Case Details Javascript Custom Button - Take Ownership

Question

I have a custom button called "Take Case" on the Case object. The "Take Case" button is used when a specific case is assigned to a queue and a member within that queue presses the button to take ownership of the case. How can I throw an error that says "You cannot take this case because you are not part of the queue" if someone outside of the queue presses the "Take Case" button?

This is what I have so far:

{!REQUIRESCRIPT("/soap/ajax/24.0/connection.js")} 

var caseObj = new sforce.SObject("Case"); 
caseObj.Id = '{!Case.Id}'; 
caseObj.OwnerId = '{!$User.Id}'; 
caseObj.Status = 'Working';
caseObj.Assign_to_Queue__c = 'False'; 
var result = sforce.connection.update([caseObj]); 

if (result[0].success=='false') { 
alert(result[0].errors.message); 
} else { 
location.reload(true); 
}

Answer 1

You have to build the logic like this.

1. Find Previous owner and Current Owner
2. Verify if previous owner is a 'Queue'
3. If point 2 satisfies then find the current user is part of that queue.
4. If point 3 satisfies then allow update the ownership, otherwise throw the error message.
5. Also, wise to check, if current and previous owner are not same.

{!REQUIRESCRIPT("/soap/ajax/31.0/connection.js")} 
var caseObj = new sforce.SObject("Case"); 
var previousOwner = "{!Case.OwnerId}"; 
var currentOwner = "{!$User.Id}"; 
caseObj.Id = "{!Case.Id}"; 
caseObj.OwnerId = "{!$User.Id}"; 
caseObj.Status = 'Working';

//if previousOwner is queue 
var ownerRec = sforce.connection.query("SELECT owner.type, ownerid, Id from Case where owner.type= 'Queue' AND OwnerId='"+ previousOwner + "' AND Id='" + caseObj.Id + "'"); 
var records1 = ownerRec.getArray('records');
if(records1 !=null && records1.length>0)
{   
    //currentOwner is part of queue
    var currentOwnerRec = sforce.connection.query("SELECT g.UserOrGroupId From GroupMember g WHERE groupId ='" + previousOwner + "' AND g.UserOrGroupId ='" + currentOwner + "'");
    var records2 = currentOwnerRec.getArray('records');

    if(records2 !=null && records2.length>0)
    {
        var result = sforce.connection.update([caseObj]);   
        location.reload();  
    }
    else
    {
        alert("You cannot take this case because you are not part of the queue");
    }
}
if(previousOwner == currentOwner) 
{   
    alert("You are already the Case Owner ");   
}