Javascript Remoting for APEX controller

Javascript Remoting for APEX controller

Javascript remoting is the process that provides support for some methods in APEX controllers to be called via Javascript.The @RemoteAction annotation is currently available as a Developer preview.You have to contact Salesforce.com support to enable this feature.To use Javascript remoting, your request must take the following form:

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1. [<namespace>.]<controller>.<method>([params...,] <callbackFunction>(result, event)  
2. {  
3. // callback function logic  
4. }, {escape:true});  

• namespace is your organization's namespace. This is only required if the class comes from an installed packaged.

• controller is the name of your Apex controller

• method is the name of the Apex method you're calling

• params is the comma–separated list of parameters that your method takes

• callbackFunction is the name of the function that handles the response from the controller. It returns the status of the call and the method result.

• escape defines whether your response should be escaped (by default, true) or not (false)

In controller, your Apex method declaration is preceded with the @RemoteAction annotation like this:

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1. @RemoteAction  
2. global static String getItemId(String objectName) { ... }  

Example code:

/*VF page*/

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1. <script type="text/javascript">  
2. function updateStatus(input,id) {  
3. var inputStatus=id;  
4. shortList.doShortListThroughCheck(inputStatus,function(result,event){  
5. if(input.checked){  
6.  document.getElementById(id).value="Short Listed";  
7. alert(document.getElementById(id).value);  
8. }else{  
9.  document.getElementById(id).value="New";  
10.  alert(document.getElementById(id).value);  
11. }  
12. },{escape:true});  
13. }</script>  

/*@VF Component*/

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1. <apex:selectCheckboxes onclick="updateStatus(this,'{!app.Name}');">  
2.        </apex:selectCheckboxes>  

/*In Controller*/

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1. @RemoteAction  
2. global static Applicant__c doShortListThroughCheck(String para){  
3.     Applicant__c applicant;      
4.     try{  
5.    applicant=[select Name, Name__c, Status__c from Applicant__c where Name =:para limit 1];  
6.                  applicant.Status__c='Short Listed';       
7.            update applicant;     
8.                   
9.     }catch(DMLException e){  
10.          ApexPages.addMessages(e);  
11.          return null;     
12.     }          
13. return null;  
14. }