I want to make the web part for image sliding for Picture Library.

I got this link for doing so.

My code for visual web part is :

<!DOCTYPE html>

    <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
    <title>Slide Show</title>
    <style type="text/css">
        .size {
            height: 300px;
            width: 500px;
            position: relative;

        .lab {
            background-color: rgba(0, 0, 0, 0.5);
            color: #FF0000;
            height: 80px;
            line-height: 20px;
            margin-top: 200px;
            padding: 10px;
            position: absolute;
            width: 480px;
            z-index: 100;


    <div id="main" runat="server">

        <div id="slideShowImages" runat="server">


    <script src="../_layouts/15/JSLink/slideShow.js"></script>


And background C# code is:

    protected void Page_Load(object sender, EventArgs e)
        string HtmlCode = "";

        SPSite site = SPContext.Current.Site;

        SPWeb web = site.RootWeb;

        SPList list = web.Lists.TryGetList("Pics");

        foreach (SPListItem item in list.Items)
            HtmlCode += "<img src=" + Convert.ToString(item[SPBuiltInFieldId.EncodedAbsUrl]) + " alt='Image' class='size'/>";                

        main.InnerHtml = "<Label>Hello</Label>";
        slideShowImages.InnerHtml = HtmlCode;

The images are stored in picture library and the lable text will be fixed which is going to be float over the image.

I tried the code shown in msdn example working perfectly but when I apply this in Visual Web Part I am not able to do it as the ID of DIVs are changed when they are runat server.

What should I do to get the html output in my web part?

  • Remove .. from <script src="../_layouts/15/JSLink/slideShow.js"></script>
    – user2536
    Nov 12, 2013 at 8:01
  • The js is loaded successfully but the problem resides in the DIV id conflicts, i.e. in js the DIV id which has value slideShowImages are slide but when I apply the runat property the child DIV is not created (Here, <div id="slideShowImages" runat="server"> in my case)
    – users1100
    Nov 12, 2013 at 8:09
  • And also the ID of main DIV is also changed to ctl00_ctl33_g_ee3e11ee_5274_4fcc_9b8d_c8eb66e2e682_main
    – users1100
    Nov 12, 2013 at 8:12

1 Answer 1


When you add runat="server" to a div tag it gets an auto generated id.

So when you in javascript or jQuery wants to get an element by ID and that element has the runat="server" attribute, then you need to use inline code to get it.

Example without runat="server" attribute

<div id="MyDIV">some content </div>

var mydiv = $("#MyDIV");

Example with runat="server" attribute

<div id="MyDIV" runat="server">some content </div>

var mydiv = $("#<%= MyDIV.CliendID%>");

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