How to convert string between HTML entities and Ascii with JavaScript Back

In order to convert a string text between HTML entities and Ascii,you need a table for transforming:

var entityTable = {
    34: 'quot',
    38: 'amp',
    39: 'apos',
    60: 'lt',
    62: 'gt',
    160: 'nbsp',
    161: 'iexcl',
    162: 'cent',
    163: 'pound',
    164: 'curren',
    165: 'yen',
    166: 'brvbar',
    167: 'sect',
    168: 'uml',
    169: 'copy',
    170: 'ordf',
    171: 'laquo',
    172: 'not',
    173: 'shy',
    174: 'reg',
    175: 'macr',
    176: 'deg',
    177: 'plusmn',
    178: 'sup2',
    179: 'sup3',
    180: 'acute',
    181: 'micro',
    182: 'para',
    183: 'middot',
    184: 'cedil',
    185: 'sup1',
    186: 'ordm',
    187: 'raquo',
    188: 'frac14',
    189: 'frac12',
    190: 'frac34',
    191: 'iquest',
    192: 'Agrave',
    193: 'Aacute',
    194: 'Acirc',
    195: 'Atilde',
    196: 'Auml',
    197: 'Aring',
    198: 'AElig',
    199: 'Ccedil',
    200: 'Egrave',
    201: 'Eacute',
    202: 'Ecirc',
    203: 'Euml',
    204: 'Igrave',
    205: 'Iacute',
    206: 'Icirc',
    207: 'Iuml',
    208: 'ETH',
    209: 'Ntilde',
    210: 'Ograve',
    211: 'Oacute',
    212: 'Ocirc',
    213: 'Otilde',
    214: 'Ouml',
    215: 'times',
    216: 'Oslash',
    217: 'Ugrave',
    218: 'Uacute',
    219: 'Ucirc',
    220: 'Uuml',
    221: 'Yacute',
    222: 'THORN',
    223: 'szlig',
    224: 'agrave',
    225: 'aacute',
    226: 'acirc',
    227: 'atilde',
    228: 'auml',
    229: 'aring',
    230: 'aelig',
    231: 'ccedil',
    232: 'egrave',
    233: 'eacute',
    234: 'ecirc',
    235: 'euml',
    236: 'igrave',
    237: 'iacute',
    238: 'icirc',
    239: 'iuml',
    240: 'eth',
    241: 'ntilde',
    242: 'ograve',
    243: 'oacute',
    244: 'ocirc',
    245: 'otilde',
    246: 'ouml',
    247: 'divide',
    248: 'oslash',
    249: 'ugrave',
    250: 'uacute',
    251: 'ucirc',
    252: 'uuml',
    253: 'yacute',
    254: 'thorn',
    255: 'yuml',
    402: 'fnof',
    913: 'Alpha',
    914: 'Beta',
    915: 'Gamma',
    916: 'Delta',
    917: 'Epsilon',
    918: 'Zeta',
    919: 'Eta',
    920: 'Theta',
    921: 'Iota',
    922: 'Kappa',
    923: 'Lambda',
    924: 'Mu',
    925: 'Nu',
    926: 'Xi',
    927: 'Omicron',
    928: 'Pi',
    929: 'Rho',
    931: 'Sigma',
    932: 'Tau',
    933: 'Upsilon',
    934: 'Phi',
    935: 'Chi',
    936: 'Psi',
    937: 'Omega',
    945: 'alpha',
    946: 'beta',
    947: 'gamma',
    948: 'delta',
    949: 'epsilon',
    950: 'zeta',
    951: 'eta',
    952: 'theta',
    953: 'iota',
    954: 'kappa',
    955: 'lambda',
    956: 'mu',
    957: 'nu',
    958: 'xi',
    959: 'omicron',
    960: 'pi',
    961: 'rho',
    962: 'sigmaf',
    963: 'sigma',
    964: 'tau',
    965: 'upsilon',
    966: 'phi',
    967: 'chi',
    968: 'psi',
    969: 'omega',
    977: 'thetasym',
    978: 'upsih',
    982: 'piv',
    8226: 'bull',
    8230: 'hellip',
    8242: 'prime',
    8243: 'Prime',
    8254: 'oline',
    8260: 'frasl',
    8472: 'weierp',
    8465: 'image',
    8476: 'real',
    8482: 'trade',
    8501: 'alefsym',
    8592: 'larr',
    8593: 'uarr',
    8594: 'rarr',
    8595: 'darr',
    8596: 'harr',
    8629: 'crarr',
    8656: 'lArr',
    8657: 'uArr',
    8658: 'rArr',
    8659: 'dArr',
    8660: 'hArr',
    8704: 'forall',
    8706: 'part',
    8707: 'exist',
    8709: 'empty',
    8711: 'nabla',
    8712: 'isin',
    8713: 'notin',
    8715: 'ni',
    8719: 'prod',
    8721: 'sum',
    8722: 'minus',
    8727: 'lowast',
    8730: 'radic',
    8733: 'prop',
    8734: 'infin',
    8736: 'ang',
    8743: 'and',
    8744: 'or',
    8745: 'cap',
    8746: 'cup',
    8747: 'int',
    8756: 'there4',
    8764: 'sim',
    8773: 'cong',
    8776: 'asymp',
    8800: 'ne',
    8801: 'equiv',
    8804: 'le',
    8805: 'ge',
    8834: 'sub',
    8835: 'sup',
    8836: 'nsub',
    8838: 'sube',
    8839: 'supe',
    8853: 'oplus',
    8855: 'otimes',
    8869: 'perp',
    8901: 'sdot',
    8968: 'lceil',
    8969: 'rceil',
    8970: 'lfloor',
    8971: 'rfloor',
    9001: 'lang',
    9002: 'rang',
    9674: 'loz',
    9824: 'spades',
    9827: 'clubs',
    9829: 'hearts',
    9830: 'diams',
    338: 'OElig',
    339: 'oelig',
    352: 'Scaron',
    353: 'scaron',
    376: 'Yuml',
    710: 'circ',
    732: 'tilde',
    8194: 'ensp',
    8195: 'emsp',
    8201: 'thinsp',
    8204: 'zwnj',
    8205: 'zwj',
    8206: 'lrm',
    8207: 'rlm',
    8211: 'ndash',
    8212: 'mdash',
    8216: 'lsquo',
    8217: 'rsquo',
    8218: 'sbquo',
    8220: 'ldquo',
    8221: 'rdquo',
    8222: 'bdquo',
    8224: 'dagger',
    8225: 'Dagger',
    8240: 'permil',
    8249: 'lsaquo',
    8250: 'rsaquo',
    8364: 'euro'
};

Ascii to HTML entities

function A2E(str) {
    return str.replace(/[\u00A0-\u2666<>\&]/g, function(c) {
        return '&' + (entityTable[c.charCodeAt(0)] || '#' + c.charCodeAt(0)) + ';';
    });
}

HTML entities to Ascii

function E2A(str) {
    function getKey(value) {
        value = value.replace('&', '');
        value = value.replace(';', '');

        /** get the first key of a specific value */
        for (var prop in entityTable) {
            if (entityTable.hasOwnProperty(prop)) {
                if (entityTable.prop === value || entityTable[prop] === value) {
                    return String.fromCharCode(prop);
                }
            }
        }

        return null;
    };

    return str.replace(/&([\S]+?);/g, getKey);
}

Reference

• http://stackoverflow.com/a/1354715

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