我有一個使用母版頁的登錄頁面,我通過JavaScript應用驗證,但它不工作。JavaScript不工作在母版頁
<script type="text/javascript">
function checkField(form)
{
var id = document.getElementById('<% =txtLoginId.ClientID %>').value;
var pwd = document.getElementById('<% =txtPassword.ClientID %>').value;
alert("testing" + id);
if ((id == '' && pwd != '')|| (id == null && pwd != null)) {
lblUserId.visible = true;
form.txtLoginId.focus();
return false;
}
if ((pwd == '' && id != '') || (pwd == null && id != null)) {
lblPwd.visible = true;;
form.txtPassword.focus();
return false;
}
if ((id == '' && pwd == '') || (id == null && pwd == null)) {
lblBoth.visible = true;
form.txtLoginId.focus();
return false;
}
}
</script>
如果我的用戶名給予一定的價值它顯示我在警報,但如果我不給任何值,那麼如果條件應該工作,但它不工作,警報只是顯示「測試」。 這裏是我的html代碼。
<form id="form" method="post" action="Login.aspx">
<div style="left:37%;position:absolute;top:55%;background-color:red">
<table style="left:0%; position:absolute;top:0%; width: 265px">
<asp:Label ID="lblUserId" runat="server" ForeColor="Red" Visible="false" Text="* Username is Required!"></asp:Label>
<asp:Label ID="lblPwd" runat="server" ForeColor="Red" Visible="false" Text="* Passowrd is Required!"></asp:Label>
<asp:Label ID="lblBoth" runat="server" ForeColor="Red" Visible="false" Text="* Username and Password are Required!"></asp:Label>
</table>
</div>
<div style="left:37%;position:absolute;top:60%;background-color:red">
<table style="left:0%; position:absolute;top:0%; width: 265px;border:solid;background-color:darkorange">
<tr align="center">
<td align="center">
<asp:Label ID="lblHead" runat="server" Font-Bold="true" Text="Mobile Customer Order Tracking"></asp:Label>
</td>
</tr>
</table>
</div>
<div style="left:37%;position:absolute;top:65%">
<table style="border:solid;">
<tr>
<td>
<asp:Label ID="lblLoginId" runat="server" Text="Login ID"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtLoginId" ClientIDMode="Static" runat="server" />
</td>
</tr>
<tr>
<td>
<asp:Label ID="lblPassword" runat="server" Text="Password"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtPassword" TextMode="Password" ClientIDMode="Static" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label ID ="lblRemember" runat="server" Text="Remember My ID"></asp:Label>
<asp:CheckBox ID ="chkRemember" runat="server" />
</td>
<td align="right">
<asp:Button ID="btnLogin" runat="server" text="Login" OnClientClick="return checkField(this);"/>
</td>
</tr>
</table>
</div>
</form>
刪除'||'部分條件。當你使用鬆散相等時,'null'也用'=='''檢查。 – Teemu 2014-10-20 14:13:22
它不是以這種方式工作.. – 2014-10-20 14:16:14
您將一個按鈕傳遞給該函數,而不是一個表單,因此在checkField()內'form.txtLoginId'是'undefined'。這打破了代碼,'false'永遠不會被返回。您尚未打開控制檯以查看錯誤消息? – Teemu 2014-10-20 14:20:14