sheetjs-clone/docbits/66_comments.md

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#### Cell Comments
Cell comments are objects stored in the `c` array of cell objects. The actual
contents of the comment are split into blocks based on the comment author. The
`a` field of each comment object is the author of the comment and the `t` field
2017-09-24 23:40:09 +00:00
is the plain text representation.
For example, the following snippet appends a cell comment into cell `A1`:
```js
if(!ws.A1.c) ws.A1.c = [];
ws.A1.c.push({a:"SheetJS", t:"I'm a little comment, short and stout!"});
```
Note: XLSB enforces a 54 character limit on the Author name. Names longer than
54 characters may cause issues with other formats.
To mark a comment as normally hidden, set the `hidden` property:
```js
if(!ws.A1.c) ws.A1.c = [];
ws.A1.c.push({a:"SheetJS", t:"This comment is visible"});
if(!ws.A2.c) ws.A2.c = [];
ws.A2.c.hidden = true;
ws.A2.c.push({a:"SheetJS", t:"This comment will be hidden"});
```
_Threaded Comments_
Introduced in Excel 365, threaded comments are plain text comment snippets with
author metadata and parent references. They are supported in XLSX and XLSB.
To mark a comment as threaded, each comment part must have a true `T` property:
```js
if(!ws.A1.c) ws.A1.c = [];
ws.A1.c.push({a:"SheetJS", t:"This is not threaded"});
if(!ws.A2.c) ws.A2.c = [];
ws.A2.c.hidden = true;
ws.A2.c.push({a:"SheetJS", t:"This is threaded", T: true});
ws.A2.c.push({a:"JSSheet", t:"This is also threaded", T: true});
```
There is no Active Directory or Office 365 metadata associated with authors in a thread.