Skip to content

Instantly share code, notes, and snippets.

@jeremysimmons

jeremysimmons/HtmlDecode.js

Created May 10, 2017 19:49
Show Gist options

  • Select an option

    Learn more about clone URLs
  • Save jeremysimmons/c97de162ecf15c288d81107d3a050eb3 to your computer and use it in GitHub Desktop.

Select an option

Learn more about clone URLs
Save jeremysimmons/c97de162ecf15c288d81107d3a050eb3 to your computer and use it in GitHub Desktop.
Download ZIP
Raw
HtmlDecode.js
// plementation, here's a rendition of Server.HtmlDecode in Javascript
// HtmlDecode http://lab.msdn.microsoft.com/annotations/htmldecode.js
// client side version of the useful Server.HtmlDecode method
// takes one string (encoded) and returns another (decoded)
function HtmlDecode(s) {
var out = "";
if (s == null) return;
var l = s.length;
for (var i=0; i<l; i++) {
var ch = s.charAt(i);
if (ch == '&') {
var semicolonIndex = s.indexOf(';', i+1);
if (semicolonIndex > 0) {
var entity = s.substring(i + 1, semicolonIndex);
if (entity.length > 1 && entity.charAt(0) == '#') {
if (entity.charAt(1) == 'x' || entity.charAt(1) == 'X')
ch = String.fromCharCode(eval('0'+entity.substring(1)));
else
ch = String.fromCharCode(eval(entity.substring(1)));
}
else {
switch (entity) {
case 'quot': ch = String.fromCharCode(0x0022); break;
case 'amp': ch = String.fromCharCode(0x0026); break;
case 'lt': ch = String.fromCharCode(0x003c); break;
case 'gt': ch = String.fromCharCode(0x003e); break;
case 'nbsp': ch = String.fromCharCode(0x00a0); break;
case 'iexcl': ch = String.fromCharCode(0x00a1); break;
case 'cent': ch = String.fromCharCode(0x00a2); break;
case 'pound': ch = String.fromCharCode(0x00a3); break;
case 'curren': ch = String.fromCharCode(0x00a4); break;
case 'yen': ch = String.fromCharCode(0x00a5); break;
case 'brvbar': ch = String.fromCharCode(0x00a6); break;
case 'sect': ch = String.fromCharCode(0x00a7); break;
case 'uml': ch = String.fromCharCode(0x00a8); break;
case 'copy': ch = String.fromCharCode(0x00a9); break;
case 'ordf': ch = String.fromCharCode(0x00aa); break;
case 'laquo': ch = String.fromCharCode(0x00ab); break;
case 'not': ch = String.fromCharCode(0x00ac); break;
case 'shy': ch = String.fromCharCode(0x00ad); break;
case 'reg': ch = String.fromCharCode(0x00ae); break;
case 'macr': ch = String.fromCharCode(0x00af); break;
case 'deg': ch = String.fromCharCode(0x00b0); break;
case 'plusmn': ch = String.fromCharCode(0x00b1); break;
case 'sup2': ch = String.fromCharCode(0x00b2); break;
case 'sup3': ch = String.fromCharCode(0x00b3); break;
case 'acute': ch = String.fromCharCode(0x00b4); break;
case 'micro': ch = String.fromCharCode(0x00b5); break;
case 'para': ch = String.fromCharCode(0x00b6); break;
case 'middot': ch = String.fromCharCode(0x00b7); break;
case 'cedil': ch = String.fromCharCode(0x00b8); break;
case 'sup1': ch = String.fromCharCode(0x00b9); break;
case 'ordm': ch = String.fromCharCode(0x00ba); break;
case 'raquo': ch = String.fromCharCode(0x00bb); break;
case 'frac14': ch = String.fromCharCode(0x00bc); break;
case 'frac12': ch = String.fromCharCode(0x00bd); break;
case 'frac34': ch = String.fromCharCode(0x00be); break;
case 'iquest': ch = String.fromCharCode(0x00bf); break;
case 'Agrave': ch = String.fromCharCode(0x00c0); break;
case 'Aacute': ch = String.fromCharCode(0x00c1); break;
case 'Acirc': ch = String.fromCharCode(0x00c2); break;
case 'Atilde': ch = String.fromCharCode(0x00c3); break;
case 'Auml': ch = String.fromCharCode(0x00c4); break;
case 'Aring': ch = String.fromCharCode(0x00c5); break;
case 'AElig': ch = String.fromCharCode(0x00c6); break;
case 'Ccedil': ch = String.fromCharCode(0x00c7); break;
case 'Egrave': ch = String.fromCharCode(0x00c8); break;
case 'Eacute':ch = String.fromCharCode(0x00c9); break;
case 'Ecirc':ch = String.fromCharCode(0x00ca); break;
case 'Euml':ch = String.fromCharCode(0x00cb); break;
case 'Igrave':ch = String.fromCharCode(0x00cc); break;
case 'Iacute':ch = String.fromCharCode(0x00cd); break;
case 'Icirc':ch = String.fromCharCode(0x00ce); break;
case 'Iuml':ch = String.fromCharCode(0x00cf); break;
case 'ETH':ch = String.fromCharCode(0x00d0); break;
case 'Ntilde':ch = String.fromCharCode(0x00d1); break;
case 'Ograve':ch = String.fromCharCode(0x00d2); break;
case 'Oacute':ch = String.fromCharCode(0x00d3); break;
case 'Ocirc':ch = String.fromCharCode(0x00d4); break;
case 'Otilde':ch = String.fromCharCode(0x00d5); break;
case 'Ouml':ch = String.fromCharCode(0x00d6); break;
case 'times':ch = String.fromCharCode(0x00d7); break;
case 'Oslash':ch = String.fromCharCode(0x00d8); break;
case 'Ugrave':ch = String.fromCharCode(0x00d9); break;
case 'Uacute':ch = String.fromCharCode(0x00da); break;
case 'Ucirc':ch = String.fromCharCode(0x00db); break;
case 'Uuml':ch = String.fromCharCode(0x00dc); break;
case 'Yacute':ch = String.fromCharCode(0x00dd); break;
case 'THORN':ch = String.fromCharCode(0x00de); break;
case 'szlig':ch = String.fromCharCode(0x00df); break;
case 'agrave':ch = String.fromCharCode(0x00e0); break;
case 'aacute':ch = String.fromCharCode(0x00e1); break;
case 'acirc':ch = String.fromCharCode(0x00e2); break;
case 'atilde':ch = String.fromCharCode(0x00e3); break;
case 'auml':ch = String.fromCharCode(0x00e4); break;
case 'aring':ch = String.fromCharCode(0x00e5); break;
case 'aelig':ch = String.fromCharCode(0x00e6); break;
case 'ccedil':ch = String.fromCharCode(0x00e7); break;
case 'egrave':ch = String.fromCharCode(0x00e8); break;
case 'eacute':ch = String.fromCharCode(0x00e9); break;
case 'ecirc':ch = String.fromCharCode(0x00ea); break;
case 'euml':ch = String.fromCharCode(0x00eb); break;
case 'igrave':ch = String.fromCharCode(0x00ec); break;
case 'iacute':ch = String.fromCharCode(0x00ed); break;
case 'icirc':ch = String.fromCharCode(0x00ee); break;
case 'iuml':ch = String.fromCharCode(0x00ef); break;
case 'eth'ch = String.fromCharCode(0x00f0); break;
case 'ntilde'ch = String.fromCharCode(0x00f1); break;
case 'ograve'ch = String.fromCharCode(0x00f2); break;
case 'oacute'ch = String.fromCharCode(0x00f3); break;
case 'ocirc'ch = String.fromCharCode(0x00f4); break;
case 'otilde'ch = String.fromCharCode(0x00f5); break;
case 'ouml'ch = String.fromCharCode(0x00f6); break;
case 'divide'ch = String.fromCharCode(0x00f7); break;
case 'oslash'ch = String.fromCharCode(0x00f8); break;
case 'ugrave'ch = String.fromCharCode(0x00f9); break;
case 'uacute'ch = String.fromCharCode(0x00fa); break;
case 'ucirc'ch = String.fromCharCode(0x00fb); break;
case 'uuml'ch = String.fromCharCode(0x00fc); break;
case 'yacute'ch = String.fromCharCode(0x00fd); break;
case 'thorn'ch = String.fromCharCode(0x00fe); break;
case 'yuml'ch = String.fromCharCode(0x00ff); break;
case 'OElig'ch = String.fromCharCode(0x0152); break;
case 'oelig'ch = String.fromCharCode(0x0153); break;
case 'Scaron'ch = String.fromCharCode(0x0160); break;
case 'scaron'ch = String.fromCharCode(0x0161); break;
case 'Yuml'ch = String.fromCharCode(0x0178); break;
case 'fnof'ch = String.fromCharCode(0x0192); break;
case 'circ'ch = String.fromCharCode(0x02c6); break;
case 'tilde'ch = String.fromCharCode(0x02dc); break;
case 'Alpha'ch = String.fromCharCode(0x0391); break;
case 'Beta'ch = String.fromCharCode(0x0392); break;
case 'Gamma'ch = String.fromCharCode(0x0393); break;
case 'Delta'ch = String.fromCharCode(0x0394); break;
case 'Epsilon'ch = String.fromCharCode(0x0395); break;
case 'Zeta'ch = String.fromCharCode(0x0396); break;
case 'Eta'ch = String.fromCharCode(0x0397); break;
case 'Theta'ch = String.fromCharCode(0x0398); break;
case 'Iota'ch = String.fromCharCode(0x0399); break;
case 'Kappa'ch = String.fromCharCode(0x039a); break;
case 'Lambda'ch = String.fromCharCode(0x039b); break;
case 'Mu'ch = String.fromCharCode(0x039c); break;
case 'Nu'ch = String.fromCharCode(0x039d); break;
case 'Xi'ch = String.fromCharCode(0x039e); break;
case 'Omicron'ch = String.fromCharCode(0x039f); break;
case 'Pi'ch = String.fromCharCode(0x03a0); break;
case 'Rho': ch = String.fromCharCode(0x03a1); break;
case 'Sigma':ch = String.fromCharCode(0x03a3); break;
case 'Tau'ch = String.fromCharCode(0x03a4); break;
case 'Upsilon'ch = String.fromCharCode(0x03a5); break;
case 'Phi'ch = String.fromCharCode(0x03a6); break;
case 'Chi'ch = String.fromCharCode(0x03a7); break;
case 'Psi'ch = String.fromCharCode(0x03a8); break;
case 'Omega'ch = String.fromCharCode(0x03a9); break;
case 'alpha'ch = String.fromCharCode(0x03b1); break;
case 'beta'ch = String.fromCharCode(0x03b2); break;
case 'gamma'ch = String.fromCharCode(0x03b3); break;
case 'delta'ch = String.fromCharCode(0x03b4); break;
case 'epsilon'ch = String.fromCharCode(0x03b5); break;
case 'zeta'ch = String.fromCharCode(0x03b6); break;
case 'eta'ch = String.fromCharCode(0x03b7); break;
case 'theta'ch = String.fromCharCode(0x03b8); break;
case 'iota'ch = String.fromCharCode(0x03b9); break;
case 'kappa'ch = String.fromCharCode(0x03ba); break;
case 'lambda'ch = String.fromCharCode(0x03bb); break;
case 'mu'ch = String.fromCharCode(0x03bc); break;
case 'nu'ch = String.fromCharCode(0x03bd); break;
case 'xi'ch = String.fromCharCode(0x03be); break;
case 'omicron'ch = String.fromCharCode(0x03bf); break;
case 'pi'ch = String.fromCharCode(0x03c0); break;
case 'rho'ch = String.fromCharCode(0x03c1); break;
case 'sigmaf'ch = String.fromCharCode(0x03c2); break;
case 'sigma'ch = String.fromCharCode(0x03c3); break;
case 'tau'ch = String.fromCharCode(0x03c4); break;
case 'upsilon'ch = String.fromCharCode(0x03c5); break;
case 'phi'ch = String.fromCharCode(0x03c6); break;
case 'chi'ch = String.fromCharCode(0x03c7); break;
case 'psi'ch = String.fromCharCode(0x03c8); break;
case 'omega'ch = String.fromCharCode(0x03c9); break;
case 'thetasym'ch = String.fromCharCode(0x03d1); break;
case 'upsih'ch = String.fromCharCode(0x03d2); break;
case 'piv'ch = String.fromCharCode(0x03d6); break;
case 'ensp'ch = String.fromCharCode(0x2002); break;
case 'emsp'ch = String.fromCharCode(0x2003); break;
case 'thinsp'ch = String.fromCharCode(0x2009); break;
case 'zwnj'ch = String.fromCharCode(0x200c); break;
case 'zwj'ch = String.fromCharCode(0x200d); break;
case 'lrm'ch = String.fromCharCode(0x200e); break;
case 'rlm'ch = String.fromCharCode(0x200f); break;
case 'ndash'ch = String.fromCharCode(0x2013); break;
case 'mdash'ch = String.fromCharCode(0x2014); break;
case 'lsquo'ch = String.fromCharCode(0x2018); break;
case 'rsquo'ch = String.fromCharCode(0x2019); break;
case 'sbquo'ch = String.fromCharCode(0x201a); break;
case 'ldquo'ch = String.fromCharCode(0x201c); break;
case 'rdquo'ch = String.fromCharCode(0x201d); break;
case 'bdquo'ch = String.fromCharCode(0x201e); break;
case 'dagger'ch = String.fromCharCode(0x2020); break;
case 'Dagger'ch = String.fromCharCode(0x2021); break;
case 'bull'ch = String.fromCharCode(0x2022); break;
case 'hellip'ch = String.fromCharCode(0x2026); break;
case 'permil'ch = String.fromCharCode(0x2030); break;
case 'prime'ch = String.fromCharCode(0x2032); break;
case 'Prime'ch = String.fromCharCode(0x2033); break;
case 'lsaquo'ch = String.fromCharCode(0x2039); break;
case 'rsaquo'ch = String.fromCharCode(0x203a); break;
case 'oline'ch = String.fromCharCode(0x203e); break;
case 'frasl'ch = String.fromCharCode(0x2044); break;
case 'euro'ch = String.fromCharCode(0x20ac); break;
case 'image'ch = String.fromCharCode(0x2111); break;
case 'weierp'ch = String.fromCharCode(0x2118); break;
case 'real'ch = String.fromCharCode(0x211c); break;
case 'trade'ch = String.fromCharCode(0x2122); break;
case 'alefsym'ch = String.fromCharCode(0x2135); break;
case 'larr'ch = String.fromCharCode(0x2190); break;
case 'uarr'ch = String.fromCharCode(0x2191); break;
case 'rarr'ch = String.fromCharCode(0x2192); break;
case 'darr'ch = String.fromCharCode(0x2193); break;
case 'harr'ch = String.fromCharCode(0x2194); break;
case 'crarr'ch = String.fromCharCode(0x21b5); break;
case 'lArr'ch = String.fromCharCode(0x21d0); break;
case 'uArr'ch = String.fromCharCode(0x21d1); break;
case 'rArr'ch = String.fromCharCode(0x21d2); break;
case 'dArr'ch = String.fromCharCode(0x21d3); break;
case 'hArr'ch = String.fromCharCode(0x21d4); break;
case 'forall'ch = String.fromCharCode(0x2200); break;
case 'part'ch = String.fromCharCode(0x2202); break;
case 'exist'ch = String.fromCharCode(0x2203); break;
case 'empty'ch = String.fromCharCode(0x2205); break;
case 'nabla'ch = String.fromCharCode(0x2207); break;
case 'isin'ch = String.fromCharCode(0x2208); break;
case 'notin'ch = String.fromCharCode(0x2209); break;
case 'ni'ch = String.fromCharCode(0x220b); break;
case 'prod'ch = String.fromCharCode(0x220f); break;
case 'sum'ch = String.fromCharCode(0x2211); break;
case 'minus'ch = String.fromCharCode(0x2212); break;
case 'lowast'ch = String.fromCharCode(0x2217); break;
case 'radic'ch = String.fromCharCode(0x221a); break;
case 'prop'ch = String.fromCharCode(0x221d); break;
case 'infin'ch = String.fromCharCode(0x221e); break;
case 'ang'ch = String.fromCharCode(0x2220); break;
case 'and'ch = String.fromCharCode(0x2227); break;
case 'or'ch = String.fromCharCode(0x2228); break;
case 'cap'ch = String.fromCharCode(0x2229); break;
case 'cup'ch = String.fromCharCode(0x222a); break;
case 'int'ch = String.fromCharCode(0x222b); break;
case 'there4'ch = String.fromCharCode(0x2234); break;
case 'sim'ch = String.fromCharCode(0x223c); break;
case 'cong'ch = String.fromCharCode(0x2245); break;
case 'asymp'ch = String.fromCharCode(0x2248); break;
case 'ne'ch = String.fromCharCode(0x2260); break;
case 'equiv'ch = String.fromCharCode(0x2261); break;
case 'le'ch = String.fromCharCode(0x2264); break;
case 'ge'ch = String.fromCharCode(0x2265); break;
case 'sub'ch = String.fromCharCode(0x2282); break;
case 'sup'ch = String.fromCharCode(0x2283); break;
case 'nsub'ch = String.fromCharCode(0x2284); break;
case 'sube'ch = String.fromCharCode(0x2286); break;
case 'supe'ch = String.fromCharCode(0x2287); break;
case 'oplus'ch = String.fromCharCode(0x2295); break;
case 'otimes'ch = String.fromCharCode(0x2297); break;
case 'perp'ch = String.fromCharCode(0x22a5); break;
case 'sdot'ch = String.fromCharCode(0x22c5); break;
case 'lceil'ch = String.fromCharCode(0x2308); break;
case 'rceil'ch = String.fromCharCode(0x2309); break;
case 'lfloor'ch = String.fromCharCode(0x230a); break;
case 'rfloor'ch = String.fromCharCode(0x230b); break;
case 'lang'ch = String.fromCharCode(0x2329); break;
case 'rang'ch = String.fromCharCode(0x232a); break;
case 'loz'ch = String.fromCharCode(0x25ca); break;
case 'spades'ch = String.fromCharCode(0x2660); break;
case 'clubs'ch = String.fromCharCode(0x2663); break;
case 'hearts'ch = String.fromCharCode(0x2665); break;
case 'diams'ch = String.fromCharCode(0x2666); break;
default: ch = ""; break;
}
}
i = semicolonIndex;
}
}
out += ch;
}
return out;
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment