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127 changes: 127 additions & 0 deletions
127
assets/patterns/help-users-when-we-time-them-out-of-a-service/dialog.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| module.exports = { | ||
| displayDialog: function ($elementToDisplay) { | ||
| var $dialog = $('<div id="timeout-dialog" tabindex="-1" role="dialog" class="timeout-dialog">') | ||
| .append($elementToDisplay) | ||
| var $overlay = $('<div id="timeout-overlay" class="timeout-overlay">') | ||
| var resetElementsFunctionList = [] | ||
| var closeCallbacks = [] | ||
|
|
||
| if (!$('html').hasClass('noScroll')) { | ||
| $('html').addClass('noScroll') | ||
| resetElementsFunctionList.push(function () { | ||
| $('html').removeClass('noScroll') | ||
| }) | ||
| } | ||
| $('body').append($dialog).append($overlay) | ||
|
|
||
| resetElementsFunctionList.push(function () { | ||
| $dialog.remove() | ||
| $overlay.remove() | ||
| }) | ||
|
|
||
| // disable the non-dialog page to prevent confusion for VoiceOver users | ||
| $('#skiplink-container, body>header, #global-cookie-message, body>main, body>footer').each(function () { | ||
| var value = $(this).attr('aria-hidden') | ||
| var $elem = $(this) | ||
| resetElementsFunctionList.push(function () { | ||
| if (value) { | ||
| $elem.attr('aria-hidden', value) | ||
| } else { | ||
| $elem.removeAttr('aria-hidden') | ||
| } | ||
| }) | ||
| }).attr('aria-hidden', 'true') | ||
|
|
||
| setupFocusHandlerAndFocusDialog() | ||
| setupKeydownHandler() | ||
| preventMobileScrollWhileAllowingPinchZoom() | ||
|
|
||
| function close() { | ||
| while (resetElementsFunctionList.length > 0) { | ||
| var fn = resetElementsFunctionList.shift() | ||
| fn() | ||
| } | ||
| } | ||
|
|
||
| function closeAndInform() { | ||
| $.each(closeCallbacks, function () { | ||
| var fn = this | ||
| fn() | ||
| }) | ||
| close() | ||
| } | ||
|
|
||
| function setupFocusHandlerAndFocusDialog() { | ||
| function keepFocus(event) { | ||
| var modalFocus = document.getElementById('timeout-dialog') | ||
| if (modalFocus) { | ||
| if (event.target !== modalFocus && !modalFocus.contains(event.target)) { | ||
| event.stopPropagation() | ||
| modalFocus.focus() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| var elemToFocusOnReset = document.activeElement | ||
| $dialog.focus() | ||
|
|
||
| $(document).on('focus', '*', keepFocus) | ||
|
|
||
| resetElementsFunctionList.push(function () { | ||
| $(document).off('focus', '*', keepFocus) | ||
| $(elemToFocusOnReset).focus() | ||
| }) | ||
| } | ||
|
|
||
| function setupKeydownHandler() { | ||
| function keydownListener(e) { | ||
| if (e.keyCode === 27) { | ||
| closeAndInform() | ||
| } | ||
| } | ||
|
|
||
| $(document).on('keydown', keydownListener) | ||
|
|
||
| resetElementsFunctionList.push(function () { | ||
| $(document).off('keydown', keydownListener) | ||
| }) | ||
| } | ||
|
|
||
| function preventMobileScrollWhileAllowingPinchZoom() { | ||
| function handleTouch(e) { | ||
| var touches = e.originalEvent.touches || e.originalEvent.changedTouches || [] | ||
|
|
||
| if (touches.length === 1) { | ||
| e.preventDefault() | ||
| } | ||
| } | ||
|
|
||
| $(document).on('touchmove', handleTouch) | ||
|
|
||
| resetElementsFunctionList.push(function () { | ||
| $(document).off('touchmove', handleTouch) | ||
| }) | ||
| } | ||
|
|
||
| function createSetterFunctionForAttributeOfDialog(attributeName) { | ||
| return function (value) { | ||
| if (value) { | ||
| $dialog.attr(attributeName, value) | ||
| } else { | ||
| $dialog.removeAttr(attributeName) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return { | ||
| closeDialog: function () { | ||
| close() | ||
| }, | ||
| setAriaLive: createSetterFunctionForAttributeOfDialog('aria-live'), | ||
| setAriaLabelledBy: createSetterFunctionForAttributeOfDialog('aria-labelledby'), | ||
| addCloseHandler: function (closeHandler) { | ||
| closeCallbacks.push(closeHandler) | ||
| } | ||
| } | ||
| } | ||
| } |
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