What is Javascript Remoting ?
This is a tool that developers can use to make an AJAX request from Visualforce page directly to an Apex Controller.Key Features of Javascript Remoting?
Asynchronous
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Load only the initial
page & Lazily load additional data.
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Speed
|
This is the fastest way of calling controller code.
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No Forms
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It will not post the
form, So not keeping view state which improves the performance, On button
click it will not load the whole page / no partial rendering. Only perform
the action.
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No SOQL Governor
Limit
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Javascript remoting calls don't count against SOQL Governor
limit.
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Responsive
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It provides more responsive experience in both Mobile
pages and web pages.
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When to use Javascript Remoting?
Javascript Remoting can provide an efficient,responsive,and optimized user experience.This is useful more in Mobile Web Development.
Limitations of Javascript Remoting ?
1. Since there is no forms and no view state maintained need
to manage the state of page by self on the client side. Which may takes more
development efforts.
2. Parameters need's to pass to the controller, It will take
more maintenance in case
of additional fields to the form.
3. All the validations need
to be written.
4. Error handling must be
incorporated into both page and the controller.
5. The response of the server is
limited to a maximum of 15 Mb.
6. The response of the remote call must return maximum in 120 seconds.
7. As the response of the
asynchronous server, conflicts or unexpected behaviors can occur, although very
rarely.
Javascript Remoting VS ActionFunction ?
Both will be used in different scenario's.
Javascript Remoting
|
Action Function
|
Performance much faster. No posting forms
on request hence no view state.
|
Form will be post data on every
request and View state will be transferred to the server.
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There
is no whole page/partial section re-rendering.
|
This can
re-render the page or a specific section of the page to update it with new
values from the controller instance.
|
Call back
is available
|
No call
back
|
Implementation
is trickier.
|
Implementation
is straight forward.
|
Note :
Any scenario where you don’t want to refresh
the page/no partial page rendering and just want to perform an action.Then go for Javascript Remoting else Action Function can be used.
Visualforce
Remote Objects VS Javascript Remoting ?
Visualforce
Remote Objects VS Javascript Remoting ?
Visualforce Remote Object
|
Javascript Remoting
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The
benefit of Remote Objects is that you can access server data without using
API calls or writing Apex Code.
|
JavaScript Remoting needs Apex Code
with the method @RemoteAction annotation
|
It's
slower than the AJAX toolkit and the RemoteAction annotation.
|
This is the fastest way of calling controller code.
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Currently
creation of multiple records is not possible.
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Creation
of multiple records is possible.
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The CRUD/FLS is automatically taken care
in case of Remote Objects.
|
In apex
you will need to write extra code to respect CRUD/FLS
|
Makes
basic “CRUD” object access easy
|
It
requires Javascript and Apex code
|
Supports
minimal server-side application logic
|
Supports
complex server-side application logic
|
Doesn’t
provide automatic relationship traversals; you must look up related objects
yourself
|
Handles
complex object relationships better
|
Test
Class is not required, as no Controller is involved.
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Test
Class is required, as Controller is involved.
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Drawback of Visualforce Remote Object ?
The name space is hard coded in the mark-up.
