ui/webui/resources/js/i18n_template.js

   1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * NOTE: The use of this file is deprecated. Use i18n_template2.js instead.
   7  *
   8  * @fileoverview This is a simple template engine inspired by JsTemplates
   9  * optimized for i18n.
  10  *
  11  * It currently supports two handlers:
  12  *
  13  *   * i18n-content which sets the textContent of the element
  14  *
  15  *     <span i18n-content="myContent"></span>
  16  *     i18nTemplate.process(element, {'myContent': 'Content'});
  17  *
  18  *   * i18n-values is a list of attribute-value or property-value pairs.
  19  *     Properties are prefixed with a '.' and can contain nested properties.
  20  *
  21  *     <span i18n-values="title:myTitle;.style.fontSize:fontSize"></span>
  22  *     i18nTemplate.process(element, {
  23  *       'myTitle': 'Title',
  24  *       'fontSize': '13px'
  25  *     });
  26  */
  27
  28 var i18nTemplate = (function() {
  29   /**
  30    * This provides the handlers for the templating engine. The key is used as
  31    * the attribute name and the value is the function that gets called for every
  32    * single node that has this attribute.
  33    * @type {Object}
  34    */
  35   var handlers = {
  36     /**
  37      * This handler sets the textContent of the element.
  38      */
  39     'i18n-content': function(element, attributeValue, obj) {
  40       element.textContent = obj[attributeValue];
  41     },
  42
  43     /**
  44      * This handler adds options to a select element.
  45      */
  46     'i18n-options': function(element, attributeValue, obj) {
  47       var options = obj[attributeValue];
  48       options.forEach(function(values) {
  49         var option = typeof values == 'string' ? new Option(values) :
  50             new Option(values[1], values[0]);
  51         element.appendChild(option);
  52       });
  53     },
  54
  55     /**
  56      * This is used to set HTML attributes and DOM properties,. The syntax is:
  57      *   attributename:key;
  58      *   .domProperty:key;
  59      *   .nested.dom.property:key
  60      */
  61     'i18n-values': function(element, attributeValue, obj) {
  62       var parts = attributeValue.replace(/\s/g, '').split(/;/);
  63       for (var j = 0; j < parts.length; j++) {
  64         var a = parts[j].match(/^([^:]+):(.+)$/);
  65         if (a) {
  66           var propName = a[1];
  67           var propExpr = a[2];
  68
  69           // Ignore missing properties
  70           if (propExpr in obj) {
  71             var value = obj[propExpr];
  72             if (propName.charAt(0) == '.') {
  73               var path = propName.slice(1).split('.');
  74               var object = element;
  75               while (object && path.length > 1) {
  76                 object = object[path.shift()];
  77               }
  78               if (object) {
  79                 object[path] = value;
  80                 // In case we set innerHTML (ignoring others) we need to
  81                 // recursively check the content
  82                 if (path == 'innerHTML') {
  83                   process(element, obj);
  84                 }
  85               }
  86             } else {
  87               element.setAttribute(propName, value);
  88             }
  89           } else {
  90             console.warn('i18n-values: Missing value for "' + propExpr + '"');
  91           }
  92         }
  93       }
  94     }
  95   };
  96
  97   var attributeNames = [];
  98   for (var key in handlers) {
  99     attributeNames.push(key);
 100   }
 101   var selector = '[' + attributeNames.join('],[') + ']';
 102
 103   /**
 104    * Processes a DOM tree with the {@code obj} map.
 105    */
 106   function process(node, obj) {
 107     var elements = node.querySelectorAll(selector);
 108     for (var element, i = 0; element = elements[i]; i++) {
 109       for (var j = 0; j < attributeNames.length; j++) {
 110         var name = attributeNames[j];
 111         var att = element.getAttribute(name);
 112         if (att != null) {
 113           handlers[name](element, att, obj);
 114         }
 115       }
 116     }
 117   }
 118
 119   return {
 120     process: process
 121   };
 122 })();