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Fix jumpy downward post loading

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This commit is contained in:
Toby Zerner 2015-02-08 15:58:53 +10:30
parent dc6a8bf08b
commit 6c3debc79b
1 changed files with 25 additions and 23 deletions
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48
ember/app/components/discussions/stream-item.js
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@ -77,32 +77,34 @@ export default Ember.Component.extend({
return false;
}
// If new posts are being loaded in an upwards direction, then when they
// are rendered, the rest of the posts will be pushed down the page.
// However, we want to maintain the current scroll position relative to
// the content after the gap. To do this, we need to find item directly
// after the gap and use it as an anchor.
if (this.get('direction') === 'up') {
var anchor = this.$().nextAll('.item:first');
// If new posts are being loaded in an upwards direction, then when
// they are rendered, the rest of the posts will be pushed down the
// page. If loaded in a downwards direction from the end of a
// discussion, the terminal gap will disappear and the page will
// scroll up a bit before the new posts are rendered. In order to
// maintain the current scroll position relative to the content
// before/after the gap, we need to find item directly after the gap
// and use it as an anchor.
var siblingFunc = this.get('direction') === 'up' ? 'nextAll' : 'prevAll';
var anchor = this.$()[siblingFunc]('.item:first');
// Immediately after the posts have been loaded (but before they
// have been rendered,) we want to grab the distance from the top of
// the viewport to the top of the anchor element.
this.get('stream').one('postsLoaded', function() {
if (anchor.length) {
var scrollOffset = anchor.offset().top - $(document).scrollTop();
}
// Immediately after the posts have been loaded (but before they
// have been rendered,) we want to grab the distance from the top of
// the viewport to the top of the anchor element.
this.get('stream').one('postsLoaded', function() {
if (anchor.length) {
var scrollOffset = anchor.offset().top - $(document).scrollTop();
}
// After they have been rendered, we scroll back to a position
// so that the distance from the top of the viewport to the top
// of the anchor element is the same as before. If there is no
// anchor (i.e. this gap is terminal,) then we'll scroll to the
// bottom of the document.
Ember.run.scheduleOnce('afterRender', function() {
$('body').scrollTop(anchor.length ? anchor.offset().top - scrollOffset : $('body').height());
});
// After they have been rendered, we scroll back to a position
// so that the distance from the top of the viewport to the top
// of the anchor element is the same as before. If there is no
// anchor (i.e. this gap is terminal,) then we'll scroll to the
// bottom of the document.
Ember.run.scheduleOnce('afterRender', function() {
$('body').scrollTop(anchor.length ? anchor.offset().top - scrollOffset : $('body').height());
});
}
});
// Tell the controller that we want to load the range of posts that this
// gap represents. We also specify which direction we want to load the