C＃中的JavaScript代码落后

Question

I have the following code in my cs file.

private bool ValidateFirst()
{
    StringBuilder sb2 = new StringBuilder();

    sb2.Append(@"<script language='javascript'> var bContinue = true;");
    sb2.Append(@"bContinue = confirm(");
    sb2.Append("'some text here'");
    sb2.Append(@");");

    sb2.Append("if (bContinue) {");
    sb2.Append(this.Page.ClientScript.GetPostBackEventReference(this, "OKFinal"));
    sb2.Append("}</script>");

    this.Page.ClientScript.RegisterStartupScript(this.Page.GetType(), "ConfirmDialog", sb2.ToString());

    return false;
}

So what I wanted here is to display a confirm pop up on the page. The sb2.ToString() is working when I tested it on JSFiddle http://jsfiddle.net/2rbcsvh6/ (_doPostBack event will not work) but on my application, it won't display. The code is inside the screen controller action command.

protected void screenController_ActionCommand(object sender, Web.Controls.CancelCommandEventArgs e)
{
    if (e.CommandName == ScreenController.OkCommand)
    {
        // this is the method that contains the script
        if (ValidateFirst)
        {
            this.Save();
        }
    }
}

Answer 1

The problem is by the time you embed the JS the page has already been loaded and rendered. You need to either run your code before the page has loaded ie Page_Load or alternatively wrap your JS in a function which you can then invoke from the client.