I am encountering an issue with my Web-Application when trying to perform partial updates. The error message "Sys.WebForms is undefined in Chrome (latest version)" keeps popping up. Despite my extensive research efforts, I have not been able to find a solution.
I would greatly appreciate your assistance as I am still learning about ASP.Net and AJAX.
This is the snippet of code that is causing the problem:
var prm = Sys.WebForms.PageRequestManager.getInstance();
The main issue lies in the fact that the iPad full-screen application provides a user-agent header that ASP.Net fails to identify, leading it to believe that the browser lacks ajax support. Consequently, the ScriptManager neglects to include "MicrosoftAjaxWebForms.js" and other necessary elements for ajax panels to function properly.
To address this issue, consider implementing the following workaround in your base page:
protected void Page_PreInit(object sender, EventArgs e)
{
if (Request.UserAgent != null && Request.UserAgent.IndexOf("AppleWebKit", StringComparison.CurrentCultureIgnoreCase) > -1)
{
this.ClientTarget = "uplevel";
}
}
For additional information, refer to:
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