Page_Load问题

Question

I have this javascript modal which I want to use for error reporting. Everything works well only that the code gets executed before page load. So the result is that I have my javascript before the head tag which means nothing gets executed!

Any help?

public void showError(string error)
{
    string script = "<script type=\"text/javascript\">$.facebox.settings.opacity = 0.4;jQuery.facebox(\""+error+"\");</script>";        
    System.Web.HttpContext.Current.Response.Write(script);        
}

By the way, my ShowError method is within a class called ErrorDisplay This is how I call it:

string strErr = "error here";
            ErrorDisplay myError = new ErrorDisplay();
            myError.ShowError(strErr);

Answer 1

The basic problem is that you need to make your Javascript wait for the DOM to be ready before it executes.

The easiest way around this is to use the ClientScriptManager.RegisterStartupScript method to execute your code rather than add it to the page directly:

public void Page_Load(Object sender, EventArgs e)
{
    Type myType = this.GetType();
    string script = "<script>alert('Hello World! I am ready.');</script>";

    Page.ClientScript.RegisterStartupScript(myType, "StartupScript", script);
}

UPDATE

My example was based on the fact that your original question was specifically about Page_Load. The code only needs to be modified slightly to fit your example though:

public void ShowError(string error)
{
    StringBuilder sb = new StringBuilder();
    s.Append("<script type='text/javascript'>");
    s.Append("$.facebox.settings.opacity = 0.4;");
    s.AppendFormat("$.facebox('{0}');", error);
    s.Append("</script>");

    Type t = this.GetType();
    Page.ClientScript.RegisterStartupScript(t, "ErrorScript", sb.ToString());
}

Answer 2

Assuming your just looking to have the code in Page_Load called later try using the Page_PreRender method instead. You can find a list of events and the order they are called located here http://msdn.microsoft.com/en-us/library/aa479007.aspx

Answer 3

This is how I achieved it:

public void ShowError(Page CurrentPage,string error)
{
    StringBuilder sb = new StringBuilder();
    sb.Append("<script type='text/javascript'>");
    sb.Append("$.facebox.settings.opacity = 0.4;");
    sb.AppendFormat("jQuery.facebox('{0}');", error);
    sb.Append("</script>");

    Type t = this.GetType();

    CurrentPage.ClientScript.RegisterStartupScript(t, "ErrorScript", sb.ToString());
}

When I call it(this,"error string");

Thanks a lot guys!!