Merge pull request #844 from thx2001r/patch-1

Added option to evaluate length in UTF-8 bytes

src/js/validator/stringLength.js

@@ -10,7 +10,8 @@
         html5Attributes: {
             message: 'message',
             min: 'min',
-            max: 'max'
+            max: 'max',
+            utf8bytes: 'utf8Bytes'
         },
 
         enableByHtml5: function($field) {
@@ -35,6 +36,7 @@
          * @param {Object} options Consists of following keys:
          * - min
          * - max
+         * - utf8Bytes
          * At least one of two keys is required
          * The min, max keys define the number which the field value compares to. min, max can be
          *      - A number
@@ -43,7 +45,10 @@
          *      - A callback function that returns the number
          *
          * - message: The invalid message
+         * - utf8bytes: Evaluate string length in UTF-8 bytes, default to false (no changes to existing scripts)
          * @returns {Object}
+         * 
+         * Credit to http://stackoverflow.com/a/23329386 (http://github.com/lovasoa) for UTF-8 byte length code
          */
         validate: function(validator, $field, options) {
             var value = $field.val();
@@ -51,11 +56,21 @@
                 return true;
             }
 
-            var min     = $.isNumeric(options.min) ? options.min : validator.getDynamicOption($field, options.min),
-                max     = $.isNumeric(options.max) ? options.max : validator.getDynamicOption($field, options.max),
-                length  = value.length,
-                isValid = true,
-                message = options.message || $.fn.bootstrapValidator.i18n.stringLength['default'];
+            var min        = $.isNumeric(options.min) ? options.min : validator.getDynamicOption($field, options.min),
+                max        = $.isNumeric(options.max) ? options.max : validator.getDynamicOption($field, options.max),
+                utf8length = function(str) {
+                                 var s = str.length;
+                                 for (var i=str.length-1; i>=0; i--) {
+                                     var code = str.charCodeAt(i);
+                                     if (code > 0x7f && code <= 0x7ff) s++;
+                                     else if (code > 0x7ff && code <= 0xffff) s+=2;
+                                     if (code >= 0xDC00 && code <= 0xDFFF) i--;
+                                 }
+                                 return s;
+                             }(value),
+                length     = (options.utf8Bytes ? utf8length : value.length),
+                isValid    = true,
+                message    = options.message || $.fn.bootstrapValidator.i18n.stringLength['default'];
 
             if ((min && length < parseInt(min, 10)) || (max && length > parseInt(max, 10))) {
                 isValid = false;