When Scroll Page: theme.js:4 Uncaught TypeError: Cannot read property 'split' of undefined

[aimer1124]

When i scroll my page in my Gitbook Content,the browser console is something wrong.Like this

theme.js:4 Uncaught TypeError: Cannot read property 'split' of undefined

And when i scroll, the wrong number increase fast.The background color is black

---

Gitbook and node Version

➜  jmeter-tutorial git:(master) ✗ gitbook --version
CLI version: 2.3.0
GitBook version: 3.2.0
➜  jmeter-tutorial git:(master) ✗ node -v
v4.4.3

My PC Version

ProductName:    Mac OS X
ProductVersion: 10.11.2
BuildVersion:   15C50
Chrome: 53.0.2785.116 (64-bit)

This is my gitbook homepage,but when i use Firefox browser,everything goes ok.

[maxkoryukov]

I have the very similar error:

theme.js:12924 Uncaught TypeError: Cannot read property 'top' of undefined

I have not-uglified line number (12924), just because I forced gitbook to use not-compressed default-theme (see also GitbookIO/theme-default#43)

So, in my case the errors was caused by the non-existent bookmark in the SUMMARY.md. Lets say:

• in SUMMARY.md I have a link like

  * [about section](page.md#about)

• but my page.md does not contain a chapter named about. Even if I have an explicit

  <a name="about"></a>

  this does not help - A-tag will not be recognized by name;

The error occurs in the GitbookIO/theme-default package , in the file /src/js/theme/navigation.js, line 63, function getElementTopPosition. In the following code:

dest = $el.position().top;

$el doesn't contain any tag, $el.position() returns undefined.

[maxkoryukov]

Actually, this issue should be moved to the default-theme repo

[SamyPesse]

This issue can stay in this repository, since we moved to one repository for all packages now.

I'll close this issue once v4 is released as stable.

[maxkoryukov]

Fixed in GitbookIO/theme-default@fd742a1

[maxkoryukov]

ping @SamyPesse @AaronO to close this issue - it is closed, I've attached a link to a commit with a patch

[morsko1]

hi @maxkoryukov,
you commented that this issue fixed by GitbookIO/theme-default@fd742a1

but in my case it didn`t solve issue of console errors when scrolling page:

if i use your fix of closed PR - there are no errors in console.

so can you confirm that GitbookIO/theme-default@fd742a1 fixed the console errors when scrolling?

and if it was not fixed by GitbookIO/theme-default@fd742a1 - could you reopen your closed PR please?

thanks