Previous And Next Email Message Buttons in Lightning

If you are using Service cloud and have Email-to-Case functionality implemented, then this blog is useful for you.

In Lightning, Salesforce didn't provide standard functionality of Previous and Next actions on Email Message Objects which exist in Salesforce Classic version.

Lets take scenario, there is complaint case from user which is raised 10 days back and your servicing Team leader want to check all email history of that case.

This is common scenario happens in every organizations. If Team Leader is in Classic he can check all email history using Previous and Next buttons shown below.

But what about Lightning ???
There is no such standard functionality in Lightning, MUCH NEEDED !!

I have implemented workaround for this using Customization's.
Copy and paste below codes.

1. Create Apex Class: EmailMessageActions 

public class EmailMessageActions {
    public Id prevId {get;set;}
    public Id nextId {get;set;}
    public Id caseId {get;set;}
    public Boolean isLex {get;set;}
    public String prevURL {get;set;}
    public String nextURL {get;set;}
    public String emailMsgListURL {get;set;}
    public EmailMessage eMsg;
    public String statusMsg {get;set;}
    
    public EmailMessageActions(ApexPages.StandardController stdController) {        
        this.eMsg = (EmailMessage)stdController.getRecord();
        statusMsg = null;
        getPreviousNextEMsgIds();
    }
    
    public PageReference previousMsg(){
        //statusMsg = 'Loading...';
        System.debug('In previousMsg');
        if(prevId!=null){
            PageReference page = new PageReference(prevURL);
            page.setRedirect(true);
            return page;
        }
        else
            statusMsg = 'No More Previous Emails.';
        return null;
    }
    public PageReference nextMsg(){
        System.debug('In nextMsg');
        if(nextId!=null){
            PageReference page = new PageReference(nextURL);
            page.setRedirect(true);
            return page;
        }
        else
            statusMsg = 'No More Next Emails.';
        return null;
    }
    public PageReference emailMsgList(){
        System.debug('In emailMsgList');
        PageReference page = new PageReference(emailMsgListURL);
        page.setRedirect(true);
        return page;
    }
    public void getPreviousNextEMsgIds() {
        System.debug('eMsg--'+eMsg.Id);
        for(EmailMessage obj: [SELECT ParentId FROM EmailMessage WHERE Id =:eMsg.Id])
            caseId = obj.ParentId;
        System.debug('caseId--'+caseId);
        List<Id> lstId = new List<Id>();
        for(EmailMessage obj: [SELECT Id FROM EmailMessage WHERE ParentId =:caseId ORDER BY MessageDate ASC])
            lstId.add(obj.Id);
        System.debug('lstId--'+lstId);
        Integer result = lstId.indexOf(String.valueOf(eMsg.Id));
        System.debug('result--'+result);
        if(result > 0){
            prevId = lstId.get(result-1);
            if(result < lstId.size()-1)
                nextId = lstId.get(result+1);
        }
        else if(result == 0 && lstId.size() > 1)
            nextId = lstId.get(result+1);
        
        String uiThemeDisplayed = UserInfo.getUiThemeDisplayed();
        if(uiThemeDisplayed.equalsIgnoreCase('Theme4d'))
            isLex = true;
        else 
            isLex = false;
        System.debug('isLex--'+isLex);
        String sfdcBaseURL = URL.getSalesforceBaseUrl().toExternalForm();
        if(isLex){
            if(prevId!=null)
                prevURL = sfdcBaseURL+'/lightning/r/EmailMessage/'+prevId+'/view';
            if(nextId!=null)
                nextURL = sfdcBaseURL+'/lightning/r/EmailMessage/'+nextId+'/view';
            emailMsgListURL = sfdcBaseURL+'/lightning/r/'+caseId+'/related/EmailMessages/view';
        }
        else{
            if(prevId!=null)
                prevURL = sfdcBaseURL+'/'+prevId;
            if(nextId!=null)
                nextURL = sfdcBaseURL+'/'+nextId;
            emailMsgListURL = sfdcBaseURL+'/ui/email/EmailMessageListPage?id='+caseId;
        }
        System.debug('prevURL--'+prevURL);
    }
}

2. Create VisualForce Pages: PreviousEmailMessage

 <apex:page standardController="EmailMessage" extensions="EmailMessageActions" action="{!previousMsg}" showHeader="false" showQuickActionVfHeader="false">
  <h1 style="font-size:1.125rem;">{!statusMsg}</h1>
  <base target="_parent" />
 </apex:page>

3. Create VisualForce Pages: NextEmailMessage

 <apex:page standardController="EmailMessage" extensions="EmailMessageActions" action="{!nextMsg}" showHeader="false" showQuickActionVfHeader="false">
  <h1 style="font-size:1.125rem;">{!statusMsg}</h1>
  <base target="_parent" />
 </apex:page>

4. Create VisualForce Pages: EmailMessageList

 <apex:page standardController="EmailMessage" extensions="EmailMessageActions" action="{!emailMsgList}" showHeader="false" showQuickActionVfHeader="false">
  <base target="_parent" />
 </apex:page>

5. Create 3 Action Buttons for Email Message Object like Below

6. Give Profile Permissions to above Apex Class and VisualForce Pages.

7. Add these actions into Email Message Lightning Page Layout.

Thats It.

Enjoy! If you have any questions, comments etc. please feel free to let me know. As always, please feel free to get in touch me as I would be more than happy to assist you with any of your Salesforce development needs.

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