Load data on page scroll using jquery

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In this video we will discuss, how to load more data on page scroll using jQuery AJAX.

This is similar to Facebook. As you scroll down on the page more data will be loaded.

When the page is initially loaded we want to retrieve and display the first 50 rows from the database table tblEmployee. As we scroll down and when we hit the bottom of the page we want to load the next set of 50 rows.

Stored procedure

Create procedure spGetEmployees
@PageNumber int,
@PageSize int
as
Begin

Declare @StartRow int
Declare @EndRow int

Set @StartRow = ((@PageNumber - 1) * @PageSize) + 1
Set @EndRow = @PageNumber * @PageSize;


WITH RESULT AS
(
SELECT Id, Name, Gender, Salary,
ROW_NUMBER() OVER (ORDER BY ID ASC) AS ROWNUMBER
From tblEmployee
)
SELECT *
FROM RESULT
WHERE ROWNUMBER BETWEEN @StartRow AND @EndRow
End

HTML page

﹤!DOCTYPE html﹥
﹤html﹥
﹤head﹥
﹤script src="jquery-1.11.2.js"﹥﹤/script﹥
﹤script type="text/javascript"﹥
$(document).ready(function () {
var currentPage = 1;
loadPageData(currentPage);
$(window).scroll(function () {
if ($(window).scrollTop() == $(document).height() - $(window).height()) {
currentPage += 1;
loadPageData(currentPage);
}
});

function loadPageData(currentPageNumber) {
$.ajax({
url: 'EmployeeService.asmx/GetEmployees',
method: 'post',
dataType: "json",
data: { pageNumber: currentPageNumber, pageSize: 50 },
success: function (data) {
var employeeTable = $('#tblEmployee tbody');

$(data).each(function (index, emp) {
employeeTable.append('﹤tr﹥﹤td﹥' + emp.ID + '﹤/td﹥﹤td﹥'
+ emp.Name + '﹤/td﹥﹤td﹥' + emp.Gender
+ '﹤/td﹥﹤td﹥' + emp.Salary + '﹤/td﹥﹤/tr﹥');
});
},
error: function (err) {
alert(err);
}
});
}
});
﹤/script﹥
﹤/head﹥
﹤body style="font-family:Arial"﹥
﹤h1﹥The data will be loaded on demand as you scroll down the page﹤/h1﹥
﹤table id="tblEmployee" border="1" style="border-collapse:collapse; font-size:xx-large"﹥
﹤thead﹥
﹤tr﹥
﹤th﹥ID﹤/th﹥
﹤th﹥Name﹤/th﹥
﹤th﹥Gender﹤/th﹥
﹤th﹥Salary﹤/th﹥
﹤/tr﹥
﹤/thead﹥
﹤tbody﹥﹤/tbody﹥
﹤/table﹥
﹤/body﹥
﹤/html﹥