javascript - show content not defined -


i'm trying implement show more & show less. when executing code , error "show content not defined" can't pick up. missing?

<script type="text/javascript" language="javascript">     function hidecontent(hide) {         document.getelementbyid("hide").style.display = "none";     }     function showcontent(show) {         document.getelementbyid("hide").style.display = "list-item";     }     function reversedisplay(hide) {         if (document.getelementbyid("hide").style.display == "none") { document.getelementbyid(d).style.display = "block"; }         else { document.getelementbyid(d).style.display = "none"; }     }     </script>      heading<br/>     <a href="javascript:showcontent(show)" >     show      </a>     <div id="hide" style="display:none;">     <p>content goes here</p>     <a href="javascript:hidecontent(hide)">     hide     </a>     </div>

you should not use inline javascript because code scales, becomes less , less maintainable. instead should use dom api methods select element , use .addeventlistener method assign event listener function.

however, reason getting error because using variables in javascript have not been defined. causes error , stops script, means showcontent , hidecontent won't initialized , therefore when try use functions won't exist, throwing error.

var hidd = document.getelementbyid("hidden");  var hide = document.getelementbyid("hide");  var show = document.getelementbyid("show");    show.addeventlistener('click', function(){      hidd.style.display = '';      show.style.display = 'none';  }, false);    hide.addeventlistener('click', function(){      hidd.style.display = 'none';      show.style.display = '';  }, false);
<a id="show" href="#">show</a>  <div id="hidden" style="display:none;">      <a id="hide" href="#">hide</a>      <p>content goes here</p>  </div>


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