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Get the ID of each tr in a table?

Posted on 2007-12-06
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Last Modified: 2013-11-19
OK so what i have is an xhtml page, on this page is a table with several rows, each <tr> has in id.  So what i want to do is write a peice of javascript which will get the id of each <tr> in the table and then run this function to hide the specific id rows:

    function toggle_visibility(id) {
       var e = document.getElementById(id);
       if(e.style.display == 'block')
          e.style.display = 'none';
       else
          e.style.display = 'block';
    }


e.g.

for each tr in the table id="tabel1"
      get the id
      run the  function toggle_visibility function with the current id

thought i im confused as to how to do this?

Gary
0
Comment
Question by:Rocker4500
9 Comments
 
LVL 82

Expert Comment

by:hielo
ID: 20421099
You can retrieve all the tr elements first, and then get their ids:
var trList = document.getElementsByTagName("tr");
if(trList)
 for(var i=0; i<trList.length;++i)
 {
  if(trList.id)
  {
    //alert(trList[i].id);
   toggleVisibility(trList[i].id);
  }
 }
0
 
LVL 82

Expert Comment

by:hielo
ID: 20421108
Typo spotted. Should have been:
 if(trList[i].id)
0
 
LVL 29

Expert Comment

by:Badotz
ID: 20421199
For a specific table:

var td_list = document.getElementById('YOUR_TABLE_NAME').getElementsByTagName('TR');
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LVL 1

Author Comment

by:Rocker4500
ID: 20421218
Ok so i now have:

function hide()
{
var trList = document.getElementsByTagName("tr");
if(trList)
 for(var i=0; i<trList.length;++i)
 {
  if(trList[i].id)
  {
    //alert(trList[i].id);
   toggle_visibility(trList[i].id);
  }
 }

}

    function toggle_visibility(id) {
       var e = document.getElementById(id);
       if(e.style.display == 'block')
          e.style.display = 'none';
       else
          e.style.display = 'block';
    }

which i put in the <body onload="hide();">

But this dosnt seem to work


if i was using badotz suggestion would it now be:

function hide()
{
var tr_list = document.getElementById('YOUR_TABLE_NAME').getElementsByTagName('TR');
if(tr_list)
 for(var i=0; i<tr_list.length;++i)
 {
  if(tr_list[i].id)
  {
    //alert(tr_list[i].id);
   toggle_visibility(tr_list[i].id);
  }
 }

}

    function toggle_visibility(id) {
       var e = document.getElementById(id);
       if(e.style.display == 'block')
          e.style.display = 'none';
       else
          e.style.display = 'block';
    }
0
 
LVL 82

Expert Comment

by:hielo
ID: 20421257
Try using this:
function toggle_visibility(id) {
       var e = document.getElementById(id);
       if(e.style.display != 'none')
          e.style.display = 'none';
       else
          e.style.display = '';
    }
0
 
LVL 29

Expert Comment

by:Badotz
ID: 20421294
Change 'YOUR_TABLE_NAME' to the ID of your table, obviously...

Also, I would use this:

 for(var i=0; i<tr_list.length;i++)

instead of this:

 for(var i=0; i<tr_list.length;++i)
0
 
LVL 82

Accepted Solution

by:
hielo earned 30 total points
ID: 20421581
The following example does what you want. NOTE: the second row is initially hidden.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<style type="text/css">
<!--
.hide{display:none;}

-->
</style>

</head>
<body>
<script type="text/javascript">
function toggle_visibility(id) {

       var e = document.getElementById(id);
       if(e.className == 'hide')
          e.className = '';
       else
          e.className = 'hide';
    }
   
function toggleTable(tableName)
{
      var trList = document.getElementById(tableName).getElementsByTagName("tr");
      if(trList)
       for(var i=0; i<trList.length;++i)
       {
        if(trList[i].id)
        {
               toggle_visibility(trList[i].id);
         }
 }

}

</script>
<table id="myData">
      <tr id="a"><td>A</td></tr>
      <tr id="b" class="hide"><td>B</td></tr>
      <tr id="c"><td>C</td></tr>
</table>
<input type="button" onclick="toggleTable('myData')" value="Toggle"/>
</body>
</html>
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Expert Comment

by:Computer101
ID: 20953164
Forced accept.

Computer101
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