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In pagination ( I am taking the example of the log manager that I observed), when I clicked on the logs of a server then a popup came and below it showed there are 4 pages. I tried changing the pages in different manners such as changing to the previous,next,first and last pages by clicking the icons. They workedd well. But when I wrote 23 in the bar it showed no logs found. When I clicked on the previous button, then it kept on decrementing (22,21,20......). I think in such cases it should move to the previous valid page. And when I gave 55 then it showed first page. I am not sure at what minimum number this thing happens. But happens for all the greater numbers.
Same case with negative numbers also. If we give negative numbers it should give notification to user as "invalid page number". Rather it will just display the current page. And the previous and first page links are disabled. If we click the next button then the page numbers just keep on incrementing. (Ex: if we give -34 and keep on clicking next button then it keeps on ncrementing the value -33,-32......).