In my words, Getting data from Other System or Same System using HTTP request is known as REST API.
If you know, how website works, you know REST API. Before REST API, there was SOAP request which needed lots of configuration and very tightly coupled. If you make any modification , you had to modify client side also by generating stubs / proxy classes again. There were many more disadvantages which got address by REST API. However, it doesn’t mean we don’t need SOAP.
Back to REST API, It is very simple to setup and almost any programming language can make HTTP request so very easy to get data from other source. Return type of REST API can be XML, Simple HTTP, JSON or any media like image. However, JSON is very popular response type amongst all.
REST API Playground : I have created Simple Visualforce page, which demonstrates how to use REST API of Salesforce. It is written in Visualforce with the help of JQuery. You can study this code and play with it in your organization, you just need to copy and paste it.
You also need to add URL “http://cdnjs.cloudflare.com” in Remote Site Settings, so that salesforce will allow Visualforce page to get JQuery library from CDN.
Recently, I ran into requirement where I was getting JSON response and needed to render it on my Mobile application. I had two Options, Server side processing and Client side Templating. I studied and checked both way ; came to conclusion on using Client side Templating. There are many plugins and libraries available however there is one which stands different, easy to use and faster as compared to others which is “Underscore.js“.
Underscore.js library needs JQuery as prerequisite. You can find complete documentation here, Only remember following three points :
I have created a List View Button, where I select few contacts and using JQuery, One Contact is selected Randomly. Assuming that you already know how to create List View Button, I will share my Visualforce and Controller Extension code with you.
Also, Please note that to run this demo, you need to have JQuery file in your static resource with name “JQueryAndCss”.
In this tutorial, I am going to explain very Simple AJAX and JSON based Auto Complete component with the help of JQuery UI. First I am assuming that you already have Static Resource of named “AutoCompleteWithModal“. This Static resource has all images, CSS and JQuery library needed to implement this component.
In one of my old post, I have already explained that how to generate JSON in Visualforce page. So Considering same article I have create Visualforce page named “Account_JSON” which returns list of Accounts on basis of text entered in input field.
Welcome back Readers. This is my first blog entry for year 2013, i know its too late. However i can ensure that i have lots of unique post which will come this year. I am starting this year with very light post , mimic the help-text style of Salesforce.
Most of the time when i override Visualforce page, customers many time demand for same Standard page layout.
apex:inputField and apex:outputField shows their help bubble (if applicable) when nested within a pageBlockSection component automatically.
If you want to provide your own text instead you can by utilizing the helpText attribute on pageBlockSectionItem. Also you can access the help text within an expression by using the respective $ObjectType global as such:
In Datepicker control of salesforce, most of the developers must have faced issue on year range for Datepicker control. We cannot configure the year range in standard date picker control. However, for a long time i am using a JQuery code to change the range of years in Datepicker and thought to share with you. You can find similar solution at many places but thought to add in my articles library also.
Navigate to “Set up | App SetUp | Customize | Home | Home Page Components”.
click on “New” Custom Component. In Next screen you will prompted with the type of Homepage component.
Push technology is a model of Internet-based communication in which information transfer is initiated from a server to the client. Also called the publish/subscribe model, this type of communication is the opposite of pull technology in which a request for information is made from a client to the server. The information that’s sent by the server is typically specified in advance. When using Streaming API, you specify the information the client receives by creating a PushTopic. The client then subscribes to the PushTopic channel to be notified of events that match the PushTopic criteria.
In push technology, the server pushes out information to the client after the client has subscribed to a channel of information. In order for the client to receive the information, the client must maintain a connection to the server. Streaming API uses the Bayeux protocol and CometD, so the client to server connection is maintained through long polling.
The Bayeux protocol and CometD both use long polling.
Bayeux is a protocol for transporting asynchronous messages, primarily over HTTP.
CometD is a scalable HTTP-based event routing bus that uses an AJAX push technology pattern known as Comet. It implements the Bayeux protocol.
There is nice jQuery plugin available on web which implements Bayeux protocol and CometD.
I have searched a lot for any library available for the Gantt Chart however there are very few available on the web. Even i was not able to find out the chart in “Google API”.
In this article, i will delineate creating the “Gantt Chart” using JQuery and JSON. In previous article we have seen that how to generate JSON using Salesforce. So continuing the last article, i will use the same JSON reponse to create the “Gantt Chart”.
What is Gantt Chart?
A Gantt chart is a type of bar chart, developed by Henry Gantt, that illustrates a project schedule. Gantt charts illustrate the start and finish dates of the terminal elements and summary elements of a project.
However we know that the variable name “from” and “desc” are not valid in Apex because they are keyword. so as a workaround i am replacing the placeholders after the generation of JSON in previous article.
Today i came across very known problem of jQuery and thought of sharing same with everyone. In Salesforce the element id is in the format of “j_id0:j_id3:j_id4:c_txt“. In previous post we have already discussed about getting the elementId in Visualforce.