Question

在以下法典中,我试图获得选箱,以在盒子旁展示一个信息,如果它没有选择男女的价值。如果选择其中一种数值,则不显示这种数值。但它有工作要做,它用电子邮件和密码的正文进行细微工作,任何人都能够看到,该信客为什么工作,帮助我回答。

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<!-- saved from url=(0045)https://vle.wit.ie/file.php/8220/lab5pt2.html -->
<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<script type="text/javascript">

function validate_gender(field,alerttxt)
{

with (field){
apos=value.indexOf("0");

if (apos>0)
{
document.getElementById( gender_help ).innerHTML="";
return true;
}else{

document.getElementById( gender_help ).innerHTML=alerttxt; 
return false;

}


}

}
function validate_email(field,alerttxt)
{
with (field)
  {
  apos=value.indexOf("@");
  dotpos=value.lastIndexOf(".");
  if (apos<1||dotpos-apos<2)
    {document.getElementById( email_help ).innerHTML=alerttxt;return false; }
  else {document.getElementById( email_help ).innerHTML="";return true;}
  }
}

function validate_password(field, alerttxt){

with (field){
var re = /^[a-zA-Z0-9]{6,8}$/;

if (re.test(value))
{
document.getElementById( pass_help ).innerHTML="";
return true;
}else{

document.getElementById( pass_help ).innerHTML=alerttxt; 
return false;

}


}

}


function validate_required(field,alerttxt)
{
with (field)
  {
  if (value==null||value=="")
    {
    alert(alerttxt);return false;
    }
  else
    {
    return true;
    }
  }
}

function validate_form(thisform)
{
with (thisform)
  {
   if (!validate_gender(gender,"A Valid gender is Required"))
  {gender.focus();return false;}
  if (!validate_email(email,"A Valid Email is Required"))
  {email.focus();return false;}
  if (!validate_password(pass,"Password must be between 6 and 8 characters and contain both numbers and alphas"))
  {pass.focus();return false;}
  }
}
</script>
</head>

<body>
<form action="" onsubmit="return validate_form(this)" method="post">
What is your gender?<br /> 
<select name="gender" ><span id="gender_help"></span>
                                <option value="0" selected="selected">Select...</option>
                                <option value="M">Male</option>
                                <option value="F">Female</option>
                            </select><br/>

Email: <input type="text" name="email" size="30" ><span id="email_help"></span><br>
Password <input type="password" name="pass" size="30"><span id="pass_help"></span><br>

<input type="submit" value="Submit">
</form>

</body></html>

Answer 1

www.un.org/Depts/DGACM/index_spanish.htm 这是一种令人震惊的反家长的表现!

Don t use with.
Cache your selectors i.e. var emailHelper = document.getElementById( email_help )
Don t use inline javascript i.e onClick=
Consider using a library like jQuery to handle events in a cross-browser way.
Generally it s not good to put braces on a new line.
You shouldn t have a <span> inside of the <select> element.

http://javascript.crockford.com/“rel=“nofollow noretinger”http://javascript.crockford.com/或。某些其他ps和trick。更多关于<<>t>not至>的:。是否合法使用 Java的“附号”

Now on to the actual question!

你们对挑选的箱子感到不安。让我们尝试这样的事情:

var genderHelper = document.getElementById( gender_help )

function validate_form(thisform) {
    // your other stuff
   if (!validate_gender(thisform.gender.value,"A Valid gender is Required")) {
       thisform.gender.focus();
       return false;
   }
}

function validate_gender(gender, error) {
  var validGender = (gender === "M" || gender === "F")
  if (!validGender) {
      genderHelper.innerHTML = error
  }
  return validGender
}

Update

在jsFiddle I ve玩 playing后发现,问题似乎是:<span> tag在<select> tag中封顶,因此,你可以发现。

Here s a working version mostly using your code:

http://jsfiddle.net/6buUJ/1/

Answer 2

You can not display text in a select area that is not an option or a optgroup. I think it better to :

在不选择性别的情况下,在选择领域和展示领域时,需要增加一段时期。
如果性别错乱,或将选定区域交回。

Answer 3

你们可以在一个选定要素内打上最短的距离。

不过,你可以更新其中一项内容,使用户能够看到案文。

也许仅仅在选择的下一个时间段是最好的。

html

<select name="gender" ><span id="gender_help"></span>
                                <option value="0" selected="selected">Select...</option>
                                <option value="M">Male</option>
                                <option value="F">Female</option>
                            </select>

Answer 4

0>indexOf(0")0

M.indexOf(0") is 1

www.un.org/Docs/journal/Ar/pdf

页: 1 页: 1 }

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