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function URLEncode(plaintext){
// The Javascript escape and unescape functions do not correspond
// with what browsers actually do...
var SAFECHARS = "0123456789" + // Numeric
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" + // Alphabetic
"abcdefghijklmnopqrstuvwxyz" +
"-_.!~*'()"; // RFC2396 Mark characters
var HEX = "0123456789ABCDEF";

var encoded = "";
for (var i = 0; i < plaintext.length; i++ ) {
var ch = plaintext.charAt(i);
if (ch == " ") {
encoded += "+"; // x-www-urlencoded, rather than %20
} else if (SAFECHARS.indexOf(ch) != -1) {
encoded += ch;
} else {
var charCode = ch.charCodeAt(0);
if (charCode > 255) {
alert("Unicode Character '"
+ ch
+ "' cannot be encoded using standard URL encoding.\n" +
"(URL encoding only supports 8-bit characters.)\n" +
"A space (+) will be substituted.");
encoded += "+";
} else {
encoded += "%";
encoded += HEX.charAt((charCode >> 4) & 0xF);
encoded += HEX.charAt(charCode & 0xF);
}
}
} // for

return encoded;

}

<p>code {
margin: 5px 0;
padding: 10px;
text-align: left;
display: block;
overflow: auto; 
font: 500 1em/1.5em 'Lucida Console', 'courier new', monospace;
/* white-space: pre; */
background: #FAFAFA;
border: 1px solid #f2f2f2; 
border-left: 3px solid #72A545;
}</p>
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