【探索】用js打语言包（使用jquery.i18n.properties）
2015-08-18 16:44
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网站为了国际化的需要，会使用到语言包。
博主之前用到过的语言包都是依靠后端语言或者模板语言进行的语言包，当然js部分中使用的文案会用到js自己的语言包，不过会通过后端语言动态加载中文or英文的js语言包。
这次尝试用js来打语言包，用到了插件 jquery.i18n.properties ，很明显，使用这个插件需要先加载jquery。
那就来看一下具体代码吧：
jquery.i18n.properties-1.0.9.js
中文语言包 strings_zh.properties
英文语言包 strings_en.properties
代码布局结构
和后端/模板语言来打语言包，进行语言切换相比：
优点：
1、针对普通的html就可以使用（不需要改成php等）
缺点：
1、需要同时加载中文和英文两套图片，哪怕当前不显示（如果中文和英文的图片不一样的话），耗费了更多的流量
2、针对中文和英文的不同样式也都要写在同一个文件中，不像用后端语言时，中文和英文的样式分成两个文件，需要调用时加载对应的
博主之前用到过的语言包都是依靠后端语言或者模板语言进行的语言包，当然js部分中使用的文案会用到js自己的语言包，不过会通过后端语言动态加载中文or英文的js语言包。
这次尝试用js来打语言包，用到了插件 jquery.i18n.properties ，很明显，使用这个插件需要先加载jquery。
那就来看一下具体代码吧：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html" charset="utf-8" />
<title>js 语言包测试</title>
<style>
.zh .zh_png{
display:block;
}
.zh .en_png{
display:none;
}
.en .zh_png{
display:none;
}
.en .en_png{
display:block;
}
.img_bg{
background-position:0 0;
width:30px;
height:30px;
}
.zh .img_bg{
background-image:url('img/img_bg_zh.png');
}
.en .img_bg{
background-image:url('img/img_bg_en.png');
}
</style>
</head>
<body class="zh">
<div class="wrap">
<h1 data-lang="string_lang1">标题</h1>
<p data-lang="string_lang2">段落内容，balabala</p>
<ul class="nav">
<li><a data-lang="string_lang3">导航1</a></li>
<li><a data-lang="string_lang4">导航2</a></li>
<li><a data-lang="string_lang5">导航3</a></li>
<li><a data-lang="string_lang6">导航4</a></li>
</ul>
<img class="zh_png" src="img/img1_zh.png" />
<img class="en_png" src="img/img1_en.png" />
<div class="screen1">
<div class="inner">
<h1 data-lang="string_lang7">第一屏</h1>
<p data-lang="string_lang8">第一屏内容</p>
</div>
</div>
<div class="img_bg"></div>
</div>
<a id="J_lang_switch" data-lang="string_lang9">切换到英文</a>
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
<script src="js/jquery.i18n.properties-1.0.9.js"></script>
<script>
var language_pack = {
now_lang : 0, // 0:ch,1:en
loadProperties : function(new_lang){
var self = this;
var tmp_lang = '';
if(new_lang == 0){
tmp_lang = 'zh';
$('body').removeClass('en').addClass('zh');
}else{
tmp_lang = 'en';
$('body').removeClass('zh').addClass('en');
}
jQuery.i18n.properties({//加载资浏览器语言对应的资源文件
name: 'strings', //资源文件名称
path:'language/', //资源文件路径
language: tmp_lang,
cache: false,
mode:'map', //用Map的方式使用资源文件中的值
callback: function() {//加载成功后设置显示内容
for(var i in $.i18n.map){
$('[data-lang="'+i+'"]').text($.i18n.map[i]);
}
document.title = $.i18n.map['string_title'];
}
});
self.now_lang = new_lang;
}
}
$(document).ready(function(){
language_pack.loadProperties(0);
$('#J_lang_switch').click(function(){
var new_lang;
if(language_pack.now_lang == 0){
new_lang = 1;
}else{
new_lang = 0;
}
language_pack.loadProperties(new_lang);
});
});
</script>
</body>
</html>jquery.i18n.properties-1.0.9.js
/******************************************************************************
* jquery.i18n.properties
*
* Dual licensed under the GPL (http://dev.jquery.com/browser/trunk/jquery/GPL-LICENSE.txt) and
* MIT (http://dev.jquery.com/browser/trunk/jquery/MIT-LICENSE.txt) licenses.
*
* @version 1.0.x
* @author Nuno Fernandes
* @url www.codingwithcoffee.com
* @inspiration Localisation assistance for jQuery (http://keith-wood.name/localisation.html)
* by Keith Wood (kbwood{at}iinet.com.au) June 2007
*
*****************************************************************************/
(function($) {
$.i18n = {};
/** Map holding bundle keys (if mode: 'map') */
$.i18n.map = {};
/**
* Load and parse message bundle files (.properties),
* making bundles keys available as javascript variables.
*
* i18n files are named <name>.js, or <name>_<language>.js or <name>_<language>_<country>.js
* Where:
* The <language> argument is a valid ISO Language Code. These codes are the lower-case,
* two-letter codes as defined by ISO-639. You can find a full list of these codes at a
* number of sites, such as: http://www.loc.gov/standards/iso639-2/englangn.html * The <country> argument is a valid ISO Country Code. These codes are the upper-case,
* two-letter codes as defined by ISO-3166. You can find a full list of these codes at a
* number of sites, such as: http://www.iso.ch/iso/en/prods-services/iso3166ma/02iso-3166-code-lists/list-en1.html *
* Sample usage for a bundles/Messages.properties bundle:
* $.i18n.properties({
* name: 'Messages',
* language: 'en_US',
* path: 'bundles'
* });
* @param name (string/string[], optional) names of file to load (eg, 'Messages' or ['Msg1','Msg2']). Defaults to "Messages"
* @param language (string, optional) language/country code (eg, 'en', 'en_US', 'pt_PT'). if not specified, language reported by the browser will be used instead.
* @param path (string, optional) path of directory that contains file to load
* @param mode (string, optional) whether bundles keys are available as JavaScript variables/functions or as a map (eg, 'vars' or 'map')
* @param cache (boolean, optional) whether bundles should be cached by the browser, or forcibly reloaded on each page load. Defaults to false (i.e. forcibly reloaded)
* @param encoding (string, optional) the encoding to request for bundles. Property file resource bundles are specified to be in ISO-8859-1 format. Defaults to UTF-8 for backward compatibility.
* @param callback (function, optional) callback function to be called after script is terminated
*/
$.i18n.properties = function(settings) {
// set up settings
var defaults = {
name: 'Messages',
language: '',
path: '',
mode: 'vars',
cache: false,
encoding: 'UTF-8',
callback: null
};
settings = $.extend(defaults, settings);
if(settings.language === null || settings.language == '') {
settings.language = $.i18n.browserLang();
}
if(settings.language === null) {settings.language='';}
// load and parse bundle files
var files = getFiles(settings.name);
for(i=0; i<files.length; i++) {
// 1. load base (eg, Messages.properties)
// 此行为博主注释
// loadAndParseFile(settings.path + files[i] + '.properties', settings);
// 2. with language code (eg, Messages_pt.properties)
if(settings.language.length >= 2) {
loadAndParseFile(settings.path + files[i] + '_' + settings.language.substring(0, 2) +'.properties', settings);
}
// 3. with language code and country code (eg, Messages_pt_PT.properties)
if(settings.language.length >= 5) {
loadAndParseFile(settings.path + files[i] + '_' + settings.language.substring(0, 5) +'.properties', settings);
}
}
// call callback
if(settings.callback){ settings.callback(); }
};
/**
* When configured with mode: 'map', allows access to bundle values by specifying its key.
* Eg, jQuery.i18n.prop('com.company.bundles.menu_add')
*/
$.i18n.prop = function(key /* Add parameters as function arguments as necessary */) {
var value = $.i18n.map[key];
if (value == null)
return '[' + key + ']';
// if(arguments.length < 2) // No arguments.
// //if(key == 'spv.lbl.modified') {alert(value);}
// return value;
// if (!$.isArray(placeHolderValues)) {
// // If placeHolderValues is not an array, make it into one.
// placeHolderValues = [placeHolderValues];
// for (var i=2; i<arguments.length; i++)
// placeHolderValues.push(arguments[i]);
// }
// Place holder replacement
/**
* Tested with:
* test.t1=asdf ''{0}''
* test.t2=asdf '{0}' '{1}'{1}'zxcv
* test.t3=This is \"a quote" 'a''{0}''s'd{fgh{ij'
* test.t4="'''{'0}''" {0}{a}
* test.t5="'''{0}'''" {1}
* test.t6=a {1} b {0} c
* test.t7=a 'quoted \\ s\ttringy' \t\t x
*
* Produces:
* test.t1, p1 ==> asdf 'p1'
* test.t2, p1 ==> asdf {0} {1}{1}zxcv
* test.t3, p1 ==> This is "a quote" a'{0}'sd{fgh{ij
* test.t4, p1 ==> "'{0}'" p1{a}
* test.t5, p1 ==> "'{0}'" {1}
* test.t6, p1 ==> a {1} b p1 c
* test.t6, p1, p2 ==> a p2 b p1 c
* test.t6, p1, p2, p3 ==> a p2 b p1 c
* test.t7 ==> a quoted \ s tringy x
*/
var i;
if (typeof(value) == 'string') {
// Handle escape characters. Done separately from the tokenizing loop below because escape characters are
// active in quoted strings.
i = 0;
while ((i = value.indexOf('\\', i)) != -1) {
if (value[i+1] == 't')
value = value.substring(0, i) + '\t' + value.substring((i++) + 2); // tab
else if (value[i+1] == 'r')
value = value.substring(0, i) + '\r' + value.substring((i++) + 2); // return
else if (value[i+1] == 'n')
value = value.substring(0, i) + '\n' + value.substring((i++) + 2); // line feed
else if (value[i+1] == 'f')
value = value.substring(0, i) + '\f' + value.substring((i++) + 2); // form feed
else if (value[i+1] == '\\')
value = value.substring(0, i) + '\\' + value.substring((i++) + 2); // \
else
value = value.substring(0, i) + value.substring(i+1); // Quietly drop the character
}
// Lazily convert the string to a list of tokens.
var arr = [], j, index;
i = 0;
while (i < value.length) {
if (value[i] == '\'') {
// Handle quotes
if (i == value.length-1)
value = value.substring(0, i); // Silently drop the trailing quote
else if (value[i+1] == '\'')
value = value.substring(0, i) + value.substring(++i); // Escaped quote
else {
// Quoted string
j = i + 2;
while ((j = value.indexOf('\'', j)) != -1) {
if (j == value.length-1 || value[j+1] != '\'') {
// Found start and end quotes. Remove them
value = value.substring(0,i) + value.substring(i+1, j) + value.substring(j+1);
i = j - 1;
break;
}
else {
// Found a double quote, reduce to a single quote.
value = value.substring(0,j) + value.substring(++j);
}
}
if (j == -1) {
// There is no end quote. Drop the start quote
value = value.substring(0,i) + value.substring(i+1);
}
}
}
else if (value[i] == '{') {
// Beginning of an unquoted place holder.
j = value.indexOf('}', i+1);
if (j == -1)
i++; // No end. Process the rest of the line. Java would throw an exception
else {
// Add 1 to the index so that it aligns with the function arguments.
index = parseInt(value.substring(i+1, j));
if (!isNaN(index) && index >= 0) {
// Put the line thus far (if it isn't empty) into the array
var s = value.substring(0, i);
if (s != "")
arr.push(s);
// Put the parameter reference into the array
arr.push(index);
// Start the processing over again starting from the rest of the line.
i = 0;
value = value.substring(j+1);
}
else
i = j + 1; // Invalid parameter. Leave as is.
}
}
else
i++;
}
// Put the remainder of the no-empty line into the array.
if (value != "")
arr.push(value);
value = arr;
// Make the array the value for the entry.
$.i18n.map[key] = arr;
}
if (value.length == 0)
return "";
if (value.lengh == 1 && typeof(value[0]) == "string")
return value[0];
var s = "";
for (i=0; i<value.length; i++) {
if (typeof(value[i]) == "string")
s += value[i];
// Must be a number
else if (value[i] + 1 < arguments.length)
s += arguments[value[i] + 1];
else
s += "{"+ value[i] +"}";
}
return s;
};
/** Language reported by browser, normalized code */
$.i18n.browserLang = function() {
return normaliseLanguageCode(navigator.language /* Mozilla */ || navigator.userLanguage /* IE */);
}
/** Load and parse .properties files */
function loadAndParseFile(filename, settings) {
$.ajax({
url: filename,
async: false,
cache: settings.cache,
contentType:'text/plain;charset='+ settings.encoding,
dataType: 'text',
success: function(data, status) {
parseData(data, settings.mode);
}
});
}
/** Parse .properties files */
function parseData(data, mode) {
var parsed = '';
var parameters = data.split( /\n/ );
var regPlaceHolder = /(\{\d+\})/g;
var regRepPlaceHolder = /\{(\d+)\}/g;
var unicodeRE = /(\\u.{4})/ig;
for(var i=0; i<parameters.length; i++ ) {
parameters[i] = parameters[i].replace( /^\s\s*/, '' ).replace( /\s\s*$/, '' ); // trim
if(parameters[i].length > 0 && parameters[i].match("^#")!="#") { // skip comments
var pair = parameters[i].split('=');
if(pair.length > 0) {
/** Process key & value */
var name = unescape(pair[0]).replace( /^\s\s*/, '' ).replace( /\s\s*$/, '' ); // trim
var value = pair.length == 1 ? "" : pair[1];
// process multi-line values
while(value.match(/\\$/)=="\\") {
value = value.substring(0, value.length - 1);
value += parameters[++i].replace( /\s\s*$/, '' ); // right trim
}
// Put values with embedded '='s back together
for(var s=2;s<pair.length;s++){ value +='=' + pair[s]; }
value = value.replace( /^\s\s*/, '' ).replace( /\s\s*$/, '' ); // trim
/** Mode: bundle keys in a map */
if(mode == 'map' || mode == 'both') {
// handle unicode chars possibly left out
var unicodeMatches = value.match(unicodeRE);
if(unicodeMatches) {
for(var u=0; u<unicodeMatches.length; u++) {
value = value.replace( unicodeMatches[u], unescapeUnicode(unicodeMatches[u]));
}
}
// add to map
$.i18n.map[name] = value;
}
/** Mode: bundle keys as vars/functions */
if(mode == 'vars' || mode == 'both') {
value = value.replace( /"/g, '\\"' ); // escape quotation mark (")
// make sure namespaced key exists (eg, 'some.key')
checkKeyNamespace(name);
// value with variable substitutions
if(regPlaceHolder.test(value)) {
var parts = value.split(regPlaceHolder);
// process function args
var first = true;
var fnArgs = '';
var usedArgs = [];
for(var p=0; p<parts.length; p++) {
if(regPlaceHolder.test(parts[p]) && (usedArgs.length == 0 || usedArgs.indexOf(parts[p]) == -1)) {
if(!first) {fnArgs += ',';}
fnArgs += parts[p].replace(regRepPlaceHolder, 'v$1');
usedArgs.push(parts[p]);
first = false;
}
}
parsed += name + '=function(' + fnArgs + '){';
// process function body
var fnExpr = '"' + value.replace(regRepPlaceHolder, '"+v$1+"') + '"';
parsed += 'return ' + fnExpr + ';' + '};';
// simple value
}else{
parsed += name+'="'+value+'";';
}
} // END: Mode: bundle keys as vars/functions
} // END: if(pair.length > 0)
} // END: skip comments
}
eval(parsed);
}
/** Make sure namespace exists (for keys with dots in name) */
// TODO key parts that start with numbers quietly fail. i.e. month.short.1=Jan
function checkKeyNamespace(key) {
var regDot = /\./;
if(regDot.test(key)) {
var fullname = '';
var names = key.split( /\./ );
for(var i=0; i<names.length; i++) {
if(i>0) {fullname += '.';}
fullname += names[i];
if(eval('typeof '+fullname+' == "undefined"')) {
eval(fullname + '={};');
}
}
}
}
/** Make sure filename is an array */
function getFiles(names) {
return (names && names.constructor == Array) ? names : [names];
}
/** Ensure language code is in the format aa_AA. */
function normaliseLanguageCode(lang) {
lang = lang.toLowerCase();
if(lang.length > 3) {
lang = lang.substring(0, 3) + lang.substring(3).toUpperCase();
}
return lang;
}
/** Unescape unicode chars ('\u00e3') */
function unescapeUnicode(str) {
// unescape unicode codes
var codes = [];
var code = parseInt(str.substr(2), 16);
if (code >= 0 && code < Math.pow(2, 16)) {
codes.push(code);
}
// convert codes to text
var unescaped = '';
for (var i = 0; i < codes.length; ++i) {
unescaped += String.fromCharCode(codes[i]);
}
return unescaped;
}
/* Cross-Browser Split 1.0.1
(c) Steven Levithan <stevenlevithan.com>; MIT License
An ECMA-compliant, uniform cross-browser split method */
var cbSplit;
// avoid running twice, which would break `cbSplit._nativeSplit`'s reference to the native `split`
if (!cbSplit) {
cbSplit = function(str, separator, limit) {
// if `separator` is not a regex, use the native `split`
if (Object.prototype.toString.call(separator) !== "[object RegExp]") {
if(typeof cbSplit._nativeSplit == "undefined")
return str.split(separator, limit);
else
return cbSplit._nativeSplit.call(str, separator, limit);
}
var output = [],
lastLastIndex = 0,
flags = (separator.ignoreCase ? "i" : "") +
(separator.multiline ? "m" : "") +
(separator.sticky ? "y" : ""),
separator = RegExp(separator.source, flags + "g"), // make `global` and avoid `lastIndex` issues by working with a copy
separator2, match, lastIndex, lastLength;
str = str + ""; // type conversion
if (!cbSplit._compliantExecNpcg) {
separator2 = RegExp("^" + separator.source + "$(?!\\s)", flags); // doesn't need /g or /y, but they don't hurt
}
/* behavior for `limit`: if it's...
- `undefined`: no limit.
- `NaN` or zero: return an empty array.
- a positive number: use `Math.floor(limit)`.
- a negative number: no limit.
- other: type-convert, then use the above rules. */
if (limit === undefined || +limit < 0) {
limit = Infinity;
} else {
limit = Math.floor(+limit);
if (!limit) {
return [];
}
}
while (match = separator.exec(str)) {
lastIndex = match.index + match[0].length; // `separator.lastIndex` is not reliable cross-browser
if (lastIndex > lastLastIndex) {
output.push(str.slice(lastLastIndex, match.index));
// fix browsers whose `exec` methods don't consistently return `undefined` for nonparticipating capturing groups
if (!cbSplit._compliantExecNpcg && match.length > 1) {
match[0].replace(separator2, function () {
for (var i = 1; i < arguments.length - 2; i++) {
if (arguments[i] === undefined) {
match[i] = undefined;
}
}
});
}
if (match.length > 1 && match.index < str.length) {
Array.prototype.push.apply(output, match.slice(1));
}
lastLength = match[0].length;
lastLastIndex = lastIndex;
if (output.length >= limit) {
break;
}
}
if (separator.lastIndex === match.index) {
separator.lastIndex++; // avoid an infinite loop
}
}
if (lastLastIndex === str.length) {
if (lastLength || !separator.test("")) {
output.push("");
}
} else {
output.push(str.slice(lastLastIndex));
}
return output.length > limit ? output.slice(0, limit) : output;
};
cbSplit._compliantExecNpcg = /()??/.exec("")[1] === undefined; // NPCG: nonparticipating capturing group
cbSplit._nativeSplit = String.prototype.split;
} // end `if (!cbSplit)`
String.prototype.split = function (separator, limit) {
return cbSplit(this, separator, limit);
};
})(jQuery);中文语言包 strings_zh.properties
string_title=js 语言包测试 string_lang1=标题 string_lang2=段落内容，balabala string_lang3=导航1 string_lang4=导航2 string_lang5=导航3 string_lang6=导航4 string_lang7=第一屏 string_lang8=第一屏内容 string_lang9=切换到英文
英文语言包 strings_en.properties
string_title=js language test string_lang1=title string_lang2=content，balabala string_lang3=nav1 string_lang4=nav2 string_lang5=nav3 string_lang6=nav4 string_lang7=screen1 string_lang8=screen content string_lang9=change to Chinese
代码布局结构
和后端/模板语言来打语言包，进行语言切换相比：
优点：
1、针对普通的html就可以使用（不需要改成php等）
缺点：
1、需要同时加载中文和英文两套图片，哪怕当前不显示（如果中文和英文的图片不一样的话），耗费了更多的流量
2、针对中文和英文的不同样式也都要写在同一个文件中，不像用后端语言时，中文和英文的样式分成两个文件，需要调用时加载对应的
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 
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