How to call an apex method from custom button in salesforce

Here is the simple example to execute apex method and passing parameters from a custom button in salesforce.

Here is the simple example to execute apex method and passing parameters from a custom button in salesforce.

Apex Class:

1. global class NameMergeController{
2.     webService static string getName(String fName, String lName){
3.         String fullName = 'Hi '+ fName +' '+ lName;
4.         return fullName;
5.     }
6. }

Button Code:

Passing Static Parameters:

1. {!REQUIRESCRIPT("/soap/ajax/33.0/connection.js")}
2. {!REQUIRESCRIPT("/soap/ajax/33.0/apex.js")}
3. var res = sforce.apex.execute("NameMergeController","getName",{fName :"Salesforce", lName: "Kings"});
4. alert(res);

Passing Dynamic Parameters:

1. {!REQUIRESCRIPT("/soap/ajax/33.0/connection.js")}
2. {!REQUIRESCRIPT("/soap/ajax/33.0/apex.js")}
3. var res = sforce.apex.execute("NameMergeController","getName",{fName:"{!Account.Name}", lName:"{!Account.Name}"});
4. alert(res);

Where,

NameMergeController > Class name

getName > Method name.

Please check this link, if you receive "No service available for class" exception.