重置單選按鈕

Question

這是包含我的代碼的小提琴-http: //jsfiddle.net/jamiepollard28/sDLV4/8/

我試圖使代碼僅在用戶單擊單選按鈕驗證的警報框中的取消時重置單選按鈕。

當您單擊包含所需數據的submt並選中一個單選按鈕時，將彈出一個確認或拒絕該選擇的警報框，當我在該警報框中單擊“取消”時，我希望重置單選按鈕的選擇。

下面是我的代碼。

<html>
<head>
<title>Exam entry</title>
<script language="javascript" type="text/javascript">
window.onload=function(){
window.validateForm=function() {
    var result = true;
    var msg = "";
    var focusname="";
    if (document.ExamEntry.name.value == "") {
        msg += "You must enter your name \n";
        focusname="name";
        //document.ExamEntry.name.focus();
        document.getElementById('name1').style.color = "red";
        //result = false;
    }
    if (document.ExamEntry.subject.value == "") {
        msg += "You must enter the subject \n";
       // document.ExamEntry.subject.focus();
        if (focusname=="")
        {
        focusname="subject";
        }
        document.getElementById('subject1').style.color = "red";
        //result = false;
    }
    var Number = document.ExamEntry.Exam_Number.value
    if (Number == "") {
        msg += "You must enter the exam Number \n";
        //document.ExamEntry.Exam_Number.focus();
        if (focusname=="")
        {
        focusname="Exam_Number";
        }
        document.getElementById('Exam_Number1').style.color = "red";
        //result = false;
    }else if (Number.length != 4) {
        msg += "You must enter at least Four Numbers in the Exam Number \n";
         if (focusname=="")
        {
        focusname="Exam_Number";
        }
        //document.ExamEntry.Exam_Number.focus();
        document.getElementById('Exam_Number1').style.color = "red";
        //result = false;
    }
else if (isNaN(Number)) {
        msg += "You must enter at least four numeric characters in the Exam Number feild \n";
     if (focusname=="")
        {
        focusname="Exam_Number";
        }   
    // document.ExamEntry.Exam_Number.focus();
        document.getElementById('Exam_Number1').style.color = "red";
        //result = false;
    }
    var valchecked = '';
    var len = document.getElementsByName('examtype').length;

    for (i = 0; i < len; i++) {

if ( document.ExamEntry.examtype[i].checked ) {

valchecked = document.ExamEntry.examtype[i].value;
 break;

}

}
    if (valchecked == '') {
        msg += "Select Exam Type";
        document.getElementById('Exam_Type').style.color = "red";
         if (focusname=="")
        {
        focusname="examtype_GCSE";
        }

    } 

    if (msg != ""){
        alert(msg)
        document.getElementById(focusname).focus();
        return false;
    }else{
        return confirm('You have chosen ' + valchecked + ' is this correct?');
    }

}
}//]]>  

</script>


</head>
<body>
  <h1>Exam Entry Form</h1>
<form name="ExamEntry" method="post" action="success.html">
<table width="50%" border="0">
<tr>
<td id="name1">Name</td>
<td><input type="text" name="name"  id="name" /></td>
</tr>
<tr>
<td id="subject1">Subject</td>
<td><input type="text" name="subject" id="subject"/></td>
</tr>
<tr>
<td id="Exam_Number1">Exam Number</td>
<td><input type="text" name="Exam_Number" id="Exam_Number" ><font size="3">(Maximum characters: 4)</font> </td>
</tr>
<tr>

<table><form action="">
<td id="Exam_Type">Exam Type</td>
<tr><td><input type="radio" id="examtype_GCSE" name="examtype" value="GCSE" /> : GCSE<br /></tr>
<tr><td><input type="radio" id="examtype_AS" name="examtype" value="AS"/> : AS<br /></tr>
<tr><td><input type="radio" id="examtype_A2" name="examtype" value="A2" /> : A2<br /></tr>
<tr><td><input type="submit" name="Submit" value="Submit" onclick="return validateForm();" /></td>
<td><input type="reset" name="Reset" value="Reset" /></td>
</tr>
</table>
</form>

</body>


</html>

Answer 1

您只是在返回用戶選擇，您需要首先檢查它，如果為true，則為表單提交返回true，否則重置單選並返回false，如下所示： FIDDLE

    var ch=  confirm('You have chosen ' + valchecked + ' is this correct?');
    if(!ch){
        document.getElementById('examtype_'+valchecked).checked= false;
        return false; }
    else 
        return true;
   }

Answer 2

使用if循環可以解決問題

嘗試以下代碼

if(confirm('You have chosen ' + valchecked + ' is this correct?')){
            return true;
        }
        else{           
            document.getElementById('examtype_'+valchecked).checked= false;         
            return false;
        }

重置單選按鈕

問題描述

2 個解決方案

解決方案1
1 2014-03-12 10:51:21

解決方案2
0 2014-03-12 10:53:54

重置單選按鈕

問題描述

2 個解決方案

解決方案1 1 2014-03-12 10:51:21

解決方案2 0 2014-03-12 10:53:54

解決方案1
1 2014-03-12 10:51:21

解決方案2
0 2014-03-12 10:53:54