How to access ImageButton control from another class?

Question

JS Code:

<script type="text/javascript">
         function ShowCurrentTime(name) {
         PageMethods.GetCurrentTime(name, OnSuccess);
         }
         function OnSuccess(response, userContext, methodName) {
          alert(response);
         }
</script>

HTML Code:

<asp:ImageButton ID="IMGBTN001" runat="server" ImageUrl="Images/ico/labaniat.png"
class="img-responsive em-img-lazy" OnClientClick="ShowCurrentTime('01')" />

<asp:Image class="img-responsive retina-img em-img-lazy" ID="IMGMostViewed" runat="server"ImageUrl="Images/Banner/block1_banner.jpg" />

Code Behind C#

[System.Web.Services.WebMethod]
public static string GetCurrentTime(string name)
{
    //string x = IMGMostViewed.ImageUrl;
    return "Hello " + name + Environment.NewLine + "The Current Time is: "
            + DateTime.Now.ToString();
}

I want to access the Image from another class.

How can I access the IMGMostViewed this GetCurrentTime class?

i used this code, but get "page.FindControl("IMGMostViewed")" return null

    [System.Web.Services.WebMethod]
public static string GetCurrentTime(string name)
{
    if (HttpContext.Current != null)
    {
        Page page = (Page)HttpContext.Current.Handler;
        Image IMGMostViewed = (Image)page.FindControl("IMGMostViewed");
        string x = IMGMostViewed.ImageUrl;
    }
    return "Hello " + name + Environment.NewLine + "The Current Time is: "
            + DateTime.Now.ToString();
}

score 0 · Answer 1 · edited May 23 '17 at 11:58

0

Theoreticaly you can cast the CurrentHandler to your type of page and then access your button:

var currentHandler = HttpContext.Current.CurrentHandler as T;
currentHandler.IMGBTN001.ImageUrl = "abc";

The beter way would be to access your button on clientside in your success function.

     function ShowCurrentTime(name) {
      PageMethods.GetCurrentTime(name, OnSuccess);
     }
     function OnSuccess(response, userContext, methodName) {
      //Access here your button and modify it
     }

Here you also will find a related Answer: How to access page controls inside a static web method?

edited May 23 '17 at 11:58

Community

1
1

answered Jul 04 '16 at 05:47

Cyril Iselin

596
4
20

Thanks for your answer. What is ' T ' in HttpContext.Current.CurrentHandler as T;? – mohammad Jul 04 '16 at 05:51
T should represent your page, then you have an instance of your page and you are able to access your imagebutton :) – Cyril Iselin Jul 04 '16 at 05:56
I use this but get null reference – mohammad Jul 04 '16 at 06:14
I added a link, have a look at this, if it won't help post your code again (page markup; page codebehind, page webmethod javascript) – Cyril Iselin Jul 04 '16 at 06:17
@Cyril Iselin HttpContext.Current.CurrentHandler return null reference ? – Chiako Jul 05 '16 at 05:34

How to access ImageButton control from another class?

1 Answers1