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dialog.js
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150 lines (128 loc) · 4.18 KB
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import $ from 'jquery';
// Outdented for a simpler diff
var focusableElementsSelector = "a[href], area[href], input:not([disabled]), select:not([disabled]), textarea:not([disabled]), button:not([disabled]), iframe, object, embed, *[tabindex], *[contenteditable]";
// Based on the incredible accessible modal dialog.
function AccessibleDialog( modalDiv, $returnElement, title, closeButtonLabel) {
this.title = title;
this.closeButtonLabel = closeButtonLabel;
this.focusedElementBeforeModal = $returnElement;
this.baseId = $(modalDiv).attr('id') || Math.floor(Math.random() * 1000000000).toString();
var thisObj = this;
var modal = modalDiv;
this.modal = modal;
modal.addClass('able-modal-dialog');
var closeButton = $('<button>',{
'class': 'modalCloseButton',
'title': thisObj.closeButtonLabel,
'aria-label': thisObj.closeButtonLabel
}).text('×');
closeButton.on( 'keydown', function (e) {
if (e.key === ' ') {
thisObj.hide();
}
}).on( 'click', function () {
thisObj.hide();
});
var titleH1 = $('<h1></h1>');
titleH1.attr('id', 'modalTitle-' + this.baseId);
titleH1.text(title);
this.titleH1 = titleH1;
modal.attr({
'aria-labelledby': 'modalTitle-' + this.baseId,
});
var modalHeader = $( '<div>', {
'class': 'able-modal-header'
});
modalHeader.prepend(titleH1);
modalHeader.prepend(closeButton);
modal.prepend(modalHeader);
modal.attr({
'aria-hidden': 'true',
'role': 'dialog',
'aria-modal': 'true'
});
modal.on( 'keydown', function (e) {
if (e.key === 'Escape') {
thisObj.hide();
e.preventDefault();
} else if (e.key === 'Tab') {
// Manually loop tab navigation inside the modal.
var parts = modal.find('*');
var focusable = parts.filter(focusableElementsSelector).filter(':visible');
if (focusable.length === 0) {
return;
}
var focused = $(':focus');
var currentIndex = focusable.index(focused);
if (e.shiftKey) {
// If backwards from first element, go to last.
if (currentIndex === 0) {
focusable.get(focusable.length - 1).trigger('focus');
e.preventDefault();
}
} else {
if (currentIndex === focusable.length - 1) {
focusable.get(0).trigger('focus');
e.preventDefault();
}
}
}
e.stopPropagation();
});
if ( $( 'body' ).hasClass( 'able-modal-active' ) ) {
$( 'body > *') .not('.able-modal-overlay').not('.able-modal-dialog').removeAttr('inert');
$( 'body' ).removeClass( 'able-modal-active' );
}
};
AccessibleDialog.prototype.show = function () {
if (!this.overlay) {
// Generate overlay.
var overlay = $('<div></div>').attr({
'class': 'able-modal-overlay',
'tabindex': '-1'
});
this.overlay = overlay;
$('body').append(overlay);
// Keep from moving focus out of dialog when clicking outside of it.
overlay.on('mousedown.accessibleModal', function (e) {
e.preventDefault();
thisObj.hide();
});
}
$('body > *').not('.able-modal-overlay').not('.able-modal-dialog').attr('inert', true);
$( 'body' ).addClass( 'able-modal-active' );
this.overlay.css('display', 'block');
this.modal.css('display', 'block');
this.modal.attr({
'aria-hidden': 'false',
'tabindex': '-1'
});
var focusable = this.modal.find("*").filter(focusableElementsSelector).filter(':visible');
if (focusable.length === 0) {
this.focusedElementBeforeModal.blur();
}
var thisObj = this;
setTimeout(function () {
// set focus on the first focusable element
thisObj.modal.find('button.modalCloseButton').first().trigger('focus');
}, 300);
};
AccessibleDialog.prototype.hide = function () {
if (this.overlay) {
this.overlay.css('display', 'none');
}
this.modal.css('display', 'none');
this.modal.attr('aria-hidden', 'true');
$('body > *').not('.able-modal-overlay').not('.able-modal-dialog').removeAttr('inert');
$( 'body' ).removeClass( 'able-modal-active' );
this.focusedElementBeforeModal.trigger('focus');
};
AccessibleDialog.prototype.getInputs = function () {
// return an array of input elements within this dialog
if (this.modal) {
var inputs = this.modal.find('input');
return inputs;
}
return false;
};
export default AccessibleDialog;