javascript - Uncaught TypeError: Cannot read property 'length' of null JSON-JQUERY -


There are problems with its function and show uncut type error for the console: the 'length' of the property can not be read and Why not 

  function shownAMEplaylist () {$ .getJSON ("js / json / nameplaylist.json", function (data) {var items = []; $ .each (data, function ( Key, value) {$ ('Nameplaylist'). Append ('& lt; option & gt;' + value.title + '& lt; / option & gt;'}}); $ (' First-child '). Attr ("selected", "selected"); name playlist = $ (".nameplaylist option: selected") .text (); console.log (nameplaylist.l Ength); if (nameplaylist.length == 0) {$ ('#nameplaylist'). Css ('display', 'none'); $ ('# delplaylist'). CSS ('display', 'none ')}}}. Done (function () {// If an error show playlist has arrived in AJAX call);}) .fail (function () {// If any error in AJAX call console.log (' no Load nameplaylist '); $ (' #nameplaylist '). CSS (' Display ',' None '); $ (' # DanielList '). CSS (' Display ',' None '); $ ('#delplaylist') CSS ('display', 'none');); You are using two different selectors for "nameplaylist",    
 
 And  .nameplaylist  First of an "nameplaylist" means an element with a  id  and second, with the  class  of "nameplaylist" One element implies.  
  $ ('#nameplaylist')  and  $ ('.nameplaylist')  will not select the same element unless both of your elements  id   and "Nameplaylist"   class :  
   & Lt ;! - $ ('# nameplaylist') - & gt; & Lt; Elem class = "name playlist" /> & Lt ;! - $ ('.nameplaylist') - & gt;   
 Decide how you are actually using and can modify your selectors accordingly.  
 By looking at your code, I think your fix bus line 7 and 8 per:  
  $ ('#nameplaylist option: first-child'). Ether ("selected", "selected"); Nameplaylist = $ ("#nameplaylist Options: Selected") .text ();

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