AngularJS Tutorial 2
In this part of my AngularJS tutorial I’m going to cover Form Validation, Using $rootScope to share data between controllers, Controller Inheritance, Filters, Custom Filters and a whole lot more.
If you haven’t watched part 1 of my AngularJS tutorial definitely watch it or you’ll be very confused. All of the code covered in this tutorial follows the video down below to act as a transcript and cheat sheet for AngularJS.
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Code From the Video
angulartut5.html
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<!doctype html> <html ng-app="app5" ng-cloak> <head> <title>AngularJS Tutorial 5</title> <style> [ng\:cloak], [ng-cloak], .ng-cloak { display: none; } table{ width: 400px; text-align: left; border: 2px solid black; padding: 10px; } input.ng-dirty.ng-invalid { border-color: red; } </style> </head> <body> <div id="groceryList" ng-controller="gListCtrl"> <h3>Grocery List</h3> <table> <thead> <tr> <th>Item</th> <th>Purchased</th> <tr> </thead> <tr ng-repeat="grocery in groceries"> <td>{{grocery.item}}</td> <td> <!-- Bind the checkbox to the data model --> <input type="checkbox" ng-model="grocery.purchased" /> </td> </tr> </table> <br> <!-- User enters a new item and when the button is clicked the value in the input box is added to the array --> <label>New Item : <input type="text" ng-model="newItem" /> </label> <button ng-click="addItem(newItem)">Add Item</button> <!-- Error shows here if no item was entered --> <h4>{{missingNewItemError}}</h4> </div> <!-- End of groceryList --> <div ng-controller="userCtrl"> <!-- Pass the user data to saveUser() --> <form name="userForm" ng-submit="saveUser(userInfo)"> <label>First Name:</label> <!-- Define that a value is required and it must be 2 characters in length or more --> <input type="text" name="fName" ng-model="userInfo.fName" ng-required="true" ng-minlength="2" /> <!-- $dirty is set to true if a user interacts with a element and then we check if the elements required field is true --> <span class="error-message" ng-show="userForm.fName.$dirty && userForm.fName.$error.required">Must Enter a First Name </span> <!-- Check if the element has been edited and whether it contains at least 2 characters --> <span class="error-message" ng-show="userForm.fName.$dirty && userForm.fName.$error.minlength">Must be a Minimum of 2 Characters</span> <br><br> <label>Last Name:</label> <input type="text" name="lName" ng-model="userInfo.lName" ng-required="true" ng-minlength="2" /> <span class="error-message" ng-show="userForm.lName.$dirty && userForm.lName.$error.required">Must Enter a Last Name </span> <span class="error-message" ng-show="userForm.lName.$dirty && userForm.lName.$error.minlength">Must be a Minimum of 2 Characters</span> <br><br> <label>Street:</label> <input type="text" name="street" ng-model="userInfo.street" ng-required="true" ng-minlength="6" ng-pattern="/^(\d{3,})\s?(\w{0,5})\s([a-zA-Z]{2,30})\s([a-zA-Z]{2,15})\.?\s?(\w{0,5})$/" /> <span class="error-message" ng-show="userForm.street.$dirty && userForm.street.$invalid">Must Enter a Number, Street and Street Type (ex: 123 Main St) </span> <br><br> <label>Subscribe:</label> <input type="checkbox" name="subscribe" ng-model="userInfo.subscribe" ng-true-value="'Subscribe'" ng-false-value="'Don\'t Subscribe'" /> <br><br> <label>Delivery Method:</label> <select name="delivery" ng-model="userInfo.delivery" ng-required="true"> <option value="Email">Email</option> <option value="Mail">Mail</option> </select> <br><br> <!-- Disable the button until every element in the form is valid --> <input type="submit" value="Save" ng-disabled="userForm.$invalid"/> <!-- Output new users --> <ul> <li ng-repeat = "item in user"> {{ 'User: ' + item.fName + " " + item.lName + " " + item.street + " " + item.subscribe + " " + item.delivery}} </li> </ul> </div> <!-- End of userCtrl --> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.9/angular.min.js"></script> <script src="js/exam5.js"></script> </body> </html> |
exam5.js
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var app5 = angular.module('app5', []); app5.controller('gListCtrl', function($scope) { $scope.groceries= [ {item: "Tomatoes", purchased: false}, {item: "Potatoes", purchased: false}, {item: "Bread", purchased: false}, {item: "Hummus", purchased: false} ]; // Receives the new item entered in the input box and puts // it on the end of the array $scope.addItem = function(newItem) { // Check that the input box has a value if(!(newItem === undefined || newItem === "")){ $scope.groceries.push({ item: newItem, purchased: false }); $scope.missingNewItemError = ""; } else { // Show an error if no item was entered $scope.missingNewItemError = "Please Enter an Item"; } }; }); app5.controller('userCtrl', function($scope) { $scope.user= [{ fName: "Derek", lName: "Banas", street: "123 Main St", subscribe: "Subscribe", delivery: "Email" }]; $scope.saveUser = function(userInfo) { if($scope.userForm.$valid) { $scope.user.push({ fName: userInfo.fName, lName: userInfo.lName, street: userInfo.street, subscribe: userInfo.subscribe, delivery: userInfo.delivery }); console.log('User Saved'); } else { console.log('Error : Couldn\'t Save User'); } } }); |
angulartut6.html
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<!doctype html> <html ng-app="app6" ng-cloak> <head> <title>AngularJS Tutorial 6</title> <style> [ng\:cloak], [ng-cloak], .ng-cloak { display: none; } </style> </head> <body> <!-- Demonstrating how to use $rootScope to share data between 2 controllers --> <div ng-controller="heroCtrl"> <!-- Search for heroes in the scope --> <label>Hero to Search for : </label> <input type="text" ng-model="heroName" /> <br><br> <button ng-click="getHeroData()">Submit</button> <br><br> {{heroData}}<br> </div> <div ng-controller="heroCtrl"> <!-- Add new heroes --> <label>Hero Name : </label> <input type="text" ng-model="heroName" /><br><br> <label>Real Name : </label> <input type="text" ng-model="realName" /><br><br> <button ng-click="addHeroData(realName, heroName)">Add</button> </div> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.9/angular.min.js"></script> <script src="js/exam6.js"></script> </body> </html> |
exam6.js
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var app6 = angular.module('app6', []); // If you use a controller twice on one page each controller // has its own $scope. You can update the $scopes however // by using the $rootScope. app6.controller('heroCtrl', function($scope, $rootScope) { $scope.hero = [ {realName: "Bruce Wayne", heroName: "Batman"}, {realName: "Clark Kent", heroName: "Superman"}, ]; // Receives the hero to look up $scope.getHeroData = function(){ heroSearch($scope.heroName); }; // Searches through the hero array for a match function heroSearch(name){ // If a her is found it is returned $scope.heroData = "Not Found"; for(var i=0; i < $scope.hero.length; i++){ if ($scope.hero[i].heroName === name){ $scope.heroData = $scope.hero[i].realName + " is " + $scope.hero[i].heroName; } } } // If a broadcast is caught named heroUpdated the new heroUpdated // is added to the other controllers $scope $scope.$on("heroUpdated", function(event, args){ console.log("Real : " + args.realName + " Hero : " + args.heroName); $scope.hero.push({ realName: args.realName, heroName: args.heroName }); }); // When a new hero is added we broadcast the update to the // other controllers $scope $scope.addHeroData = function(realName, heroName){ $rootScope.$broadcast("heroUpdated", { realName: realName, heroName: heroName }); console.log("Real : " + realName + " Hero : " + heroName); }; }); |
angulartut7.html
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<!doctype html> <html ng-app="app7" ng-cloak> <head> <title>AngularJS Tutorial 7</title> <style> [ng\:cloak], [ng-cloak], .ng-cloak { display: none; } </style> </head> <body> <!-- Demonstrating how to use controller inheritance --> <div ng-controller="mainCtrl as parent"> <!-- Display parent data --> <p>Name : {{parent.name}}</p> <p>Sound : {{parent.sound}}</p> <button ng-click=parent.animalClick()>Animal Data</button><br> </div> <div ng-controller="dogCtrl as dog"> <p>Name : {{dog.child.name}}</p> <p>Sound : {{dog.child.sound}}</p> <!-- Call the parent method using the dog fields --> <button ng-click=dog.child.animalClick()>Dog Data</button><br><br> <!-- Call the dog method --> <button ng-click=dog.child.dogData()>More Dog Data</button><br><br> <!-- Change a field value --> <input ng-model="dog.child.bark" /><br><br> <span>New Bark : {{dog.child.bark}}</span> </div> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.9/angular.min.js"></script> <script src="js/exam7.js"></script> </body> </html> |
exam7.js
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var app7 = angular.module('app7', []); app7.controller('mainCtrl', function() { // Define 2 fields that are bound to this controller // This is an example of a scopeless controller using this this.name = "Animal"; this.sound = "Grrrrr"; // Bound method this.animalClick = function(){ alert(this.name + " says " + this.sound); }; }); // The $controller service allows us to instantiate a controller // inside of another controller app7.controller('dogCtrl', function($controller) { var childCtrl = this; // Create an instance of the parent controller childCtrl.child = $controller('mainCtrl', {}); // Overwrite the parent name field childCtrl.child.name = "Dog"; // Define a field for the child childCtrl.child.bark = "Wooof"; // You can extend the child controller by declaring your own methods childCtrl.child.dogData = function(){ alert(this.name + " says " + this.sound + " and " + this.bark); } }); |
angulartut8.html
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<!doctype html> <html ng-app="app8" ng-cloak> <head> <title>AngularJS Tutorial 8</title> <style> [ng\:cloak], [ng-cloak], .ng-cloak { display: none; } </style> </head> <body> <!-- Filters transform data in the view without altering it in the scope using the pipe character --> <div ng-controller="mainCtrl"> <!-- Uppercase --> <label>Make Uppercase : </label> <input type="text" ng-model="name"> <p>Uppercase : {{name | uppercase}}</p> <!-- Lowercase --> <p>Lowercase : {{name | lowercase}}</p> <!-- Currency Filter --> <label>Currency Filter : </label> <input type="text" ng-model="money"> <p>Uppercase : {{money | currency}}</p> <!-- Filter filter Change the order direction by putting -gpa --> <ul> <li ng-repeat = "student in student.gpas | filter: studentName |orderBy:'gpa'"> {{ 'Name: ' + student.name + ' : GPA: ' + student.gpa }} </li> </ul> <!-- Number Filter --> <label>Number Filter : </label> <input type="text" ng-model="numVal"> <p>Default : {{numVal | number}}</p> <p>No Fractions : {{numVal | number:0}}</p> <p>Negative 4 Decimals : {{-numVal | number:4}}</p> <!-- Date Filter https://docs.angularjs.org/api/ng/filter/date --> <p>Date 1 : {{currDate | date:'medium'}}</p> <p>Date 2 : {{currDate | date:"MM/dd/yyyy 'at' h:mma"}}</p> <!-- LimitTo Filter --> <p>Default : {{randomStr}}</p> <p>10 Characters : {{randomStr | limitTo:10}}</p> <p> <ul> <li ng-repeat="item in randArray | limitTo:3"> {{item}} </li> </ul> </p> <!-- Custom Filter Different unicode characters are returned based on if item.rain has the value of true or false --> <p> <ul> <li ng-repeat="item in weather"> {{item.day + " : "}} {{item.rain | raining}} </li> </ul> </p> </div> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.9/angular.min.js"></script> <script src="js/exam8.js"></script> <!-- Needed for custom Filter --> <script src="js/filters.js"></script> </body> </html> |
exam8.js
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// Register our custom filter as a dependency var app8 = angular.module('app8', ['weatherFilters']); app8.controller('mainCtrl', function($scope) { $scope.students = [ {name: "George Thomas", gpa: 3.5}, {name: "Susy Smith", gpa: 3.6}, {name: "Paul Marks", gpa: 3.2}, {name: "Sue Edgar", gpa: 3.8} ]; $scope.student = { gpas:[ {name: "George Thomas", gpa: 3.5}, {name: "Susy Smith", gpa: 3.6}, {name: "Paul Marks", gpa: 3.2}, {name: "Sue Edgar", gpa: 3.8} ] }; $scope.currDate = new Date(); $scope.randomStr = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. " $scope.randArray = [ "Tomato", "Potato", "Bread", "Pickles", "Raisins" ]; $scope.weather = [ {day: "Monday", rain: false}, {day: "Tuesday", rain: true} ]; }); |
filters.js
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// Create a module named weatherfilters // The name for the filter is raining and different unicode // characters are returned based on weather an item is true or false angular.module('weatherFilters', []).filter('raining', function(){ return function(input){ return input ? '\u2602' : '\u2600'; }; }); |
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