Few of us use Microsoft Sharepoint. We won't be able to run your
example, nor will we be able to easily look at the code and know what it
does.
It's better to post a link to your site, so that other can at
least use the desktop browser's inspection/debug tools.
For problems that can be isolated, it's best to make an
example using jsFiddle or Plunkr and then others can easily make
changes for you to try. I'm afraid that would be difficult in
this case, though.
I'm not sure what - if any - jQuery plugin(s) you are using?
GridView is a Microsoft ASP thing. You'll get better help from a
Microsoft ASP help site.
2.
For popup link,I was thinking about using a link to a hidden
textbox (for remark) and onmouse click, system will be
displayed the textbox which consist of a few information from
database and text area for remarking. I, thinking of simplest
code for this. Can anyone advise me on
this?
Not sure what your question
here is.
Popovers don't seem to me to be very well-suited for
collecting input. I would use a modal:
Though, personally, I prefer just using a collapse.
Popups/popovers/modals, can have messy complications (like what to do
when they don't fit) on mobile touch-screens.