Hide And Show Error - Artificial Intelligence

HarshaLenka
February 21, 2016
101 views
3 votes
3 Answers

I’m unable to show/hide divs. It gives me error cannot read property style from null.

Any help would be appreciated.

function HideAllShowOne(d) {
  // Between the quotation marks, list the id values of each div.

  var IDvaluesOfEachDiv = "w11 W12 W21 w31";

  //-------------------------------------------------------------
  IDvaluesOfEachDiv = IDvaluesOfEachDiv.replace(/[,s"']/g, " ");
  IDvaluesOfEachDiv = IDvaluesOfEachDiv.replace(/^s*/, "");
  IDvaluesOfEachDiv = IDvaluesOfEachDiv.replace(/s*$/, "");
  IDvaluesOfEachDiv = IDvaluesOfEachDiv.replace(/  +/g, " ");
  var IDlist = IDvaluesOfEachDiv.split(" ");
  for (var i = 0; i < IDlist.length; i++) {
    HideContent(IDlist[i]);
  }
  ShowContent(d);
}


function HideContent(d) {
  document.getElementById(d).style.display = "none";
}

function ShowContent(d) {
  document.getElementById(d).style.display = "block";
}

function ReverseDisplay(d) {
  if (document.getElementById(d).style.display == "none") {
    document.getElementById(d).style.display = "block";
  } else {
    document.getElementById(d).style.display = "none";
  }
}

<div id='menu' class="col-sm-4">
  <ul>
    <li>
      <a class='text-center'>
        <img src='student/student.jpg' class='img-responsive img-circle ' width='100px' height='100px' style=' float:none; ' />
      </a>
    </li>
    <li><a href='#'><b>harsha lenka</b></a>
    </li>
    <li><a href='#home'>Home</a>
    </li>
    <li class='active has-sub'><a href='#'>Week 1</a>
      <ul>
        <li><a href=javascript:HideAllShowOne( 'w11')>Back propagation Algorithm</a>
        </li>
        <li><a href=javascript:HideAllShowOne( 'w12')>Introduction</a>
        </li>
      </ul>
    </li>
    <li class='has-sub'><a href='#'>Week 2</a>
      <ul>
        <li><a href=href=javascript:HideAllShowOne( 'w21')>Introduction</a>
        </li>
      </ul>
    </li>
    <li class='has-sub'><a href='#'>Week 3</a>
      <ul>
        <li><a href=href=javascript:HideAllShowOne( 'w31')>Introduction</a>
        </li>
      </ul>
    </li>
    <li class=' has-sub'><a href='#'>Assignments</a>
      <ul>
        <li class='has-sub'><a href='#'>Mid Term 1</a>
          <ul>
            <li><a href='#'>Assignment 1</a>
            </li>
            <li><a href='#'>Assignment 2</a>
            </li>
          </ul>
        </li>
        <li class='has-sub'><a href='#'>Mid Term 2</a>
          <ul>
            <li><a href='#'>Assignment 1</a>
            </li>
            <li><a href='#'>Assignment 2</a>
            </li>
          </ul>
        </li>
      </ul>
    </li>
    <li><a href='#'>About</a>
    </li>

  </ul>
</div>

<div id="ved_dat" class="col-sm-8">
  <div id='#w11' style='display:none;'>
    <video width='500' height='500' controls>
      <source src='courses/Artificial Intelligence/week1/Back propagation Algorithm.mp4' type='video/mp4'>Your browser does not support the video tag.</video>
  </div>
  <div id='#w12' style='display:none;'>
    <video width='500' height='500' controls>
      <source src='courses/Artificial Intelligence/week1/Introduction.mp4' type='video/mp4'>Your browser does not support the video tag.</video>
  </div>
  <div id='#w21' style='display:none;'>
    <video width='500' height='500' controls>
      <source src='courses/Artificial Intelligence/week2/Introduction.mp4' type='video/mp4'>Your browser does not support the video tag.</video>
  </div>
  <div id='#w31' style='display:none;'>
    <video width='500' height='500' controls>
      <source src='courses/Artificial Intelligence/week3/Introduction.mp4' type='video/mp4'>Your browser does not support the video tag.</video>
  </div>
</div>


<div>
</div>

</body>
<script type='text/javascript'>
  <!-- 
  
    //-->
</script>

Answers

Chosen as BEST ANSWER

Finally did it thanks to your help guys :)

   <script type='text/javascript'>
    var ids = $.map($('#ved_dat div'), function(n,i) {
                  return n.id
              });

        function show_hide(d){

          for (i = 0; i < ids.length; i++) { 
              if(ids[i]!=d){
                document.getElementById(ids[i]).style.display='none';
              }
          }
         document.getElementById(d).style.display='block';

        }

      </script>

(Edit)

You are having many silly mistakes in your code

Remove extra white space before the parameter of all function call

eg : <a href=javascript:HideAllShowOne( 'w11')>Back propagation Algorithm</a>

Corrected code :

<a href=javascript:HideAllShowOne('w11')>Back propagation Algorithm</a>

All your div ids have Lower-case w.

And two of your w in var IDvaluesOfEachDiv = "w11 W12 W21 w31" are Upper-case, W12 and W21

Note : ids are case-sensitive

Remove double href= on Week 2 and Week 3 sub li
You should not provide # before the id in divs

EDIT : Provided a working snippet below

function HideAllShowOne(d) {
  // Between the quotation marks, list the id values of each div.

  var IDvaluesOfEachDiv = "w11 w12 w21 w31";

  //-------------------------------------------------------------
  IDvaluesOfEachDiv = IDvaluesOfEachDiv.replace(/[,s"']/g, " ");
  IDvaluesOfEachDiv = IDvaluesOfEachDiv.replace(/^s*/, "");
  IDvaluesOfEachDiv = IDvaluesOfEachDiv.replace(/s*$/, "");
  IDvaluesOfEachDiv = IDvaluesOfEachDiv.replace(/  +/g, " ");
  var IDlist = IDvaluesOfEachDiv.split(" ");
  for (var i = 0; i < IDlist.length; i++) {
    HideContent(IDlist[i]);
  }
  ShowContent(d);
}


function HideContent(d) {
  document.getElementById(d).style.display = "none";
}

function ShowContent(d) {
  document.getElementById(d).style.display = "block";
}

function ReverseDisplay(d) {
  if (document.getElementById(d).style.display == "none") {
    document.getElementById(d).style.display = "block";
  } else {
    document.getElementById(d).style.display = "none";
  }
}

<div id='menu' class="col-sm-4">
  <ul>
    <li>
      <a class='text-center'>
        <img src='student/student.jpg' class='img-responsive img-circle ' width='100px' height='100px' style=' float:none; ' />
      </a>
    </li>
    <li><a href='#'><b>harsha lenka</b></a>
    </li>
    <li><a href='#home'>Home</a>
    </li>
    <li class='active has-sub'><a href='#'>Week 1</a>
      <ul>
        <li><a href="javascript:HideAllShowOne('w11')">Back propagation Algorithm</a>
        </li>
        <li><a href="javascript:HideAllShowOne('w12')">Introduction</a>
        </li>
      </ul>
    </li>
    <li class='has-sub'><a href='#'>Week 2</a>
      <ul>
        <li><a href="javascript:HideAllShowOne('w21')">Introduction</a>
        </li>
      </ul>
    </li>
    <li class='has-sub'><a href='#'>Week 3</a>
      <ul>
        <li><a href="javascript:HideAllShowOne('w31')">Introduction</a>
        </li>
      </ul>
    </li>
    <li class=' has-sub'><a href='#'>Assignments</a>
      <ul>
        <li class='has-sub'><a href='#'>Mid Term 1</a>
          <ul>
            <li><a href='#'>Assignment 1</a>
            </li>
            <li><a href='#'>Assignment 2</a>
            </li>
          </ul>
        </li>
        <li class='has-sub'><a href='#'>Mid Term 2</a>
          <ul>
            <li><a href='#'>Assignment 1</a>
            </li>
            <li><a href='#'>Assignment 2</a>
            </li>
          </ul>
        </li>
      </ul>
    </li>
    <li><a href='#'>About</a>
    </li>

  </ul>
</div>

<div id="ved_dat" class="col-sm-8">
  <div id='w11' style='display:none;'>
    <video width='500' height='500' controls>
      <source src='courses/Artificial Intelligence/week1/Back propagation Algorithm.mp4' type='video/mp4'>Your browser does not support the video tag.</video>
  </div>
  <div id='w12' style='display:none;'>
    <video width='500' height='500' controls>
      <source src='courses/Artificial Intelligence/week1/Introduction.mp4' type='video/mp4'>Your browser does not support the video tag.</video>
  </div>
  <div id='w21' style='display:none;'>
    <video width='500' height='500' controls>
      <source src='courses/Artificial Intelligence/week2/Introduction.mp4' type='video/mp4'>Your browser does not support the video tag.</video>
  </div>
  <div id='w31' style='display:none;'>
    <video width='500' height='500' controls>
      <source src='courses/Artificial Intelligence/week3/Introduction.mp4' type='video/mp4'>Your browser does not support the video tag.</video>
  </div>
</div>


<div>
</div>

</body>
<script type='text/javascript'>
  <!-- 
  
    //-->
</script>

In addition to @Munawir’s answer, in <div id='#w11' style='display:none;'> element id is #w11 and not w11. Remove # from id.

function HideAllShowOne(d) {
  // Between the quotation marks, list the id values of each div.

  var IDvaluesOfEachDiv = "w11 W12 W21 w31";

  //-------------------------------------------------------------
  IDvaluesOfEachDiv = IDvaluesOfEachDiv.replace(/[,s"']/g, " ");
  IDvaluesOfEachDiv = IDvaluesOfEachDiv.replace(/^s*/, "");
  IDvaluesOfEachDiv = IDvaluesOfEachDiv.replace(/s*$/, "");
  IDvaluesOfEachDiv = IDvaluesOfEachDiv.replace(/  +/g, " ");
  console.log(IDvaluesOfEachDiv)
  var IDlist = IDvaluesOfEachDiv.split(" ");
  for (var i = 0; i < IDlist.length; i++) {
    HideContent(IDlist[i].toLowerCase());
  }
  ShowContent(d);
}


function HideContent(d) {
  console.log(document.getElementById(d),d)
  document.getElementById(d).style.display = "none";
}

function ShowContent(d) {
  document.getElementById(d).style.display = "block";
}

function ReverseDisplay(d) {
  if (document.getElementById(d).style.display == "none") {
    document.getElementById(d).style.display = "block";
  } else {
    document.getElementById(d).style.display = "none";
  }
}

<div id='menu' class="col-sm-4">
  <ul>
    <li>
      <a class='text-center'>
        <img src='student/student.jpg' class='img-responsive img-circle ' width='100px' height='100px' style=' float:none; ' />
      </a>
    </li>
    <li><a href='#'><b>harsha lenka</b></a>
    </li>
    <li><a href='#home'>Home</a>
    </li>
    <li class='active has-sub'><a href='#'>Week 1</a>
      <ul>
        <li><a href=javascript:HideAllShowOne('w11')>Back propagation Algorithm</a>
        </li>
        <li><a href=javascript:HideAllShowOne( 'w12')>Introduction</a>
        </li>
      </ul>
    </li>
    <li class='has-sub'><a href='#'>Week 2</a>
      <ul>
        <li><a href=href=javascript:HideAllShowOne( 'w21')>Introduction</a>
        </li>
      </ul>
    </li>
    <li class='has-sub'><a href='#'>Week 3</a>
      <ul>
        <li><a href=href=javascript:HideAllShowOne( 'w31')>Introduction</a>
        </li>
      </ul>
    </li>
    <li class=' has-sub'><a href='#'>Assignments</a>
      <ul>
        <li class='has-sub'><a href='#'>Mid Term 1</a>
          <ul>
            <li><a href='#'>Assignment 1</a>
            </li>
            <li><a href='#'>Assignment 2</a>
            </li>
          </ul>
        </li>
        <li class='has-sub'><a href='#'>Mid Term 2</a>
          <ul>
            <li><a href='#'>Assignment 1</a>
            </li>
            <li><a href='#'>Assignment 2</a>
            </li>
          </ul>
        </li>
      </ul>
    </li>
    <li><a href='#'>About</a>
    </li>

  </ul>
</div>

<div id="ved_dat" class="col-sm-8">
  <div id='w11' style='display:none;'>
    <video width='500' height='500' controls>
      <source src='courses/Artificial Intelligence/week1/Back propagation Algorithm.mp4' type='video/mp4'>Your browser does not support the video tag.</video>
  </div>
  <div id='w12' style='display:none;'>
    <video width='500' height='500' controls>
      <source src='courses/Artificial Intelligence/week1/Introduction.mp4' type='video/mp4'>Your browser does not support the video tag.</video>
  </div>
  <div id='w21' style='display:none;'>
    <video width='500' height='500' controls>
      <source src='courses/Artificial Intelligence/week2/Introduction.mp4' type='video/mp4'>Your browser does not support the video tag.</video>
  </div>
  <div id='w31' style='display:none;'>
    <video width='500' height='500' controls>
      <source src='courses/Artificial Intelligence/week3/Introduction.mp4' type='video/mp4'>Your browser does not support the video tag.</video>
  </div>
</div>


<div>
</div>

</body>
<script type='text/javascript'>
  <!-- 
  
    //-->
</script>

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Hide And Show Error – Artificial Intelligence

Answers