Solved

AJAX + DOM (JavaScript) ClearText function

Posted on 2007-11-30
7
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Last Modified: 2013-11-19
I have a JavaScript function that removes all the child nodes of the specified element (el).

I use it this way:
ClearText(document.getElementById("item2"));

HTML looks like this:
<table>
<th>
<td>Header</td>
</th>

<span id="item1">
<tr>
<td>1</td>
</tr>
</span>

<span id="item2">
<tr>
<td>2</td>
</tr>
</span>

<span id="item3">
<tr>
<td>3</td>
</tr>
</span>

</table>

Function looks like this:

function ClearText(el)
{
    if (el != null)
    {
        if (el.childNodes)
        {
            for (var i = 0; i < el.childNodes.length; i++)
            {
                var childNode = el.childNodes[i];
                el.removeChild(childNode);
            }
        }
    }
}

Everything works well in IE7 but don't work in Firefox... what's wrong ??
0
Comment
Question by:mychel_normandeau
  • 5
  • 2
7 Comments
 
LVL 75

Expert Comment

by:Michel Plungjan
ID: 20382990
Perhaps because FF is standards compliant and does not view the row as a valid child of a span?
0
 
LVL 75

Expert Comment

by:Michel Plungjan
ID: 20383038
This works (notice the removed whitespace



<table border="1">

<th>

<td>Header</td>

</th>

<tr id="item1">

<td>1</td>

</tr>

<tr id="item2"><td>2</td></tr>

<tr id="item3">

<td>3</td>

</tr>

</table>
 

<script>

function ClearText(el)

{

    if (el != null)

    {

        if (el.childNodes)

        {

            for (var i = 0; i < el.childNodes.length; i++)

            {

                var childNode = el.childNodes[i];

                el.removeChild(childNode);

            }

        }

    }

}
 

ClearText(document.getElementById("item2"));

</script>

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0
 
LVL 75

Accepted Solution

by:
Michel Plungjan earned 500 total points
ID: 20383102
And one that ignores the whitespace

http://www.dustindiaz.com/easier-dom-walking-with-cleanwhitespace/


<table border="1">

<th>

<td>Header</td>

</th>

<tr id="item1">

<td>1</td>

</tr>

<tr id="item2">

<td>2</td>

</tr>

<tr id="item3">

<td>3</td>

</tr>

</span>
 

</table>
 

<script>
 

var notWhitespace = /\S/;

function cleanWhitespace(node) {

  for (var x = 0; x < node.childNodes.length; x++) {

    var childNode = node.childNodes[x]

    if ((childNode.nodeType == 3)&&(!notWhitespace.test(childNode.nodeValue))) {

// that is, if it's a whitespace text node

      node.removeChild(node.childNodes[x])

      x--

    }

    if (childNode.nodeType == 1) {

// elements can have text child nodes of their own

      cleanWhitespace(childNode)

    }

  }

}
 

function ClearText(el) {

  if (el != null &&  el.childNodes) {

    cleanWhitespace(el)

    for (var i = 0; i < el.childNodes.length; i++) {

      el.removeChild(el.childNodes[i]);

    }

  }

}
 

ClearText(document.getElementById("item2"));

</script>

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Author Comment

by:mychel_normandeau
ID: 20383121
mplungjan: what have you done exactly ? I removed the <span></span> and used the id on the <tr> instead, but still don't work...
0
 

Author Comment

by:mychel_normandeau
ID: 20383282
Ok, it "works with cleanWhitespace but it's not doing what i've expected... In my table I have many cols per row, and now it only delete the first one.

I want to clear the whole row...
0
 
LVL 75

Assisted Solution

by:Michel Plungjan
Michel Plungjan earned 500 total points
ID: 20387215
Delete or hide?




<script type="text/javascript">

function deleteRow(r)

{

var i=r.parentNode.parentNode.rowIndex;

document.getElementById('tb0').deleteRow(i);

}

</script>

<table id="tb0">

<tr id="tr0">

<td id="tc0">Row 0 cell 0</td>

<td id="tc1">Row 0 cell 1</td>

<td id="tc2">Row 0 cell 2</td>

</tr>

<tr id="tr1" onClick="this.style.display='none'">

<td id="tc0">Row 1 cell 0</td>

<td id="tc1">Row 1 cell 1</td>

<td id="tc2">Row 1 cell 2</td>

</tr>

<tr id="tr2" onClick="deleteRow(this)">

<td id="tc0">Row 2 cell 0</td>

<td id="tc1">Row 2 cell 1</td>

<td id="tc2">Row 2 cell 2</td>

</tr>

</table>

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0
 
LVL 75

Expert Comment

by:Michel Plungjan
ID: 20423112
Why a "B" ?
0

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