Optimizing Angular Performance in Enterprise Single Page AppsMorgan Stone
Getting the most out of Angular 1.x in enterprise apps
Originally presented at the Birmingham Javascript Meetup on June 2, 2016
http://www.meetup.com/bhm-js/
Is your web app drowning in a sea of JavaScript? Has your client-side codebase grown from "a snippet here and there" to "more JavaScript than HTML"? Do you find yourself writing one-off snippets instead of generalized components? You're not the only one. Learn about a handful of strategies you can use to keep your JavaScript codebase lean, modular, and flexible. We'll cover all the major pain points — MVC, templates, persisting state, namespacing, graceful error handling, client/server communication, and separation of concerns. And we'll cover how to do all this incrementally so that you don't have to redo everything from scratch.
Optimizing Angular Performance in Enterprise Single Page AppsMorgan Stone
Getting the most out of Angular 1.x in enterprise apps
Originally presented at the Birmingham Javascript Meetup on June 2, 2016
http://www.meetup.com/bhm-js/
Is your web app drowning in a sea of JavaScript? Has your client-side codebase grown from "a snippet here and there" to "more JavaScript than HTML"? Do you find yourself writing one-off snippets instead of generalized components? You're not the only one. Learn about a handful of strategies you can use to keep your JavaScript codebase lean, modular, and flexible. We'll cover all the major pain points — MVC, templates, persisting state, namespacing, graceful error handling, client/server communication, and separation of concerns. And we'll cover how to do all this incrementally so that you don't have to redo everything from scratch.
Having trouble getting selenium WebDriver to do what you want? Want to put together a Swiss Army library for WebDriver? Thinking about creating your own framework? This presentation will show you some of the most common functions you can do in WebDriver. These functions come from my current automation framework, my automation experience, and from common trends on the WebDriver Google group.
s React.js a library or a framework? In any case, it is a new way of working that represents a revolution in the way of building web projects. It has very particular characteristics that allow us, for instance, to render React code from the server side, or to include React components from Twig tags. During this talk we will present React.js, we will explore how to take advantage of it from PHP projects and we will give answers to practical problems such as universal (isomorphical) rendering and the generation of React.js forms from Symfony forms without duplication of efforts.
A presentation made for the NG-CONF Israel that took place in jun 2014 at Google TLV Campus (http://ng-conf.gdg.co.il/)
its an overview of how to use ngRoute and UI-Router in your app this slideshow contain a link for a working demo
Having trouble getting selenium WebDriver to do what you want? Want to put together a Swiss Army library for WebDriver? Thinking about creating your own framework? This presentation will show you some of the most common functions you can do in WebDriver. These functions come from my current automation framework, my automation experience, and from common trends on the WebDriver Google group.
s React.js a library or a framework? In any case, it is a new way of working that represents a revolution in the way of building web projects. It has very particular characteristics that allow us, for instance, to render React code from the server side, or to include React components from Twig tags. During this talk we will present React.js, we will explore how to take advantage of it from PHP projects and we will give answers to practical problems such as universal (isomorphical) rendering and the generation of React.js forms from Symfony forms without duplication of efforts.
A presentation made for the NG-CONF Israel that took place in jun 2014 at Google TLV Campus (http://ng-conf.gdg.co.il/)
its an overview of how to use ngRoute and UI-Router in your app this slideshow contain a link for a working demo
We the humans are surrounded with immense unprecedented wealth of information which are available as documents, database or other resources. The access to this information is difficult as by having the information it is not necessary that it could be searched or extracted by the activity we are using. The search engines available should be also customized to handle such queries, sometime the search engines are also not aware of the information they have within the system. The method known as keyword extraction and clustering is introduced which answers this shortcoming by spontaneously recommending documents that are related to users’ current activities. When the communication takes place the important text can be extracted from the conversation and the words extracted are grouped and then are matched with the parts in the document. This method uses Natural Language Processing for extracting of keywords and making the subgroup that is a meaningful statement from the group, another method used is the Hierarchical Clustering for creating clusters form the keywords, here the similarity of two keywords is measured using the Euclidean distance. This paper reviews the various methods for the system.
When you move beyond adding simple enhancements to your website with jQuery and start building full-blown client-side applications, how do you organize your code? At this month's Triangle JS Meetup, we'll take a look at patterns for application development using jQuery that promote the principles of tight encapsulation and loose coupling, including classes, the publish/subscribe paradigm, and dependency management and build systems.
Good karma: UX Patterns and Unit Testing in Angular with KarmaExoLeaders.com
If you listen to backend developers, they will tell you that writing unit tests is essential to good karma. Pay it forward with tests and get back a reliable application. But getting unit tests running on the front end in a “real” application can be a lot more challenging. This intermediate-beginner level workshop will cover how to get setup for writing unit tests, and how to write front-end and end-to-end oriented unit tests for a variety of use cases all for AngularJS. We will work from a series of use cases, transform those into formal acceptance tests, write failing unit tests and then resolve those tests writing code with Angular, html/jade/css and node.
Presentation by Laura Ferguson and Boris Kan @ Create, inc, 2015
Building an End-to-End AngularJS ApplicationDan Wahlin
This talk discusses how AngularJS can be used to build an end-to-end Customer Manager application. It covers structuring code and files, working with events, XHR interceptors, plus more.
Refactoring can either completely disrupt your project or make you go faster. This presentation will help you to avoid some pitfalls.
It also demonstrates refactorings that you could apply straight away to make your code better.
Ten useful JavaScript tips & best practicesAnkit Rastogi
In this presentation there are ten useful JavaScript techniques which can be included in your application easily with less friction along with some AngularJs tips and best practices as a bonus. These tips and best practices are accompanied by examples & will cover script loading, design pattern, performance optimization and other areas.
Since best practices are very subjective topics, proper benchmarking needs to be done.
Promises are a popular pattern for asynchronous operations in JavaScript, existing in some form in every client-side framework in widespread use today. We'll give a conceptual and practical intro to promises in general, before moving on to talking about how they fit into Angular. If you've ever wondered what exactly $q was about, this is the place to learn!
The Return of JavaScript: 3 Open-Source Projects that are driving JavaScript'...Ben Teese
Web development is experiencing a major change at the moment. Users are demanding increasingly responsive and interactive web applications. The mobile web has taken off. And closed platforms like Flash are yielding to open standards like HTML 5.
In this presentation I’ll argue that the language that will underpin this revolution is JavaScript – despite it’s poor reputation. Furthermore, I’ll explain how JavaScript’s resurrection is being driven by a slew of new open-source technologies.
For video of this presentation, see http://www.youtube.com/watch?v=SiCD3Nbf810
Why do we need promises? How does promises compare to a simple callback approach or modules like async? Are promises just a hype or a new standard for asynchronous code?
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
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3. Apply/Digest Cycle
$digest:
$digest processes all the watch-Expressions for the current scope and its children
What happens when a watch-Expression is processed?
The value of the current watch-Expression is compared with the value of the previous
watch-Expression, and if they do not match then it is “dirty” and a listener is fired.
This is what we call as “Dirty Checking”.
Angular doesn’t directly call $digest(). Instead, it calls $scope.$apply(), which in turn calls
$rootScope.$digest(). As a result of this, a digest cycle starts at the $rootScope, and
subsequently visits all the child scopes calling the watchers along the way.
4. Now, let’s assume you attach an ng-click directive to a button and pass a function name to
it. When the button is clicked, AngularJS wraps the function call within $scope.$apply(). So,
your function executes as usual, change models (if any), and a $digest cycle starts to
ensure your changes are reflected in the view.
When & why should I call apply() manually ?
When an external event (such as a user action, timer or XHR) is received, the associated
expression must be applied to the scope through the $apply() method so that all listeners
are updated correctly.
It will account for only those model changes which are done inside AngularJS’ context (i.e.
the code that changes models is wrapped inside $apply()). Angular’s built-in directives
already do this so that any model changes you make are reflected in the view. However, if
you change any model outside of the Angular context, then you need to inform Angular of
the changes by calling $apply() manually. It’s like telling Angular that you are changing
some models and it should fire the watchers so that your changes propagate properly.
For example, if you use JavaScript’s setTimeout() function to update a scope model,
Angular has no way of knowing what you might change. In this case it’s your responsibility
to call $apply() manually, which triggers a $digest cycle. Similarly, if you have a directive
that sets up a DOM event listener and changes some models inside the handler function,
you need to call $apply() to ensure the changes take effect
5. Example
If you use JavaScript’s setTimeout() function to update a scope model, Angular has no way of
knowing what you might change. In this case it’s your responsibility to call $apply() manually,
which triggers a $digest cycle.
HTML
<body ng-app="myApp">
<div ng-controller="MessageController"> Delayed Message: {{message}} </div>
</body>
JS /*Without Apply*/
angular.module('myApp',[]).controller('MessageController', function($scope) {
$scope.getMessage = function() {
setTimeout(function() {
$scope.message = 'Fetched after 3 seconds';
}, 2000);
$scope.getMessage();
}
JS /*With Apply*/
angular.module('myApp',[]).controller('MessageController', function($scope) {
$scope.getMessage = function() {
setTimeout(function() {
$scope.$apply(function() {
$scope.message = 'Fetched after 3 seconds';
});
}, 2000);
}
$scope.getMessage();
});
6. Handling Memory
$destroy()
Removes the current scope (and all of its children) from the parent scope. Removal implies
that calls to $digest() will no longer propagate to the current scope and its children. Removal
also implies that the current scope is eligible for garbage collection.
The $destroy() is usually used by directives such as ngRepeat for managing the unrolling of
the loop.
Just before a scope is destroyed a $destroy event is broadcasted on this scope. Application
code can register a $destroy event handler that will give it chance to perform any necessary
clean-up.
Scope.$destroy();
Calling $destroy() on a scope causes an event “$destroy” to flow downstream.
7. Why & when should I manually handle memory ?
If you are using timers to update scope.
In cases where you have event listeners.
As an example, the following controller continuously updates a model value in one second intervals, and these updates
will continue forever, even after the controller’s view is gone and the scope is removed from its parent.
module.controller("TestController", function($scope, $timeout) {
var onTimeout = function() {
$scope.value += 1;
$timeout(onTimeout, 1000);
};
$timeout(onTimeout, 1000);
$scope.value = 0;
});
Listening for the $destroy event is an opportunity to halt the timer
module.controller("TestController", function($scope, $timeout) {
var onTimeout = function() {
$scope.value += 1;
timer = $timeout(onTimeout, 1000);
};
var timer = $timeout(onTimeout, 1000);
$scope.value = 0;
$scope.$on("$destroy", function() {
if (timer) {
$timeout.cancel(timer);
}
});
});
8. Promises
The AngularJS $q service is said to be inspired by Chris Kowal's Q library
(github.com/kriskowal/q). The library's goal is to allow users to monitor asynchronous
progress by providing a "promise" as a return from a call. In AngularJS, the semantics of
using a promise are:
var promise = callThatRunsInBackground();
promise.then(
function(answer) {
// do something
},
function(error) {
// report something
},
function(progress) {
// report progress
});
9. A number of Angular services return promises: $http, $interval, $timeout, for example. All
promise returns are single objects; you're expected to research the service itself to find out
what it returns. For example, for $http.get, the promise returns an object with four
keys:data, status, headers, and config. Those are the same as the four parameters fed to the
success callback if you use those semantics:
// this
$http.get('/api/v1/movies/avengers')
.success(function(data, status, headers, config) {
$scope.movieContent = data;
});
// is the same as
var promise = $http.get('/api/v1/movies/avengers');
promise.then(
function(payload) {
$scope.movieContent = payload.data;
});
10. Deferring Promises, Defining Custom Promises:
function asyncGreet(name) {
var deferred = $q.defer();
setTimeout(function() {
deferred.notify('About to greet ' + name + '.');
if (okToGreet(name)) {
deferred.resolve('Hello, ' + name + '!');
} else {
deferred.reject('Greeting ' + name + ' is not allowed.');
}
}, 1000);
return deferred.promise;
}
var promise = asyncGreet('Robin Hood');
promise.then(function(greeting) {
alert('Success: ' + greeting);
}, function(reason) {
alert('Failed: ' + reason);
}, function(update) {
alert('Got notification: ' + update);
});
11. Chaining Promises
defer.promise
.then(function () {
alert("I promised I would show up");
})
.then(function () {
alert("me too");
})
.then(function () {
alert("and I");
});
defer.resolve();
It is also possible to resolve with parameters. The chained promises will cascade their return values to the
subsequent promise:
defer.promise
.then(function (weapon) {
alert("You can have my " + weapon);
return "bow";
})
.then(function (weapon) {
alert("And my " + weapon);
return "axe";
})
.then(function () {
alert("And my " + weapon);
});
defer.resolve("sword");
12. Transclusion
Transclusion provides a way for a consumer of a directive to define a template that is
imported into the directive and displayed. For example you might have a directive that
outputs a table while allowing the consumer of the directive to control how the table rows
are rendered. Or, you might have a directive that outputs an error message while allowing
the consumer of the directive to supply HTML content that handles rendering the error
using different colors. By supporting this type of functionality the consumer of the directive
has more control over how specific parts of the HTML generated by the directive are
rendered.
Two key features are provided by AngularJS to support transclusion. The first is a property
that is used in directives named transclude. When a directive supports transclusion this
property is set to true. The second is a directive named ng-transclude that is used to define
where external content will be placed in a directive’s template
13. Markup
<div ng-app="phoneApp">
<div ng-controller="AppCtrl">
<panel>
<div class="button">Click me!</div>
</panel>
</div>
</div>
var app = angular.module('phoneApp', []);
app.controller("AppCtrl", function ($scope) {
});
app.directive("panel", function () {
return {
restrict: "E",
template: '<div class="panel">This is a panel component</div>'
}
});
return {
restruct: "E",
transclude: true,
template: '<div class="panel" ng-transclude>This is a panel component </div>'
}
14. Watch
The $scope.watch() function creates a watch of some variable. When you register a watch you pass two functions
as parameters to the $watch() function:
A value function
A listener function
Here is an example:
$scope.$watch(function() {},
function() {}
);
The first function is the value function and the second function is the listener function.
The value function should return the value which is being watched. AngularJS can then check the value returned
against the value the watch function returned the last time. That way AngularJS can determine if the value has
changed. Here is an example:
$scope.$watch(function(scope) { return scope.data.myVar },
function() {}
);
This example value function returns the $scope variable scope.data.myVar. If the value of this variable changes, a
different value will be returned, and AngularJS will call the listener function.
15. The watchExpression is called on every call to $digest() and should return the value that will
be watched. (Since $digest() reruns when it detects changes the watchExpression can execute
multiple times per $digest() and should be idempotent.)
The listener is called only when the value from the current watchExpression and the previous
call to watchExpression are not equal (with the exception of the initial run, see below).
Inequality is determined according to reference inequality, strict comparison via the !==
Javascript operator, unless objectEquality == true (see next point)
When objectEquality == true, inequality of the watchExpression is determined according to
the angular.equals function. To save the value of the object for later comparison, the
angular.copy function is used. This therefore means that watching complex objects will have
adverse memory and performance implications.
The watch listener may change the model, which may trigger other listeners to fire. This is
achieved by rerunning the watchers until no changes are detected. The rerun iteration limit is
10 to prevent an infinite loop deadlock.