Optimizing AngularJS Application

Sep 27, 20143 likes1,768 views

The document provides best practices for optimizing JavaScript code in AngularJS development, addressing issues like slow performance and unexpected characters. It emphasizes the importance of dependency injection, template caching, and minimizing DOM manipulations, along with guidance on using directives and promises. It also highlights resource links for further reference and encourages best coding habits to improve efficiency.

Technology

Md.
Ziaul
Haq
Sr.
JavaScript
Developer
oDesk
Inc.
@jquerygeek

¡ Identify
the
problems
¡ The
solution
with
best
practices
¡ Few
more
best
practices

¡ Network
related
issue
¡ Unexpected
characters
¡ Slow
DOM
¡ Slow
watcher

¡ Write
minify
safe
code
§ Use
Dependency
Annotation

¡ Without
Dependency
Annotation
myApp.service(’myService’,
function($http){
console.log($http);
});

¡ Without
Dependency
Annotation
myApp.service("myService",
function(a){
console.log(a)
});

¡ With
Dependency
Annotation
myApp.service(’myService’,
[‘$http’, function($http){
console.log($http);
}]);

¡ Use
‘ng-‐annotate’
§ https://github.com/olov/ng-‐annotate

¡ Lot
of
network
request
§ Mostly
for
template
files

¡ Cache
the
templates
§ Use
$templateCache
service

myApp.run([‘$templateCache’,
function($templateCache) {
$templateCache.put('tpls/
hello.html', '<div class='hello
'>Hello, {{world}}!</div>’);
}]);

¡ For
grunt
§ https://github.com/karlgoldstein/grunt-‐html2js
¡ For
gulp
§ https://github.com/fraserxu/gulp-‐html2js

— Hide
the
body/some
element,
till
bootstrap
angular
— Use
ng-‐cloak

<Style>
[ng-cloak] {
display: none;
}
</style>
<body ng-cloak>

▪ Hide
individual
expressions
▪ Use
ng-‐bind
<span ng-bind=”data.value”>
</span>

¡ https://builtwith.angularjs.org/

¡ Optimize
ng-‐repeat
§ Use
the
track
by
syntax
<li ng-repeat=”
item in data.items
track by item.id ”>
</li>

¡ Use
bind-‐once
<li ng-repeat=”
item in ::data.items">
{{::item.title}}
</li>

¡ Filter
in
controller,
not
in
‘ng-‐repeat’

¡ Do
you
need
$watch?
¡ Use
unWatch
¡ Keep
$watch
smaller
and
focused
¡ Avoid
loop
in
$watch

¡ Avoid
deep
comparison
$scope.user = {
id: grrey,
name: Gandaf Grey,
email: ggreay@gmail.com
}
$scope.$watch('user', function(newUser) {
//...
}, true);

¡ Keep
filter
simple
with
single
task
¡ Use
bind-‐once
¡ Keep
less
item
in
ng-‐repeat

¡ Bootstrap
Angular
app
§ Angular-‐seed
https://github.com/angular/angular-‐seed
§ Angular-‐fun
https://github.com/CaryLandholt/
AngularFun

¡ Separate
the
business
logic
§ Controller
▪ Manipulate
DOM
in
Controller
Directives
▪ Commonly
used
functions
as
service.
▪ Use
$emit,
$broadcast
or
$on
to
communicate
with
other
controller.

¡ Separate
the
business
logic
§ Service
▪ Should
not
refer
DOM
▪ All
business
login
in
service

§ Directive
▪ DOM
manipulations
must
in
directives
▪ Use
scope
instead
of
$scope
in
link
▪ Isolated
scope
for
reusable
components.
▪ Custom
prefix
to
avoid
conflict
▪ Don’t
use
‘ng’
and
‘ui’
as
prefix.

§ Use
of
Directive
▪ Use
‘data’
prefix
for
valid
HTML
"
<div data-my-directive>
</div>

¡ Choose
the
better
one
§ Use
promises
($q)
instead
of
old
callbacks.
§ Use
ngIf
instead
of
ngShow
&
ngHide

¡ Choose
the
better
one
§ Use
ng-‐src
instead
of
src=“{{
}}”
§ Use
ng-‐href
instead
of
href=“{{
}}”

¡ Avoid
old/jQuery
habit
§ $timeout
instead
of
setTimeout
§ $interval
instead
of
setInterval
§ $window
instead
of
window
§ $document
instead
of
document
§ $http
instead
of
$.ajax

¡ https://docs.angularjs.org/
¡ https://github.com/mgechev/angularjs-‐style-‐
guide
¡ ng-‐book

Thanks,
all.
J
Drop
me
a
line
if
more
question
jquerygeek@elance-‐odesk.com

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Optimizing AngularJS Application

2. Md. Ziaul Haq Sr. JavaScript Developer oDesk Inc. @jquerygeek

3. ¡ What && Why

4. ¡ Identify the problems ¡ The solution with best practices ¡ Few more best practices

7. ¡ Network related issue ¡ Unexpected characters ¡ Slow DOM ¡ Slow watcher

8. ¡ Minify your codes § Use Uglify

10. ¡ Write minify safe code § Use Dependency Annotation

11. ¡ Without Dependency Annotation myApp.service(’myService’, function($http){ console.log($http); });

12. ¡ Without Dependency Annotation myApp.service("myService", function(a){ console.log(a) });

13. ¡ With Dependency Annotation myApp.service(’myService’, [‘$http’, function($http){ console.log($http); }]);

14. ¡ Use ‘ng-‐annotate’ § https://github.com/olov/ng-‐annotate

15. ¡ Lot of network request § Mostly for template files

16. ¡ Cache the templates § Use $templateCache service

17. myApp.run([‘$templateCache’, function($templateCache) { $templateCache.put('tpls/ hello.html', '<div class='hello '>Hello, {{world}}!</div>’); }]);

18. ¡ For grunt § https://github.com/karlgoldstein/grunt-‐html2js ¡ For gulp § https://github.com/fraserxu/gulp-‐html2js

20. ¡ Template tag {{ }} in landing page

21. — Hide the body/some element, till bootstrap angular — Use ng-‐cloak

22. <Style> [ng-cloak] { display: none; } </style> <body ng-cloak>

23. ▪ Hide individual expressions ▪ Use ng-‐bind <span ng-bind=”data.value”> </span>

24. ¡ https://builtwith.angularjs.org/

25. ¡ Repeating manipulation

26. ¡ Optimize ng-‐repeat § Use the track by syntax <li ng-repeat=” item in data.items track by item.id ”> </li>

27. ¡ Use bind-‐once <li ng-repeat=” item in ::data.items"> {{::item.title}} </li>

28. ¡ Filter in controller, not in ‘ng-‐repeat’

30. ¡ Do you need $watch? ¡ Use unWatch ¡ Keep $watch smaller and focused ¡ Avoid loop in $watch

31. ¡ Avoid deep comparison $scope.user = { id: grrey, name: Gandaf Grey, email: [email protected] } $scope.$watch('user', function(newUser) { //... }, true);

32. ¡ Keep filter simple with single task ¡ Use bind-‐once ¡ Keep less item in ng-‐repeat

35. ¡ Bootstrap Angular app § Angular-‐seed https://github.com/angular/angular-‐seed § Angular-‐fun https://github.com/CaryLandholt/ AngularFun

36. ¡ Separate the business logic § Controller ▪ Manipulate DOM in Controller Directives ▪ Commonly used functions as service. ▪ Use $emit, $broadcast or $on to communicate with other controller.

37. ¡ Separate the business logic § Service ▪ Should not refer DOM ▪ All business login in service

38. § Directive ▪ DOM manipulations must in directives ▪ Use scope instead of $scope in link ▪ Isolated scope for reusable components. ▪ Custom prefix to avoid conflict ▪ Don’t use ‘ng’ and ‘ui’ as prefix.

39. § Use of Directive ▪ Use ‘data’ prefix for valid HTML " <div data-my-directive> </div>

40. ¡ Choose the better one § Use promises ($q) instead of old callbacks. § Use ngIf instead of ngShow & ngHide

41. ¡ Choose the better one § Use ng-‐src instead of src=“{{ }}” § Use ng-‐href instead of href=“{{ }}”

42. ¡ Avoid old/jQuery habit § $timeout instead of setTimeout § $interval instead of setInterval § $window instead of window § $document instead of document § $http instead of $.ajax

43. ¡ https://docs.angularjs.org/ ¡ https://github.com/mgechev/angularjs-‐style-‐ guide ¡ ng-‐book

45. Thanks, all. J Drop me a line if more question jquerygeek@elance-‐odesk.com

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