477 lines
13 KiB
JavaScript
477 lines
13 KiB
JavaScript
/**
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* @file Manages the multi-step navigation.
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*/
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jQuery(function ($) {
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var $userform = $('.userform');
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// Settings that come from the CMS.
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var CONSTANTS = {
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ENABLE_LIVE_VALIDATION: $userform.data('livevalidation') !== void 0,
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DISPLAY_ERROR_MESSAGES_AT_TOP: $userform.data('toperrors') !== void 0,
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HIDE_FIELD_LABELS: $userform.data('hidefieldlabels') !== void 0
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};
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// Common functions that extend multiple classes.
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var commonMixin = {
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/**
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* @func show
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* @desc Show the form step. Looks after aria attributes too.
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*/
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show: function () {
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this.$el.attr('aria-hidden', false).show();
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},
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/**
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* @func hide
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* @desc Hide the form step. Looks after aria attributes too.
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*/
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hide: function () {
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this.$el.attr('aria-hidden', true).hide();
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}
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};
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/**
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* @func UserForm
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* @constructor
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* @param {object} element
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* @return {object} - The UserForm instance.
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* @desc The form
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*/
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function UserForm(element) {
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var self = this;
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this.$el = element instanceof jQuery ? element : $(element);
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this.steps = [];
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// Listen for events triggered my form steps.
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this.$el.on('userform.step.prev', function (e) {
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self.prevStep();
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});
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this.$el.on('userform.step.next', function (e) {
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self.nextStep();
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});
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// Listen for events triggered by the progress bar.
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$('#userform-progress').on('userform.progress.changestep', function (e, stepNumber) {
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self.jumpToStep(stepNumber - 1);
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});
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this.$el.validate(this.validationOptions);
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return this;
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}
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/*
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* Default options for step validation. These get extended in main().
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*/
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UserForm.prototype.validationOptions = {
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ignore: ':hidden',
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errorClass: 'required',
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errorElement: 'span',
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errorPlacement: function (error, element) {
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error.addClass('message');
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if(element.is(':radio') || element.parents('.checkboxset').length > 0) {
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error.insertAfter(element.closest('ul'));
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} else {
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error.insertAfter(element);
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}
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},
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success: function (error) {
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var errorId = $(error).attr('id');
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error.remove();
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if (CONSTANTS.DISPLAY_ERROR_MESSAGES_AT_TOP) {
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// Pass the field's ID with the event.
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$userform.trigger('userform.form.valid', [errorId.substr(0, errorId.indexOf('-error'))]);
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}
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}
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};
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/**
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* @func UserForm.addStep
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* @param {object} step - An instance of FormStep.
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* @desc Adds a step to the UserForm.
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*/
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UserForm.prototype.addStep = function (step) {
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// Make sure we're dealing with a form step.
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if (!step instanceof FormStep) {
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return;
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}
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this.steps.push(step);
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};
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/**
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* @func UserForm.setCurrentStep
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* @param {object} step - An instance of FormStep.
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* @desc Sets the step the user is currently on.
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*/
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UserForm.prototype.setCurrentStep = function (step) {
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// Make sure we're dealing with a form step.
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if (!step instanceof FormStep) {
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return;
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}
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this.currentStep = step;
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this.currentStep.show();
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// Record the user has viewed the step.
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step.viewed = true;
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step.$el.addClass('viewed');
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};
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/**
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* @func UserForm.jumpToStep
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* @param {number} stepNumber
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* @desc Jumps to a specific form step.
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*/
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UserForm.prototype.jumpToStep = function (stepNumber) {
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var targetStep = this.steps[stepNumber];
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// Make sure the target step exists.
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if (targetStep === void 0) {
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return;
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}
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// Validate the current section.
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// Users can navigate to step's they've already viewed
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// even if the current step is invalid.
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if (!this.$el.valid() && targetStep.viewed === false) {
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return;
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}
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this.currentStep.hide();
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this.setCurrentStep(targetStep);
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this.$el.trigger('userform.form.changestep', [stepNumber]);
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};
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/**
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* @func UserForm.nextStep
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* @desc Advances the form to the next step.
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*/
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UserForm.prototype.nextStep = function () {
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this.jumpToStep(this.steps.indexOf(this.currentStep) + 1);
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};
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/**
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* @func UserForm.prevStep
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* @desc Goes back one step (not bound to browser history).
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*/
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UserForm.prototype.prevStep = function () {
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this.jumpToStep(this.steps.indexOf(this.currentStep) - 1);
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};
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/**
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* @func ErrorContainer
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* @constructor
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* @param {object} element - The error container element.
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* @return {object} - The ErrorContainer instance.
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* @desc Creates an error container. Used to display step error messages at the top.
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*/
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function ErrorContainer(element) {
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this.$el = element instanceof jQuery ? element : $(element);
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// Set the error container's heading.
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this.$el.find('h4').text(ss.i18n._t('UserForms.ERROR_CONTAINER_HEADER', 'Please correct the following errors and try again:'));
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return this;
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}
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/**
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* @func hasErrors
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* @return boolean
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* @desc Checks if the error container has any error messages.
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*/
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ErrorContainer.prototype.hasErrors = function () {
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return this.$el.find('.error-list').children().length > 0;
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};
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/**
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* @func removeErrorMessage
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* @desc Removes an error message from the error container.
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*/
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ErrorContainer.prototype.removeErrorMessage = function (fieldId) {
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this.$el.find('#' + fieldId + '-top-error').remove();
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// If there are no more error then hide the container.
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if (!this.hasErrors()) {
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this.hide();
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}
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};
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/**
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* @func ErrorContainer.updateErrorMessage
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* @param {object} $input - The jQuery input object which contains the field to validate.
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* @param {object} message - The error message to display (html escaped).
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* @desc Update an error message (displayed at the top of the form).
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*/
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ErrorContainer.prototype.updateErrorMessage = function ($input, message) {
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var inputID = $input.attr('id'),
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anchor = '#' + inputID,
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elementID = inputID + '-top-error',
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messageElement = $('#' + elementID),
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describedBy = $input.attr('aria-describedby');
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// The 'message' param will be an empty string if the field is valid.
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if (!message) {
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// Style issues as fixed if they already exist
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messageElement.addClass('fixed');
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return;
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}
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messageElement.removeClass('fixed');
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this.show();
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if (messageElement.length === 1) {
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// Update the existing error message.
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messageElement.show().find('a').html(message);
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} else {
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// Generate better link to field
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$input.closest('.field[id]').each(function(){
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anchor = '#' + $(this).attr('id');
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});
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// Add a new error message
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messageElement = $('<li><a></a></li>');
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messageElement
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.attr('id', elementID)
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.find('a')
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.attr('href', location.pathname + location.search + anchor)
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.html(message);
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this.$el.find('ul').append(messageElement);
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// link back to original input via aria
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// Respect existing non-error aria-describedby
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if (!describedBy) {
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describedBy = elementID;
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} else if (!describedBy.match(new RegExp('\\b' + elementID + '\\b'))) {
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// Add to end of list if not already present
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describedBy += " " + elementID;
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}
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$input.attr('aria-describedby', describedBy);
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}
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};
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/**
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* @func FormStep
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* @constructor
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* @param {object} element
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* @return {object} - The FormStep instance.
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* @desc Creates a form step.
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*/
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function FormStep(element) {
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var self = this;
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this.$el = element instanceof jQuery ? element : $(element);
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// Has the step been viewed by the user?
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this.viewed = false;
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this.hide();
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// Bind the step navigation event listeners.
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this.$el.find('.step-button-prev').on('click', function (e) {
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e.preventDefault();
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self.$el.trigger('userform.step.prev');
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});
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this.$el.find('.step-button-next').on('click', function (e) {
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e.preventDefault();
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self.$el.trigger('userform.step.next');
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});
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if (CONSTANTS.DISPLAY_ERROR_MESSAGES_AT_TOP) {
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this.errorContainer = new ErrorContainer(this.$el.find('.error-container'));
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// Listen for errors on the UserForm.
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$userform.on('userform.form.error', function (e, validator) {
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// The step only cares about errors if it's currently visible.
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if (!self.$el.is(':visible')) {
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return;
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}
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// Add or update each error in the list.
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$.each(validator.errorList, function (i, error) {
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self.errorContainer.updateErrorMessage($(error.element), error.message);
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});
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});
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// Listen for fields becoming valid
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$userform.on('userform.form.valid', function (e, fieldId) {
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self.errorContainer.removeErrorMessage(fieldId);
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});
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}
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return this;
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}
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/**
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* @func ProgressBar
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* @constructor
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* @param {object} element
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* @return {object} - The Progress bar instance.
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* @desc Creates a progress bar.
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*/
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function ProgressBar(element) {
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var self = this;
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this.$el = element instanceof jQuery ? element : $(element);
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this.$buttons = this.$el.find('.step-button-jump');
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this.$jsAlign = this.$el.find('.js-align');
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// Update the progress bar when 'step' buttons are clicked.
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this.$buttons.each(function (i, stepButton) {
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$(stepButton).on('click', function (e) {
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e.preventDefault();
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self.$el.trigger('userform.progress.changestep', [parseInt($(this).text(), 10)]);
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});
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});
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// Update the progress bar when 'prev' and 'next' buttons are clicked.
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$userform.on('userform.form.changestep', function (e, newStep) {
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self.update(newStep + 1);
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});
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// Spaces out the steps below progress bar evenly
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this.$jsAlign.each(function (index, button) {
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var $button = $(button),
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leftPercent = (100 / (self.$jsAlign.length - 1) * index + '%'),
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buttonOffset = -1 * ($button.innerWidth() / 2);
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$button.css({left: leftPercent, marginLeft: buttonOffset});
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});
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this.update(1);
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return this;
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}
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/**
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* @func ProgressBar.update
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* @param {number} newStep
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* @desc Update the progress element to show a new step.
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*/
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ProgressBar.prototype.update = function (newStep) {
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var $newStepElement = $($('.form-step')[newStep - 1]);
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// Update elements that contain the current step number.
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this.$el.find('.current-step-number').each(function (i, element) {
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$(element).text(newStep);
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});
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// Update aria attributes.
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this.$el.find('[aria-valuenow]').each(function (i, element) {
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$(element).attr('aria-valuenow', newStep);
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});
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// Update the CSS classes on step buttons.
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this.$buttons.each(function (i, element) {
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var $element = $(element),
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$item = $element.parent();
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if (parseInt($element.text(), 10) === newStep) {
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$item.addClass('current viewed');
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$element.removeAttr('disabled');
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return;
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}
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$item.removeClass('current');
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});
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// Update the progress bar's title with the new step's title.
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this.$el.find('.progress-title').text($newStepElement.data('title'));
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// Update the width of the progress bar.
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this.$el.find('.progress-bar').width((newStep - 1) / (this.$buttons.length - 1) * 100 + '%');
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};
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/**
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* @func main
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* @desc Bootstraps the front-end.
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*/
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function main() {
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var userform = null,
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progressBar = null;
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// Extend classes with common functionality.
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$.extend(FormStep.prototype, commonMixin);
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$.extend(ErrorContainer.prototype, commonMixin);
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// Extend the default validation options with conditional options
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// that are set by the user in the CMS.
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if (CONSTANTS.ENABLE_LIVE_VALIDATION) {
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$.extend(UserForm.prototype.validationOptions, {
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onfocusout: function (element) {
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this.element(element);
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}
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});
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}
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if (CONSTANTS.DISPLAY_ERROR_MESSAGES_AT_TOP) {
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$.extend(UserForm.prototype.validationOptions, {
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// Callback for custom code when an invalid form / step is submitted.
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invalidHandler: function (event, validator) {
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$userform.trigger('userform.form.error', [validator]);
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},
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onfocusout: false
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});
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}
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// Display all the things that are hidden when JavaScript is disabled.
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$('.userform-progress, .step-navigation').attr('aria-hidden', false).show();
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userform = new UserForm($userform);
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progressBar = new ProgressBar($('#userform-progress'));
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// Conditionally hide field labels and use HTML5 placeholder instead.
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if (CONSTANTS.HIDE_FIELD_LABELS) {
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$userform.find('label.left').each(function () {
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var $label = $(this);
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$('[name="' + $label.attr('for') + '"]').attr('placeholder', $label.text());
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$label.remove();
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});
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}
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// Initialise the form steps.
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userform.$el.find('.form-step').each(function (i, element) {
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var step = new FormStep(element);
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userform.addStep(step);
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});
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userform.setCurrentStep(userform.steps[0]);
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// Hide the form-wide actions on multi-step forms.
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// Because JavaScript is enabled we'll use the actions contained
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// in the final step's navigation.
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if (userform.steps.length > 1) {
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userform.$el.children('.Actions').attr('aria-hidden', true).hide();
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}
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// Enable jQuery UI datepickers
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$(document).on('click', 'input.text[data-showcalendar]', function() {
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var $element = $(this);
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$element.ssDatepicker();
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if($element.data('datepicker')) {
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$element.datepicker('show');
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}
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});
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// Make sure the form doesn't expire on the user. Pings every 3 mins.
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setInterval(function () {
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$.ajax({ url: 'UserDefinedForm_Controller/ping' });
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}, 180 * 1000);
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}
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main();
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});
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