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Scroll on new message only if we were already at bottom

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FREEBIE
This commit is contained in:
Scott Nonnenberg 2017-05-17 14:34:02 -07:00
parent fed26c36ca
commit bfdb8254a4
1 changed files with 7 additions and 8 deletions
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15
js/views/message_list_view.js
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@ -40,7 +40,10 @@
this.$el.scrollTop(scrollPosition - this.$el.outerHeight());
},
scrollToBottomIfNeeded: function() {
this.$el.scrollTop(this.el.scrollHeight - this.bottomOffset);
if (this.bottomOffset === 0) {
this.$el.scrollTop(this.el.scrollHeight);
this.measureScrollPosition();
}
},
addOne: function(model) {
var view;
@ -53,21 +56,17 @@
this.listenTo(view, 'beforeChangeHeight', this.measureScrollPosition);
this.listenTo(view, 'afterChangeHeight', this.scrollToBottomIfNeeded);
}
var index = this.collection.indexOf(model);
this.measureScrollPosition();
if (index === this.collection.length - 1) {
// add to the bottom.
this.$el.append(view.el);
this.$el.scrollTop(this.el.scrollHeight); // TODO: Avoid scrolling if user has manually scrolled up?
this.measureScrollPosition();
} else if (index === 0) {
// add to top
this.measureScrollPosition();
this.$el.prepend(view.el);
this.scrollToBottomIfNeeded();
} else {
// insert
this.measureScrollPosition();
var next = this.$('#' + this.collection.at(index + 1).id);
var prev = this.$('#' + this.collection.at(index - 1).id);
if (next.length > 0) {
@ -90,8 +89,8 @@
this.$el.append(view.el);
}
}
this.scrollToBottomIfNeeded();
}
this.scrollToBottomIfNeeded();
},
});
})();