To get GridView page size in jQuery you can do following.
Step 1: In the server side, declare a page level public variable like
public string _pageSize = string.Empty;
Step 2: Set its value in the method like this
_pageSize = GridView1.PageSize.ToString();
Step 3: In .aspx or view page write following
var pageSize = '<%= _pageSize %>';
Hope this helps.
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