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Prevent errors when up/down arrows are pressed in an empty notebook.

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Notebook.get_selected_cell() returns `null` in an empty notebook.
This commit is contained in:
David Wyde 2013-04-02 17:44:27 -05:00
parent a8873230bf
commit 904be21a9f
1 changed files with 2 additions and 2 deletions
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4
IPython/frontend/html/notebook/static/js/notebook.js
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@ -137,13 +137,13 @@ var IPython = (function (IPython) {
}
if (event.which === key.UPARROW && !event.shiftKey) {
var cell = that.get_selected_cell();
if (cell.at_top()) {
if (cell && cell.at_top()) {
event.preventDefault();
that.select_prev();
};
} else if (event.which === key.DOWNARROW && !event.shiftKey) {
var cell = that.get_selected_cell();
if (cell.at_bottom()) {
if (cell && cell.at_bottom()) {
event.preventDefault();
that.select_next();
};