jquery - Why does my dynamically changing link not work? (Javascript) -

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i making flash site changes download link everytime button selected on page corespronding flash file download. weird part got working after week of working on project stopped , have no idea why input great.

     $(document).ready(function () {             var links = [         'swfs/#1%20(special%20japanese%20extended%20dance%20mix).swf',         'swfs/$d6.swf',         'swfs/(mad)%20huh.swf'         ];           var displaytext = [         '#1 (special japanese extended dance mix)',         '$d6',         '(mad) huh'         ];          var c = 0;             var flashmovie, test, temp;              function init() {                 flashmovie = document.getelementbyid('flashmovie');                 document.getelementbyid('back').onclick = function () {                     if (c == 0) {                         c = links.length;                     }                     c--                     displayfiles();                     download();                 }                  document.getelementbyid('next').onclick = function () {                     if (c == links.length - 1) {                         c = -1;                     }                     c++;                     displayfiles();                     download();                 }                  document.getelementbyid('rand').onclick = function () {                     temp = c;                     while (c == temp) {                         c = math.floor(math.random() * links.length);                     }                     displayfiles();                     download();                 }  // scripts left , right arrow key functionality         document.addeventlistener('keydown', function (e) {             if (e.which == 37) {                 $("#back").click();             }         });          document.addeventlistener('keydown', function (e) {             if (e.which === 39) {                 $("#next").click();             }         });              }              function displayfiles() {                  test = links[c].substring(links[c].lastindexof('.') + 1, links[c].length);                 document.getelementbyid('title').innerhtml = displaytext[c];                  flashmovie.innerhtml =                     '<object type="application/x-shockwave-flash" data="' + links[c] + '">' +                     '<param name="movie" value="' + links[c] + '">' +                     '<\/object>';             }              function download() {                 document.getelementbyid('downlink').setattribute('href', links[c]);                 document.getelementbyid('downlink').setattribute('download', displaytext[c]);             }              window.addeventlistener ?                 window.addeventlistener('load', init, false) :                 window.attachevent('onload', init);         });

html

<body>      <div class="titletext">             <h1>anon curb</h1>     </div>     <div id="flashmovie" class="flashmoviesamp">         <object type="application/x-shockwave-flash" data="swfs/welcomeflash.swf">'+             <param name="movie" value="http://www.anon-curb.com/swfs/welcomeflash.swf">         </object>     </div>     <!-- end #container -->     <div id="buttoncon">          <div id="buttons">             <button id="next">next</button>              <button id="rand">random</button>              <button id="back">back</button>         </div>      </div>      <div id="titlecon">         <a href="swfs/welcomeflash.swf" class="downlink" download="welcomeflash">             <div id="title">hit random button</div>         </a>     </div>          <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0-beta1/jquery.min.js"></script>      <script src="js/flashcollection.js"></script> </body>

the main problem function download(), tried element id "downlink", there no id assigned of tag in html, add id='downlink' tag now. downlink works fine now.

just bit suggestions: have jquery involved, can use jquery selector when dealing dom. more convenient helps keep consistency of code. 

$(document).ready(function () {      var links = [          'swfs/#1%20(special%20japanese%20extended%20dance%20mix).swf',          'swfs/$d6.swf',          'swfs/(mad)%20huh.swf'      ];        var displaytext = [          '#1 (special japanese extended dance mix)',          '$d6',          '(mad) huh'      ];        var c = 0;      var flashmovie, test, temp;        function init() {          flashmovie = document.getelementbyid('flashmovie');          document.getelementbyid('back').onclick = function () {              if (c == 0) {                  c = links.length;              }              c--              displayfiles();              download();          }            document.getelementbyid('next').onclick = function () {              if (c == links.length - 1) {                  c = -1;              }              c++;              displayfiles();              download();          }            document.getelementbyid('rand').onclick = function () {              temp = c;              while (c == temp) {                  c = math.floor(math.random() * links.length);              }              displayfiles();              download();          }    // scripts left , right arrow key functionality          document.addeventlistener('keydown', function (e) {              if (e.which == 37) {                  $("#back").click();              }          });            document.addeventlistener('keydown', function (e) {              if (e.which === 39) {                  $("#next").click();              }          });        }        function displayfiles() {            test = links[c].substring(links[c].lastindexof('.') + 1, links[c].length);          document.getelementbyid('title').innerhtml = displaytext[c];            flashmovie.innerhtml =              '<object type="application/x-shockwave-flash" data="' + links[c] + '">' +              '<param name="movie" value="' + links[c] + '">' +              '<\/object>';      }        function download() {          document.getelementbyid('downlink').setattribute('href', links[c]);          document.getelementbyid('downlink').setattribute('download', displaytext[c]);      }        window.addeventlistener ?          window.addeventlistener('load', init, false) :          window.attachevent('onload', init);  });
<html>      <head>      <title>title</title>      <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0-beta1/jquery.min.js"></script>      <script src="js/flashcollection.js"></script>      </head>  <body>  <div class="titletext">      <h1>anon curb</h1>  </div>  <div id="flashmovie" class="flashmoviesamp">      <object type="application/x-shockwave-flash" data="swfs/welcomeflash.swf">'+          <param name="movie" value="http://www.anon-curb.com/swfs/welcomeflash.swf">      </object>  </div>  <!-- end #container -->  <div id="buttoncon">        <div id="buttons">          <button id="next">next</button>            <button id="rand">random</button>            <button id="back">back</button>      </div>    </div>    <div id="titlecon">      <a href="swfs/welcomeflash.swf" class="downlink" download="welcomeflash" id="downlink">          <div id="title">hit random button</div>      </a>  </div>  </body>  </html>


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