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Don't error out scrolling when there's nothing there

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(imported from commit e2af794dafb93e3509c6fa5f28314ac8e21849b0)
This commit is contained in:
Leo Franchi
2014-02-21 15:52:51 -05:00
committed by Jessica McKellar
parent 13045f953f
commit ffdfa203e8
1 changed files with 2 additions and 2 deletions
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4
static/js/rows.js
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@@ -6,7 +6,7 @@ var exports = {};
// that our next element is *not* a message_row, so this // that our next element is *not* a message_row, so this
// isn't going to end up empty unless we're at the bottom or top. // isn't going to end up empty unless we're at the bottom or top.
exports.next_visible = function (message_row) { exports.next_visible = function (message_row) {
if (message_row === undefined) { if (message_row === undefined || message_row.length === 0) {
return $(); return $();
} }
var row = message_row.next('.selectable_row'); var row = message_row.next('.selectable_row');
@@ -22,7 +22,7 @@ exports.next_visible = function (message_row) {
}; };
exports.prev_visible = function (message_row) { exports.prev_visible = function (message_row) {
if (message_row === undefined) { if (message_row === undefined || message_row.length === 0) {
return $(); return $();
} }
var row = message_row.prev('.selectable_row'); var row = message_row.prev('.selectable_row');