jQuery - Illegal invocation

Question

jQuery v1 7 2  I have this funcion that is giving me the following error while executing    Uncaught TypeError  Illegal invocation   Here s the function       form name  twp-tool-distance-form     on  submit   function e        e preventDefault         var from      form name  twp-tool-distance-form   input name  from          var to      form name  twp-tool-distance-form   input name  to          var unit      form name  twp-tool-distance-form   input name  unit          var speed   game unit speed   unit  val          if      d 3    d 3    test   from  val                     from  css  border-color    red            return false             if      d 3    d 3    test   to  val                     to  css  border-color    red            return false             var data             from   from          to   to          speed   speed               ajax           url   base url  index php           type   POST           dataType   json           data  data          cache   false        done function response            alert response                return false        If I remove data from ajax call  it works    any suggestions   Thanks

User · Answer

Just for the record it can also happen if you try to use undeclared variable in data like  var layout         ajax           data        layout  laoyut    notice misspelled variable name

User · Answer

Try to set processData  false in ajax settings like this    ajax       url   base url  index php       type   POST       dataType   json       data  data      cache   false      processData  false    done function response        alert response

User · Answer

My problem was unrelated to processData  It was because I sent a function that cannot be called later with apply because it did not have enough arguments  Specifically I shouldn t have used alert as the error callback     ajax       url  csvApi      success  parseCsvs      dataType   json       timeout  5000      processData  false      error  alert       See this answer for more information on why that can be a problem  Why are certain function calls termed  quot illegal invocations quot  in JavaScript   The way I was able to discover this was by adding a console log list  firingIndex    to jQuery so I could track what it was firing   This was the fix   function myError jqx  textStatus  errStr        alert errStr        ajax       url  csvApi      success  parseCsvs      dataType   json       timeout  5000      error  myError    Note that passing  alert  instead can cause a  jquery js 3189 Uncaught TypeError  Illegal invocation  sometimes

User · Answer

If you want to submit a form using Javascript FormData API with uploading files you need to set below two options   processData  false  contentType  false   You can try as follows     Ajax Form Submission   document  on  click     afs   function  e        e preventDefault        e stopPropagation        var thisBtn     this       var thisForm   thisBtn closest  form        var formData   new FormData thisForm 0          var formData   thisForm serializeArray           ajax           type   POST           url    lt   base url     gt assignment createAssignment           data  formData          processData  false          contentType  false          success function data               if data   yes                                 alert  Success  Record inserted successfully                              else if data   no                                 alert  Error  Record not inserted successfully                             else                               alert  Error  Try again

User · Answer

I think you need to have strings as the data values  It s likely something internally within jQuery that isn t encoding serializing correctly the To  amp  From Objects   Try   var data         from   from val        to   to val        speed   speed      Notice also on the lines     from  css       to  css    You don t need the jQuery wrapper as To  amp  From are already jQuery objects

User · Answer

In my case  using webpack 4  within an anonymous function  that I was using as a callback   I had to use window   ajax   instead of   ajax   despite having   import   from  jquery   window     window jQuery

User · Answer

Also this is a cause too  If you built a jQuery collection  via  map   or something similar  then you shouldn t use this collection in  ajax   s data  Because it s still a jQuery object  not plain JavaScript Array  You should use  get   at the and to get plain js array and should use it on the data setting on  ajax

User · Answer

In my case  I just changed   Note  This is in case of Django  so I added csrftoken  In your case  you may not need it       Added contentType  false  processData  false      Commented out  Content-Type    application json      ajax       url  location pathname       type   POST       crossDomain  true      dataType   json       headers             X-CSRFToken   csrftoken           Content-Type    application json             data formData      success   response  textStatus  jQxhr    gt                error   jQxhr  textStatus  errorThrown    gt                to    ajax       url  location pathname       type   POST       crossDomain  true      dataType   json       contentType  false      processData  false      headers             X-CSRFToken   csrftoken             Content-Type    application json              data formData      success   response  textStatus  jQxhr    gt                error   jQxhr  textStatus  errorThrown    gt                and it worked

User · Answer

In My case I have t define all variables which I am passing to data in ajax   var page   1     ajax       url   your url       type   post       data     page    page   search candidate    search candidate       success  function result           alert  function called               I have just defined variable var search candidate    candidate name   and its working   var page   1  var search candidate    candidate name      defined   ajax       url   your url       type   post       data     page    page   search candidate    search candidate       success  function result           alert  function called

[jquery] jQuery - Illegal invocation

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