CODEWITHSUNDEEP
javascriptipythonjupyterjupyter-notebook
IanS
IanS

Reputation: 16251

How to select current cell with JavaScript in Jupyter?

I have a notebook cell containing JavaScript code, and I would like the code to select this particular cell. Unfortunately, the behavior of get_selected_cell depends on whether I execute the cell in place, or execute and select the cell below.

Example:

%%javascript
var cell = Jupyter.notebook.get_selected_cell();
console.log(Jupyter.notebook.find_cell_index(cell));

When executing this cell, the console output will be different whether I execute with Ctrl+Enter or Shift+Enter. In one case it logs the index of the cell that contains the JavaScript code, in the other the index of the cell below.

Is there a way to select the cell I want?

Upvotes: 7

Views: 5214

Answers (3)

Jay Wang
Jay Wang

Reputation: 2840

If you are writing a jupyter lab widget, you can get the cell index by iterating the widget array. This is what jupyter lab internally does (source).

const cellIndex = ArrayExt.findFirstIndex(
  notebook.content.widgets,
  widget => widget.node === this.originalCell.node
);

Then you can assign the new active cell by changing the activeCellIndex property of the notebook widget:

notebook.content.activeCellIndex = cellIndex;

Upvotes: 1

Donghyun Kwak
Donghyun Kwak

Reputation: 31

In the case of executing javascript with display(HTML("javascript code")), this will return the Window object.

So you should use display(Javascript("javascript code")) to get the current cells' output_area.

Upvotes: 2

minrk
minrk

Reputation: 38608

Your Javascript will have a handle on the OutputArea applying the Javascript, but not one all the way to the cell (in general, output areas can be used without cells or notebooks). You can find the cell by identifying the parent .cell element, and then getting the cell corresponding to that element:

%%javascript
var output_area = this;
// find my cell element
var cell_element = output_area.element.parents('.cell');
// which cell is it?
var cell_idx = Jupyter.notebook.get_cell_elements().index(cell_element);
// get the cell object
var cell = Jupyter.notebook.get_cell(cell_idx);

Upvotes: 7

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