javascript - 如何在 asp.net c# 中执行下一行之前显示警报弹出窗口

Question

我想在我的网络应用程序中显示警报/消息。我尝试了以下代码，但在执行所有代码行后显示警报。

ScriptManager.RegisterStartupScript(this, GetType(), "showalert", "alert('Only alert Message');", true); 

但是我想在代码执行行的中间显示我，是否可以，如果可能的话请帮助我..

Answer 1

正如我已经评论过的:

You cannot. RegisterStartupScript as you can read will register a startup script not call it. Also this script will be called only when response is received by client and processed. You can try a workaround for your scenario. Create a hidden button, and define a function to be processed after alert to this button. Then in your script, show alert and call click of this button.

您的函数可能如下所示:

public string myFunction(){
  int a = 123;
  .
  .
  .

  ScriptManager.RegisterStartupScript(this, GetType(), "showalert", "alert('Only alert Message');", true); 

  .
  .
  .
  .
  .
  return str;

}

你必须把这个函数分成两部分:

public string myFunction1(){
  int a = 123;
  .
  .
  .

  ScriptManager.RegisterStartupScript(this, GetType(), "showalert", "alert('Only alert Message');", true); 

  return str;
}

public string myFunction2(){
  .
  .
  .
  .
  .

}

并将myFunction1关联到原始事件，将myFunction2关联到隐藏按钮。然后将您的脚本更新为:

ScriptManager.RegisterStartupScript(this, GetType(), "showalert", "alert('Only alert Message'); document.getElementById('<% hiddenBtn.clientId %>').click()", true); 

这将调用剩余的代码和流程逻辑。

注意 这是一个解决方法。理想情况下，您应该尝试拆分功能并尝试使用后台处理。