Django jquery ajax remote validate returns TypeError: Cannot read property 'apply' of undefined -


i trying validate 1 field of form using jquery & validate.js in django.

i've read many posts, regardless of various examples, fails on same error.
simply use remote method included in plugin. last 1 hit , simplest code sample, same result:

jquery.validate.js:1594 uncaught typeerror: cannot read property 'apply' of undefined.  exception occurred when checking element id_client_code, check 'remote' method. @ function.$.ajax (jquery.validate.js:1594) @ $.validator.remote (jquery.validate.js:1529) @ $.validator.check (jquery.validate.js:777) @ $.validator.element (jquery.validate.js:492) @ $.validator.onfocusout (jquery.validate.js:300) @ htmlinputelement.delegate (jquery.validate.js:423) @ htmlformelement.dispatch (jquery-3.2.1.slim.min.js:3) @ htmlformelement.q.handle (jquery-3.2.1.slim.min.js:3) @ object.trigger (jquery-3.2.1.slim.min.js:3) @ object.simulate (jquery-3.2.1.slim.min.js:3)

here views.py section remote, returns false expected when called in tab:

def validate_client_code(request): is_available = 'false' if request.is_ajax():     client_code = request.get.get('client_code', none)     try:         client.objects.get(client_code)     except client.doesnotexist:         is_available = 'true' return httpresponse(is_available)

and here script block 

<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js"></script> <script>         $("#new-client").validate({             rules: {                 client_code: {                     required: true,                     remote: "/clients/ajax/validate_client_code/"                 },                 messages: {                     client_code: {remote: "the client code taken"}                 }             }         }); </script>

html rendered (using crispy forms):

<form class="form-horizontal" method="post" action="/clients/new/"   enctype="multipart/form-data" id="new-client"> <input type='hidden' name='csrfmiddlewaretoken' value='ek...'/> <div id="div_id_client_code" class="form-group"><label for="id_client_code"                                                        class="form-control-label requiredfield">     client code<span class="asteriskfield">*</span></label>     <div             class=""><input type="text" name="client_code"                             maxlength="10"                             class="textinput textinput form-control"                             required id="id_client_code"/>     </div> </div> <div id="div_id_client_name" class="form-group">     <div class="control-group">         <div class="controls">             <button class="btn btn-primary">update</button>             <a class="btn btn-secondary" href="/clients/" role="button">cancel</a>         </div>     </div></form>

chrome console keeps spitting out error above when enter value (known dupe or not).


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