No Duplicates Script

[Papajo]

I,m looking for a script to remove duplicates email addresses from a
list, the addresses will be displayed one per line in a textarea. The
script will be used on a simple webtv browser. Thanks Joe

[Grant Wagner]

"Papajo" <do*****@webtv.net> wrote in message
news:75***************@storefull-3331.bay.webtv.net...

I,m looking for a script to remove duplicates email addresses from a
list, the addresses will be displayed one per line in a textarea. The
script will be used on a simple webtv browser. Thanks Joe

It's unlikely you'll find any generic script to do this, but it should
be simple enough to write something yourself that does this.

<form name="testForm">
<textarea name="testTextarea" rows="10">
ab*@def.com
de*@ghi.com
gh*@jkl.com
ab*@def.com
jk*@mno.com
mn*@pqr.com
gh*@jkl.com
pq*@stu.com
st*@vwx.com
ab*@def.com
</textarea>
<input type="button" name="testButton" value="Remove duplicates"
onclick="removeDuplicateLines(this.form['testTextarea']);">
</form>
<script type="text/javascript">
function removeDuplicateLines(ta) {
var lines = ta.value.replace(/\r/g, '\n').split(/\n+/);
var addresses = {};
for (var ii = 0; ii < lines.length; ++ii) {
if (addresses[lines[ii]]) {
lines.splice(ii, 1);
} else {
addresses[lines[ii]] = true;
}
}
ta.value = lines.join('\n');
}
</script>

_Appears_ to work, but not fully tested. Also, if the E-mail addresses
differ in any way (case, extra whitespace at the beginning or end) this
function will not detect them as duplicates.

--
Grant Wagner <gw*****@agricoreunited.com>
comp.lang.javascript FAQ - http://jibbering.com/faq

[Grant Wagner]

"Grant Wagner" <gw*****@agricoreunited.com> wrote in message
news:03*************@news2.mts.net...

"Papajo" <do*****@webtv.net> wrote in message
news:75***************@storefull-3331.bay.webtv.net...

I,m looking for a script to remove duplicates email addresses from a
list, the addresses will be displayed one per line in a textarea. The
script will be used on a simple webtv browser. Thanks Joe

It's unlikely you'll find any generic script to do this, but it should
be simple enough to write something yourself that does this.

<form name="testForm">
<textarea name="testTextarea" rows="10">
ab*@def.com
de*@ghi.com
gh*@jkl.com
ab*@def.com
jk*@mno.com
mn*@pqr.com
gh*@jkl.com
pq*@stu.com
st*@vwx.com
ab*@def.com
</textarea>
<input type="button" name="testButton" value="Remove duplicates"
onclick="removeDuplicateLines(this.form['testTextarea']);">
</form>
<script type="text/javascript">
function removeDuplicateLines(ta) {
var lines = ta.value.replace(/\r/g, '\n').split(/\n+/);
var addresses = {};
for (var ii = 0; ii < lines.length; ++ii) {
if (addresses[lines[ii]]) {
lines.splice(ii, 1);
} else {
addresses[lines[ii]] = true;
}

Oops, should probably be:

var ii = 0;
while (ii < lines.length) {
if (addresses[lines[ii]]) {
lines.splice(ii, 1);
} else {
addresses[lines[ii]] = true;
++ii;
}
}

Still not fully tested, I'm not sure what happens when all the items in
the list are duplicates of each other for example.

--
Grant Wagner <gw*****@agricoreunited.com>
comp.lang.javascript FAQ - http://jibbering.com/faq

[Dr John Stockton]

JRS: In article <75***************@storefull-3331.bay.webtv.net>, dated
Fri, 10 Jun 2005 17:35:37, seen in news:comp.lang.javascript, Papajo
<do*****@webtv.net> posted :

I,m looking for a script to remove duplicates email addresses from a
list, the addresses will be displayed one per line in a textarea. The
script will be used on a simple webtv browser. Thanks Joe

I know little of WebTV, but the obvious way would be :-

(1) Tidy the entries, if applicable, by removing such as leading or
trailing whitespace.

(2) Split the textarea at newlines

(3) Sort

(4) Scan, copying to a new list only those differing from their
predecessor.

The following was written in a textarea F.Code (in js-quick.htm), and
eval() was applied to F.Code.value; the result looked as required.

// aaa
// ccc
var Y = [], Last, Z, j, X = F.Code.value.split(/[\r\n]+/).sort()
for (j=0; j<X.length; j++) if (Last!=X[j]) Y[Y.length] = Last = X[j]
// aaa
Y = Y.join("\n")
F.Code.value=Y

Note that the non-comment lines are in alphabetical order, so that the
code does not rearrange itself.

--
© John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v4.00 IE 4 ©
<URL:http://www.jibbering.com/faq/> JL/RC: FAQ of news:comp.lang.javascript
<URL:http://www.merlyn.demon.co.uk/js-index.htm> jscr maths, dates, sources.
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[Papajo]

Thank you for your help but webtv doesn't support either of the examples
you came up with, webtv has a lot of limitations.
Joe

[Thomas 'PointedEars' Lahn]

Papajo wrote:

Thank you for your help but webtv doesn't support either of the
examples you came up with, webtv has a lot of limitations.

Why did not you say that in the first place? And what part(s) of
the presented scripts do(es) not work (and how don't they), exactly?
PointedEars