asp.net中的警报框

Question

我尝试在互联网上搜索在asp.net中显示javascript警告框的方法，但没有一个工作。 我的代码：

string message;
System.Text.StringBuilder sb = new System.Text.StringBuilder();
   if ((int) Application["taken"] == 1)
   {
       message = "Username and email already in use!";
       ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertMessage", "alert('Username and email already in use!')", true);
   }
   else if ((int) Application["taken"] == 2)
   {
       message = "Username already in use!";
       ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertMessage", "alert('Username already in use!')", true);
   }
   else if ((int) Application["taken"] == 3)
   {
       message = "Email already in use!";
       sb.Append("<script type = 'text/javascript'> window.onload=function(){alert('" + message + "')} </script>");
       ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", sb.ToString());
   }

我需要做什么？

Answer 1

你能试试RegisterStartupScript吗？

ClientScript.RegisterStartupScript(this.GetType(), "alertMessage", "alert('Username already in use!')", true);

Answer 2

您不能两次调用脚本，而是在同一脚本中两次编写警报代码。 您可以在aspx页面上编写javascript方法，也可以在javascript文件中编写并包含它。然后在cs页面注册为

ScriptManager.RegisterStartupScript(this, this.GetType(), “ShowStatus”, “javascript:ShowMessages(‘First Message’,’Second Message’);”, true);

function ShowMessages(msg1, msg2) {
 alert(msg1);
 alert(msg2);
}

详情请点击link