JavaScript Prompt Box Cancel Button?

Question

I have a JavaScript function as follows:

function popup(username) {
var req = createAjaxObject();
var message = prompt(\"Message:\",\"\");
if(message != \"\"         


        

Answer 1

                $.messager.prompt('Save To File', 'FileName:', function(e){
                    if (e.response!='undefined'){
                        if (r!="")
                        {   
                          alert('Your FileName is:' + r);   
                        }
                        else
                        {
                          $.messager.alert('Err...','FileName cannot empty!!!');
                        }
                    }
                });