Question

我有问题，如果我动态添加电子邮件输入而不是验证后，如果我在第一个输入中输入一些值而不是在secound电子邮件字段中，我会收到很多警报

function isEmail(email) {

emailValue=email.value;

var regex = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/i;

var res = regex.test(emailValue);

if (res==false){

alert("Enter valid email");

  }
}

动态创建电子邮件字段的代码 -

        container.appendChild(document.createTextNode("email"));
        var input_e = document.createElement("input");
        input_e.type = "email";
        input_e.id= id+'_email';
        input_e.name= "email[]";
        input_e.required =true;
        input_e.setAttribute('onblur', 'return isEmail(email)');
        container.appendChild(input_e);

        container.appendChild(document.createElement("br"));
        container.appendChild(document.createElement("br"));

HTML code：

      Email :
      <input type="email" id="email" name="email[]" placeholder="Enter email" onblur="return isEmail(email)" required>
        <input type="button" id="newAutocomplete" onclick="addFields();" value="add" />
      <br><br>
 <div id="container" />

Answer 1

如果我找到你的财产，你必须使用 -

function isEmail(email) {

  emailValue=email.value;

var regex = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/i;

  var res = regex.test(emailValue);

  if (res==false && !window.alertedOnce){
  window.alertedOnce = true; // Use like a flag and set-rest as per your requirement
  alert("Enter valid email");

  }
}

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