@atlassian/aui/src/js/aui/form-validation.js

import $ from './jquery';
import './form-notification';
import {appendDescription, appendErrorMessages, getMessageContainer, setFieldSpinner} from './form-notification';
import './form-validation/basic-validators';
import amdify from './internal/amdify';
import * as deprecate from './internal/deprecation';
import globalize from './internal/globalize';
import skate from './internal/skate';
import validatorRegister from './form-validation/validator-register';

//Attributes
const ATTRIBUTE_VALIDATION_OPTION_PREFIX = 'aui-validation-';
const ATTRIBUTE_NOTIFICATION_PREFIX = 'data-aui-notification-';

const ATTRIBUTE_FIELD_STATE = 'aui-validation-state';
const INVALID = 'invalid';
const VALID = 'valid';
const VALIDATING = 'validating';
const UNVALIDATED = 'unvalidated';

const ATTRIBUTE_VALIDATION_FIELD_COMPONENT = 'data-aui-validation-field';

//Classes
const CLASS_VALIDATION_INITIALISED = '_aui-form-validation-initialised';

//Events
const EVENT_FIELD_STATE_CHANGED = '_aui-internal-field-state-changed';

function isFieldInitialised($field) {
    return $field.hasClass(CLASS_VALIDATION_INITIALISED);
}

function initValidation($field) {
    if (!isFieldInitialised($field)) {
        prepareFieldMarkup($field);
        bindFieldEvents($field);
        changeFieldState($field, UNVALIDATED);
    }
}

function prepareFieldMarkup($field){
    $field.addClass(CLASS_VALIDATION_INITIALISED);
    appendDescription($field);
}

function bindFieldEvents($field) {
    bindStopTypingEvent($field);
    bindValidationEvent($field);
}

function bindStopTypingEvent($field){
    var keyUpTimer;

    var triggerStopTypingEvent = function () {
        $field.trigger('aui-stop-typing');
    };

    $field.on('keyup', function () {
        clearTimeout(keyUpTimer);
        keyUpTimer = setTimeout(triggerStopTypingEvent, 1500);
    });
}

function bindValidationEvent($field) {
    var validateWhen = getValidationOption($field, 'when');
    var watchedFieldID = getValidationOption($field, 'watchfield');

    var elementsToWatch = watchedFieldID ? $field.add('#' + watchedFieldID) : $field;

    elementsToWatch.on(validateWhen, function startValidation () {
        validationTriggeredHandler($field);
    });
}

function validationTriggeredHandler($field) {
    var noValidate = getValidationOption($field, 'novalidate');

    if (noValidate) {
        changeFieldState($field, VALID);
        return;
    }

    return startValidating($field);
}

function getValidationOption($field, option) {
    var defaults = {
        'when': 'change'
    };
    var optionValue = $field.attr('data-' + ATTRIBUTE_VALIDATION_OPTION_PREFIX + option);
    if (!optionValue) {
        optionValue = defaults[option];
    }

    return optionValue;
}

function startValidating($field) {
    clearFieldMessages($field);

    var validatorsToRun = getActivatedValidators($field);

    changeFieldState($field, VALIDATING);
    var deferreds = runValidatorsAndGetDeferred($field, validatorsToRun);
    var fieldValidators = $.when.apply($, deferreds);
    fieldValidators.done(function () {
        changeFieldState($field, VALID);
    });
    return fieldValidators;
}

function clearFieldMessages($field) {
    setFieldNotification(getDisplayField($field), 'none');
}

function getValidators() {
    return validatorRegister.validators();
}

function getActivatedValidators($field) {
    var callList = [];
    getValidators().forEach(function (validator, index) {
        var validatorTrigger = validator.validatorTrigger;
        var runThisValidator = $field.is(validatorTrigger);
        if (runThisValidator) {
            callList.push(index);
        }
    });

    return callList;
}

function runValidatorsAndGetDeferred($field, validatorsToRun) {
    var allDeferreds = [];

    validatorsToRun.forEach(function (validatorIndex) {
        var validatorFunction = getValidators()[validatorIndex].validatorFunction;
        var deferred = new $.Deferred();
        var validatorContext = createValidatorContext($field, deferred);
        validatorFunction(validatorContext);

        allDeferreds.push(deferred);
    });

    return allDeferreds;
}

function createValidatorContext($field, validatorDeferred) {
    var context = {
        validate: function () {
            validatorDeferred.resolve();
        },
        invalidate: function (message) {
            changeFieldState($field, INVALID, message);
            validatorDeferred.reject();
        },
        args: createArgumentAccessorFunction($field),
        el: $field[0],
        $el: $field
    };

    deprecate.prop(context, '$el', {
        sinceVersion: '5.9.0',
        removeInVersion: '10.0.0',
        alternativeName: 'el',
        extraInfo: 'See https://ecosystem.atlassian.net/browse/AUI-3263.'
    });

    return context;
}

function createArgumentAccessorFunction($field) {
    return function (arg) {
        return $field.attr('data-' + ATTRIBUTE_VALIDATION_OPTION_PREFIX + arg) || $field.attr(arg);
    };
}

function changeFieldState($field, state, message) {
    $field.attr('data-' + ATTRIBUTE_FIELD_STATE, state);

    if (state === UNVALIDATED) {
        return;
    }

    $field.trigger($.Event(EVENT_FIELD_STATE_CHANGED));

    var $displayField = getDisplayField($field);

    var stateToNotificationTypeMap = {};
    stateToNotificationTypeMap[VALIDATING] = 'wait';
    stateToNotificationTypeMap[INVALID] = 'error';
    stateToNotificationTypeMap[VALID] = 'success';

    var notificationType = stateToNotificationTypeMap[state];

    if (state === VALIDATING) {
        showSpinnerIfSlow($field);
    } else {
        setFieldNotification($displayField, notificationType, message);
    }

}

function showSpinnerIfSlow($field) {
    setTimeout(function () {
        let stillValidating = getFieldState($field) === VALIDATING;
        if (stillValidating) {
            setFieldNotification($field, 'wait');
            setFieldSpinner($field, true)
        }
    }, 500);
}

function setFieldNotification($field, type, message) {
    const spinnerWasVisible = isSpinnerVisible($field);
    removeIconOnlyNotifications($field);
    const skipShowingSuccessNotification = (type === 'success') && !spinnerWasVisible;
    if (skipShowingSuccessNotification) {
        return;
    }

    if (type === 'none') {
        removeFieldNotification($field, 'error');
    } else {
        const previousMessage = $field.attr(ATTRIBUTE_NOTIFICATION_PREFIX + type) || '[]';
        const newMessages = message ? combineJSONMessages(message, previousMessage) : [];
        $field.attr(ATTRIBUTE_NOTIFICATION_PREFIX + type, JSON.stringify(newMessages));
        if (type === 'error') {
            appendErrorMessages($field, newMessages);
        }
    }
}

function removeIconOnlyNotifications($field) {
    removeFieldNotification($field, 'wait');
    setFieldSpinner($field, false);
    removeFieldNotification($field, 'success');
}

function removeFieldNotification($field, type) {
    $field.removeAttr(ATTRIBUTE_NOTIFICATION_PREFIX + type);
    if (type === 'error') {
        getMessageContainer($field, type).remove();
    }
}

function isSpinnerVisible($field) {
    return $field.is('[' + ATTRIBUTE_NOTIFICATION_PREFIX + 'wait]');
}

function combineJSONMessages(newString, previousString) {
    const previousStackedMessageList = JSON.parse(previousString);
    return previousStackedMessageList.concat([newString]);
}

function getDisplayField($field) {
    var displayFieldID = getValidationOption($field, 'displayfield');
    var notifyOnSelf = (displayFieldID === undefined);
    return notifyOnSelf ? $field : $('#' + displayFieldID);
}

function getFieldState($field) {
    return $field.attr('data-' + ATTRIBUTE_FIELD_STATE);
}

/**
 * Trigger validation on a field manually
 * @param $field the field that validation should be triggered for
 */
function validateField($field) {
    $field = $($field);
    validationTriggeredHandler($field);
}

/**
 * Form scrolling and submission prevent based on validation state
 * -If the form is unvalidated, validate all fields
 * -If the form is invalid, go to the first invalid element
 * -If the form is validating, wait for them to validate and then try submitting again
 * -If the form is valid, allow form submission
 */
$(document).on('submit', function (e) {
    var form = e.target;
    var $form = $(form);

    var formState = getFormStateName($form);
    if (formState === UNVALIDATED) {
        delaySubmitUntilStateChange($form, e);
        validateUnvalidatedFields($form);
    } else if (formState === VALIDATING) {
        delaySubmitUntilStateChange($form, e);
    } else if (formState === INVALID) {
        e.preventDefault();
        selectFirstInvalid($form);
    } else if (formState === VALID) {
        var validSubmitEvent = $.Event('aui-valid-submit');
        $form.trigger(validSubmitEvent);
        var preventNormalSubmit = validSubmitEvent.isDefaultPrevented();
        if (preventNormalSubmit) {
            e.preventDefault(); //users can bind to aui-valid-submit for ajax forms
        }
    }
});

function delaySubmitUntilStateChange($form, event) {
    event.preventDefault();
    $form.one(EVENT_FIELD_STATE_CHANGED, function () {
        $form.trigger('submit');
    });
}

function getFormStateName($form) {
    var $fieldCollection = $form.find('.' + CLASS_VALIDATION_INITIALISED);
    var fieldStates = getFieldCollectionStateNames($fieldCollection);
    var wholeFormState = mergeStates(fieldStates);
    return wholeFormState;
}

function getFieldCollectionStateNames($fields) {
    var states = $.map($fields, function (field) {
        return getFieldState($(field));
    });
    return states;
}

function mergeStates(stateNames) {
    var containsInvalidState = stateNames.indexOf(INVALID) !== -1;
    var containsUnvalidatedState = stateNames.indexOf(UNVALIDATED) !== -1;
    var containsValidatingState = stateNames.indexOf(VALIDATING) !== -1;

    if (containsInvalidState) {
        return INVALID;
    } else if (containsUnvalidatedState) {
        return UNVALIDATED;
    } else if (containsValidatingState) {
        return VALIDATING;
    } else {
        return VALID;
    }
}

function validateUnvalidatedFields($form) {
    var $unvalidatedElements = getFieldsInFormWithState($form, UNVALIDATED);
    $unvalidatedElements.each(function (index, el) {
        validator.validate($(el));
    });
}

function selectFirstInvalid($form) {
    var $firstInvalidField = getFieldsInFormWithState($form, INVALID).first();
    $firstInvalidField.focus();
}

function getFieldsInFormWithState($form, state) {
    var selector = '[data-' + ATTRIBUTE_FIELD_STATE + '=' + state + ']';
    return $form.find(selector);
}


const validator = {
    register: validatorRegister.register,
    validate: validateField
};

skate(ATTRIBUTE_VALIDATION_FIELD_COMPONENT, {
    attached: function (field) {
        if (field.form) {
            field.form.setAttribute('novalidate', 'novalidate');
        }
        var $field = $(field);
        initValidation($field);
        skate.init(field); //needed to kick off form notification skate initialisation
    },
    type: skate.type.ATTRIBUTE
});

amdify('aui/form-validation', validator);
globalize('formValidation', validator);
export default validator;