Encode And Decode entirety of Text or Html to '%xx' format

N

Newbie

How would I modify this form
to encode *all* the characters
in the 'source' textarea to the
'%xx' format & place result
code into the 'output' textarea?
(cross browser compatable)

Any help is appreciated.

Regards.

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Encode And Decode Entire Text or Html to '%xx' format
</title>
</head>
<body>
Text and Html "%xx" Converter<br>
<form name="form1" method="post" action="">
Original Text:<br>
<textarea name="source" cols="79" rows="8" wrap="VIRTUAL">Original Text or Html code
to have the *entirety* of
the characters converted
to '%xx' formated codes.
</textarea>
<br>
<br>
<br>
Output Text<br>
<textarea name="output" cols="79" rows="8" wrap="VIRTUAL"></textarea>
<br>
&nbsp;
<input type="button" name="Encode" value="Encode">
&nbsp;
<input type="button" name="Decode" value="Decode">
&nbsp;
<input name="reset" type="Reset" value="Reset">
</form>
</body>
</html>
 
G

Grant Wagner

Newbie said:
How would I modify this form
to encode *all* the characters
in the 'source' textarea to the
'%xx' format & place result
code into the 'output' textarea?
(cross browser compatable)

Any help is appreciated.

Regards.

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Encode And Decode Entire Text or Html to '%xx' format
</title>
</head>
<body>
Text and Html "%xx" Converter<br>
<form name="form1" method="post" action="">
Original Text:<br>
<textarea name="source" cols="79" rows="8" wrap="VIRTUAL">Original Text or Html code
to have the *entirety* of
the characters converted
to '%xx' formated codes.
</textarea>
<br>
<br>
<br>
Output Text<br>
<textarea name="output" cols="79" rows="8" wrap="VIRTUAL"></textarea>
<br>
&nbsp;
<input type="button" name="Encode" value="Encode">
&nbsp;
<input type="button" name="Decode" value="Decode">
&nbsp;
<input name="reset" type="Reset" value="Reset">
</form>
</body>
</html>
Click to expand...

<script type="text/javascript">
function encode(f) {
var ta = f.elements['source'].value;
var hex;
var s = [];
for (var i = 0; i < ta.length; i++) {
hex = (ta.charCodeAt(i) % 256).toString(16);
s.push((hex.length < 2 ? '0' : '') + hex);
}
f.elements['output'].value = '%' + (s.join('%')).toUpperCase();
}
function decode(f) {
var ta = f.elements['source'].value.split(/%/);
var s = [];
for (var i = 0; i < ta.length; i++) {
s.push(String.fromCharCode(parseInt(ta, 16)));
}
f.elements['output'].value = s.join('');
}
</script>

<input type="button" name="Encode" value="Encode" onclick="encode(this.form);">
<input type="button" name="Decode" value="Decode" onclick="decode(this.form);">

I hope I get a good mark from your teacher.
 
N

Newbie

| Newbie wrote:
|
| > How would I modify this form
| > to encode *all* the characters
| > in the 'source' textarea to the
| > '%xx' format & place result
| > code into the 'output' textarea?
| > (cross browser compatable)
| >
| > Any help is appreciated.
| >
| > Regards.

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Encode And Decode Entire Text or Html to '%xx' format
</title>
</head>
<body>
<script type="text/javascript">
<!--
function encode(f) {
var ta = f.elements['source'].value;
var hex;
var s = [];
for (var i = 0; i < ta.length; i++) {
hex = (ta.charCodeAt(i) % 256).toString(16);
s.push((hex.length < 2 ? '0' : '') + hex);
}
f.elements['output'].value = '%' + (s.join('%')).toUpperCase();
}
function decode(f) {
var ta = f.elements['source'].value.split(/%/);
var s = [];
for (var i = 0; i < ta.length; i++) {
s.push(String.fromCharCode(parseInt(ta, 16)));
}
f.elements['output'].value = s.join('');
}
//-->
</script>
Text and Html "%xx" Converter<br>
<form name="form1" method="post" action="">
Original Text:<br>
<textarea name="source" cols="79" rows="8" wrap="VIRTUAL">Original Text or Html code
to have the *entirety* of
the characters converted
to '%xx' formated codes.
</textarea>
<br>
<br>
<br>
Output Text<br>
<textarea name="output" cols="79" rows="8" wrap="VIRTUAL"></textarea>
<br>
&nbsp;
<input type="button" name="Encode" value="Encode" onclick="encode(this.form);">
&nbsp;
<input type="button" name="Decode" value="Decode" onclick="decode(this.form);">
&nbsp;
<input type="reset" name="Reset" value="Reset">
</form>
</body>
</html>

| I hope I get a good mark from your teacher.
|
| --
| Grant Wagner <[email protected]>
| comp.lang.javascript FAQ - http://jibbering.com/faq

I'm teaching myself & my teacher was really impressed :)

Thanks.

PS:
Will this work with 3.xx and 4.xx old JS enabled browsers too?
 
G

Grant Wagner

Newbie said:
<script type="text/javascript">
<!--
Click to expand...

<!-- not needed. Omit.
f.elements['output'].value = s.join('');
}
//-->
Click to expand...

//--> not needed. Omit.
PS:
Will this work with 3.xx and 4.xx old JS enabled browsers too?
Click to expand...

I would have said it'll work in almost any browser capable of JavaScript and forms, but I just discovered
that charCodeAt() wasn't implemented until JScript 5.5 <url:
http://msdn.microsoft.com/library/en-us/script56/html/js56jsoriversioninformation.asp />. That has to be a
typo. I can't believe Microsoft didn't implement the String#charCodeAt() method until version 5.5. Anyway,
assuming that MS URL is right, the code I provided will probably only work in Internet Explorer 5.5 and
higher, although it should work in Netscape versions as low as 3 <url:
http://devedge.netscape.com/library/manuals/2000/javascript/1.3/reference/string.html#1196647 />.

To make it work in versions of JScript older then 5.5, you'll have to add the following to your code:

if (!String.prototype.charCodeAt) {
String.prototype.charCodeAt = function (index) {
var charAt = this.charAt(index);
var i = 256;
while (i--) {
if (charAt == String.fromCharCode(i)) {
return i;
}
}
return 0;
}
}

Basically you're rolling your own String#charCodeAt() method that tests the character against each character
code from 255 to 0. I tested the method above for some simple cases, it seems to work correctly (until you
throw something like "String.fromCharCode(1027).charCodeAt2(0)" at it). Of course, if the browser is so old
that you have to use the above method definition, then it's likely it doesn't support unicode either. And
quite frankly, all the code I gave you assumes character codes in the range 0..255 (0x00..0xFF). Things would
be a bit more complicated if you allowed (0x0000..0xFFFF).
 
N

Newbie

| Newbie wrote:
|
| > <script type="text/javascript">
| > <!--
|
| <!-- not needed. Omit.
|
| > f.elements['output'].value = s.join('');
| > }
| > //-->
|
| //--> not needed. Omit.
|
| > PS:
| > Will this work with 3.xx and 4.xx old JS enabled browsers too?
|
| I would have said it'll work in almost any browser capable of JavaScript and forms, but I just discovered
| that charCodeAt() wasn't implemented until JScript 5.5 <url:
| http://msdn.microsoft.com/library/en-us/script56/html/js56jsoriversioninformation.asp />. That has to be a
| typo. I can't believe Microsoft didn't implement the String#charCodeAt() method until version 5.5. Anyway,
| assuming that MS URL is right, the code I provided will probably only work in Internet Explorer 5.5 and
| higher, although it should work in Netscape versions as low as 3 <url:
| http://devedge.netscape.com/library/manuals/2000/javascript/1.3/reference/string.html#1196647 />.
|
| To make it work in versions of JScript older then 5.5, you'll have to add the following to your code:
|
| if (!String.prototype.charCodeAt) {
| String.prototype.charCodeAt = function (index) {
| var charAt = this.charAt(index);
| var i = 256;
| while (i--) {
| if (charAt == String.fromCharCode(i)) {
| return i;
| }
| }
| return 0;
| }
| }
|
| Basically you're rolling your own String#charCodeAt() method that tests the character against each character
| code from 255 to 0. I tested the method above for some simple cases, it seems to work correctly (until you
| throw something like "String.fromCharCode(1027).charCodeAt2(0)" at it). Of course, if the browser is so old
| that you have to use the above method definition, then it's likely it doesn't support unicode either. And
| quite frankly, all the code I gave you assumes character codes in the range 0..255 (0x00..0xFF). Things would
| be a bit more complicated if you allowed (0x0000..0xFFFF).
|
| --
| Grant Wagner <[email protected]>
| comp.lang.javascript FAQ - http://jibbering.com/faq

Thanks again for all of your help.
It is greatly appreciated that you
have taken the time & even went
to the trouble of checking MS &
Netscape, which I did not expect.

Kindest Regards.

PS: My teacher thanks you also :)
 

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