fix it?
Change it to:
$scope.hex = function() {
$scope.result = hexafy.myFunc($scope.in);
}
var app = angular.module('myApp', []);
app.service('hexafy', function() {
this.myFunc = function (x) {
return x.toString(16);
}
});
app.controller('myCtrl', function($scope, hexafy) {
$scope.in= 11;
$scope.hex = function() {
$scope.result = hexafy.myFunc($scope.in);
};
});
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.js"></script>
<div ng-app="myApp" ng-controller="myCtrl">
<input type="number" ng-model="in" ng-change="hex()">
{{in}} <br>{{result}}
</div>

Created Plunker. Problem is that you are using function name as assignment.
<input type="number" ng-model="in" ng-change="convertToHex(in)">
$scope.convertToHex= function(value) {
$scope.hex = hexafy.myFunc(value);
}

How to bind a value from one ng-model to an other by matching a specific string

I got a requirement to bind a value to a particular model when the value in the other model contains a string starting with "https".
For example, I have two text fields both fields having different model
<input type="text" ng-model="modelText1">
<input type="text" ng-model="modelText2">
Suppose I type a value on the first text field "https", the first input model modelText1 have to bind to the second input model modelText2 and later on i have to maintain it as like two-way binding. i.e. the second field will automatically get the value dynamically when it contains "https" at starting of a string.

Try it like in this Demo fiddle.
View
<div ng-controller="MyCtrl">
<input type="text" ng-model="modelText1">
<input type="text" ng-model="modelText2">
</div>
AngularJS Application
var myApp = angular.module('myApp',[]);
myApp.controller('MyCtrl', function ($scope) {
$scope.modelText1 = '';
$scope.modelText2 = '';
var regEx = new RegExp(/^https/);
$scope.$watch('modelText1', function (newValue) {
if (newValue.toLowerCase().match(regEx)) {
$scope.modelText2 = newValue;
} else {
$scope.modelText2 = '';
}
});
});
An other approach is (that avoid using of $watch) is to use AngularJS ng-change like in this
example fiddle.
View
<div ng-controller="MyCtrl">
<input type="text" ng-model="modelText1" ng-change="change()">
<input type="text" ng-model="modelText2">
</div>
AngularJS Application
var myApp = angular.module('myApp',[]);
myApp.controller('MyCtrl', function ($scope) {
$scope.modelText1 = '';
$scope.modelText2 = '';
var regEx = new RegExp(/^https/);
$scope.change = function () {
if ($scope.modelText1.toLowerCase().match(regEx)) {
$scope.modelText2 = $scope.modelText1;
} else {
$scope.modelText2 = '';
}
};
});

You can use the ng-change directive like this:
<input type="text" ng-model="modelText1" ng-change="onChange()">
<input type="text" ng-model="modelText2">
and your controller:
$scope.onChange = function() {
if ($scope.modelText1 === 'https') {
$scope.modelText2 = $scope.modelText1;
else
$scope.modelText2 = '';
};

use ng-change to check the text is equal to 'https'
angular.module('app',[])
.controller('ctrl',function($scope){
$scope.changeItem = function(item){
$scope.modelText2 = "";
if(item.toLowerCase() === "https"){
$scope.modelText2 = item
}
}
})
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="app" ng-controller="ctrl">
<input type="text" ng-model="modelText1" ng-change="changeItem(modelText1)">
<input type="text" ng-model="modelText2">
</div>
EDiTED
to make sure it does't fail under 'HTTPS' use toLoweCase function to make all lower case

HTML :
<input type="text" ng-model="modelText1" ng-change="updateModal(modelText1)">
JS :
var modelText1 = $scope.modelText1.toLowerCase();
$scope.updateModal = function(){
$scope.modelText2 = '';
if(modelText1.indexOf('https')!=-1){
$scope.modelText2 = modelText1;
}
}

you could also possibly do this as a directive if you want to have a more reusable solution over multiple views http://jsfiddle.net/j5ga8vhk/7/
It also keeps the controller more clean, i always try to use the controller only for controlling complex business logic and business data
View
<div ng-controller="MyCtrl">
<input type="text" ng-model="modelText1" >
<input type="text" ng-model="modelText2" model-listener="modelText1" model-listener-value="https" >
</div>
Angular JS
var myApp = angular.module('myApp',[]);
myApp.controller('MyCtrl', function ($scope) {
$scope.modelText1 = '';
$scope.modelText2 = '';
});
myApp.directive('modelListener', [function() {
return {
restrict: 'A',
controller: ['$scope', function($scope) {
}],
link: function($scope, iElement, iAttrs, ctrl) {
$scope.$watch(iAttrs.modelListener, function() {
if($scope[iAttrs.modelListener] === iAttrs.modelListenerValue ) {
$scope[iAttrs.ngModel] = $scope[iAttrs.modelListener];
} else {
$scope[iAttrs.ngModel] = "";
}
}, true);
}
};
}]);

Setting data-ng-model in JavaScript

I need to set the data-ng-model attribute of an html input field via javascript.
I know I can't do
element.data-ng-model = "...";
because of the dashes. So I tried
element.["data-ng-model"] = "...";
and
element.dataNgModel = "...";
and
element.datangmodel = "...";
None of these seem to work properly.
Any suggestions?

Try:
element.setAttribute("ng-model", "...");
or if you have JQuery:
$(element).attr("ng-model", "...");

If you need to set the model with javascript you can set it in the controller see below From the angular docs
https://docs.angularjs.org/api/ng/directive/ngModel
(function(angular) {
'use strict';
angular.module('getterSetterExample', [])
.controller('ExampleController', ['$scope',
function($scope) {
var _name = 'Brian';
$scope.user = {
name: function(newName) {
// Note that newName can be undefined for two reasons:
// 1. Because it is called as a getter and thus called with no arguments
// 2. Because the property should actually be set to undefined. This happens e.g. if the
// input is invalid
return arguments.length ? (_name = newName) : _name;
}
};
}
]);
})(window.angular);
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.5.5/angular.min.js"></script>
<div ng-app="getterSetterExample">
<div ng-controller="ExampleController">
<form name="userForm">
<label>Name:
<input type="text" name="userName" ng-model="user.name" ng-model-options="{ getterSetter: true }" />
</label>
</form>
<pre>user.name = <span ng-bind="user.name()"></span></pre>
</div>
</div>

Function in AngularJs

I want to do a validation. I want exact this validation but in angularJS I am new to AngularJS and I am trying to write a function which uses if else loop. But i don't know how to write a function. Here which i have tried till now. How to call a function in html page? please anyone can help me with this.
var app = angular.module("MyApp", ["ngAnimate","ngMessages"]);
app.controller('MyCtrl', function($scope, $timeout) {
$scope.name = '';
$scope.validate = function(NetProfit) {
if (NetProfit < 500 || NetProfit > 800) {
$scope.greeting = 'Your payment must be between £500 and £800';
}
else {
$scope.greeting = '';
}
};
});
html code
<input ng-model="name2" name="name2" id="NetProfit" type="text">
{{greeting}}

You can write
<input ng-model="name2" name="name2" id="name2id" type="text" ng-change='validate(name2)'>
{{greeting}}
ngChange documentation is here
But the best way of doing this is to use $validators of ngModelController
ngModelController documentation here

Use ng-change directive which will invoke handler(expression) every time value is changed..
Try this:
var app = angular.module("MyApp", []);
app.controller('MyCtrl', function($scope, $timeout) {
$scope.name = '';
$scope.validate = function(NetProfit) {
if (NetProfit < 500 || NetProfit > 800) {
$scope.greeting = 'Your payment must be between £500 and £800';
} else {
$scope.greeting = '';
}
};
});
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app='MyApp' ng-controller='MyCtrl'>
<input ng-model="name2" name="name2" id="NetProfit" type="text" ng-change='validate(name2)'>{{greeting}}
</div>
Fiddle here

Angular pass input value to $rootScope variable

I have situation where I want to use $rootScope variable and update its value with the one entered in input field. I have sitauation code shortened to this DEMO:
HTML:
<div ng-controller="MyCtrl">
<input type="text" ng-model="foo" placeholder="Enter something" />
<input type="button" ng-click="doSomething()" value="Send" ng-disabled="foo == null" />
</div>
SCRIPT:
var myApp = angular.module('myApp', []);
function MyCtrl($scope, $rootScope) {
$rootScope.foo = null;
$scope.doSomething = function () {
alert("Hello, " + $rootScope.foo);
}
}
Any suggestions on how to pass input value to $rootScope variable would be great!

Although not recommended, Still if you want you can do it the following way
<div ng-controller="MyCtrl">
<input type="text" ng-model="foo" placeholder="Enter something" ng-change="onFooChange()" />
<input type="button" ng-click="doSomething()" value="Send" ng-disabled="foo == null" />
</div>
Script
var myApp = angular.module('myApp', []);
function MyCtrl($scope, $rootScope) {
$rootScope.foo = null;
$scope.onFooChange = function(){
$rootScope.foo = angular.copy($scope.foo);
}
$scope.doSomething = function () {
alert("Hello, " + $rootScope.foo);
}
}
When the value of text field is changed onFooChange function is called and the value is stored into $rootScope.

Here is an approach without using ng-change:
function MyCtrl($scope, $rootScope) {
$scope.foo=null;
$scope.doSomething = function () {
$rootScope.foo=$scope.foo;
alert("Hello, " + $rootScope.foo);
}
}