Asp.net Button PostBack use OnClientClick

Last Update: 2011/06/22 16:08+08
更新~ 加入ValidationGroup

Intro

目標是
1. Confirm before PostBack
2. Validator working

Context

這大概沒啥技術性, 就是要找怎麼用
重點在
GetPostBackEventReference: 取得PostBack函式
Page_ClientValidate(string ValidationGroup): 執行頁面驗證, 會回傳成功與否
Page_IsValid: 驗證狀態 (這大概是個Flag可以不用)

根據這些去拼出 JavaScript
最後的 return false 是避免自動PostBack
不知道誰呼叫了 onclick, 如果沒回傳false仍舊會PostBack

public static void ClickSendValidConfirmDisabled(System.Web.UI.Page page, System.Web.UI.WebControls.WebControl ctrl, string confirmText){
 string clientScript = ctrl.ClientID + ".disabled='disabled';" + page.ClientScript.GetPostBackEventReference(ctrl, null) + ";";

 bool needValid = false;
 string validationGroup = null;
 if (ctrl is System.Web.UI.WebControls.IButtonControl){
  System.Web.UI.WebControls.IButtonControl ibtnCtrl = ctrl as System.Web.UI.WebControls.IButtonControl;
  needValid = ibtnCtrl.CausesValidation;
  validationGroup = ibtnCtrl.ValidationGroup;
 }

 clientScript = "if(confirm('" + confirmText + "')){" + clientScript + "}";

 if (needValid){ clientScript = "if(Page_ClientValidate('" + validationGroup + "')){" + clientScript + "}"; }

 ctrl.Attributes["onclick"] = clientScript + "return false;";
}