martin-g commented on a change in pull request #361: WICKET-6666 initial
checkin of new ModalDialog
URL: https://github.com/apache/wicket/pull/361#discussion_r283633541
##########
File path:
wicket-extensions/src/main/java/org/apache/wicket/extensions/ajax/markup/html/modal/ModalDialog.js
##########
@@ -0,0 +1,424 @@
+/*
+ *
+ * FEATURES
+ * - When modal is closed focus is restored to the element that had it before
the modal was opened
+ * - Focus is trapped inside the modal when using tab/shift-tab
+ * - Focus is set on the first focusable element in the modal when it is opened
+ * - On Escape or click outside the modal a button with class x-modal-close
will be clicked
+ * - Secondary close buttons can be added and marked with
x-modal-close-secondary. Clicking these buttons forwards the
+ * click to the primary x-modal-close button
+ * - Aria support
+ * - Various aria attributes added to the modal making it behave as a dialog
to screen readers
+ * - aria-labelledby will be added if the modal content contains an element
with x-modal-title class
+ * - adia-describedby will be added if the modal content contains an element
with x-modal-description class
+ *
+ * ENTRY POINTS
+ * - window.wicket.modal.open: function(element, options)
+ * - element: string|dom|jquery - dom element that will be body of modal
+ * - options: object, see description below
+ * - window.wicket.modal.close: function(element)
+ * - element: string|dom|jquery - dom element that was specified as body of
modal
+ *
+ * OPTIONS
+ * validate: boolean
+ * - when modal is opened several checks will be performed
+ * - error when modal content does not contain an element with x-modal-close
class
+ * - warning when modal content does not contain an element with
modal-description class
+ * - error when modal does not contain any focusable elements
+ * console: object
+ * - an object used for reporting validation errors
+ * - must have error(object...) method
+ * - must have warn(object...) method
+ *
+ * ROADMAP
+ * - Set max height of content as 80% of screen, also provide option later
+ * - Open full screen on small screens - css fix only via media queries?
+ * - Support for simultaneously opened modals - testing to make sure it works
ok or do we need to implement stack tracking
+ *
+ */
+;
+(function($, window, document, console, undefined) {
+ 'use strict';
+
+ if (window.wicket && window.wicket.modal) {
+ return;
+ }
+
+ var DATA_KEY = "modal-dialog-data";
+ var OVERLAY_SELECTOR = ".modal-dialog-overlay";
+ var CONTAINER_SELECTOR = ".modal-dialog";
+ var SCROLL_SELECTOR=".modal-dialog-scroll-area";
+ var CONTENT_SELECTOR = ".modal-dialog-content";
+ var CLOSE_SELECTOR = ".x-modal-close";
+ var SECONDARY_CLOSE_SELECTOR = ".x-modal-close-secondary";
+
+ //
+ // UTILITY METHODS
+ //
+
+ /** Retreives id of the element, creates one if none */
+ var getOrCreateIdCounter = 0;
+ function getOrCreateId(element) {
+ if (!element.attr("id")) {
+ element.attr("id", "modal-autoid-" +
(getOrCreateIdCounter++));
+ }
+ return element.attr("id");
+ }
+
+ /**
+ * Resolves a value to a dom node, useful when parsing arguments passed
to
+ * functions
+ */
+ function resolveDomNode(element) {
+ if ((typeof element) === "string") {
+ return $(document.getElementById(element));
+ } else if (element.tagName) {
+ return $(element);
+ } else if (element instanceof $) {
+ return element;
+ }
+ throw new Error("Cannot resolve value: " + element + " to dom
node");
+ }
+
+ /** Finds all elements inside container that can receive focus */
+ function findFocusable(container) {
+ var focusables = 'a[href], area[href], input:not([disabled]),
select:not([disabled]), textarea:not([disabled]), button:not([disabled]),
iframe, object, embed, *[tabindex], *[contenteditable]';
+ return container.find(focusables).filter(":visible");
+ }
+
+ /**
+ * Finds all elements inside the container that can receive focus via
the
+ * tab key
+ */
+ function findTabbable(container) {
+ return findFocusable(container).not("*[tabindex=-1]");
+ }
+
+ /** Focuses the first element inside the modal */
+ function focusDefaultFocusable(container) {
+ var matches = findFocusable(container);
+ var first = matches.not(".modal-dialog-close").first();
+ if (first.length > 0) {
+ first.focus();
+ } else {
+ matches.first().focus();
+ }
+ }
+
+ /**
+ * Finds and clicks the close button inside the modal. Returns true if
+ * button was found.
+ */
+ function findAndClickCloseButton(container) {
+ var matches = container.find(CLOSE_SELECTOR).filter(":visible");
+ if (matches.length > 0) {
+ matches.first().click();
+ return true;
+ } else {
+ return false;
+ }
+ }
+
+ //
+ // BEHAVIORS
+ //
+ // Behaviors are event listeners that get called from open and close
+ // methods, they allow various aspects of code such as focus management
and
+ // aria attribute management to be decoupled from each other making the
+ // overall code cleaner and easier to maintain.
+ //
+ // The structure of a behavior is an object with the following
properties:
+ // initialize: function()
+ // - called before first modal is opened
+ // destroy: function()
+ // - called after last modal is closed
+ // prepare: function(overlayElement, contentElement, data)
+ // - called after overlay dom is constructed, but before it is inserted
+ // - into main dom
+ // open: function(overlayElement, contentElement, data)
+ // - called after overlayElement is inserted into main dom
+ // close: function(overlayElement, contentElement, data)
+ // - called after overlayElement is removed from main dom
+
+ //Scroll settings to remember for ios scroll to top issue. Currently,
ios allows body
+ //scrolling unless body is set to position: fixed, which causes the
window to scroll to top.
+ var scrollTop;
+
+ /** Behavior that appends a css class to body as long as any modal is
open */
+ var appendBodyClassBehavior = {
+
+ initialize : function() {
+ var body = $("body");
+ body.addClass("modal-dialog-open
modal-dialog-no-scroll");
+
+ scrollTop = $(window).scrollTop();
+
+ if (!!navigator.platform &&
/iPad|iPhone|iPod/.test(navigator.platform)) {
+ body.addClass("modal-dialog-open-ios");
+ }
+ },
+ terminate : function() {
+ $("body").removeClass("modal-dialog-open
modal-dialog-no-scroll modal-dialog-open-ios");
+ if (!!navigator.platform &&
/iPad|iPhone|iPod/.test(navigator.platform)) {
+ $(window).scrollTop(scrollTop);
+ }
+ }
+ };
+
+ /**
+ * Behavior that memorizes the focussed element when dialog is opened,
and
+ * returns focus to it when dialog is closed
+ */
+ var returnFocusOnCloseBehavior = {
+ open : function(overlay, element, data) {
+ data.opener = document.activeElement;
+ if (data.options.validate) {
+ if (!data.opener || $(data.opener).is("body")) {
+ data.options.console.error("Error
saving focused element when opening the modal, it is either none or body: ",
+ data.opener);
+ }
+ }
+ },
+ close : function(overlay, element, data) {
+ if (data.opener) {
+ try {
+ data.opener.focus();
+ } catch (error) {
+ if (data.options.validate) {
+ data.options.console.error(
+ "Error
restoring focus after modal is closed. Attempted to set focus to element, but
got an exception",
+ data.opener,
error);
+ }
+ throw error;
+ }
+ }
+ }
+ }
+
+ /** Takes care of adding any necessary aria-related attributes to the
dialog */
+ var addAriaAttributesBehavior = {
+ prepare : function(overlay, element, data) {
+ var content = overlay.find(CONTENT_SELECTOR);
+ var attrs = {
+ "role" : "dialog",
+ "aria-modal" : "true"
+ };
+
+ var title = element.find(".x-modal-title").first();
+ if (title.length > 0) {
+ attrs["aria-labelledby"] = getOrCreateId(title);
+ } else if (data.options.validate) {
+ data.options.console.error("No .x-modal-title
element present in modal content: ", element.get(0));
+ }
+
+ var description =
element.find(".x-modal-description").first();
+ if (description.length > 0) {
+ attrs["aria-describedby"] =
getOrCreateId(description);
+ } else if (data.options.validate) {
+ data.options.console.warn("No
.x-modal-description element present in modal content: ", element.get(0));
+ }
+
+ content.attr(attrs);
+ }
+ }
+
+ /** Closes the modal if the overlay is clicked or an escape key is
pressed */
+ var closeOnOverlayClickOrEscapeBehavior = {
+ prepare : function(overlay, element, data) {
+ if (data.options.closeOnClickOutside) {
+ overlay.on("click.modal-dialog", function
(event) {
+ if
($(event.target).closest(CONTENT_SELECTOR).length === 0) {
+ // clicked outside modal's
content
+
findAndClickCloseButton(element);
+ }
+ });
+ }
+ if (data.options.closeOnEscape) {
+ overlay.on("keydown", function (event) {
+ if (event.which == 27) {
Review comment:
JSHint (once ModalDialog.js is added to
testing/wicket-js-tests/Gruntfile.js) will complain here on `==`. We should use
`===` instead.
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