I'm building an accessible website and trying to manage focus. I need to open a modal and then put focus on the first element in the modal then trap the focus until the modal is closed ("canceled" or "accepted").
HTML
<a href="" ng-click="modalshow = !modalshow; modal.open();">Open Modal</a>
<div ng-show="modalshow" id="modal">
<h3 id="tofs" >Terms of Service</h3>
<p>Lorem Ipsum Lorem Ipsum Lorem Ipsum Lorem Ipsum </p>
<span>Cancel</span>
<span>Accept/span>
</div>
<h2>Seprate Content</h2>
Javascript
angular.module('app')
.controller('Controller', modalCtrl);
function modalCtrl() {
$scope.modal = {
open: function() {
angular.element('#tofs').focus();
}
}
}
Just like the name it's given, trap focus works by setting a trap for your subject. Once your subject moves into your trap, and your camera registers it as being in-focus, the shutter will release.
Bootstrap 4: by open the first modal, the focus is a trap inside it (you can move the focus with tab key and you will never focus element outside the modal). When you open the second modal the focus is a trap inside it and again you can't focus outside element (this is right).
tab, shift + tab and enter key and focus should be trapped inside modal and should not go out after pressing tab key multiple times.
angular.element("html").on("focusin", "body", function (event) {
if(angular.element("#modal:visible").length>0){
event.preventDefault();
event.stopPropagation();
angular.element('#tofs').focus();
}
});
you can add this code to trap all focus events to h3 tag when modal is visible.
There's a directive called ngBlur, that fires an event when an element loses focus. Try executing your focus function on ng-blur
Here: https://docs.angularjs.org/api/ng/directive/ngBlur
An example: http://jsbin.com/hemaye/1/edit?html,js,output
You cannot ever select the 2nd input box because of the ng-blur statement
There is multiple possibility to trap the focus.
One solution is to manually set tabindex="-1"
temporarily on all the elements in the background of your modal when it is showed (and remove this tabindex, or revert to original tabindex when leaving modal).
Another solution is to look at how angular-bootstrap plan to fix this issue : https://github.com/angular-ui/bootstrap/issues/738
You can also look at the WAI ARIA page, they have a related content about it : http://www.w3.org/TR/wai-aria-practices/#trap_focus_div
Okay after way too much searching, this is what I came up with. Basically I created ng-focus functions on the last element in the modal and the next element following the modal. This way I could check if the focus existed within the modal and if not, I would loop the focus back to the top.
<a href="" ng-click="modalshow = !modalshow; modal.open();">Open Modal</a>
<div ng-show="modalshow" id="modal">
<h3 id="tofs" >Terms of Service</h3>
<p>Lorem Ipsum Lorem Ipsum Lorem Ipsum Lorem Ipsum </p>
<a href="" ng-focus="modalshow.onFocus($event)">Cancel</a>
<a href="" ng-focus="modalshow.onFocus($event)">Accept</a>
</div>
<h2>Seprate Content</h2>
<a href="" ng-focus="modalshow.onFocus($event)">next link<a>
Javascript
angular.module('app')
.controller('Controller', modalCtrl);
function modalCtrl() {
$scope.modal = {
open: function() {
angular.element('#tofs').focus();
},
onFocus: function(){
var modal = angular.element('#modal')[0];
if (!modal.contains( event.target ) && $scope.modalIsOpen) {
event.stopPropagation();
angular.element('#tofs').focus();
}
}
}
}
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