Javascript 如果选中单选按钮，则对复选框执行验证
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If Radio Button is selected, perform validation on Checkboxes
提问by mpdc
I'm trying to work this form so when the first radio button is selected, run a certain validation. When the second radio button is selected, run a different validation, etc. Currently using Alerts to check the functionality, but whichever radio button I choose I do not receive any feedback.
我正在尝试使用此表单，以便在选择第一个单选按钮时运行某个验证。当第二个单选按钮被选中时，运行不同的验证等。目前使用警报来检查功能，但无论我选择哪个单选按钮，我都没有收到任何反馈。
javascript function
javascript函数
<script type="text/javascript">
function validateDays() {
if (document.form1.radio1[0].checked == true) {
alert("You have selected Option 1");
}
else if (document.form1.radio1[1].checked == true) {
alert("You have selected Option 2");
}
else if (document.form1.radio1[2].checked == true) {
alert("You have selected Option 3");
}
else {
// DO NOTHING
}
}
}
</script>
html input code
html输入代码
<input name="radio1" type="radio" value="option1" id="option1" onClick="validateDays();">
<input name="radio1" type="radio" value="option2" id="option2" onClick="validateDays();">
<input name="radio1" type="radio" value="option3" id="option3" onClick="validateDays();">
How do I get a different alert depending on which radio button is checked?
如何根据选中的单选按钮获得不同的警报？
Eventually, each radio button will limit the number of checkboxes further down the form the user is able to select - which is why I cannot work this validation purely in to the onClick()
最终，每个单选按钮都会限制用户可以选择的表单下方的复选框数量 - 这就是为什么我不能纯粹在 onClick() 中进行此验证
MORE FULL CODE - ON REQUEST
更完整的代码 - 根据要求
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js" ></script>
<script type="text/javascript">
$(document).ready(function() {
jQuery('#3daypass').click(function mattcode() {
jQuery('#other_2 , #other_3 , #other_4').prop('checked', true);
});
jQuery('#2daypass , #1daypass').click(function mattcode() {
jQuery('#other_2 , #other_3 , #other_4').prop('checked', false);
});
});
</script>
<script type="text/javascript">
function validateDays() {
if (document.getElementById('3daypass').checked) {
alert("You have selected Option 1");
}
else if (document.getElementById('2daypass').checked) {
alert("You have selected Option 2");
}
else if (document.getElementById('1daypass').checked) {
alert("You have selected Option 3");
}
else {
// DO NOTHING
}
}
}
</script>
<tr>
<td colspan="5" align="left"><table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="65%" valign="top"><table width="100%" height="100%" border="0" cellpadding="2" cellspacing="0">
<tr valign="middle">
<td height="18" colspan="2" align="left" bgcolor="#000000"><span class="boxheader"><strong> Conference Pass</strong></span> <span class="bodycopyWhite"> - (Please select a day pass below)</span></td>
</tr>
<tr valign="middle">
<td colspan="2" align="left" bgcolor="#EBEBEB"><img src="spacer.gif" width="1" height="3"></td>
</tr>
<tr bgcolor="#EBEBEB">
<td align="center" valign="top" bgcolor="#EBEBEB"><table width="100%" border="0" cellspacing="0" cellpadding="2">
<tr>
<td width="7%"><input name="other_1" type="radio" value="3daypass" id="3daypass" onClick="Payment_Total(); check_code(); Vat_Total(); validateDays();"></td>
<td width="93%" class="bodyNormal"><strong>Three-day</strong> open delegate pass</td>
</tr>
<tr>
<td><input name="other_1" type="radio" value="2daypass" id="2daypass" onClick="Payment_Total(); check_code(); Vat_Total(); validateDays();"></td>
<td class="bodyNormal"><strong>Two-day</strong> open delegate pass</td>
</tr>
<tr>
<td><input name="other_1" type="radio" value="1daypass" id="1daypass" onClick="Payment_Total(); check_code(); Vat_Total(); validateDays();"></td>
<td class="bodyNormal"><strong>One-day</strong> open delegate pass</td>
</tr>
</table></td>
</tr>
<tr valign="middle">
<td colspan="2" align="left" bgcolor="#EBEBEB"><img src="spacer.gif" width="1" height="3"></td>
</tr>
</table>
<br>
<table width="100%" border="0" cellspacing="0" cellpadding="2">
<tr>
<td height="20" colspan="2" bgcolor="#000000" class="boxheader"><strong> Please select the days you will be attending</strong></td>
</tr>
<tr>
<td width="9%" bgcolor="#EBEBEB"><input name="other_2" type="checkbox" id="other_2" value="Tues 5 Feb"></td>
<td width="91%" bgcolor="#EBEBEB" class="bodycopy">Tuesday 5 February 2013 </td>
</tr>
<tr>
<td bgcolor="#EBEBEB"><input name="other_3" type="checkbox" id="other_3" value="Wed 6 Feb"></td>
<td bgcolor="#EBEBEB" class="bodycopy">Wednesday 6 February 2013 </td>
</tr>
<tr>
<td bgcolor="#EBEBEB"><input name="other_4" type="checkbox" id="other_4" value="Thurs 7 Feb"></td>
<td bgcolor="#EBEBEB" class="bodycopy">Thursday 7 February 2013 </td>
</tr>
Apologies for the messy code - This was written in 2005 by someone else (with an apparent phobia of CSS) - see what I have to work with?!
为凌乱的代码道歉 - 这是 2005 年由其他人写的（明显对 CSS 有恐惧） - 看看我必须处理什么？！
回答by Lloyd Banks
function validateDays() {
if (document.getElementById("option1").checked == true) {
alert("You have selected Option 1");
}
else if (document.getElementById("option2").checked == true) {
alert("You have selected Option 2");
}
else if (document.getElementById("option3").checked == true) {
alert("You have selected Option 3");
}
else {
// DO NOTHING
}
}
回答by ThiefMaster
You need to use ==or ===for comparison. =assignsa new value.
您需要使用==或===进行比较。=分配一个新值。
Besides that, using ==is pointless when dealing with booleans only. Just use if(foo)instead of if(foo == true).
除此之外，==仅在处理布尔值时使用是没有意义的。只需使用if(foo)代替if(foo == true).
回答by user160820
You must use the equalsoperator not the assignmentlike
您必须使用等于运算符而不是像这样的赋值
if(document.form1.radio1[0].checked == true) {
alert("You have selected Option 1");
}
回答by Fernando
Full validation example with javascript:
使用 javascript 的完整验证示例：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Radio button: full validation example with javascript</title>
<script>
function send() {
var genders = document.getElementsByName("gender");
if (genders[0].checked == true) {
alert("Your gender is male");
} else if (genders[1].checked == true) {
alert("Your gender is female");
} else {
// no checked
var msg = '<span style="color:red;">You must select your gender!</span><br /><br />';
document.getElementById('msg').innerHTML = msg;
return false;
}
return true;
}
function reset_msg() {
document.getElementById('msg').innerHTML = '';
}
</script>
</head>
<body>
<form action="" method="POST">
<label>Gender:</label>
<br />
<input type="radio" name="gender" value="m" onclick="reset_msg();" />Male
<br />
<input type="radio" name="gender" value="f" onclick="reset_msg();" />Female
<br />
<div id="msg"></div>
<input type="submit" value="send>>" onclick="return send();" />
</form>
</body>
</html>
Regards,
问候，
Fernando
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