23.23 User Validation with RFC call

Prerequisites

• Products: Liquid UI WS, Liquid UI Server or Local DLL, Client Software
• Commands: del(), pushbutton(), column(), table()

Purpose

The article details how to check the existence of a username by calling the BAPI_USER_EXISTENCE_CHECK function, based on the SAP Easy Access screen. Here, we’ll perform the following actions:

1. Delete the image container on the SAP Easy Access screen
2. Add an input field to enter the user name
3. Add a push button to execute the process
4. Add functions to validate spaces, trimmed strings, and blank strings, call Bapi, and display results

User Interface

//Create the file SAPLSMTR_NAVIGATION.E0100.sjs inside your scripts folder for customizing the SAP Easy Access screen
//Now, add the Liquid UI script to the above file and save it.

Customization

1. Delete the image container on the SAP Easy Access screen using del().
   
    

   // Deletes the image container on the SAP screen
   del("X[IMAGE_CONTAINER]");
   

    
   

    
2. Add an input field labeled User name to enter the user name.
   
    

   //Creates an input field to enter the user name
   inputfield([1,0],["Username"],[1,10],{"name":"z_user_name","size":"15"});
   

    
   

    
3. Add a push button labeled Check User Exist to execute the z_fmCallGetData process on click.
   
    

   //Creates a push button to execute the process
   pushbutton([3,1],["Check User Exist"],"?",{"size":[2.20],"process":z_fmCallGetData});
   

    
   

    
4. Add a function to remove blank spaces from variable values.
   
    

   //Function to remove blank spaces
   String.prototype.trim = function() {
      return this.replace(/^\s+|\s+$/g,"");
   }
   

5. Add the getString function to return the trimmed string.
   
    

   //Function to return trimmed string
   function getString(strInput) {
      return(typeof(strInput) == 'undefined' || strInput == 'undefined')? "" : 
   strInput.toString().trim();
   }
   

6. Add the isBlank function to check for blank string.
   
    

   //Function to check for blank string
   function isBlank(strInput) {
      var strVal = getString(strInput);
      var blank = strVal == "";
      return blank;
   }
   

7. Add the z_fmCallGetData function to call Bapi and display results.
   
    

   //Function to call Bapi and display results
   function z_fmCallGetData() {
      rfcresult = call('BAPI_USER_EXISTENCE_CHECK',{'in.USERNAME':'&V[z_user_name]','out.RETURN':'z_return'});
      if(rfcresult.rfc_rc != 0){
         // Cannot Call RFC for any reason
         // RFC call was *NOT* successful.
         // Displays message to user that rfc cannot be called (you can use the content of rfcresult.rfc_key)
         message('E:Error! RFC call failed to return data');
         enter("?");
         goto SCRIPT_END;
      } else{
      
      // RFC Call was successful
      if(!isBlank(z_return)){
         set('V[z_user_exist]',z_return.substring(24,60));
      }
      
      message('S:'+ z_user_exist);
      set('V[z_user_name]','');
      enter("?");
      SCRIPT_END:;
      }
   }
   

SAP Process

1. Refresh the SAP interface and input the username. Then, click on the Check User Exist push button. Upon successful verification, a confirmation message stating that "User (divya) exists" will be displayed, as shown below.
   
    
   

    
2. If the RFC call is unsuccessful due to any of the following conditions:
   
   • An exception is encountered
   • The specified username is not present
   • The entered username is not valid
   An error message Error! RFC call failed to return data is displayed at the bottom of the SAP screen, as shown below.