jquery custom validation method with a callback -

so found can add custom validation logic. if it's simple enough it's not problem, right?

$.validator.addmethod('customrule',function(val, el){     return val > 2; },'value cannot smaller 2');  $('#myinput').rules('add', { customrule : true }); 

now, if have little bit more difficult (a rest call example) still can done:

$.validator.addmethod('customrule',function(val, el){     var validator = this;     $.get('checkvalueonserver',val).done(function(isvalid){         if(!isvalid){            var errors = {};             errors[el.name] = 'server says: value not right!';            validator.showerrors(errors);         }         validator.stoprequest(el, isvalid);     })     return 'pending'; },''); 

now, in case need call function callback, that

$.validator.addmethod('customrule',function(val, el){     var validator = this;     checkvalueonserver(el, function(isvalid){ // function runs few secs , returns callback result          if(!isvalid){            var errors = {};             errors[el.name] = 'called function says: value not right!';            validator.showerrors(errors);         }         validator.stoprequest(el, isvalid);     });     return 'pending'; },''); 

you see old callback, not deferred object. in later case if call

$('form').valid() reports it's true, although custom called function reports validation rule didn't pass , element highlighted , error message shown. what's wrong? what's right way tell thing: form invalid?

when using custom validation method, function typically returns true or false.

• if custom validation function returns true, element passed validation , there no error message triggered. http://jsfiddle.net/kcqy5/1/

• if custom validation function returns false, element failed validation , error message displayed. http://jsfiddle.net/kcqy5/2/

• if custom validation function not return true or false, results not seem predictable. http://jsfiddle.net/kcqy5/

yours returning string contains text 'pending', required error message displayed though form passes validation. usage outside scope of documentation...

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as per documentation:

method callback
actual method implementation, returning true if element valid. first argument: current value. second argument: validated element. third argument: parameters.