技术资料 > .Net专区 > Asp.Net开发 : 通过自定义类来达到向aspx页面加入脚本代码的例子

通过自定义类来达到向aspx页面加入脚本代码的例子

March 25,2004

Set the InitialFocus for an ASP.NET WebForm
The PageUtil class has a static method SetInitialFocus(control) which can be used to generate a JavaScript for an ASP.NET page (WebForm), which sets the focus on a (given) control.

      private void Page_Load(object sender, System.EventArgs e)
      {
         // Set the InitialFocus on TextBox1
         PageUtil.SetInitialFocus(TextBox1);

using System;
using System.Web.UI;

namespace InitialFocusDemo
{
/// <summary>
/// Utility class for a ASP.NET page
/// </summary>
public class PageUtil
{

      /// <summary>
      /// Set the IntialFocus to the given control. Only works when JavaScript is supported.
      /// </summary>
      /// <param name="control">Control to set the InitialFocus on.</param>
      public static void SetInitialFocus(Control control) {
         if (control.Page == null) {
            throw new ArgumentException("The Control must be added to a Page before you can set the IntialFocus to it.");
         }
         if (control.Page.Request.Browser.JavaScript == true) {
            control.Page.RegisterClientScriptBlock("InitialFocus",
            "<SCRIPT FOR='window' EVENT='onload' LANGUAGE='JScript'>document.all."
            + control.UniqueID + ".focus();</SCRIPT>");
         }
      }

}
}