// Get plugin instance
var bootstrapValidator = $(form).data('bootstrapValidator');
// and then call method
bootstrapValidator.methodName(parameters)

$(form).bootstrapValidator(methodName, parameters);

// The first way
$(form)
  .data('bootstrapValidator')
  .updateStatus('birthday', 'NOT_VALIDATED')
  .validateField('birthday');

// The second one
$(form)
  .bootstrapValidator('updateStatus', 'birthday', 'NOT_VALIDATED')
  .bootstrapValidator('validateField', 'birthday');

$('#defaultForm').bootstrapValidator({
 fields: {
   username: {
 message: 'The username is not valid',
 validators: {
   notEmpty: {
  message: 'The username is required and can\'t be empty'
   }
 }
   }
 }，
 submitHandler: function(validator, form, submitButton) {
   // a)
   // Use Ajax to submit form data
   //$.post(form.attr('action'), form.serialize(), function(result) {
 // ... process the result ...
   //}, 'json');

   //b)
   // Do your task
   // ...
   // Submit the form
   validator.defaultSubmit();
 }
});

$('#loginForm').bootstrapValidator({
    message: 'This value is not valid',
    feedbackIcons: {
      valid: 'glyphicon glyphicon-ok',
      invalid: 'glyphicon glyphicon-remove',
      validating: 'glyphicon glyphicon-refresh'
    },
    submitHandler: function(validator, form, submitButton) {
      $.post(form.attr('action'), form.serialize(), function(result) {
        // The result is a JSON formatted by your back-end
        // I assume the format is as following:
        // {
        //   valid: true,     // false if the account is not found
        //   username: 'Username', // null if the account is not found
        // }
        if (result.valid == true || result.valid == 'true') {
          // You can reload the current location
          window.location.reload();

          // Or use Javascript to update your page, such as showing the account name
          // $('#welcome').html('Hello ' + result.username);
        } else {
          // The account is not found
          // Show the errors
          $('#errors').html('The account is not found').removeClass('hide');

          // Enable the submit buttons
          $('#loginForm').bootstrapValidator('disableSubmitButtons', false);
        }
      }, 'json');
    },
    fields: {
      username: {
        validators: {
          notEmpty: {
            message: 'The username is required'
          }
        }
      },
      password: {
        validators: {
          notEmpty: {
            message: 'The password is required'
          }
        }
      }
    }
  });

 // Enable the password/confirm password validators if the password is not empty
  $('#signupForm').find('[name="password"]').on('keyup', function() {
    var isEmpty = $(this).val() == '';
    $('#signupForm').bootstrapValidator('enableFieldValidators', 'password', !isEmpty)
            .bootstrapValidator('enableFieldValidators', 'confirm_password', !isEmpty);
    if ($(this).val().length == 1) {
      $('#signupForm').bootstrapValidator('validateField', 'password')
              .bootstrapValidator('validateField', 'confirm_password');
    }
  });

$("#isAllValid").on("click", function(){
 alert($("#defaultForm").data('bootstrapValidator').isValid());
});

$("#isAllValid").on("click", function(){
 alert($("#defaultForm").data('bootstrapValidator').isValid());
 if(!$("#defaultForm").data('bootstrapValidator').isValid()) {
 $("#defaultForm").data('bootstrapValidator').resetForm();
 }
});

$('#defaultForm').bootstrapValidator({
 fields: {
   username: {
 message: 'The username is not valid',
 validators: {
   notEmpty: {
  message: 'The username is required and can\'t be empty'
   }
 }
   }，
   stringLength: {
 min: 6,
 max: 30,
 message: 'The username must be more than 6 and less than 30 characters long'
   }
 }
});

$("#setname").on("click", function(){
 $("input[name=username]").val('san');
 var bootstrapValidator = $("#defaultForm").data('bootstrapValidator');
 bootstrapValidator.updateStatus('username', 'NOT_VALIDATED').validateField('username'); 
 //错误提示信息变了
});

$(form).bootstrapValidator(options).bootstrapValidator('validate');

// or
$(form).bootstrapValidator(options);
$(form).data('bootstrapValidator').validate();