Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/7399#issuecomment-121650945
Here is the rule for page navigation.
* If the totalPages is 1, the page navigation will be empty
* If the totalPages is more than 1, it will create a page navigation
including a group of page numbers (10 pages) and a form to submit the page
number.
Here are some examples of the page navigation:
```
<< < 11 12 13* 14 15 16 17 18 19 20 > >>
This is the first group, so "<<" is hidden.
< 1 2* 3 4 5 6 7 8 9 10 > >>
This is the first group and the first page, so "<<" and "<" are hidden.
1 2* 3 4 5 6 7 8 9 10 > >>
Assume totalPages is 19. This is the last group, so ">>" is hidden.
<< < 11 12 13* 14 15 16 17 18 19 >
Assume totalPages is 19. This is the last group and the last page, so ">>"
and ">" are hidden.
<< < 11 12 13 14 15 16 17 18 19*
* means the current page number
<< means jumping to the first page of the previous group.
< means jumping to the previous page.
>> means jumping to the first page of the next group.
> means jumping to the next page.
```
And a screenshot for 100k tasks:
<img width="1356" alt="pagination-100k"
src="https://cloud.githubusercontent.com/assets/1000778/8702111/545e57aa-2b48-11e5-82c0-e488617d31a2.png";>
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