如何在 HTML 表单中使用 javascript 检查单选按钮验证答案

【问题标题】：How to check the Radio button validation using javascript in HTML form如何在 HTML 表单中使用 javascript 检查单选按钮验证
【发布时间】：2016-05-27 04:00:01
【问题描述】：

我需要验证单选按钮输入，即当按下提交按钮并且没有选择单选按钮时，它会提醒用户说“请选择选项”，如果已选择单选按钮，则只需提交表单并且页面重定向到另一个页面，不需要警报。但是在我的代码中，每当我按下提交按钮时。即使选择了所有单选按钮，它也会显示“请选择选项”。请帮忙。

<!DOCTYPE html>
<html>
 <head>

  <style>
   label{display:inline-block;width:100px;margin-bottom:10px;}
  </style>
    <title>PVQ Questionary</title>

<!-- =========================================================== -->
<script LANGUAGE="JavaScript">
function validateForm() {
    var radios = document.getElementsByName("yes no");
    var formValid = false;

    var i = 0;
    while (!formValid && i < radios.length) {
        if (radios[i].checked) formValid = true;
        i++;        
    }

    if (!formValid) alert("Must check some option!");
    return formValid;
}
</script>
<!-- =========================================================== -->


 </head>

<body>

<form name="form1" action="process.php" onsubmit="return validateForm()" method="post">

<!-- <form method="post" action="process.php"> -->

    <label>First Name</label>
    <input type="text" name="first_name" />
    <br />

    <label>Last Name</label>
    <input type="text" name="last_name" />
    <br />

    <label>Department</label>
    <input type="text" name="department" />
    <br />

    <label>Email</label>
    <input type="text" name="email" />
    <br />

    <label>Location</label>
    <input type="text" name="location" />
    <br />

  <label>Sex</label>
    <input type="radio" name="sex" value="male" >Male
    <br/>


<div align="center">
<FONT size="" color="blue"> 
<h1>Portrait Values Questionnaire (PVQ) for Male </h1>
<h2> Here we briefly describe some people. Please read each description and think about how much each person is or is not like you. Put an "Yes" or "No" in the given options that shows how much the person in the description is like you.</h2>
</div>
</FONT> 

<h3>1. Thinking up new ideas and being creative is important to him. He likes to do things in his own original way.</h3>
    <input type="radio" name="answer1" value="yes" >Yes
    <input type="radio" name="answer1" value="no">No
    <br/>


<h3>2. It is important to him to be rich. He wants to have a lot of money and expensive things.</h3>
    <input type="radio" name="answer2" value="yes" >Yes
    <input type="radio" name="answer2" value="no">No
    <br/>


<h3>3. He thinks it is important that every person in the world be treated equally. He believes everyone should have equal opportunities in life.</h3>
    <input type="radio" name="answer3" value="yes" >Yes
    <input type="radio" name="answer3" value="no">No
    <br/>

<h3>4. It's very important to him to show his abilities. He wants people to admire what he does.</h3>
    <input type="radio" name="answer4" value="yes" >Yes
    <input type="radio" name="answer4" value="no">No
    <br/>

<h3>5.It is important to him to live in secure surroundings. He avoids anything that might endanger his safety.</h3>
    <input type="radio" name="answer5" value="yes" >Yes
    <input type="radio" name="answer5" value="no">No
    <br/>

<h3>6.He thinks it is important to do lots of different things in life. He always looks for new things to try.</h3>
    <input type="radio" name="answer6" value="yes" >Yes
    <input type="radio" name="answer6" value="no">No
    <br/>


<h3>7.He believes that people should do what they're told. He thinks people should follow rules at all times, even when no-one is watching.</h3>
    <input type="radio" name="answer7" value="yes" >Yes
    <input type="radio" name="answer7" value="no">No
    <br/>


<h3>8.It is important to him to listen to people who are different from him. Even when he disagrees with them, he still wants to understand them.</h3>
    <input type="radio" name="answer8" value="yes" >Yes
    <input type="radio" name="answer8" value="no">No
    <br/>


<h3>9.He thinks it's important not to ask for more than what you have. He believes that people should be satisfied with what they have.</h3>
    <input type="radio" name="answer9" value="yes" >Yes
    <input type="radio" name="answer9" value="no">No
    <br/>


<h3>10.He seeks every chance he can to have fun. It is important to him to do things that give him pleasure.</h3>
    <input type="radio" name="answer10" value="yes" >Yes
    <input type="radio" name="answer10" value="no">No
    <br/>


<h3>11.It is important to him to make his own decisions about what he does. He likes to be free to plan and to choose his activities for himself.</h3>
    <input type="radio" name="answer11" value="yes" >Yes
    <input type="radio" name="answer11" value="no">No
    <br/>


<h3>12.It's very important to him to help the people around him. He wants to care for their well-being.</h3>
    <input type="radio" name="answer12" value="yes" >Yes
    <input type="radio" name="answer12" value="no">No
    <br/>


<h3>13.Being very successful is important to him. He likes to impress other people.</h3>
    <input type="radio" name="answer13" value="yes" >Yes
    <input type="radio" name="answer13" value="no">No
    <br/>


<h3>14.It is very important to him that his country be safe. He thinks the state must be on watch against threats from within and without.</h3>
    <input type="radio" name="answer14" value="yes" >Yes
    <input type="radio" name="answer14" value="no">No
    <br/>


<h3>15.He likes to take risks. He is always looking for adventures.</h3>
    <input type="radio" name="answer15" value="yes" >Yes
    <input type="radio" name="answer15" value="no">No
    <br/>


<h3>16.It is important to him always to behave properly. He wants to avoid doing anything people would say is wrong.</h3>
    <input type="radio" name="answer16" value="yes" >Yes
    <input type="radio" name="answer16" value="no">No
    <br/>


<h3>17.It is important to him to be in charge and tell others what to do. He wants people to do what he says.</h3>
    <input type="radio" name="answer17" value="yes" >Yes
    <input type="radio" name="answer17" value="no">No
    <br/>


<h3>18.It is important to him to be loyal to his friends. He wants to devote himself to people close to him.</h3>
    <input type="radio" name="answer18" value="yes" >Yes
    <input type="radio" name="answer18" value="no">No
    <br/>


<h3>19.He strongly believes that people should care for nature. Looking after the environment is important to him.</h3>
    <input type="radio" name="answer19" value="yes" >Yes
    <input type="radio" name="answer19" value="no">No
    <br/>


<h3>20.Religious belief is important to him. He tries hard to do what his religion requires.</h3>
    <input type="radio" name="answer20" value="yes" >Yes
    <input type="radio" name="answer20" value="no">No
    <br/>


<h3>21.It is important to him that things be organized and clean. He really does not like things to be a mess.</h3>
    <input type="radio" name="answer21" value="yes" >Yes
    <input type="radio" name="answer21" value="no">No
    <br/>

<h3>22. He thinks it's important to be interested in things. He likes to be curious and to try to understand all sorts of things.</h3>
    <input type="radio" name="answer22" value="yes" >Yes
    <input type="radio" name="answer22" value="no">No
    <br/>


<h3>23. He believes all the worlds’ people should live in harmony. Promoting peace among all groups in the world is important to him.</h3>
    <input type="radio" name="answer23" value="yes" >Yes
    <input type="radio" name="answer23" value="no">No
    <br/>


<h3>24.He thinks it is important to be ambitious. He wants to show how capable he is.</h3>
    <input type="radio" name="answer24" value="yes" >Yes
    <input type="radio" name="answer24" value="no">No
    <br/>


<h3>25.He thinks it is best to do things in traditional ways. It is important to him to keep up the customs he has learned.</h3>
    <input type="radio" name="answer25" value="yes" >Yes
    <input type="radio" name="answer25" value="no">No
    <br/>


<h3>26.Enjoying life's pleasures is important to him. He likes to 'spoil' himself.</h3>
    <input type="radio" name="answer26" value="yes" >Yes
    <input type="radio" name="answer26" value="no">No
    <br/>


<h3>27.It is important to him to respond to the needs of others. He tries to support those he knows.</h3>
    <input type="radio" name="answer27" value="yes" >Yes
    <input type="radio" name="answer27" value="no">No
    <br/>


<h3>28.He believes he should always show respect to his parents and to older people. It is important to him to be obedient.</h3>
    <input type="radio" name="answer28" value="yes" >Yes
    <input type="radio" name="answer28" value="no">No
    <br/>


<h3>29.He wants everyone to be treated justly, even people he doesn't know. It is important to him to protect the weak in society.</h3>
    <input type="radio" name="answer29" value="yes" >Yes
    <input type="radio" name="answer29" value="no">No
    <br/>


<h3>30.He likes surprises. It is important to him to have an exciting life.</h3>
    <input type="radio" name="answer30" value="yes" >Yes
    <input type="radio" name="answer30" value="no">No
    <br/>


<h3>31.He tries hard to avoid getting sick. Staying healthy is very important to him.</h3>
    <input type="radio" name="answer31" value="yes" >Yes
    <input type="radio" name="answer31" value="no">No
    <br/>


<h3>32.Getting ahead in life is important to him. He strives to do better than others.</h3>
    <input type="radio" name="answer32" value="yes" >Yes
    <input type="radio" name="answer32" value="no">No
    <br/>


<h3>33.Forgiving people who have hurt him is important to him. He tries to see what is good in them and not to hold a grudge.</h3>
    <input type="radio" name="answer33" value="yes" >Yes
    <input type="radio" name="answer33" value="no">No
    <br/>


<h3>34.It is important to him to be independent. He likes to rely on himself.</h3>
    <input type="radio" name="answer34" value="yes" >Yes
    <input type="radio" name="answer34" value="no">No
    <br/>


<h3>35.Having a stable government is important to him. He is concerned that the social order be protected.</h3>
    <input type="radio" name="answer35" value="yes" >Yes
    <input type="radio" name="answer35" value="no">No
    <br/>


<h3>36.It is important to him to be polite to other people all the time. He tries never to disturb or irritate others.</h3>
    <input type="radio" name="answer36" value="yes" >Yes
    <input type="radio" name="answer36" value="no">No
    <br/>


<h3>37.He really wants to enjoy life. Having a good time is very important to him.</h3>
    <input type="radio" name="answer37" value="yes" >Yes
    <input type="radio" name="answer37" value="no">No
    <br/>


<h3>38. It is important to him to be humble and modest. He tries not to draw attention to himself.</h3>
    <input type="radio" name="answer38" value="yes" >Yes
    <input type="radio" name="answer38" value="no">No
    <br/>


<h3>39. He always wants to be the one who makes the decisions. He likes to be the leader.</h3>
    <input type="radio" name="answer39" value="yes" >Yes
    <input type="radio" name="answer39" value="no">No
    <br/>


<h3>40. It is important to him to adapt to nature and to fit into it. He believes that people should not change nature.</h3>
    <input type="radio" name="answer40" value="yes" >Yes
    <input type="radio" name="answer40" value="no">No
    <br/>

<input type="submit" value="SUBMIT">
</form>
</body>
</html>

【问题讨论】：

document.getElementsByName("yes no") 使用“名称”属性的值，但您的单选按钮具有 answer1 等名称，因此您可能需要另一种获取所有单选按钮的方法
@mzulch，哦。我的错误，请任何提示

标签： javascript html forms

【解决方案1】：

function asd(e) {
  var r = document.getElementsByName("container");
  for (var i = 0; i < r.length; i++) {
    if (r[i].checked) {
      alert(r[i].value);
      return;
    }
  }
  alert("ther ware som problem \n 1.you moust choose acup or cone");
  e.preventDefault()
}

window.onload = function() {
  document.getElementById("IceCreamForm").addEventListener("submit", function(e) {
    asd(e);
  });
}

【讨论】：

【解决方案2】：

尝试用这个替换你的函数。您还需要添加以下 CSS 样式以突出显示错过的复选框。我通常使用 jquery 并返回一个类数组，但这样你可以指定问题的数量。这也为您的用户提供了关于错过哪个复选框的指示。还假设您的元素名称格式为“answerxx”

<style>
.error {
        border: 2px solid red;
        padding:4px;
    }
</style>

<script>

    function validateForm() {
    var questions = 40 //Set the total number of questions
    var goodForm = true; //default is form is fine

    for(var i=1; i <= questions; i++)
    {
        //get array of checkboxes for each question by name
        radio = document.getElementsByName("answer" + i)

        //check whether there is at least one radio selected
        if(!(radio[0].checked||radio[1].checked))
            {
            //if not, add the .error class/style
            radio[0].previousElementSibling.classList.add("error");
            goodForm = false;
        }
        else
        {
            //remove the class if it is ok, need this if user submits again
            radio[0].previousElementSibling.classList.remove("error");
        }

    }
    //alert user on error, and return form validation status
    if(!goodForm) alert("Please check the options highlighted in red")
    return goodForm;

}
</script>

【讨论】：

有6个单选按钮，而不是yes，no。从 1 到 6。所以我想验证以下方式，pastebin.com/be6vMdxZ，但是如果我勾选它，我会得到选项 1 和 2。

【解决方案3】：

The thing is you have done the checking weather the radio is selected or not only once and which is to be done for all the available radio buttons.
for (i = 0; i < radios.length; i++) { 
    var radios = document.getElementsByName("yes no");
    var formValid = false;  
}

【讨论】：

【解决方案4】：

另辟蹊径，

<script type="text/javascript">
function validateForm(daForm) {
    // check all rb radio buttons
    for (var i = 1; i <= 40; i++) {
        if (! getCheckedRadioValue(daForm["answer"+i])) {
            alert ("Please select a value for Question " + i)
            return false
        }
    }
    // add other checks here...
    return true
}
function getCheckedRadioValue(radio) {
    for (var i=0; i < radio.length; i++) {
        if (radio[i].checked) return radio[i].value
    }
    return false
}
</script>

【讨论】：

【解决方案5】：

没有查看代码和验证（我同意@mzulch），我正在考虑一种稍微不同的方法。鉴于有 40 个问题，您可以尝试一种时髦的方法来确保所有问题都已被选中。

您可以创建一个数组（以编程方式查找问题的数量，然后创建数字数组）导致一个包含所有 40 个数字的数组（请注意，数组索引为零 - 这意味着第一个值可能是“1”，但它将被索引为“0”）。然后选择单选按钮时，触发从阵列中删除该数字的函数。当按下提交按钮时——如果数组中还有任何数字——你可以提醒用户他们错过了一个选项，并且由于数字与问题相关，可以具体告诉用户哪个选项/s 他们需要复习。

只是一种稍微不同的方法，但也许有用。希望这会有所帮助，gavgrif

【讨论】：

【解决方案6】：

您的主要问题是您没有在单选元素上循环，下面的选择器不会找到任何东西。

var radios = document.getElementsByName("yes no");

你会希望这是一个无线电元素的数组：

var form = document.forms.formID;
var radios = form.elements;

那么你可以或多或少地运行你已经拥有的代码。

【讨论】：