JavaScript jQuery - is not defined- function error

Question

I am trying to run a JavaScript jQuery function and Firebug gets the error     is not defined   function       The JavaScript code is placed inside a file called core js and referenced by index php  What causes this error   JavaScript    lt script type  text javascript  gt      var formObject             run   function obj                if  obj val                             obj nextAll   update   html   lt option value    gt ---- lt  option gt    attr  disabled   true                 else                   var id   obj attr  id                    var v   obj val                    jQuery getJSON   mod update php     id   id  value   v    function data                        if   data error                            obj next   update   html data list  removeAttr  disabled                          else                           obj nextAll   update   html   lt option value    gt ---- lt  option gt    attr  disabled   true                                                                                   function                  update   live  change   function                 formObject run   this                          lt  script gt    PHP HTML   lt html gt       lt select name  main  id  category  class  update  gt       lt option value    gt Select one lt  option gt            lt   if   empty  list       gt               lt   foreach  list as  row      gt                   lt option value   lt  php echo  row  id      gt   gt                       lt   echo  row  name      gt                   lt  option gt                lt       gt           lt       gt        lt  select gt   lt  html gt

User · Answer

Im using Asp Net Core 2 2 with MVC and Razor cshtml My JQuery is referenced in a layout page I needed to add the following to my view cshtml    section Scripts    script-here

User · Answer

Include jquery js and if it is included  load it before any other JavaScript code

User · Answer

You need to include the jQuery library on your page   You can download jQuery here and host it yourself or you can link from an external source like from Google or Microsoft   Google s    lt script type  text javascript  src  http   ajax googleapis com ajax libs jquery 1 6 2 jquery min js  gt  lt  script gt    Microsoft s    lt script type  text javascript  src  http   ajax microsoft com ajax jquery jquery-1 6 2 min js  gt

User · Answer

You must not have made jQuery available to your script   Add this to the top of your file    lt script type  text javascript  src  http   code jquery com jquery-1 7 1 min js  gt  lt  script gt    This issue is related to the jQuery JavaScript file not added to the PHP JSP ASP file properly  This goes out and gets the jQuery code from the source  You could download that and reference it locally on the server which would be faster   Or either one can directly link it to jQuery or GoogleCDN or MicrosoftCDN   How do add jQuery to your webpage

User · Answer

if you are trying to use jquery in your electron app before adding jquery you should add it to your modules    lt script gt      if  typeof module      object             window module   module          module   undefined         lt  script gt   lt script src  js jquery-3 5 1 min js  gt  lt  script gt

User · Answer

I have solved it as follow   import   from  jquery     function                 code let script

User · Answer

This may be useful to someone   If you already got jQuery but still get this error  check you include jQuery before the js that uses it  specially if you use  RenderBody   in ASP NET C   You have to include jQuery before the  RenderBody   if you include the js inside the view that  RenderBody   calls

User · Answer

Try    function            function                 update   live  change   function                 formObject run   this                           jQuery     By using this way you ensure the global variable jQuery will be bound to the     inside the closure  Just make sure jQuery is properly loaded into the page by inserting    lt script type  text javascript  src  http   code jquery com jquery-1 7 1 min js  gt  lt  script gt    Replace  http   code jquery com jquery-1 7 1 min js  to the path where your jQuery source is located within the page context

[javascript] JavaScript/jQuery - "$ is not defined- $function()" error

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