javascript - External file java script does not function -


my code not function in external file <script src="action_input.js"></script>.
put code in <body></body> or <head></head> , not function.

my code functions in <body><script> code js</script></body>, not so.
code is:

// identify form elements: var search_code = document.getelementbyid('search_code'); var insert_code = document.getelementbyid('insert_code'); var result = document.getelementbyid('result'); var button = document.getelementbyid('button'); var audio = new audio('sound.wav');   // respond button click button.onclick = function validate() {     // show verification result:     if(search_code.value == insert_code.value) {         result.textcontent = 'cod gasit';         result.classname = "ok";         audio.play(); //http://soundbible.com/tags-winning.html     } else {        result.textcontent = 'codul nu este corect';        result.classname = "not-ok";     }    // clear input when wrong:     if (search_code.value !== insert_code.value) {         insert_code.value = '';     }     return false; }; //sterge textul cand se da click pe input function clearfield(input) {          input.value = ""; };

my input is:

     <form>         <input type="text" name="search_code" onfocus="clearfield(this, this.placeholder='');" onblur="this.placeholder='introdu codul'" id="search_code" placeholder="introdu codul" autocomplete="off" value=""/><br/>         <input type="" name="insert_code" onfocus="clearfield(this, this.placeholder='');" onblur="this.placeholder='scaneaza codul'" id="insert_code" placeholder="scaneaza codul" autocomplete="off" value=""/><br/><br/>         <input type="submit" id="button" name="button" value="verifica cod" />     </form>

use e.preventdefault(); prevent default action of submit button or use type='button'

there no element having id result

try this:

var search_code = document.getelementbyid('search_code');  var insert_code = document.getelementbyid('insert_code');  var result = document.getelementbyid('result');  var button = document.getelementbyid('button');  var audio = new audio('sound.wav');      // respond button click  button.onclick = function validate(e) {    e.preventdefault();    // show verification result:    if (search_code.value == insert_code.value) {      result.textcontent = 'cod gasit';      result.classname = "ok";      audio.play(); //http://soundbible.com/tags-winning.html    } else {      result.textcontent = 'codul nu este corect';      result.classname = "not-ok";    }    // clear input when wrong:    if (search_code.value !== insert_code.value) {      insert_code.value = '';    }    return false;  };  //sterge textul cand se da click pe input  function clearfield(input) {    input.value = "";  };
<form>    <input type="text" name="search_code" onfocus="clearfield(this, this.placeholder='');" onblur="this.placeholder='introdu codul'" id="search_code" placeholder="introdu codul" autocomplete="off" value="" />    <br/>    <input type="" name="insert_code" onfocus="clearfield(this, this.placeholder='');" onblur="this.placeholder='scaneaza codul'" id="insert_code" placeholder="scaneaza codul" autocomplete="off" value="" />    <br/>    <br/>    <div id="result"></div>    <input type="submit" id="button" name="button" value="verifica cod" />  </form>


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