电子邮件字段验证功能 [英] Email Field Validation function

问题描述

我有以下功能

  function  validateEmail（） {
  var  emailID =  document  .form1.txtUEmail.value; 
 atpos = emailID.indexOf（  @）; 
 dotpos = emailID.lastIndexOf（ 。）; 
  if （atpos<  1  ||（dotpos  -  atpos<  2 ））{
 alert（ 请输入正确的电子邮件ID ）
  document  .form1.txtUEmail.focus（）; 
  return   false ; 
} 
  return （ true ）; 
} 

和文本字段是

 <   asp：TextBox     ID   =  txtUEmail   < span class =code-attribute> runat   =  server    CssClass   = 输入 >  <   / asp：TextBox  >  

和通话参数是

 btnSave.Attributes.Add（  onclick，  javascript：validateEmail（））; 

但我确实不工作意味着不生成alrt并保存记录是一个输入它。需要帮助

解决方案

我之前尝试使用jQuery Attr函数添加事件，它似乎不起作用。



我认为原因必须是客户必须以特定方式添加事件或事件是函数丢失。



尝试：

 btnSave.onclick = validateEmail; 

或

 btnSave.onclick =  function （）{
 validateEmail（）; 
} 

如果这不起作用，请告诉我，我会再看看^ _ ^



Andy



更新：



通过Jquery这更容易：

< script src =   https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.js>< /脚本> 
< script type =   text / javascript> 

; 
  function  validateEmail（）{
  var  emailTxt = 

（ input [id ='txtUEmail']）
< span class =code-keyword> var emailID =

（emailTxt）.val（）;
atpos = emailID.indexOf（ @）;
dotpos = emailID.lastIndexOf（ 。）;
if （atpos< 1 ||（dotpos - atpos< 2 ））{
alert（ 请输入正确的电子邮件ID ）

I have the following function

function validateEmail() {
        var emailID = document.form1.txtUEmail.value;
        atpos = emailID.indexOf("@");
        dotpos = emailID.lastIndexOf(".");
        if (atpos < 1 || (dotpos - atpos < 2)) {
            alert("Please enter correct email ID")
            document.form1.txtUEmail.focus();
            return false;
        }
        return (true);
    }

and the text field is

<asp:TextBox ID="txtUEmail" runat="server" CssClass="input"></asp:TextBox>

and calling statment is

btnSave.Attributes.Add("onclick", "javascript:validateEmail()");

But i does not working means does not generate the alrt and save the record is a enter it. Help is needed

解决方案

I have tried adding events using the jQuery Attr function before and it doesn't seem to work.

I think the reason must be that the client has to add the event in a particular way or the fact that it's a function gets lost.

Try:

btnSave.onclick = validateEmail;

or

btnSave.onclick = function(){
 validateEmail();
}

If that doesn't work, let me know and I'll look further ^_^

Andy

UPDATE:

Via Jquery this is much easier:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.js"></script>
<script type="text/javascript">

;
function validateEmail() {
        var emailTxt =

("input[id='txtUEmail']") var emailID =

(emailTxt).val(); atpos = emailID.indexOf("@"); dotpos = emailID.lastIndexOf("."); if (atpos < 1 || (dotpos - atpos < 2)) { alert("Please enter correct email ID")

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