防止頁面重複提交

#region 是否防止使用者多次提交頁面
        /// <summary>
        /// 是否防止使用者多次提交頁面。預設為true。
        /// 如果為true，則使用者在提交頁面時，會出現提示，防止使用者在伺服器響應之前再次提交。
        /// </summary>
        public bool OneClick
        {
            get
            {
                string key = this.ClientID + "_OneClick";
                if (ViewState[key] == null)
                {
                    ViewState[key] = true;
                }
                return (bool)ViewState[key];
            }
            set
            {
                string key = this.ClientID + "_OneClick";
                ViewState[key] = value;
            }
        }
        /// <summary>
        /// 表單提交時的提示
        /// </summary>
        protected string mOnSubmitTip = string.Empty;
        protected string OnSubmitTip
        {
            set
            {
                mOnSubmitTip = value;
            }
            get
            {
                if (mOnSubmitTip == "")
                {
                    if (this.CurCulture == 2052)
                    {
                        mOnSubmitTip = "正在處理表單，請稍候....";
                    }
                    else
                    {
                        mOnSubmitTip = "form process, please waiting....";
                    }
                }
                return mOnSubmitTip;
            }
        }
        /// <summary>
        /// 重建html的頭和尾
        /// </summary>
        private void RebuildHtml()
        {
            #region 增加在表單提交時，防止使用者重複提交的措施

            int curCtrl;
            int count;
            HtmlForm form = null;

            // 在form上添加提交事件
            for (curCtrl = 0, count = this.Controls.Count; curCtrl < count; curCtrl++)
            {
                form = this.Controls[curCtrl] as HtmlForm;

                // 不為NULL
                if (form != null)
                {
                    break;
                }
            }

            // RETURN
            if (curCtrl == count)
            {
                return;
            }

            form.Attributes["onsubmit"] = "try{submitForm(this);}catch(e){}";

            // onclick
            if (this.OneClick)
            {
                // 增加顯示提示資訊的表格
                StringBuilder sb = new StringBuilder();
                sb.Append("<table id=\"show_panel_on_submit\" ");
                sb.Append("style=\"position:absolute;display:none;\" ");
                sb.Append("border=0 height=100% width=100%>");
                sb.Append("\n  <tr>");
                sb.Append("\n    <td align=center>");
                sb.Append(OnSubmitTip);
                sb.Append("\n    </td>");
                sb.Append("\n  </tr>");
                sb.Append("</table>");
                ((LiteralControl)Controls[0]).Text += sb.ToString();

                // 增加在表單提交時，隱藏表單並顯示提示表格的指令碼
                // 注意：是否進行指令碼事件，由頁面驗證控制項內容是否為空白決定
                sb = new StringBuilder();
                sb.Append("\n<script>");
                sb.Append("\nfunction submitForm(form) {");
                sb.Append("\n  if(document.all.validation_summary_on_form_submit.innerHTML == '') {");
                sb.Append("\n    form.style.display='none';");
                sb.Append("\n    document.all.show_panel_on_submit.style.display='';");
                sb.Append("\n  }");
                sb.Append("\n}");
                sb.Append("\n</script>");
                ((LiteralControl)Controls[2]).Text += sb.ToString();

                // 增加頁面驗證控制項，
                // 表單提交時，可通過檢驗該控制項innerHTML來判斷提交是否合法
                ValidationSummary vs = new ValidationSummary();
                vs.ID = "validation_summary_on_form_submit";
                vs.Attributes["style"] = "position:absolute;top:-1000;left:-1000";
                form.Controls.Add(vs);
            }
            #endregion
        }
        // 修改記錄2 2010-09-14 朱潔 添加 RebuildHtml()，是否防止使用者多次提交頁面 結束

        #endregion