javascript - Why is waitFor() ignoring my return value? -

this code not working:

casper.waitfor(function check(){     //wait new line appear in table , input box emptied     console.log("in waitfor:");     console.log(casper.evaluate(function(){return $("table.packageslisting  tr td:contains('some text')").length;}) );     console.log(casper.evaluate(function(){return $("table.packageslisting  tr td:contains('some text')").length;}) == 1 );     return       casper.evaluate(function(){return $("table.packageslisting  tr td:contains('some text')").length;}) == 1       //&&       //(casper.evaluate(function(){return $('input#addnewpackage').val();}) == "")       ;     },function then(){},     function ontimeout(){         this.capture("screenshots/"+label+".failed_timeout_waiting_for_package_add.png");     }); 

when run see is:

in waitfor: 1 true in waitfor: 1 true ... in waitfor: 1 true in waitfor: 1 true 

and timeout! must missing obvious, because using casper.waitfor() elsewhere in script, no problems!

the problem return statement on line itself. in javascript, semi-colons optional (see automatic semicolon insertion & return statements), same writing:

return null; casper.evaluate(/*...*/) == 1 ; 

when returning , of multiple booleans better (and more readable) assign them local vars. code looks like:

casper.waitfor(function check(){     //wait new line appear in table , input box emptied     var isintable = casper.evaluate(function(){return $("table.packageslisting  tr td:contains('some text')").length;}) == 1;     var inputisemptied = casper.evaluate(function(){return $('input#addnewpackage').val();}) == "";     return isintable && inputisemptied;     },function then(){},     function ontimeout(){ /*...*/ }     );