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Es muy útil en el momento de enviar variables en una URL donde pueden aparecer carácteres no válidos que pueden dar errores.
<html><head>
<title>Untitled Document</title>
<script language="JavaScript">
var hexVals = new Array("0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F");
var unsafeString = ""%^[]`";
function highlight(element1){element1.focus();element1.select();}
function URLDecode()
{
var returnstr=unescape(form1.string1.value);
document.all.div1.innerHTML=`RESULT:<br><textarea name="textarea2">`+returnstr+`</textarea>`;
highlight(form3.textarea2);
// while coding i found that IE had problem writing `<form>` to innerhtml. </form> was ok. `unknown runtime error` IE5.5.
}
function URLEncode(val)
{
var state = `urlenc`;
var len = val.length;
var backlen = len;
var i = 0;
var newStr = "";
var frag = "";
var encval = "";
for (i=0;i<len;i++)
{
// uncomment the next 7 commented lines to encode only the usual URL unsafe characters
// if (isURLok(val.substring(i,i+1)))
// {
// newStr = newStr + val.substring(i,i+1);
// }
// else
// {
tval1=val.substring(i,i+1);
newStr = newStr + "%" + decToHex(tval1.charCodeAt(0),16);
// }
}
document.all.div1.innerHTML=`RESULT:<br><textarea name="textarea2">`+newStr+`</textarea>`;
highlight(form3.textarea2);
}
function decToHex(num, radix) // part of URL Encode
{
var hexString = "";
while (num >= radix)
{
temp = num % radix;
num = Math.floor(num / radix);
hexString += hexVals[temp];
}
hexString += hexVals[num];
return reversal(hexString);
}
function reversal(s) // part of URL Encode
{
var len = s.length;
var trans = "";
for (i=0; i<len; i++)
{
trans = trans + s.substring(len-i-1, len-i);
}
s = trans;
return s;
}
function isURLok(compareChar) // part of URL Encode
{
if (unsafeString.indexOf(compareChar) == -1 && compareChar.charCodeAt(0) > 32 && compareChar.charCodeAt(0) < 123)
{
return true;
}
else
{
return false;
}
}
</script>
</head>
<body>
<table align="center">
<tr>
<td align=center bgcolor="#FFFFFF"><form name="form1" onsubmit="URLDecode();return false;">
<font face="Verdana, Arial" size=2><b><u><big>URL Encode/Decode</big></u></b></font>
<br>
<textarea name="string1" cols="40" rows="8"></textarea>
<br>
<input type="button" value="Decode" onclick="URLDecode();">
<input type="button" value="Encode" onclick="URLEncode(form1.string1.value);">
</form>
<form name="form3">
<div align=center id="div1"></div>
</form></td>
</tr>
</table>
</body>
</html>
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