I'm having trouble finding documentation on this.
In Ionic, the menu has functionality where if you click on the backdrop, the menu dismisses. So basically click anywhere except the menu and the menu goes away. I want to disable this functionality so users can interact with items below the backdrop.
I've tried disabling pointer events on the backdrop and the menu, but the dismiss still seems to occur. Any thoughts?
Interesting discovery; the menu dismiss functionality actually looks like it might be on the ion-content. Which leads to an issue:
I want users to be able to interact with the content with ion-content without dismissing the menu.
For me, this helped:
ion-menu {
pointer-events: none;
}
ion-menu > * {
pointer-events: all;
}
Here is the sample code how you can do this in your ionic application.
import { Platform, MenuController } from 'ionic-angular';
// ... Other code
constructor(menuCtrl: MenuController /* ... other code ...*/)
// ... Other code
let menu = menuCtrl.get();
menu.swipeEnable(false); // Disable drag to open/close
// Override default behaviour of closing the menu on
// content or backdrop click
menu['onBackdropClick'] = () => {
// No-op
};
menu.ionOpen.subscribe(() => {
// When the menu is open ...
// Remove Ionic's CSS rules for menu-content-open class that restricts
// mouse events on ion-nav
menu.getContentElement().classList.remove("menu-content-open");
// Reduce the size of the content pane so that it does not
// overflow off the screen
menu.getContentElement().style.width =
`calc(100% - ${menu.getMenuElement().clientWidth}px)`;
});
menu.ionClose.subscribe(() => {
// When the menu is closed ...
// Restore the size of the content pane
menu.getContentElement().style.width = '';
});
I made a stackblitz project you can check it out. You can check it out from here.
I'm developing an app with Angular and Semantic-UI. The app should be accessible, this means it should be compliant with WCAG 2.0.
To reach this purpose the modals should keep focus within the dialog and prevents users from going outside or move with "tabs" between elements of the page that lays under the modal.
I have found some working examples, like the following:
JQuery dialog: https://jqueryui.com/dialog/#modal-confirmation
dialog HTML 5.1 element: https://demo.agektmr.com/dialog
ARIA modal dialog example:
http://w3c.github.io/aria-practices/examples/dialog-modal/dialog.html
(that I have reproduced on Plunker)
Here is my try to create an accessible modal with Semantic-UI: https://plnkr.co/edit/HjhkZg
As you can see I used the following attributes:
role="dialog"
aria-labelledby="modal-title"
aria-modal="true"
But they don't solve my issue. Do you know any way to make my modal keeping focus and lose it only when user click on cancel/confirm buttons?
There is currently no easy way to achieve this. The inert attribute was proposed to try to solve this problem by making any element with the attribute and all of it's children inaccessible. However, adoption has been slow and only recently did it land in Chrome Canary behind a flag.
Another proposed solution is making a native API that would keep track of the modal stack, essentially making everything not currently the top of the stack inert. I'm not sure the status of the proposal, but it doesn't look like it will be implemented any time soon.
So where does that leave us?
Unfortunately without a good solution. One solution that is popular is to create a query selector of all known focusable elements and then trap focus to the modal by adding a keydown event to the last and first elements in the modal. However, with the rise of web components and shadow DOM, this solution can no longer find all focusable elements.
If you always control all the elements within the dialog (and you're not creating a generic dialog library), then probably the easiest way to go is to add an event listener for keydown on the first and last focusable elements, check if tab or shift tab was used, and then focus the first or last element to trap focus.
If you're creating a generic dialog library, the only thing I have found that works reasonably well is to either use the inert polyfill or make everything outside of the modal have a tabindex=-1.
var nonModalNodes;
function openDialog() {
var modalNodes = Array.from( document.querySelectorAll('dialog *') );
// by only finding elements that do not have tabindex="-1" we ensure we don't
// corrupt the previous state of the element if a modal was already open
nonModalNodes = document.querySelectorAll('body *:not(dialog):not([tabindex="-1"])');
for (var i = 0; i < nonModalNodes.length; i++) {
var node = nonModalNodes[i];
if (!modalNodes.includes(node)) {
// save the previous tabindex state so we can restore it on close
node._prevTabindex = node.getAttribute('tabindex');
node.setAttribute('tabindex', -1);
// tabindex=-1 does not prevent the mouse from focusing the node (which
// would show a focus outline around the element). prevent this by disabling
// outline styles while the modal is open
// #see https://www.sitepoint.com/when-do-elements-take-the-focus/
node.style.outline = 'none';
}
}
}
function closeDialog() {
// close the modal and restore tabindex
if (this.type === 'modal') {
document.body.style.overflow = null;
// restore or remove tabindex from nodes
for (var i = 0; i < nonModalNodes.length; i++) {
var node = nonModalNodes[i];
if (node._prevTabindex) {
node.setAttribute('tabindex', node._prevTabindex);
node._prevTabindex = null;
}
else {
node.removeAttribute('tabindex');
}
node.style.outline = null;
}
}
}
The different "working examples" do not work as expected with a screenreader.
They do not trap the screenreader visual focus inside the modal.
For this to work, you have to :
Set the aria-hidden attribute on any other nodes
disable keyboard focusable elements inside those trees (links using tabindex=-1, controls using disabled, ...)
The jQuery :focusable pseudo selector can be useful to find focusable elements.
add a transparent layer over the page to disable mouse selection.
or you can use the css pointer-events: none property when the browser handles it with non SVG elements, not in IE
This focus-trap plugin is excellent at making sure that focus stays trapped inside of dialogue elements.
It sounds like your problem can be broken down into 2 categories:
focus on dialog box
Add a tabindex of -1 to the main container which is the DOM element that has role="dialog". Set the focus to the container.
wrapping the tab key
I found no other way of doing this except by getting the tabbable elements within the dialog box and listening it on keydown. When I know the element in focus (document.activeElement) is the last one on the list, I make it wrap
"focus" events can be intercepted in the capture phase, so you can listen for them at the document.body level, squelch them before they reach the target element, and redirect focus back to a control in your modal dialog. This example assumes a modal dialog with an input element gets displayed and assigned to the variable currDialog:
document.body.addEventListener("focus", (event) => {
if (currDialog && !currDialog.contains(event.target)) {
event.preventDefault();
event.stopPropagation();
currDialog.querySelector("input").focus();
}
}, {capture: true});
You may also want to contain such a dialog in a fixed-position, clear (or low-opacity) backdrop element that takes up the full screen in order to capture and suppress mouse/pointer events, so that no browser feedback (hover, etc.) occurs that could give the user the impression that the background is active.
Don't use any solution requiring you to look up "tabbable" elements. Instead, use keydown and either click events or a backdrop in an effective manor.
(Angular1)
See Asheesh Kumar's answer at https://stackoverflow.com/a/31292097/1754995 for something similar to what I am going for below.
(Angular2-x, I haven't done Angular1 in a while)
Say you have 3 components: BackdropComponent, ModalComponent (has an input), and AppComponent (has an input, the BackdropComponent, and the ModalComponent). You display BackdropComponent and ModalComponent with the correct z-index, both are currently displayed/visible.
What you need to do is have a general window.keydown event with preventDefault() to stop all tabbing when the backdrop/modal component is displayed. I recommend you put that on a BackdropComponent. Then you need a keydown.tab event with stopPropagation() to handle tabbing for the ModalComponent. Both the window.keydown and keydown.tab could probably be in the ModalComponent but there is purpose in a BackdropComponent further than just modals.
This should prevent clicking and tabbing to the AppComponent input and only click or tab to the ModalComponent input [and browser stuffs] when the modal is shown.
If you don't want to use a backdrop to prevent clicking, you can use use click events similarly to the keydown events described above.
Backdrop Component:
#Component({
selector: 'my-backdrop',
host: {
'tabindex': '-1',
'(window:keydown)': 'preventTabbing($event)'
},
...
})
export class BackdropComponent {
...
private preventTabbing(event: KeyboardEvent) {
if (event.keyCode === 9) { // && backdrop shown?
event.preventDefault();
}
}
...
}
Modal Component:
#Component({
selector: 'my-modal',
host: {
'tabindex': '-1',
'(keydown.tab)': 'onTab($event)'
},
...
})
export class ModalComponent {
...
private onTab(event: KeyboardEvent) {
event.stopPropagation();
}
...
}
Here's my solution. It traps Tab or Shift+Tab as necessary on first/last element of modal dialog (in my case found with role="dialog"). Eligible elements being checked are all visible input controls whose HTML may be input,select,textarea,button.
$(document).on('keydown', function(e) {
var target = e.target;
var shiftPressed = e.shiftKey;
// If TAB key pressed
if (e.keyCode == 9) {
// If inside a Modal dialog (determined by attribute role="dialog")
if ($(target).parents('[role=dialog]').length) {
// Find first or last input element in the dialog parent (depending on whether Shift was pressed).
// Input elements must be visible, and can be Input/Select/Button/Textarea.
var borderElem = shiftPressed ?
$(target).closest('[role=dialog]').find('input:visible,select:visible,button:visible,textarea:visible').first()
:
$(target).closest('[role=dialog]').find('input:visible,select:visible,button:visible,textarea:visible').last();
if ($(borderElem).length) {
if ($(target).is($(borderElem))) {
return false;
} else {
return true;
}
}
}
}
return true;
});
we can use the focus trap npm package.
npm i focus-trap
This might help someone who is looking for solution in Angular.
Step 1: Add keydown event on dialog component
#HostListener('document:keydown', ['$event'])
handleTabKeyWInModel(event: any) {
this.sharedService.handleTabKeyWInModel(event, '#modal_id', this.elementRef.nativeElement, 'input,button,select,textarea,a,[tabindex]:not([tabindex="-1"])');
}
This will filters the elements which are preseneted in the Modal dialog.
Step 2: Add common method to handle focus in shared service (or you can add it in your component as well)
handleTabKeyWInModel(e, modelId: string, nativeElement, tagsList: string) {
if (e.keyCode === 9) {
const focusable = nativeElement.querySelector(modelId).querySelectorAll(tagsList);
if (focusable.length) {
const first = focusable[0];
const last = focusable[focusable.length - 1];
const shift = e.shiftKey;
if (shift) {
if (e.target === first) { // shift-tab pressed on first input in dialog
last.focus();
e.preventDefault();
}
} else {
if (e.target === last) { // tab pressed on last input in dialog
first.focus();
e.preventDefault();
}
}
}
}
}
Now this method will take the modal dialog native element and start evaluate on every tab key. Finally we will filter the event on first and last so that we can focus on appropriate elements (on first after last element tab click and on last shift+tab event on first element).
Happy Coding.. :)
I used one of the methods suggested by Steven Lambert, namely, listening to keydown events and intercepting "tab" and "shift+tab" keys. Here's my sample code (Angular 5):
import { Directive, ElementRef, Attribute, HostListener, OnInit } from '#angular/core';
/**
* This directive allows to override default tab order for page controls.
* Particularly useful for working around the modal dialog TAB issue
* (when tab key allows to move focus outside of dialog).
*
* Usage: add "custom-taborder" and "tab-next='next_control'"/"tab-prev='prev_control'" attributes
* to the first and last controls of the dialog.
*
* For example, the first control is <input type="text" name="ctlName">
* and the last one is <button type="submit" name="btnOk">
*
* You should modify the above declarations as follows:
* <input type="text" name="ctlName" custom-taborder tab-prev="btnOk">
* <button type="submit" name="btnOk" custom-taborder tab-next="ctlName">
*/
#Directive({
selector: '[custom-taborder]'
})
export class CustomTabOrderDirective {
private elem: HTMLInputElement;
private nextElemName: string;
private prevElemName: string;
private nextElem: HTMLElement;
private prevElem: HTMLElement;
constructor(
private elemRef: ElementRef
, #Attribute('tab-next') public tabNext: string
, #Attribute('tab-prev') public tabPrev: string
) {
this.elem = this.elemRef.nativeElement;
this.nextElemName = tabNext;
this.prevElemName = tabPrev;
}
ngOnInit() {
if (this.nextElemName) {
var elems = document.getElementsByName(this.nextElemName);
if (elems && elems.length && elems.length > 0)
this.nextElem = elems[0];
}
if (this.prevElemName) {
var elems = document.getElementsByName(this.prevElemName);
if (elems && elems.length && elems.length > 0)
this.prevElem = elems[0];
}
}
#HostListener('keydown', ['$event'])
onKeyDown(event: KeyboardEvent) {
if (event.key !== "Tab")
return;
if (!event.shiftKey && this.nextElem) {
this.nextElem.focus();
event.preventDefault();
}
if (event.shiftKey && this.prevElem) {
this.prevElem.focus();
event.preventDefault();
}
}
}
To use this directive, just import it to your module and add to Declarations section.
I've been successful using Angular Material's A11yModule.
Using your favorite package manager install these to packages into your Angular app.
**"#angular/material": "^10.1.2"**
**"#angular/cdk": "^10.1.2"**
In your Angular module where you import the Angular Material modules add this:
**import {A11yModule} from '#angular/cdk/a11y';**
In your component HTML apply the cdkTrapFocus directive to any parent element, example: div, form, etc.
Run the app, tabbing will now be contained within the decorated parent element.
For jquery users:
Assign role="dialog" to your modal
Find first and last interactive element inside the dialog modal.
Check if current target is one of them(depending on shift key is
pressed or not).
If target element is one of first or last interactive element of the
dialog, return false
Working code sample:
//on keydown inside dialog
$('.modal[role=dialog]').on('keydown', e => {
let target = e.target;
let shiftPressed = e.shiftKey;
// If TAB is pressed
if (e.keyCode === 9) {
// Find first and last element in the ,modal-dialog parent.
// Elements must be interactive i.e. visible, and can be Input/Select/Button/Textarea.
let first = $(target).closest('[role=dialog]').find('input:visible,select:visible,button:visible,textarea:visible').first();
let last = $(target).closest('[role=dialog]').find('input:visible,select:visible,button:visible,textarea:visible').last();
let borderElem = shiftPressed ? first : last //border element on the basis of shift key pressed
if ($(borderElem).length) {
return !$(target).is($(borderElem)); //if target is border element , return false
}
}
return true;
});
I read through most of the answers, while the package focus-trap seems like a good option. #BenVida shared a very simple VanillaJS solution here in another Stack Overflow post.
Here is the code:
const container=document.querySelector("_selector_for_the_container_")
//optional: needed only if the container element is not focusable already
container.setAttribute("tabindex","0")
container.addEventListener("focusout", (ev)=>{
if (!container.contains(ev.relatedTarget)) container.focus()
})
Is there any openui5 event Handler for orientationchange and window resize ?
onInit: function() {
var data;
this.drawChart(data); // working fine
$( window ).resize(function() {
this.drawChart(data); // not working
});
},
drawChart: function(data) {
//code for draw chart
}
OpenUI5 has built-in functionality for detecting orientation change as well as when there is a responsive size change (desktop->tablet for example).
Take a look at sap.ui.Device.orientation's attachHandler event:
Registers the given event handler to orientation change events of the
document's window.
Here is an example of using sap.ui.Device.orientation.attachHandler:
sap.ui.Device.orientation.attachHandler(function(mParams) {
if (mParams.landscape) {
alert('in landscape mode');
} else {
alert('in portrait mode');
}
});
Also of use is sap.ui.Device.media's attachHandler for detecting when the window is resized to a different range-set.
For directly listening to when the window is resized it looks like you already have a solution for that, just make sure you keep track of the correct scope to use:
var self = this;
$( window ).resize(function() {
self.drawChart(data);
});
I found the solution
this.* will not work inside jquery as this has a different meaning wherever its encapsulated...
in openui5 *.view.js this implies the view object
in *.controller.js this implies the controller object...
in jquery this implies the component in which it is placed or whatever it is referring to in that context...
you cannot simply mix "this" wherever you like
sap.ui.controller("oui5mvc.controllerName").drawChart(data);
I would like to be able to move around (on the greyed-out background, by dragging and dropping) the modal form that is provided by Bootstrap 2. Can anyone tell me what the best practice for achieving this is?
The bootstrap doesn't come with any dragging and dropping functionality by default, but you can add a little jQuery UI spice into the mix to get the effect you're looking for. For example, using the draggable interaction from the framework you can target your modal ID to allow it to be dragged around within the modal backdrop.
Try this:
JS
$("#myModal").draggable({
handle: ".modal-header"
});
Demo, edit here.
Update: bootstrap3 demo
Whatever draggable option you go for, you might want to turn off the *-transition properties for .modal.fade in bootstrap’s CSS file, or at least write some JS that temporarily disables them during dragging. Otherwise, the modal doesn’t drag exactly as you would expect.
You can use a little script likes this.
simplified from Draggable without jQuery UI
(function ($) {
$.fn.drags = function (opt) {
opt = $.extend({
handle: "",
cursor: "move"
}, opt);
var $selected = this;
var $elements = (opt.handle === "") ? this : this.find(opt.handle);
$elements.css('cursor', opt.cursor).on("mousedown", function (e) {
var pos_y = $selected.offset().top - e.pageY,
pos_x = $selected.offset().left - e.pageX;
$(document).on("mousemove", function (e) {
$selected.offset({
top: e.pageY + pos_y,
left: e.pageX + pos_x
});
}).on("mouseup", function () {
$(this).off("mousemove"); // Unbind events from document
});
e.preventDefault(); // disable selection
});
return this;
};
})(jQuery);
example : $("#someDlg").modal().drags({handle:".modal-header"});
Building on previous answers utilizing jQuery UI, this, included once, will apply to all your modals and keep the modal on screen, so users don't accidentally move the header off screen so they can no longer access the handle. Also sets the cursor to 'move' for better discoverability.
$(document).on('shown.bs.modal', function(evt) {
let $modal = $(evt.target);
$modal.find('.modal-content').draggable({
handle: ".modal-header",
containment: $modal
});
$modal.find('.modal-header').css('cursor', 'move')
});
evt.target is the .modal which is the translucent overlay behind the actual .modal-content.
jquery UI is large and can conflict with bootstrap.
An alternative is DragDrop.js: http://kbjr.github.io/DragDrop/index.html
DragDrop.bind($('#myModal')[0], {
anchor: $('#myModal .modal-header')
});
You still have to deal with transitions, as #user535673 suggests. I just remove the fade class from my dialog.
I would like to have a fixed element (a DIV) in the iFrame for my Facebook Application. So when the user scrolls down the page, that element is still fixed on the top of the browser window?
The basic: You add stuff to a bag, while you are scrolling down, and a fixed DIV will show you your "score" while you add these things to the bag. The "score counter" should always be visible while scrolling.
Thank you!
This is not possible if you are using facebook's iframe auto-resize features. Once the iframe is resized so that scrolling is not necessary, the only scroll available will be the one of the parent window. However, the child iframe has no information about the scroll of the parent window (since they are not on the same domain...) and trying to listen to scroll events or scroll position will only return that the scrollbar is at position 0, or topmost.
You can however listen to click events and extract the offset of the click event or the clicked element.
Some examples:
$('.clickme').click(function(e) {
e.preventDefault();
var top;
// Using click position (e.pageY and e.pageX available)
top = e.pageY;
// Using clicked element position
top = $(this).offset().top;
$('#moveme').css({'top': top - 100 + 'px'}); //
}
Maybe you can base your interaction on this principle instead?
I don't know about you Erik but this really doens not help me much.
Could FB.Canvas.getPageInfo help?
Maybe that would help : I was ussing
(function() {
var el = $("header:first");
var elpos_original = el.offset().top;
$(window).scroll(function(){
var elpos = el.offset().top;
var windowpos = $(window).scrollTop();
var finaldestination = windowpos;
if(windowpos<elpos_original) {
finaldestination = elpos_original;
el.stop().css({'top':0});
} else {
el.stop().animate({'top':finaldestination-elpos_original},0);
}
});
})();