table.rows vs. table.getElemen tsByTagName (+ a regex question)

eBob.com

I am so frustrated. I've been working all weekend on what I thought would
be a simple script. I never find it easy to look at someone else's code,
but if someone can help with this I would be very grateful. The script is
....

<script type="text/javascript">
var parentwin = external.menuAr guments;
var doc = parentwin.docum ent;
var x = doc.getElements ByTagName("tabl e")
alert(x.length + " table things")
var re = /class='class_18 '>(\w+)<\/td>/

for (iv in x)
{
var tablerows = x[iv].rows
//alert(tablerows .length + " rows") // results in "'tablerows.len gth' is
// null or not an object ???????

//var tablerows2 = x[iv].getElementsByT agName("tr") // results in "Object
doesn't
// support this
property or method ??????

for (triv in tablerows)
{
alert("triv is \""+ triv + "\"; outerHTML:" +
tablerows[triv].outerHTML)

var marray = re.exec(tablero ws[triv].outerHTML)
//var marray = re.exec("<td align='center' class='class_18 '>Name</td>")
alert("marray is " + marray)
if (marray != null)
{ alert("match[0] " + marray[0])
alert("match[1] " + marray[1])
}
} // end of for (triv in tablerows)
} // end of for (iv in x)
</script>

And the HTML I am running it against is ...

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dt d">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<table cellpadding='0' cellspacing='0' border='0' align='center'>
<tr>
<td align='center' class='class_18 '>Name</td>
<td align='center' class='prl5 class_10'| </td>
<td align='center' class='class_19 '>4328-5352</td>
</tr>
</table>
</html>

1) Why can't I get the length of tablerows after the var tablerows =
x[iv].rows statement? I'm only interested in a one-row table, so I could
save some processing if I could get the length.

2) Why doesn't x[iv].getElementsByT agName("tr") work?

3) Why do I go through the loop for (triv in tablerows) twice when there
is only one row in the table? AND when I go through the loop the first time
the value of triv is "length" and the value of the outerHTML is "undefined" ?

4) Why doesn't the regular expression work when fed the outerHTML but does
when fed the text contained in the HTML?

It was a frustrating weekend and I will appreciate any help anyone can
offer. Thanks, Bob

Jun 27 '08 #1

Subscribe Reply

5328

Martin Honnen

eBob.com wrote:

I am so frustrated. I've been working all weekend on what I thought would
be a simple script. I never find it easy to look at someone else's code,
but if someone can help with this I would be very grateful. The script is
...

<script type="text/javascript">
var parentwin = external.menuAr guments;
var doc = parentwin.docum ent;
var x = doc.getElements ByTagName("tabl e")
alert(x.length + " table things")
var re = /class='class_18 '>(\w+)<\/td>/

for (iv in x)

x is a DOM node list, don't use for..in with that, use a for loop
for (var i = 0, l = x.length; i < l; i++)
{
var table = x[i];
}

for..in enumerates enumerable properties of an object and that is
usually not the right way to iterate over DOM collections.

--

Martin Honnen
http://JavaScript.FAQTs.com/

Jun 27 '08 #2

eBob.com

"eBob.com" <eB******@total lybogus.comwrot e in message
news:gQ******** *************@f e03.news.easyne ws.com...

>I am so frustrated. I've been working all weekend on what I thought would
be a simple script. I never find it easy to look at someone else's code,
but if someone can help with this I would be very grateful. The script is
...

<script type="text/javascript">
var parentwin = external.menuAr guments;
var doc = parentwin.docum ent;
var x = doc.getElements ByTagName("tabl e")
alert(x.length + " table things")
var re = /class='class_18 '>(\w+)<\/td>/

for (iv in x)
{
var tablerows = x[iv].rows
//alert(tablerows .length + " rows") // results in "'tablerows.len gth'
is
// null or not an object ???????

//var tablerows2 = x[iv].getElementsByT agName("tr") // results in
"Object doesn't
// support this
property or method ??????

for (triv in tablerows)
{
alert("triv is \""+ triv + "\"; outerHTML:" +
tablerows[triv].outerHTML)

var marray = re.exec(tablero ws[triv].outerHTML)
//var marray = re.exec("<td align='center'
class='class_18 '>Name</td>")
alert("marray is " + marray)
if (marray != null)
{ alert("match[0] " + marray[0])
alert("match[1] " + marray[1])
}
} // end of for (triv in tablerows)
} // end of for (iv in x)
</script>

And the HTML I am running it against is ...

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dt d">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<table cellpadding='0' cellspacing='0' border='0' align='center'>
<tr>
<td align='center' class='class_18 '>Name</td>
<td align='center' class='prl5 class_10'| </td>
<td align='center' class='class_19 '>4328-5352</td>
</tr>
</table>
</html>

1) Why can't I get the length of tablerows after the var tablerows =
x[iv].rows statement? I'm only interested in a one-row table, so I could
save some processing if I could get the length.

2) Why doesn't x[iv].getElementsByT agName("tr") work?

3) Why do I go through the loop for (triv in tablerows) twice when
there is only one row in the table? AND when I go through the loop the
first time the value of triv is "length" and the value of the outerHTML is
"undefined" ?

4) Why doesn't the regular expression work when fed the outerHTML but does
when fed the text contained in the HTML?

It was a frustrating weekend and I will appreciate any help anyone can
offer. Thanks, Bob

Sorry, I forgot to specify that I run the script under IE 6.0.

Jun 27 '08 #3

Thomas 'PointedEars' Lahn

[trimmed attribution novel]

eBob.com wrote:

"eBob.com" <eB******@total lybogus.comwrot e:
>var parentwin = external.menuAr guments;
[...]
for (iv in x)
>{
var tablerows = x[iv].rows
//alert(tablerows .length + " rows") // results in "'tablerows.len gth'
is
//var tablerows2 = x[iv].getElementsByT agName("tr") // results in
"Object doesn't
// support this
property or method ??????

As you can see by now at last, pre-commenting is much better than
post-commenting. Your Question Mark key is borken, BTW.

> for (triv in tablerows)
{
alert("triv is \""+ triv + "\"; outerHTML:" +
tablerows[triv].outerHTML)

This can be written less error-prone and easier legible:

window.alert('t riv is "' + triv + '";'
+ ' outerHTML: ' + tablerows[triv].outerHTML);

> var marray = re.exec(tablero ws[triv].outerHTML)

Why not String.prototyp e.match() instead?

> //var marray = re.exec("<td align='center'
class='class_1 8'>Name</td>")
[...]

Sorry, I forgot to specify that I run the script under IE 6.0.

I suppose one can guess that from your using the `external' property.

However, Martin's correct explanation still stands. Iteration over the
enumerable properties of a NodeList object for which the reference is
returned by document.getEle mentsByTagName( "table") yields the `length'
property as well in IE 6. And a number value if implicitly converted
into a Number object does not have a getElementsByTa gName() method.

Same with the NodeList object reference that tableRows evaluates to.
tableRows["length"] yields a number, and the Number object it is being
converted to does not have an outerHTML property. The result of the
expression therefore is `undefined', and literally "undefined" when
implicitly converted to string by RegExp.prototyp e.exec(). So your
Regular Expression can't find a match.

Please trim your quotes as recommended e.g. in the FAQ Notes.
PointedEars
--
Anyone who slaps a 'this page is best viewed with Browser X' label on
a Web page appears to be yearning for the bad old days, before the Web,
when you had very little chance of reading a document written on another
computer, another word processor, or another network. -- Tim Berners-Lee

Jun 27 '08 #4

eBob.com

Thank you very, VERY much Thomas and Martin! I would have struggled with
this problem for a long, long time without your help.

One loose end ... I have done some more research and learned about
Enumerators. I tried an Enumerator to step through the table rows and it
seems to work. Is there any practical difference between ...

for (var triv = 0, l = tablerows.lengt h; triv < l; triv++)

and ...

var enumTableRows = new Enumerator(tabl erows)
for (;!enumTableRow s.atEnd();enumT ableRows.moveNe xt())

?

Also, I discovered the problem with my regular expression. After an eyeball
tuneup I saw that document does quite a bit of massaging of the HTML. So my
regular expression, based on the original HTML, didn't have a chance of
working.

Thanks again for your very prompt and thorough help. Bob

Jun 27 '08 #5

Martin Honnen

eBob.com wrote:

One loose end ... I have done some more research and learned about
Enumerators. I tried an Enumerator to step through the table rows and it
seems to work. Is there any practical difference between ...

for (var triv = 0, l = tablerows.lengt h; triv < l; triv++)

and ...

var enumTableRows = new Enumerator(tabl erows)
for (;!enumTableRow s.atEnd();enumT ableRows.moveNe xt())

?

Enumerator is specific to Microsoft JScript, don't expect that to work
with other browsers or script engines.

--

Martin Honnen
http://JavaScript.FAQTs.com/

Jun 27 '08 #6

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