Adding validations for minimum and maximum dates

Changing the date validation function, adding optional attributes min-date and max-date. If informed, it sets an allowed range for the date. It checks following this order: valid date, minimum date, maximum date. Both data-validation-min-date and max-date should be informed using the same format as the field (yyyy-mm-dd as default or any format informed through data-validation-format). English and portuguese locales are ok. The other ones are untranslated.

Author: etcho

form-validator/jquery.form-validator.js

@@ -1958,6 +1958,8 @@
       badTelephone: 'You have not given a correct phone number',
       badSecurityAnswer: 'You have not given a correct answer to the security question',
       badDate: 'You have not given a correct date',
+      badDateBefore: 'The minimum allowed date is ',
+      badDateAfter: 'The maximum allowed date is ',
       lengthBadStart: 'The input value must be between ',
       lengthBadEnd: ' characters',
       lengthTooLongStart: 'The input value is longer than ',
@@ -2286,19 +2288,48 @@
 
   /*
    * Validate date
+   * element attrs (optional, and both must use the same format as the field)
+   *    data-validation-min-date
+   *    data-validation-max-date
    */
   $.formUtils.addValidator({
     name: 'date',
-    validatorFunction: function (date, $el, conf) {
+    validatorFunction: function (date, $el, conf, lang) {
       var dateFormat = $el.valAttr('format') || conf.dateFormat || 'yyyy-mm-dd',
         addMissingLeadingZeros = $el.valAttr('require-leading-zero') === 'false';
-      return $.formUtils.parseDate(date, dateFormat, addMissingLeadingZeros) !== false;
-    },
-    errorMessage: '',
-    errorMessageKey: 'badDate'
+      var dateParsed = $.formUtils.parseDate(date, dateFormat, addMissingLeadingZeros);
+      //checking date format
+      if (dateParsed === false){
+        this.errorMessage = lang.badDate;
+        return false;
+      }
+      var dateInput = new Date(dateParsed[0], dateParsed[1] - 1, dateParsed[2]);
+      //checking min date, when informed
+      var dateMinValue = $el.valAttr('min-date');
+      if (dateMinValue !== false && $.formUtils.parseDate(dateMinValue, dateFormat, addMissingLeadingZeros) !== false){
+        var dateMinParsed = $.formUtils.parseDate(dateMinValue, dateFormat, addMissingLeadingZeros);
+        var dateMin = new Date(dateMinParsed[0], dateMinParsed[1] - 1, dateMinParsed[2]);
+        if (dateInput < dateMin){    
+          this.errorMessage = lang.badDateBefore + dateMinValue;
+          return false;
+        }
+      }
+      //checking max date, when informed
+      var dateMaxValue = $el.valAttr('max-date');
+      if (dateMaxValue !== false && $.formUtils.parseDate(dateMaxValue, dateFormat, addMissingLeadingZeros) !== false){
+        var dateMaxParsed = $.formUtils.parseDate(dateMaxValue, dateFormat, addMissingLeadingZeros);
+        var dateMax = new Date(dateMaxParsed[0], dateMaxParsed[1] - 1, dateMaxParsed[2]);
+        if (dateInput > dateMax){
+          this.errorMessage = lang.badDateAfter + dateMaxValue;
+          return false;
+        }
+      }
+      return true;
+    }
+    //errorMessage: '', //setted above on the function
+    //errorMessageKey: 'badDate' //not used
   });
 
-
   /*
    * Validate group of checkboxes, validate qty required is checked
    * written by Steve Wasiura : http://stevewasiura.waztech.com