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Creating a pop up displaying Contact details


I have written a trigger to catch duplicates in Contacts.

In tha last step i wish to show the Contact( for whom the duplicate is caught) details that already exists in the system.

Thank You

Shashikant SharmaShashikant Sharma

I think what you are looking to show a duplicate match inline to a contact if there is any

Please explain 

1. What is your duplicate criteria only Name or Name + Email or nay other
2. What is the action trigger does once duplicate is found
Basically i am catching duplicate based on email, phone and name.
When the duplicate is caught , it is throwing an error. I am looking if the error is displayed along with the existing Contact details on a separate page.
Here's the trigger:

trigger Duplicate1 on Contact (before insert) {
    set<Id> accIds = new set<Id>();

    for(Contact p{
    map<Id,account> parentAccmap = new map<Id,account>([select Id,parentId,recordtypeId from account where Id IN :accIds and parentId!=NULL and recordtypeId='012600000005J5J']); //add Site record type Id here.

    set<ID> parentIds = new set<ID>();
    for(Account acc : parentAccmap.values()){
    map<Id,Set<String>> parentPrMap = new map<Id,Set<String>>();
    list<Contact> prParentlist = [select ID,Email,Name,AccountId, Account.recordtypeId,Phone,FirstName, lastName from Contact where AccountId IN:parentIDs and Account.recordtypeId='012600000005J5I']; //add Customer record type Id here.
    for(Contact pr:prParentlist){
        if(parentPrMap.get(pr.AccountId) == null){
            parentPrMap.put(pr.AccountId, new Set<String>());

list<Contact> prParentlist2 = [select ID,Email,Name,account.parentid, Account.recordtypeId,Phone,FirstName, lastName from Contact where account.parentid in :parentIDs and Account.recordtypeId='012600000005J5J']; //add Customer record type Id here.
    for(Contact pr:prParentlist2){
        if(parentPrMap.get(pr.account.parentid) == null){
            parentPrMap.put(pr.account.parentid, new Set<String>());
            && parentAccmap.containsKey(prr.Accountid)
            && parentPrMap.containsKey(parentAccmap.get(prr.Accountid).ParentId)
                String baseUrl = URL.getSalesforceBaseUrl().toExternalForm()+'/02Z/e?parentId=';
                string errorMsg = '<a style=\'color:1B2BE8\'href="'+baseUrl+ prr.accountid +'"> Please Create a Contact Role  </a>';
                prr.addError('This Contact already exists.'+ errorMsg,false);
Shashikant SharmaShashikant Sharma
You could fetch the details from this map => parentPrMap 

Although your duplicate finding logic could easly be reduced

1. Create a Text ( 255 ) Unique Field on contact
2. Develop a trigger or workflow to populate it with all field contributing in duplicate
    contact.Name + contact.Email + Contact.Phone

By this when another contact will be created you will see errro message with URL to existing contact.

The solution you provided will be an org wide solution. In my trigger i am catching duplicates on Account base.
Shashikant SharmaShashikant Sharma
You could do
contact.AccountId + contact.Name + contact.Email + Contact.Phone

to make it account specific .