Question

Javascript Delete Row Problem

Asked by: johnny_32

I have a dynamic table with tr ids set as below as an example.
<Table name = "tblGrid">
<tr id=1>
    <Td></td>
</tr>
<tr id=2>
    <Td></td>
</tr>
<tr id=3>
    <Td></td>
</tr>
<tr id=4>
    <Td></td>
</tr>
</table>

I then have a array which determines which row ids need deleting  eg (1,2,3)

In order to do this i loop through the table rows. If the table row matches the array item to be deleted it is deleted. The problem is the table rows go out of synch once it  is deleted.

For example :
Looping through array(1,2,3)
Array item 1

TR 1       ArrayItem(1)        TR1 equals ArrayItem(1)   so delete Row 1
TR 2
TR 3
TR 4

Array item 2  I want to delete TR(2) but the loop now counts to TR3 as this is the 2nd item in the loop

TR 2      
TR 3
TR 4

In example here table has 4 TRs as above 
 
 
var flr = document.getElementById('tblGrid');
                var  count = flr.rows.length;
                            for (var i = 0; i < count; i++) {
                  
                                for (iTem = 0; iTem < loopIds.length; iTem++) {
 
                                    if (i > 0 ) { // dont want table header row
                                             if (loopIds[iTem] == i) {
                                            var flr2 = document.getElementById('tblGrid');
                                            IDval = parseInt(flr.rows[i].id, 0);
                                                                              
                                            document.all.tblGrid.deleteRow(IDval);
                                         }
                                     }
                                 }
                                
                                
                         }

                                  
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Asked On
2009-03-16 at 06:08:30ID24233589
Topics

Document Object Model

,

JavaScript

Participating Experts
3
Points
0
Comments
4

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Answers

 

by: HonorGodPosted on 2009-03-16 at 06:11:48ID: 23897260

Remember that indexing is zero origin.
The 1st row is row[ 0 ], etc.

 

by: fsze88Posted on 2009-03-16 at 06:33:45ID: 23897478

like this?

<table id="tblGrid">
<tr><td>abc</td></tr>
<tr><td>def</td></tr>
<tr><td>ijk</td></tr>
</table>
 
 
 
 
<script type="text/javascript">
 
function removeTr(tableid,removeIndex){
var flr = document.getElementById(tableid);
var  childs = flr.rows;
flr.deleteRow( removeIndex );
}
 
removeTr('tblGrid',1);
</script>
                                              
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by: pravinasarPosted on 2009-03-17 at 14:36:43ID: 23913437

Here is a complete example for you.  Works with IE/FF

Hope this works for you.

<tr> is a child of <tbody>


<html>
<head>
<title>Delete Row From a Table - Pravin Asar</title>
<style type="text/css">
</style>
<script language="javascript">

function DeleteRowFromTable(tableId, rowId) {    
    var table = document.getElementById(tableId);
    if (!table) { return ; }
    var tbody = table.getElementsByTagName('tbody');
    if (!tbody) { return; }
    var delRow   = document.getElementById(rowId);
    alert ('Deleting Row ID: ' + delRow.id);
    if (!delRow) { return; }
    tbody[0].removeChild(delRow);
}
</script>
</head>
<body>

<table id= "tblGrid">
<tr id="1">
    <Td>Row1 Cell1</td>
    <Td>Row1 Cell2</td>
    <Td>Row1 Cell3</td>
    <Td><a href="#" onclick="DeleteRowFromTable('tblGrid', '1'); return false;">Delete Row ID=1</a></Td>
</tr>
<tr id="2">
    <Td>Row2 Cell1</td>
    <Td>Row2 Cell2</td>
    <Td>Row2 Cell3</td>
    <Td><a href="#" onclick="DeleteRowFromTable('tblGrid', '2'); return false;">Delete Row ID=2</a></Td>
</tr>
<tr id="3">
    <Td>Row3 Cell1</td>
    <Td>Row3 Cell2</td>
    <Td>Row3 Cell3</td>
    <Td><a href="#" onclick="DeleteRowFromTable('tblGrid', '3'); return false;">Delete Row ID=3</a></Td>
</tr>
<tr id="4">
    <Td>Row4 Cell1</td>
    <Td>Row4 Cell2</td>
    <Td>Row4 Cell3</td>
    <Td><a href="#" onclick="DeleteRowFromTable('tblGrid', '4'); return false;">Delete Row ID=4</a></Td>
</tr>
</table>
</body>
</html>

 

by: johnny_32Posted on 2009-03-18 at 10:29:12ID: 23921222

I managed to fix this myself

The trick is to create an array of row ids before you loop through the table deleting rows.  Then you can loop through this array deleting rows not worrying about the ids going out of synch

 // create array of row ids to delete
               var ids = "";
               var tbl = document.getElementById('tblGrid');
               var lastRow = tbl.rows.length - 1;

               for (i = 0; i < lastRow; i++) {
                   if (i > 0) {
                       IDval = parseInt(tbl.rows[i].id, 0);
                       ids = ids + "," + IDval;      
                   }
               }

20120131-EE-VQP-002

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