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Asp.Net Image Gallery with Enlarge Image Preview in DataList using C# and VB.Net

Jun 27, 2016
Introduction:

Here I will explain how to show enlarge image preview when mouseover on images in image gallery using JQuery in asp.net  or zoom / enlarge images in datalist on mouseover using JQuery in asp.net or how to show enlarge image when mouse over on image using JQuery in asp.net.

Description:

In previous article I explained jQuery modal popup image slideshow in asp.net, jQuery simple image slideshow with text overlay example, jQuery zoom image on mouseover using zoom image pluginGenerate thumbnail from images in asp.net, Generate thumbnails from YouTube videos using JQuery and many articles relating to JQuery, asp.net, SQL Server etc. Now I will explain how to show large image preview when mouse hover on images in datalist using JQuery in asp.net.

To implement this concept first create new web application >> Right click on your application >> Select Add New Folder and Give name as Images >> Once folder created place some images in folder to show preview of images when hover on link using JQuery in asp.net.

After completion of folder creation and insertion of images in folder write the following code in your aspx page


<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Show Image Preview when hover on Link using jQuery</title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js">
</script>
<script type="text/javascript" language="javascript">
$(document).ready(function() {
ShowImagePreview();
});
// Configuration of the x and y offsets
function ShowImagePreview() {
xOffset = -20;
yOffset = 40;

$("a.preview").hover(function(e) {
this.t = this.title;
this.title = "";
var c = (this.t != "") ? "<br/>" + this.t : "";
$("body").append("<p id='preview'><img src='" + this.href + "' alt='Image preview' />" + c + "</p>");
$("#preview")
.css("top", (e.pageY - xOffset) + "px")
.css("left", (e.pageX + yOffset) + "px")
.fadeIn("slow");
},

function() {
this.title = this.t;
$("#preview").remove();
});

$("a.preview").mousemove(function(e) {
$("#preview")
.css("top", (e.pageY - xOffset) + "px")
.css("left", (e.pageX + yOffset) + "px");
});
};

</script>
<style type="text/css">
#preview{
position:absolute;
border:3px solid #ccc;
background:#333;
padding:5px;
display:none;
color:#fff;
box-shadow: 4px 4px 3px rgba(103, 115, 130, 1);
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:DataList ID="dtlist" runat="server" RepeatColumns="4" CellPadding="5">
<ItemTemplate>
<asp:HyperLink ID="HyperLink1" class="preview" ToolTip='<%#Bind("Name") %>' NavigateUrl='<%# Bind("Name", "~/Images/{0}") %>' runat="server">
<asp:Image Width="100" ID="Image1" ImageUrl='<%# Bind("Name", "~/Images/{0}") %>' runat="server" />
</asp:HyperLink>
</ItemTemplate>
<ItemStyle BorderColor="Brown" BorderStyle="dotted" BorderWidth="3px" HorizontalAlign="Center"
VerticalAlign="Bottom" />
</asp:DataList>
</div>
</form>
</body>
</html>
Now add the following namespaces in code behind

C# Code

using System;
using System.Collections;
using System.IO;
After add namespaces write the following code in code behind

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindDataList();
}
}
protected void BindDataList()
{
DirectoryInfo dir = new DirectoryInfo(MapPath("Images"));
FileInfo[] files = dir.GetFiles();
ArrayList listItems = new ArrayList();
foreach (FileInfo info in files)
{
listItems.Add(info);
}
dtlist.DataSource = listItems;
dtlist.DataBind();
}
VB.NET Code


Imports System.Collections
Imports System.IO
Partial Class VBCodeSamples
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load

If Not IsPostBack Then
BindDataList()
End If
End Sub
Protected Sub BindDataList()
Dim dir As New DirectoryInfo(MapPath("Images"))
Dim files As FileInfo() = dir.GetFiles()
Dim listItems As New ArrayList()
For Each info As FileInfo In files
listItems.Add(info)
Next
dtlist.DataSource = listItems
dtlist.DataBind()
End Sub
Demo 

Download sample code attached

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