wlp with ajax_webinar

7/31/2019 WLP With Ajax_webinar

1/14

Desktop AJAXChris Jolley, Robert Bergman1/12/2007


2/14

Ajax

Asynchronous Javascript And XML

Acronym coined by Jesse James Garret, Adaptive Path

Widespread use triggered by Googles online applications: gmail, maps..

Widespread use also triggered by more powerful browsers and client

computers

Zero-footprint rich user interface, still a web page


3/14


4/14

Enabling These Features

AsyncContent on portlet

Attribute on

Crack open the .portlet file or IDE

AsyncMode on the Desktop

Attribute on the

Crack open .portal file of IDE

Enable via the admin tools


5/14

Enable from the Admin tools


6/14

What are the benefits

The idea is to only send back the content that has changed.

Reduce/eliminate page reloads

Increase speed/responsiveness

Enhance usability

Make applications more interactive

No modifications to existing applications

Working with standards


7/14

PortalServletHttp

text/html

Browser

FirstRequest

DOM

ajax.js PortalServletXHR

JSON

subsequen

t

Desktop asyncMode=enabled


8/14

DOM

async.js PortalServletXHR/iframe

html

http

PortalServlet

DOM

async.js PortalServletXHR/iframe

html

html

Browser

N+

1

Portlet asyncContent=[ajax|iframe]


9/14

When to use which

Both give quicker response times

Portlet AsyncConent

Enable for just that portlet (maybe portal does not work with entire

desktop enabled)

Long Running Portlets dont want to hold up entire pageN + 1 requests

Desktop AsyncMode

Inter portlet communication

Need context information (eg. PageBackingContext)Newer Web sites

1 request


10/14

First request, links wrapped in tag, Browser Refresh, Redirects,

Page change links

Http Request

text/html

Subsequent requests

XHR Request

application/json

ajax.js


11/14

What works/doesnt

WSRP

Threading

Cache

IPC

All Portlet Types

Nested Books

Redirects

Look and Feel Changes

Tree Optimization

Customizations

Themes

Portlet States/Modes

XHTML

While the goal is to just enable this feature and haveeverything work as before, only quicker. Reality

Do Work


12/14

Limitations and

May never Work

Portlets that expect to be refreshed without any interaction

Developer can call new methodPortletBackingContext.setRenderOnAjaxRequest(boolean);

Some javascript page events: onload(), onunload(), onbeforeunload()

Next release mimic these events

Delete button with old style look and feels

Disable

Adds request param _portlet.async=false

DesktopBackingContext.setAsyncMode(String mode);


13/14

Working With Other AJAX frameworks

Challenges

Some frameworks tend to want to own the entire page does not workwell with portals or mashups.

Multiple instances of a portlet on the same page

Namespacing issue

Javascript versioning issues

Synchronization of client and server.

Working through standards

JSR286, JSR301, WSRP, and the OpenAjax Alliance -- to resolve these

specific issues and to enable integrating other AJAX frameworks with

WebLogic Portal.

Recommendation

near-term, we suggest using a framework like Dojo, as this has been

used by many developers to create portlet content using AJAX.

Use WLPs additional AJAX features like drag and drop tags


14/14

Demo

wlp with ajax_webinar

Documents