Salesforce REST API Playground

What is REST API ?

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.

In Past, I have already written one article demonstrating REST API usage.

How to use Salesforce REST API using JQuery in Visualforce ?

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.

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Client side Templating using Underscore.js and JQuery

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 :

  1. <% %> – to execute some code
  2. <%= %> – to print some value in template
  3. <%- %> – to print some values with HTML escaped

Example Source code:

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JQuery Based Raffle in Salesforce

Author posted by Jitendra on Posted on under category Categories Salesforce, Web Technology and tagged as Tags , , , with 3 Comments on JQuery Based Raffle in Salesforce

Recently i run into very interesting scenario where i had to randomly take name of few contacts. There are many ways to do it but I thought why not to implement this functionality in Salesforce with help of some Javascript? So i came up with this – JQuery based Raffle in Salesforce.

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”.
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AutoComplete Component in Visualforce using JQueryUI

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. Continue reading “AutoComplete Component in Visualforce using JQueryUI”

Salesforce Helptext like Custom Tooltip using JQuery

Author posted by Jitendra on Posted on under category Categories HTML, Salesforce and tagged as Tags , , , with 1 Comment on Salesforce Helptext like Custom Tooltip using JQuery

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.

Salesforce like Helptext - Tooltip using JQuery
Salesforce like Helptext – Tooltip using JQuery

Download Salesforce Helptext like Tooltip using JQuery – Source Code

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: Continue reading “Salesforce Helptext like Custom Tooltip using JQuery”

Change year range in Datepicker – Salesforce

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.

Year Range in Salesforce Date Picker
Year Range in Salesforce Date Picker

So, lets start to resolve this problem. The only thing we will need is Javascript based Home page Component.
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. Continue reading “Change year range in Datepicker – Salesforce”

Streaming API Using JQuery – Salesforce

Author posted by Jitendra on Posted on under category Categories Tech Tips and tagged as Tags , with 8 Comments on Streaming API Using JQuery – Salesforce

Tutorial of Streaming API in Salesforce with Source code and Demo Video – Implementation of Bayeux protocol and CometD using JQuery and JSON

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.

  1. Bayeux is a protocol for transporting asynchronous messages, primarily over HTTP.
  2. 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.

Navigate here for Salesforce documentation for Streaming API.

Common Terms used in Streaming API:

  • Event : Either the creation of a record or the update of a record. Each event may trigger a notification.
  • Notification : A message in response to an event. The notification is sent to a channel to which one or more clients are subscribed.
  • PushTopic : A record that you create. The essential element of a PushTopic is the SOQL query. The PushTopic defines a Streaming API channel.

Example used in this article :

I want notifications about all opportunity whose status is won.
First step to implement any streaming API is to create the Push Topic, which is going to subscribed by all the clients.

Create PushTopic:

To create PushTopic, we will need the developer console of the Salesforce and assume that the name of the topic is “WonOpportunity”.

PushTopic pushTopic = new PushTopic();
pushTopic.ApiVersion = 23.0;
pushTopic.Name = 'WonOpportunity';
pushTopic.Description = 'Notify if the Opportunity won';
pushTopic.NotifyForOperations = 'All';
pushTopic.NotifyForFields = 'Referenced';
pushtopic.Query = 'Select o.OwnerId, o.Name, o.IsWon, o.Id, o.Amount From Opportunity o WHERE o.IsWon = true';
insert pushTopic;
System.debug('Created new PushTopic: '+ pushTopic.Id);
Salesforce Streaming API - Create Push topic
Salesforce Streaming API - Create Push topic

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Gantt Chart in Salesforce using JQuery and JSON

Author posted by Jitendra on Posted on under category Categories Apex, Salesforce, Visualforce and tagged as Tags , , with 38 Comments on Gantt Chart in Salesforce using JQuery and JSON

Tutorial and Example of creating the Gantt Chart in Salesforce using JQuery and JSON

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.

In this example i am going to create the Gantt Chart for room reservation system. for this i am going to use the JQuery plugin for creating Gantt Chart found here.

Plugin uses following JSON format :

[{  "name"  : "Task#1"
  , "desc"  : " Task Desc"
  , "values": [
      {  "from"       : "/Date(1296547200000)/"
       , "to"         : "/Date(1296554400000)/"
       , "desc"       : "<b>Task #1<br>"
       , "customClass": "ganttRed" (optional)
       , "label"      : "Task #1" (optional)
      },
      {  "from"       : "/Date(1296637200000)/"
       , "to"         : "/Date(1296649800000)/"
       , "desc": "<b>Task #</b>"
       , "customClass": "ganttOrange" (optional)
       , "label": "Task #1" (optional)
      }
  ]
 },
 ...
]

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. Continue reading “Gantt Chart in Salesforce using JQuery and JSON”

Handling Colon in Element ID in JQuery – Visualforce problem

Resolving the JQuery error when the Element ID contains colon with Live Demo

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.
When i tried to find the element in JQuery like $(‘#j_id0:j_id3:j_id4:c_txt’), i was getting the error on JavaScript console of the browser. After few searches, i got to know that this is known problem and faced by many of the developers.

Live Demo

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Create Simple Drag and Drop Widget like iGoogle using JQuery

Author posted by Jitendra on Posted on under category Categories HTML and tagged as Tags with 5 Comments on Create Simple Drag and Drop Widget like iGoogle using JQuery

Live Demo with source code on creating Simple Drag and Drop Widget using JQuery plugin like iGoogle

After reading this post you will come to know that how easy its to create the Drag and Drop functionality using JQuery.

To run this example you will need two javascript libraries as follow:

  1. JQuery
  2. JQueryUI
jQuery Drag and Drop Widgets
jQuery Drag and Drop Widgets

Continue reading “Create Simple Drag and Drop Widget like iGoogle using JQuery”