Custom button to open opportunity after lead is converted

I have a global class that creates an Opp from a custom lead conversion button.
The problem is that the button works to convert the lead to an Opp but it does not open the Opp. I get an error message that “that URL does not exist”.

Ideas?

global class convertLead{
    WebService static Id  convertLeadtoAcc(string id){
        Database.LeadConvert lc = new database.LeadConvert();
        lc.setLeadId(id);
        LeadStatus convertStatus = [SELECT Id, MasterLabel 
                                    FROM LeadStatus 
                                    WHERE IsConverted=true LIMIT 1];                
        lc.setConvertedStatus(convertStatus.MasterLabel);
        Database.LeadConvertResult lcr = Database.convertLead(lc);
        Id OpportunityId=[select ConvertedOpportunityId from Lead where id=:id].ConvertedOpportunityId;
        return OpportunityId;
    }
}

My button is an OnClick Javascript button with this code:

{!REQUIRESCRIPT("/soap/ajax/20.0/connection.js")}
{!REQUIRESCRIPT("/soap/ajax/10.0/apex.js")}
var opportunityId=sforce.apex.execute("ConvertLeadCustom","convertLeadtoAcc", {id:"{!Lead.Id}"});
var newURL = "/"+opportunityId[0].id+"/e";
window.location.href=newURL;

Answers:

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Method 1

Since your method returning opportunity Id means var opportunityId contains the actual opportunity Id

You just need redirect to

var newURL = "/"+opportunityId+"/e";
window.location.href=newURL;

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