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feat: auto collapsed menu

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This commit is contained in:
jeffreytse 2020-08-31 17:21:45 +08:00
parent 690e71acfc
commit 9b5b05463d
1 changed files with 45 additions and 2 deletions
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45
_includes/sidebar/article-menu.html
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@ -36,10 +36,49 @@
// The header element
var header = document.querySelector('header.site-header');
function doMenuCollapse(index) {
var items = menuContent.firstChild.children;
var activeItem = items[index];
var beginItem = activeItem
var endItem = activeItem
var beginIndex = index;
var endIndex = index + 1;
while (beginIndex >= 0
&& !items[beginIndex].classList.contains('h-h2')) {
beginIndex -= 1;
}
while (endIndex < items.length
&& !items[endIndex].classList.contains('h-h2')) {
endIndex += 1;
}
for (var i = 0; i < beginIndex; i++) {
item = items[i]
if (!item.classList.contains('h-h2')) {
item.style.display = 'none';
}
}
for (var i = beginIndex + 1; i < endIndex; i++) {
item = items[i]
// if (!item.classList.contains('h-h2')) {
item.style.display = '';
// }
}
for (var i = endIndex; i < items.length; i++) {
item = items[i]
if (!item.classList.contains('h-h2')) {
item.style.display = 'none';
}
}
}
// Init menu collapsed
doMenuCollapse(-1);
// Active the menu item
window.addEventListener('scroll', function (event) {
var lastActive = menuContent.querySelector('.active');
var changed = true;
var activeIndex = -1;
for (var i = headings.length - 1; i >= 0; i--) {
var h = headings[i];
var headingRect = h.getBoundingClientRect();
@ -53,6 +92,7 @@
var curActive = a.parentNode;
if (curActive) {
curActive.classList.add('active');
activeIndex = i;
}
if (lastActive == curActive) {
changed = false;
@ -60,9 +100,12 @@
break;
}
}
if (lastActive && changed) {
if (changed) {
if (lastActive) {
lastActive.classList.remove('active');
}
doMenuCollapse(activeIndex);
}
event.preventDefault();
});
}