javascript - getting error when trying to use ajax with select2 -


any idea how debug ajax funtionality of select2? here's example of i'm trying implement: https://jsbin.com/sohupoviko/edit?html,output , here's result set http://localhost:4000/users:

[   {     "id": 1,     "first_name": "john",     "last_name": "smith"   },   {     "id": 2,     "first_name": "john2",     "last_name": "smith2"   } ]

this local error being returned when run code locally:

jquery.min.js:2 jquery.deferred exception: cannot read property 'length' of undefined typeerror: cannot read property 'length' of undefined     @ d (https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js:2:5214)     @ object.f.transport.d.status.0.d.status.e.trigger.message (https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js:2:4227)     @ j (http://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js:2:29948)     @ k (http://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js:2:30262) undefined

any idea root cause might or how debug?

in backend code please change query use "as text"

example:

$query = $mysqli->query("select id, first_name, last_name text users fist_name '%$term%'")); while ($row = mysql_fetch_assoc($query)) {        $return[] = $row;      }  echo json_encode($return);

credit goes -> select2.js error: cannot read property 'length' of undefined


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