jquery - Ajax call throwing "TypeError: object is not a function" Exception -

this code throwing typeerror idea salt remote external server , append password , generate hash. problem code throwing typeerror says

typeerror: object not function

the following part of index_user_scripts.js .

/*jshint browser:true */  /*global localstorage, console, $ */  (function(){   "use strict";   /*   * hook event handlers    */   function register_event_handlers(){      $(document).ready(function(){        try {          if(!window.opendatabase) {            console.log('local databases not supported browser.');          } else {            var shortname = 'chtrshk';            var version = '1.0';            var displayname = 'chhatrasahayak';            var maxsize = 2*1024*1024;            var db = window.opendatabase(shortname, version, displayname, maxsize);            }        } catch(e) {          if (e == 2) {            // version mismatch.            console.log("invalid database version.");          } else {            console.log("unknown error "+ e +".");          }          return;        }        if ( localstorage.getitem("islogged") === true ){          $("#cs_now")[0].click();        }else{          localstorage.cleardata;          console.log("we haven\'t logged-in yet. let\'s login.");          console.log(window.location.pathname);          window.location = "index.html#login";        }      });             /* button  #login */      $(document).on("click", "#signin", function(evt)      {        if ($("[name=lg_pass]")[0].value === "" || $("[name=lg_roll]")[0].value === ""){return false;}        console.log($("[name=lg_roll]")[0].value);        console.log($("[name=lg_pass]")[0].value);        var salt = '';        try{            $.ajax({                async: true,                crossdomain: true,                url:"http://borngeek.tk/cs/in.php",                type:"post",                datatype:"jsonp",                timeout: 5000,                success: function(response){                  salt = response._s;                  console.log("success: fetched salt. " + salt);                },                error: function(data){                  console.error("error: failed fetch salt.");                }             });        }catch(e){console.error(e.name + ": " + e.message);}        console.log("checkpoint.");        var passstr = $("[name=lg_pass]")[0].value.concat(salt);        passstr = hex_sha512(passstr);        console.log(passstr);        try{         $.ajax({             async: true,             crossdomain: true,             url:"http://borngeek.tk/cs/in.php",             type:"post",            data:{"roll":$("[name=lg_roll]")[0].value,               "pass":passstr,               "salt":$("[name=lg_salt]")[0].value             },             success: function(response){console.log("login successful.");},            error: function(response){console.log("bad login attempt.");}          });        }catch(e){console.error(e.name + ": " + e.message);}        console.log("login attempt.");        return false;      });   }   document.addeventlistener("app.ready", register_event_handlers, false);  })();

just scanning through function calls in code, window.opendatabase(...) seems candidate. seems web sql database api isn't broadly supported, reported in accepted answer this similar question.