[ASP.NET]透過Javascript控制欄位的必填驗証

2012-04-09

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ASP.NET

前言

有時有些必填的欄位會依某些欄位來決定是否為必填!

如上圖，勾了CheckBox後，後面的TextBox要為必填，如果沒有勾，後面的TextBox就不是必填的項目!

實作

我們可以透過ASP.NET的ValidatorEnable Function來達到這個目的哦!

1.建立檢查的Javascript Method(refreshEvaWay)

function refreshEvaWay(refreshFlag) {
    //如果refreshFlag沒傳值的話，表示全部的CheckBox都要檢查
    if (refreshFlag === undefined) {
        refreshFlag = 1 + 2;
    }

    var isValidate;
    if ((refreshFlag & 1) == 1) {
        var chkWay_1 = getByendwithId("chkWay_1")[0];
        var txtWay_1 = getByendwithId("txtWay_1")[0];
        isValidate = chkWay_1.checked;
        var txtWay_1_Validator = getByendwithId("vldWay_1")[0];
        //設定欄位必填與否
        ValidatorEnable(txtWay_1_Validator, isValidate);
    }
    if ((refreshFlag & 2) == 2) {

        var chkWay_2 = getByendwithId("chkWay_2")[0];
        var txtWay_2 = getByendwithId("txtWay_2")[0];
        isValidate = chkWay_2.checked;
        var txtWay_2_Validator = getByendwithId("vldWay_2")[0];
        //設定欄位必填與否
        ValidatorEnable(txtWay_2_Validator, isValidate);
    }
}
function getByendwithId(id) {
    //傳回物件id後面相同的jQuery物件
    return $("*[id$=" + id + "]");
}

2.在每次page載入時，設定checkBox值改變時，也要設定對應的物件是否為必填。同時檢查畫面必填項目。

$(document).ready(function () {
    //checkbox值改變時，要控制必填驗証
    var chkWay_1 = getByendwithId("chkWay_1");
    chkWay_1.change(function () {
        refreshEvaWay(1);
    });

    var chkWay_2 = getByendwithId("chkWay_2");
    chkWay_2.change(function () {
        refreshEvaWay(2);
    });
    //檢查設定畫面的必填項目
    refreshEvaWay();
});

測試範例

Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>ASP.NET透過Javascript控制必填驗証</title>
    <script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.7.1.min.js"></script>
    <script type="text/javascript">
        function getByendwithId(id) {
            //傳回物件id後面相同的jQuery物件
            return $("*[id$=" + id + "]");
        }

        function refreshEvaWay(refreshFlag) {
            //如果refreshFlag沒傳值的話，表示全部的CheckBox都要檢查
            if (refreshFlag === undefined) {
                refreshFlag = 1 + 2;
            }

            var isValidate;
            if ((refreshFlag & 1) == 1) {
                var chkWay_1 = getByendwithId("chkWay_1")[0];
                var txtWay_1 = getByendwithId("txtWay_1")[0];
                isValidate = chkWay_1.checked;
                var txtWay_1_Validator = getByendwithId("vldWay_1")[0];
                //設定欄位必填與否
                ValidatorEnable(txtWay_1_Validator, isValidate);
            }
            if ((refreshFlag & 2) == 2) {

                var chkWay_2 = getByendwithId("chkWay_2")[0];
                var txtWay_2 = getByendwithId("txtWay_2")[0];
                isValidate = chkWay_2.checked;
                var txtWay_2_Validator = getByendwithId("vldWay_2")[0];
                //設定欄位必填與否
                ValidatorEnable(txtWay_2_Validator, isValidate);
            }
        }

        $(document).ready(function () {
            //checkbox值改變時，要控制必填驗証
            var chkWay_1 = getByendwithId("chkWay_1");
            chkWay_1.change(function () {
                refreshEvaWay(1);
            });

            var chkWay_2 = getByendwithId("chkWay_2");
            chkWay_2.change(function () {
                refreshEvaWay(2);
            });
            //檢查設定畫面的必填項目
            refreshEvaWay();
        });

    </script>
</head>
<body>
    <form id="form1" runat="server">
    <table border="1">
        <tr>
            <td>
                評估方式
            </td>
            <td>
                <table>
                    <tr>
                        <td>
                        </td>
                        <td>
                            方式
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <asp:CheckBox ID="chkWay_1" runat="server" Text="學習分享" />
                        </td>
                        <td>
                            <asp:TextBox ID="txtWay_1" runat="server"></asp:TextBox>
                            <asp:RequiredFieldValidator ID="vldWay_1" runat="server"
                             ControlToValidate="txtWay_1"
                             ErrorMessage="(學習分享方式是必填的!)" ForeColor="red"></asp:RequiredFieldValidator>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <asp:CheckBox ID="chkWay_2" runat="server" Text="工作運用" />
                        </td>
                        <td>
                            <asp:TextBox ID="txtWay_2" runat="server"></asp:TextBox>
                            <asp:RequiredFieldValidator ID="vldWay_2" runat="server" 
                             ControlToValidate="txtWay_2"
                            ErrorMessage="(工作運用方式是必填的!)" ForeColor="red"></asp:RequiredFieldValidator>
                        </td>
                    </tr>
                </table>
            </td>
        </tr>
        <tr>
        <td colspan="2">
            <asp:Button ID="btnSubmit" runat="server" Text="送出" onclick="btnSubmit_Click" />
        </td>
        </tr>
    </table>
    </form>
</body>
</html>

Default.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        Response.Write("選取的評估方式<hr>");
        if (chkWay_1.Checked)
        {
            Response.Write("學習分享:" + txtWay_1.Text.Trim());
        }
        if (chkWay_2.Checked)
        {
            Response.Write("工作運用:" + txtWay_2.Text.Trim());
        }
        Response.Write("<hr>");
    }
}