JavaScript中的区域设置感知号码转换

Question

是否有可用于促进NUMBER LOCALIZATION的JQuery插件？也就是说,插件应该将数字转换为其本地字形.

Arabic               |     ????      |   1234

Indic (Telugu/Hindi) |  ?????/?????   |  12345

PS:我的要求是数字转换,而不是格式化.

Answer 1

你可以使用一个简单的功能,像这样的的翻译从阿拉伯数字:

function translateNumerals(input, target) {
    var systems = {
            devanagari: 2406, tamil: 3046, kannada:  3302, 
            telugu: 3174, marathi: 2406, malayalam: 3430, 
            oriya: 2918, gurmukhi: 2662, nagari: 2534, gujarati: 2790
        },
        zero = 48, // char code for Arabic zero
        nine = 57, // char code for Arabic nine
        offset = (systems[target.toLowerCase()] || zero) - zero,
        output = input.toString().split(""),
        i, l = output.length, cc;

    for (i = 0; i < l; i++) {
        cc = output[i].charCodeAt(0);
        if (cc >= zero && cc <= nine) {
            output[i] = String.fromCharCode(cc + offset);
        }
    }
    return output.join("");
}

并称之为这样

translateNumerals(12345, "Telugu")      // "?????"
translateNumerals(12345, "Devanagari")  // "?????"
translateNumerals("foo", "Devanagari")  // "foo"

翻译成阿拉伯数字同样简单.它需要更多的管道.

上面的函数知道任何目标系统中零的charCode,并做一些简单的数学运算,从阿拉伯数字到该系统进行逐字符转换.

反向函数需要检查输入的每个字符.如果它落在任何源系统的charCode 范围(即相应的零+9的charCode),它知道所需的偏移量.减去偏移量将使您进入阿拉伯语范围.这非常简单,我会留给你.

编辑#1:既然你提到了jQuery,上面的内容可以像这样插入:

jQuery.fn.extend({
    textTranslateNumerals: (function () {
        var translateNumerals = function (input, target) {
            // the above function
        };
        return function (target) {
            // for each selected element...
            return this.each(function () {
                // ...look at each child node and
                $(this).contents().each(function () {
                    // ...translate text nodes, recurse into elements
                    if (this.nodeType === this.TEXT_NODE) {
                        $(this).text(translateNumerals($(this).text(), target));
                    } else if (this.nodeType === this.ELEMENT_NODE) {
                        $(this).textTranslateNumerals(target);
                    }
                });
            });
        };
    })()
});

编辑#2: FWIW,这里是可以从转换函数的任何源系统到任何目标系统:

function translateNumerals(input, source, target) {
  var systems = {
    arabic:       48,
    devanagari: 2406, tamil: 3046, kannada:  3302, telugu: 3174, marathi:  2406,
    malayalam:  3430, oriya: 2918, gurmukhi: 2662, nagari: 2534, gujarati: 2790,
  },
  output = [], offset = 0, zero = 0, nine = 0, char = 0;

  source = source.toLowerCase();
  target = target.toLowerCase();

  if ( !(source in systems && target in systems) 
       || input == null 
       || typeof input == "undefined" || typeof input == "object" ) {
    return input;
  }

  input  = input.toString();
  offset = systems[target] - systems[source];
  zero   = systems[source];
  nine   = systems[source] + 9;

  for (var i=0, l=input.length; i<l; i++) {
    var char = input.charCodeAt(i);

    if (char >= zero && char <= nine) {
      output.push( String.fromCharCode(char + offset) );
    } else {
      output.push( input[i] );
    }
  }
  return output.join("");
}

样本输出

translateNumerals("0123456789", "arabic", "malayalam")  // "??????????"
translateNumerals("??????????", "malayalam", "arabic")  // "0123456789"
translateNumerals("??????????", "malayalam", "kannada") // "??????????"
translateNumerals("??????????", "kannada", "nagari") // "??????????"
translateNumerals("??????????", "kannada", "gujarati") // "??????????"
translateNumerals("USD 13.56", "arabic", "nagari") // "USD ??.??"