silverstripe-userforms/javascript/UserForm.js

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/**
* @file Manages the multi-step navigation.
*/
jQuery(function ($) {
// A reference to the UserForm instance.
var userform = null;
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// Settings that come from the CMS.
var CONSTANTS = {};
// Common functions that extend multiple classes.
var commonMixin = {
/**
* @func show
* @desc Show the form step. Looks after aria attributes too.
*/
show: function () {
this.$el.attr('aria-hidden', false).show();
},
/**
* @func hide
* @desc Hide the form step. Looks after aria attributes too.
*/
hide: function () {
this.$el.attr('aria-hidden', true).hide();
}
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};
/**
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* @func UserForm
* @constructor
* @param {object} element
* @return {object} - The UserForm instance.
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* @desc The form
*/
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function UserForm(element) {
var self = this;
this.$el = element instanceof jQuery ? element : $(element);
this.steps = [];
// Add an error container which displays a list of invalid steps on form submission.
this.errorContainer = new ErrorContainer(this.$el.children('.error-container'));
// Listen for events triggered by form steps.
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this.$el.on('userform.action.prev', function (e) {
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self.prevStep();
});
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this.$el.on('userform.action.next', function (e) {
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self.nextStep();
});
// Listen for events triggered by the progress bar.
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$('#userform-progress').on('userform.progress.changestep', function (e, stepNumber) {
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self.jumpToStep(stepNumber - 1);
});
// When a field becomes valid, remove errors from the error container.
this.$el.on('userform.form.valid', function (e, fieldId) {
self.errorContainer.removeStepLink(fieldId);
});
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this.$el.validate(this.validationOptions);
// Ensure checkbox groups are validated correctly
$('.optionset.requiredField input').each(function() {
$(this).rules('add', {
required: true
});
});
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return this;
}
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/*
* Default options for step validation. These get extended in main().
*/
UserForm.prototype.validationOptions = {
ignore: ':hidden',
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errorClass: 'error',
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errorElement: 'span',
errorPlacement: function (error, element) {
error.addClass('message');
if (element.is(':radio') || element.parents('.checkboxset').length > 0) {
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error.insertAfter(element.closest('ul'));
} else if (element.parents('.checkbox').length > 0) {
error.insertAfter(element.next('label'));
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} else {
error.insertAfter(element);
}
},
invalidHandler: function (event, validator) {
//setTimeout 0 so it runs after errorPlacement
setTimeout(function () {
validator.currentElements.filter('.error').first().focus();
}, 0);
},
// Callback for handling the actual submit when the form is valid.
// Submission in the jQuery.validate sence is handled at step level.
// So when the final step is submitted we have to also check all previous steps are valid.
submitHandler: function (form, e) {
var isValid = true;
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// validate the current step
if(userform.currentStep) {
userform.currentStep.valid = $(form).valid();
}
// Check for invalid previous steps.
$.each(userform.steps, function (i, step) {
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if (!step.valid && !step.conditionallyHidden()) {
isValid = false;
userform.errorContainer.addStepLink(step);
}
});
if (isValid) {
form.submit();
} else {
userform.errorContainer.show();
}
},
// When a field becomes valid.
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success: function (error) {
var errorId = $(error).attr('id'),
fieldId = errorId.substr(0, errorId.indexOf('-error')),
isCheckboxGroup = $(error).closest('.requiredField').hasClass('checkboxset');
// We need to escapse the field id if it's a checkboxfield
// because jQuery breaks when using selector that end with
// square brackets.
if (isCheckboxGroup) {
fieldId = fieldId.replace('[]', '\\\\[\\\\]');
}
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error.remove();
// Pass the field's ID with the event.
userform.$el.trigger('userform.form.valid', [fieldId]);
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}
};
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/**
* @func UserForm.addStep
* @param {object} step - An instance of FormStep.
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* @desc Adds a step to the UserForm.
*/
UserForm.prototype.addStep = function (step) {
// Make sure we're dealing with a form step.
if (!step instanceof FormStep) {
return;
}
step.id = this.steps.length;
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this.steps.push(step);
};
/**
* @func UserForm.setCurrentStep
* @param {object} step - An instance of FormStep.
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* @desc Sets the step the user is currently on.
*/
UserForm.prototype.setCurrentStep = function (step) {
// Make sure we're dealing with a form step.
if (!(step instanceof FormStep)) {
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return;
}
this.currentStep = step;
this.currentStep.show();
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// Record the user has viewed the step.
step.viewed = true;
step.$el.addClass('viewed');
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};
/**
* @func UserForm.jumpToStep
* @param {number} stepNumber
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* @param {boolean} [direction] - Defaults to forward (true).
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* @desc Jumps to a specific form step.
*/
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UserForm.prototype.jumpToStep = function (stepNumber, direction) {
var targetStep = this.steps[stepNumber],
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isValid = false,
forward = direction === void 0 ? true : direction;
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// Make sure the target step exists.
if (targetStep === void 0) {
return;
}
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// Make sure the step we're trying to set as current is not
// hidden by custom display rules. If it is then jump to the next step.
if (targetStep.conditionallyHidden()) {
if (forward) {
this.jumpToStep(stepNumber + 1);
} else {
this.jumpToStep(stepNumber - 1);
}
return;
}
// Validate the form.
// This well effectivly validate the current step and not the entire form.
// This is because hidden fields are excluded from validation, and all fields
// on all other steps, are currently hidden.
isValid = this.$el.valid();
// Set the 'valid' property on the current step.
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this.currentStep.valid = isValid;
// Users can navigate to step's they've already viewed even if the current step is invalid.
if (isValid === false && targetStep.viewed === false) {
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return;
}
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this.currentStep.hide();
this.setCurrentStep(targetStep);
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this.$el.trigger('userform.form.changestep', [targetStep.id]);
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};
/**
* @func UserForm.nextStep
* @desc Advances the form to the next step.
*/
UserForm.prototype.nextStep = function () {
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this.jumpToStep(this.steps.indexOf(this.currentStep) + 1, true);
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};
/**
* @func UserForm.prevStep
* @desc Goes back one step (not bound to browser history).
*/
UserForm.prototype.prevStep = function () {
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this.jumpToStep(this.steps.indexOf(this.currentStep) - 1, false);
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};
/**
* @func ErrorContainer
* @constructor
* @param {object} element - The error container element.
* @return {object} - The ErrorContainer instance.
* @desc Creates an error container. Used to display step error messages at the top.
*/
function ErrorContainer(element) {
this.$el = element instanceof jQuery ? element : $(element);
// Set the error container's heading.
this.$el.find('h4').text(ss.i18n._t('UserForms.ERROR_CONTAINER_HEADER', 'Please correct the following errors and try again:'));
return this;
}
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/**
* @func hasErrors
* @return boolean
* @desc Checks if the error container has any error messages.
*/
ErrorContainer.prototype.hasErrors = function () {
return this.$el.find('.error-list').children().length > 0;
};
/**
* @func removeErrorMessage
* @desc Removes an error message from the error container.
*/
ErrorContainer.prototype.removeErrorMessage = function (fieldId) {
this.$el.find('#' + fieldId + '-top-error').remove();
// If there are no more error then hide the container.
if (!this.hasErrors()) {
this.hide();
}
};
/**
* @func addStepLink
* @param {object} step - FormStep instance.
* @desc Adds a link to a form step as an error message.
*/
ErrorContainer.prototype.addStepLink = function (step) {
var self = this,
itemID = step.$el.attr('id') + '-error-link',
$itemElement = this.$el.find('#' + itemID),
stepID = step.$el.attr('id'),
stepTitle = step.$el.data('title');
// If the item already exists we don't need to do anything.
if ($itemElement.length) {
return;
}
$itemElement = $('<li id="' + itemID + '"><a href="#' + stepID + '">' + stepTitle + '</a></li>');
$itemElement.on('click', function (e) {
e.preventDefault();
userform.jumpToStep(step.id);
});
this.$el.find('.error-list').append($itemElement);
};
/**
* @func removeStepLink
* @param {object} step - FormStep instance.
* @desc Removes a step link from the error container.
*/
ErrorContainer.prototype.removeStepLink = function (fieldId) {
var stepID = $('#' + fieldId).closest('.form-step').attr('id');
this.$el.find('#' + stepID + '-error-link').remove();
// Hide the error container if we've just removed the last error.
if (this.$el.find('.error-list').is(':empty')) {
this.hide();
}
};
/**
* @func ErrorContainer.updateErrorMessage
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* @param {object} $input - The jQuery input object which contains the field to validate.
* @param {object} message - The error message to display (html escaped).
* @desc Update an error message (displayed at the top of the form).
*/
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ErrorContainer.prototype.updateErrorMessage = function ($input, message) {
var inputID = $input.attr('id'),
anchor = '#' + inputID,
elementID = inputID + '-top-error',
messageElement = $('#' + elementID),
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describedBy = $input.attr('aria-describedby');
// The 'message' param will be an empty string if the field is valid.
if (!message) {
// Style issues as fixed if they already exist
messageElement.addClass('fixed');
return;
}
messageElement.removeClass('fixed');
this.show();
if (messageElement.length === 1) {
// Update the existing error message.
messageElement.show().find('a').html(message);
} else {
// Generate better link to field
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$input.closest('.field[id]').each(function(){
anchor = '#' + $(this).attr('id');
});
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// Add a new error message
messageElement = $('<li><a></a></li>');
messageElement
.attr('id', elementID)
.find('a')
.attr('href', location.pathname + location.search + anchor)
.html(message);
this.$el.find('ul').append(messageElement);
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// link back to original input via aria
// Respect existing non-error aria-describedby
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if (!describedBy) {
describedBy = elementID;
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} else if (!describedBy.match(new RegExp('\\b' + elementID + '\\b'))) {
// Add to end of list if not already present
describedBy += " " + elementID;
}
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$input.attr('aria-describedby', describedBy);
}
};
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/**
* @func FormStep
* @constructor
* @param {object} element
* @return {object} - The FormStep instance.
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* @desc Creates a form step.
*/
function FormStep(element) {
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var self = this;
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this.$el = element instanceof jQuery ? element : $(element);
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// Find button for this step
this.$elButton = $(".step-button-wrapper[data-for='" + this.$el.prop('id') + "']");
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// Has the step been viewed by the user?
this.viewed = false;
// Is the form step valid?
// This value is used on form submission, which fails, if any of the steps are invalid.
this.valid = false;
// The internal id of the step. Used for getting the step from the UserForm.steps array.
this.id = null;
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this.hide();
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if (CONSTANTS.DISPLAY_ERROR_MESSAGES_AT_TOP) {
this.errorContainer = new ErrorContainer(this.$el.find('.error-container'));
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// Listen for errors on the UserForm.
userform.$el.on('userform.form.error', function (e, validator) {
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// The step only cares about errors if it's currently visible.
if (!self.$el.is(':visible')) {
return;
}
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// Add or update each error in the list.
$.each(validator.errorList, function (i, error) {
self.errorContainer.updateErrorMessage($(error.element), error.message);
});
});
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// Listen for fields becoming valid
userform.$el.on('userform.form.valid', function (e, fieldId) {
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self.errorContainer.removeErrorMessage(fieldId);
});
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}
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// Ensure that page visibilty updates the step navigation
this
.$elButton
.on('userform.field.hide userform.field.show', function(){
userform.$el.trigger('userform.form.conditionalstep');
});
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return this;
}
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/**
* Determine if this step is conditionally disabled
*
* @returns {Boolean}
*/
FormStep.prototype.conditionallyHidden = function(){
// Because the element itself could be visible but 0 height, so check visibility of button
return ! this
.$elButton
.find('button')
.is(':visible');
};
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/**
* @func ProgressBar
* @constructor
* @param {object} element
* @return {object} - The Progress bar instance.
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* @desc Creates a progress bar.
*/
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.$el.find('.js-align');
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// Update the progress bar when 'step' buttons are clicked.
this.$buttons.each(function (i, stepButton) {
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$(stepButton).on('click', function (e) {
e.preventDefault();
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self.$el.trigger('userform.progress.changestep', [parseInt($(this).text(), 10)]);
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});
});
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// Update the progress bar when 'prev' and 'next' buttons are clicked.
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userform.$el.on('userform.form.changestep', function (e, stepID) {
self.update(stepID);
});
// Listen for steps being conditionally shown / hidden by display rules.
// We need to update step related UI like the number of step buttons
// and any text that shows the total number of steps.
userform.$el.on('userform.form.conditionalstep', function () {
// Update the step numbers on the buttons.
var $visibleButtons = self.$buttons.filter(':visible');
$visibleButtons.each(function (i, button) {
$(button).text(i + 1);
});
// Update the actual progress bar.
self.$el.find('.progress-bar').attr('aria-valuemax', $visibleButtons.length);
// Update any text that uses the total number of steps.
self.$el.find('.total-step-number').text($visibleButtons.length);
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});
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// Spaces out the steps below progress bar evenly
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this.$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);
$button.css({left: leftPercent, marginLeft: buttonOffset});
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// First and last buttons are kept within userform-progress container
if (index === self.$jsAlign.length - 1) {
$button.css({marginLeft: buttonOffset * 2});
} else if (index === 0) {
$button.css({marginLeft: 0});
}
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});
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this.update(0);
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return this;
}
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/**
* @func ProgressBar.update
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* @param {number} stepID - Zero based index of the new step.
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* @desc Update the progress element to show a new step.
*/
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ProgressBar.prototype.update = function (stepID) {
var $newStepElement = $($('.form-step')[stepID]),
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stepNumber = 0,
barWidth = stepID / (this.$buttons.length - 1) * 100;
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// Set the current step number.
this.$buttons.each(function (i, button) {
if (i > stepID) {
return false; // break the loop
}
if ($(button).is(':visible')) {
stepNumber += 1;
}
});
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// Update elements that contain the current step number.
this.$el.find('.current-step-number').each(function (i, element) {
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$(element).text(stepNumber);
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});
// Update aria attributes.
this.$el.find('[aria-valuenow]').each(function (i, element) {
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$(element).attr('aria-valuenow', stepNumber);
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});
// Update the CSS classes on step buttons.
this.$buttons.each(function (i, element) {
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var $element = $(element),
$item = $element.parent();
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if (parseInt($element.text(), 10) === stepNumber && $element.is(':visible')) {
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$item.addClass('current viewed');
$element.removeAttr('disabled');
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return;
}
$item.removeClass('current');
});
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// Update the progress bar's title with the new step's title.
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this.$el.siblings('.progress-title').text($newStepElement.data('title'));
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// Update the width of the progress bar.
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barWidth = barWidth ? barWidth + '%' : '';
this.$el.find('.progress-bar').width(barWidth);
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};
/**
* @func FormActions
* @constructor
* @param {object} element
* @desc Creates the navigation and actions (Prev, Next, Submit buttons).
*/
function FormActions (element) {
var self = this;
this.$el = element instanceof jQuery ? element : $(element);
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this.$prevButton = this.$el.find('.step-button-prev');
this.$nextButton = this.$el.find('.step-button-next');
// Show the buttons.
this.$prevButton.parent().attr('aria-hidden', false).show();
this.$nextButton.parent().attr('aria-hidden', false).show();
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// Bind the step navigation event listeners.
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this.$prevButton.on('click', function (e) {
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e.preventDefault();
self.$el.trigger('userform.action.prev');
});
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this.$nextButton.on('click', function (e) {
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e.preventDefault();
self.$el.trigger('userform.action.next');
});
// Listen for changes to the current form step, or conditional pages,
// so we can show hide buttons appropriatly.
userform.$el.on('userform.form.changestep userform.form.conditionalstep', function () {
self.update();
});
this.update();
return this;
}
/**
* @func FormAcrions.update
* @param {number} stepID - Zero based ID of the current step.
* @desc Updates the form actions element to reflect the current state of the page.
*/
FormActions.prototype.update = function () {
var numberOfSteps = userform.steps.length,
stepID = userform.currentStep.id,
i, lastStep;
// Update the "Prev" button.
this.$el.find('.step-button-prev')[stepID === 0 ? 'hide' : 'show']();
// Find last step, skipping hidden ones
for(i = numberOfSteps - 1; i >= 0; i--) {
lastStep = userform.steps[i];
// Skip if step is hidden
if(lastStep.conditionallyHidden()) {
continue;
}
// Update the "Next" button.
this.$el.find('.step-button-next')[stepID >= i ? 'hide' : 'show']();
// Update the "Actions".
this.$el.find('.Actions')[stepID >= i ? 'show' : 'hide']();
// Stop processing last step
break;
}
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};
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/**
* @func main
* @desc Bootstraps the front-end.
*/
function main() {
var progressBar = null,
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formActions = null,
$userform = $('.userform');
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// If there's no userform, do nothing.
if ($userform.length === 0) {
return;
}
CONSTANTS.ENABLE_LIVE_VALIDATION = $userform.data('livevalidation') !== void 0;
CONSTANTS.DISPLAY_ERROR_MESSAGES_AT_TOP = $userform.data('toperrors') !== void 0;
CONSTANTS.HIDE_FIELD_LABELS = $userform.data('hidefieldlabels') !== void 0;
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// Extend the default validation options with conditional options
// that are set by the user in the CMS.
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if (CONSTANTS.ENABLE_LIVE_VALIDATION === false) {
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$.extend(UserForm.prototype.validationOptions, {
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onfocusout: false
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});
}
if (CONSTANTS.DISPLAY_ERROR_MESSAGES_AT_TOP) {
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$.extend(UserForm.prototype.validationOptions, {
// Callback for custom code when an invalid form / step is submitted.
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invalidHandler: function (event, validator) {
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$userform.trigger('userform.form.error', [validator]);
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},
onfocusout: false
});
}
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// Display all the things that are hidden when JavaScript is disabled.
$('.userform-progress, .step-navigation').attr('aria-hidden', false).show();
// Extend classes with common functionality.
$.extend(FormStep.prototype, commonMixin);
$.extend(ErrorContainer.prototype, commonMixin);
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userform = new UserForm($userform);
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// Conditionally hide field labels and use HTML5 placeholder instead.
if (CONSTANTS.HIDE_FIELD_LABELS) {
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$userform.find('label.left').each(function () {
var $label = $(this);
$('[name="' + $label.attr('for') + '"]').attr('placeholder', $label.text());
$label.remove();
});
}
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// Initialise the form steps.
userform.$el.find('.form-step').each(function (i, element) {
var step = new FormStep(element);
userform.addStep(step);
});
userform.setCurrentStep(userform.steps[0]);
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// Initialise actions and progressbar
progressBar = new ProgressBar($('#userform-progress'));
formActions = new FormActions($('#step-navigation'));
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// Enable jQuery UI datepickers
$(document).on('click', 'input.text[data-showcalendar]', function() {
var $element = $(this);
$element.ssDatepicker();
if($element.data('datepicker')) {
$element.datepicker('show');
}
});
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// Make sure the form doesn't expire on the user. Pings every 3 mins.
setInterval(function () {
$.ajax({ url: 'UserDefinedForm_Controller/ping' });
}, 180 * 1000);
}
main();
});