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JavaScript: URL Encode All Non-whitelisted Characters Using _ instead of %

Posted on 2013-11-06
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Last Modified: 2013-11-07
I want JavaScript functions that will work just like escape() and unescape() that use an underscore instead of a percent and encode all non-whitelisted charachters.

My function below does not work, as the example demonstrates:
http://jsfiddle.net/XVqeR/

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title>Demo</title>
</head>
<body>

<script type="text/javascript">
//<![CDATA[
// Thanks, leakim971
var x = 'A _test_ "1-2-3" 50%';
alert('The fist and last line should be the same:\n\n'+x+'\n'+escapeNonWhitelistedU(x)+'\n'+unescapeU(escapeNonWhitelistedU(x)));


function escapeNonWhitelistedU(str) {
    var escapechar = "%";
    var whitelist = "bcdefghijklmnopqrstuvwxyzBCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_";
    return str.replace(/(.)/g,function($1) { return whitelist.indexOf($1)<0?escapechar+$1.charCodeAt(0).toString(16):$1; });
}

function unescapeU(str) {
 return unescape(str.replace(/_/g,"%"));
}

//]]>
</script>
</body>
</html>

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Question by:hankknight
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LVL 82

Accepted Solution

by:
leakim971 earned 500 total points
ID: 39629164
your escape character CAN'T be in your whitelist else how to differentiate both?

the same way escape convert % to %25

you should use a char not in your whitelist so you know when you found it it's the escape char
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