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Remove redundant details polyfill

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We're now using the GOV.UK Frontend one.
This commit is contained in:
Tom Byers
2019-12-13 09:50:04 +00:00
parent 5dce31fc55
commit 84f90a7e1c
1 changed files with 0 additions and 196 deletions
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196
app/assets/javascripts/detailsPolyfill.js
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@@ -1,196 +0,0 @@
// From
// https://github.com/alphagov/govuk_elements/blob/4926897dc7734db2fc5e5ebb6acdc97f86e22e50/public/javascripts/vendor/details.polyfill.js
//
// ---
//
// <details> polyfill
// http://caniuse.com/#feat=details
// FF Support for HTML5's <details> and <summary>
// https://bugzilla.mozilla.org/show_bug.cgi?id=591737
// http://www.sitepoint.com/fixing-the-details-element/
(function () {
'use strict';
var NATIVE_DETAILS = typeof document.createElement('details').open === 'boolean';
// Add event construct for modern browsers or IE
// which fires the callback with a pre-converted target reference
function addEvent(node, type, callback) {
if (node.addEventListener) {
node.addEventListener(type, function (e) {
callback(e, e.target);
}, false);
} else if (node.attachEvent) {
node.attachEvent('on' + type, function (e) {
callback(e, e.srcElement);
});
}
}
// Handle cross-modal click events
function addClickEvent(node, callback) {
// Prevent space(32) from scrolling the page
addEvent(node, 'keypress', function (e, target) {
if (target.nodeName === 'SUMMARY') {
if (e.keyCode === 32) {
if (e.preventDefault) {
e.preventDefault();
} else {
e.returnValue = false;
}
}
}
});
// When the key comes up - check if it is enter(13) or space(32)
addEvent(node, 'keyup', function (e, target) {
if (e.keyCode === 13 || e.keyCode === 32) { callback(e, target); }
});
addEvent(node, 'mouseup', function (e, target) {
callback(e, target);
});
}
// Get the nearest ancestor element of a node that matches a given tag name
function getAncestor(node, match) {
do {
if (!node || node.nodeName.toLowerCase() === match) {
break;
}
} while ((node = node.parentNode));
return node;
}
// Create a started flag so we can prevent the initialisation
// function firing from both DOMContentLoaded and window.onload
var started = false;
// Initialisation function
function addDetailsPolyfill(list) {
// If this has already happened, just return
// else set the flag so it doesn't happen again
if (started) {
return;
}
started = true;
// Get the collection of details elements, but if that's empty
// then we don't need to bother with the rest of the scripting
if ((list = document.getElementsByTagName('details')).length === 0) {
return;
}
// else iterate through them to apply their initial state
var n = list.length, i = 0;
for (i; i < n; i++) {
var details = list[i];
// Save shortcuts to the inner summary and content elements
details.__summary = details.getElementsByTagName('summary').item(0);
details.__content = details.getElementsByTagName('div').item(0);
// If the content doesn't have an ID, assign it one now
// which we'll need for the summary's aria-controls assignment
if (!details.__content.id) {
details.__content.id = 'details-content-' + i;
}
// Add ARIA role="group" to details
details.setAttribute('role', 'group');
// Add role=button to summary
details.__summary.setAttribute('role', 'button');
// Add aria-controls
details.__summary.setAttribute('aria-controls', details.__content.id);
// Set tabIndex so the summary is keyboard accessible for non-native elements
// http://www.saliences.com/browserBugs/tabIndex.html
if (!NATIVE_DETAILS) {
details.__summary.tabIndex = 0;
}
// Detect initial open state
var openAttr = details.getAttribute('open') !== null;
if (openAttr === true) {
details.__summary.setAttribute('aria-expanded', 'true');
details.__content.setAttribute('aria-hidden', 'false');
} else {
details.__summary.setAttribute('aria-expanded', 'false');
details.__content.setAttribute('aria-hidden', 'true');
if (!NATIVE_DETAILS) {
details.__content.style.display = 'none';
}
}
// Create a circular reference from the summary back to its
// parent details element, for convenience in the click handler
details.__summary.__details = details;
// If this is not a native implementation, create an arrow
// inside the summary
var twisty = document.createElement('i');
if (openAttr === true) {
twisty.className = 'arrow arrow-open';
twisty.appendChild(document.createTextNode('\u25bc'));
} else {
twisty.className = 'arrow arrow-closed';
twisty.appendChild(document.createTextNode('\u25ba'));
}
details.__summary.__twisty = details.__summary.insertBefore(twisty, details.__summary.firstChild);
details.__summary.__twisty.setAttribute('aria-hidden', 'true');
}
// Define a statechange function that updates aria-expanded and style.display
// Also update the arrow position
function statechange(summary) {
var expanded = summary.__details.__summary.getAttribute('aria-expanded') === 'true';
var hidden = summary.__details.__content.getAttribute('aria-hidden') === 'true';
summary.__details.__summary.setAttribute('aria-expanded', (expanded ? 'false' : 'true'));
summary.__details.__content.setAttribute('aria-hidden', (hidden ? 'false' : 'true'));
if (!NATIVE_DETAILS) {
summary.__details.__content.style.display = (expanded ? 'none' : '');
var hasOpenAttr = summary.__details.getAttribute('open') !== null;
if (!hasOpenAttr) {
summary.__details.setAttribute('open', 'open');
} else {
summary.__details.removeAttribute('open');
}
}
if (summary.__twisty) {
summary.__twisty.firstChild.nodeValue = (expanded ? '\u25ba' : '\u25bc');
summary.__twisty.setAttribute('class', (expanded ? 'arrow arrow-closed' : 'arrow arrow-open'));
}
return true;
}
// Bind a click event to handle summary elements
addClickEvent(document, function(e, summary) {
if (!(summary = getAncestor(summary, 'summary'))) {
return true;
}
return statechange(summary);
});
}
// Bind two load events for modern and older browsers
// If the first one fires it will set a flag to block the second one
// but if it's not supported then the second one will fire
addEvent(document, 'DOMContentLoaded', addDetailsPolyfill);
addEvent(window, 'load', addDetailsPolyfill);
})();