javascript - 单选按钮验证错误

Question

对于下面验证函数中的性别单选按钮验证，只要没有选择性别单选按钮，就会出现警报。但是，只要在浏览器中选择“确定”，就会提交表单。似乎是什么导致了这个问题？另外，如果可能的话，我希望它在返回 false 时像其余部分一样集中注意力。

JavaScript

 function validate()
{
var gender = document.getElementsByName("gender");
   if( document.myForm.firstname.value == "" )
   {
     alert( "Please provide your first name!" );
     document.myForm.firstname.focus() ;
     return false;
   }
     if( document.myForm.lastname.value == "" )
   {
     alert( "Please provide your last name!" );
     document.myForm.lastname.focus() ;
     return false;
   }
     if( document.myForm.email.value == "" )
   {
     alert( "Please provide your email!" );
     document.myForm.email.focus() ;
     return false;
   }
     if( (gender[0].checked == false) && (gender[1].checked == false))
   {
     alert( "Please provide your gender!" );
     document.myForm.male.focus() ;
     return false;
   }
     if( document.myForm.date.value == "" )
   {
     alert( "Please provide a date to be performed!" );
     document.myForm.date.focus() ;
     return false;
   }
     if( document.myForm.vname.value == "" )
   {
     alert( "Please provide a victim's name!" );
     document.myForm.vname.focus() ;
     return false;
   }
     if( document.myForm.vemail.value == "" )
   {
     alert( "Please provide the victim's email!" );
     document.myForm.vemail.focus() ;
     return false;
   }
   return( true );
}

HTML:

<div id="box">
<form action="/cgi-bin/test.cgi" name="myForm"  onsubmit="return(validate());">
<h1> Truth </h1>
<label> First Name: </label> <input type="text" name="firstname" id="firstname" maxlength="30" placeholder="John" /> <br><br>
<label> Last Name: </label> <input type="text" name="lastname" id="lastname" maxlength="30" placeholder="Doe" /> <br><br>
<label> Email:</label> <input type="text" name="email" id="email" placeholder="user@mydomain.com" /> <br><br>
<label> Male </label><input type="radio" name="gender" id="gender" value="male"/>
<label> Female </label><input type="radio" name="gender" id="gender" value="female"/> <br><br>
<label> Date to be performed: </label><input type="date" name="date" id="date" /><br><br>
<h2> Victim </h2>
<label> Name: </label>  <input type="text" name="vname" id="vname" maxlength="30" placeholder="Mary Jane" /><br><br>
 <label> Email:</label> <input type="text" name="vemail" id="vemail" placeholder="user@mydomain.com" /> <br><br>


    <h2> Please select a truth questions below </h2> <br>
<input type="radio" name="truth" value="q1"> Have you ever fallen and landed on your head? <br>

  <input type="radio"  name="truth" value="q2"> Have you ever return too much change? <br>

  <input type="radio" name="truth" value="q3"> Have you ever been admitted into the hospital? <br>

  <input type="radio" name="truth" value="q4"> Have you ever baked a cake? <br>

  <input type="radio" name="truth" value="q5"> Have you ever cheated on test? <br>

  <input type="radio" name="truth" value="q6"> Did you ever wish you were never born? <br>

  <input type="radio" name="truth" value="q7"> Did you ever hide from Sunday School? <br><br>
<input type="submit" value="Submit"/> <br>
</form> 
</div>

Answer 1

我已经找到解决办法了。而不是:

if( (gender[0].checked == false) && (gender[1].checked == false))
 {
  alert( "Please provide your gender!" );
     document.myForm.male.focus() ;
     return false;
   }

应该是:

  if( (gender[0].checked == false) && (gender[1].checked == false))
   {
     alert( "Please provide your gender!" );
     document.myForm.male.focus() ;
     return true;
   }

我这样做了并且验证工作正常。