python - creating and executing a Javascript function with Selenium -

i trying create , execute javascript function selenium. doing this:

js_func = """      function blah(a, b, c) {         .         .         . }; """ self.selenium.execute_script(js_script) self.selenium.execute_script("blah", 1,2,3) 

i don't errors first 1 (creating function), second 1 gives me:

webdriverexception: message: u'blah not defined' 

is i'm doing valid? how can tell if function created? how can see errors (assuming there errors)?

it's how selenium executes javascript:

the script fragment provided executed body of anonymous function.

in effect, code is:

(function() {     function blah(a, b, c) {         ...     } })();  (function() {     blah(1, 2, 3); }); 

and due javascript's scoping rules, blah doesn't exist outside of anonymous function. you'll have make global function:

window.blah = function(a, b, c) {     ... } 

or execute both scripts in same function call.