Question

I have a common validation function

function connect_and_update_destination() {
        var flag = true;
        // Validate IP
        if (!validate_ip_address()) {
            alert(protect.lang.enter_valid_ip);
            return;
        }

        if ($('#pjm_alias').val() === '') {
            $('#pjm_alias').focus();
            alert(protect.lang.enter_alias);
            return;
        }

        if ($('#pjm_auth_name').val() === '') {
            $('#pjm_auth_name').focus();
            alert(protect.lang.enter_auth_name);
            return;
        }

        if ($('#pjm_auth_password').val() === '') {
            $('#pjm_auth_password').focus();
            alert(protect.lang.enter_auth_pwd);
            return;
        }
        var ip = $('#pjm_ip1').val()+'.'+$('#pjm_ip2').val()+'.'+$('#pjm_ip3').val()+'.'+$('#pjm_ip4').val();
        return establish_connection(ip, $('#pjm_alias').val(), $('#pjm_auth_name').val(), $('#pjm_auth_password').val());
    }

After successful validation it always return establish_connection(), My problem is that am calling this connect_and_update_destination() like this,

function first_call(){
  connect_and_update_destination();
}
function second_call(){
  connect_and_update_destination();
}

When first call i need to return after successful validation establish_connection(), But when ever i called its using second function [second_call()] it should not return establish_connection() insted of return establish_connection() i need to only return . But how can i do this, Means i dont want to enter establish_connection() when ever i call using second_call().

Thanks in advance.

Answer 1

You could do something as simple as passing a variable.

function connect_and_update_destination(establishConnection) {

 ...

 if(!establishConnection)
   return;

 return establish_connection(ip, $('#pjm_alias').val(), $('#pjm_auth_name').val(), $('#pjm_auth_password').val());
}

function first_call(){
  connect_and_update_destination(true);
}
function second_call(){
  connect_and_update_destination(false);
}

For a more generic solution, you could pass a callback:

function connect_and_update_destination(callback) {

    ...

    if(typeof callback === 'function') {
       return callback(ip);
    }

    return;
}

function first_call() {
    var result = connect_and_update_destination(function(ip) {
       return establish_connection(ip, $('#pjm_alias').val(), $('#pjm_auth_name').val(), $('#pjm_auth_password').val());
    });
}

function second_call() {
    connect_and_update_destination();
}