jQuery单选按钮“被选中”代码

问题描述：

我正在编写一个程序来检查是否选中单选按钮。我拥有的是一个好的开始，但我可以使用一点帮助完全实现这种类型的单选按钮代码。这个div还没有完全翻转。jQuery单选按钮“被选中”代码

<?php 
?> 
<!DOCTYPE html> 
<html> 
<head> 
<title>My Title</title> 
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js"></script> 
<script> 
$(document).ready(function(){ 
$('#enteraddress').toggle(); 
$('#entercoords').toggle(); 
//$('#enteraddress').click(function() { $('#enteraddress').hide(); }); 
    if ($('#byaddress:checked').val() == 'true') {   
     $('#enteraddress').toggle(); 
    } 
}); 
</script> 
</head> 
<body> 
<div style='border: solid 1px black; margin-bottom: 10px;' id="legaldisclaimer"> 
<h1>Legal Disclaimer:</h1> 
<p>Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal. 
Now we are engaged in a great civil war, testing whether that nation, or any nation so conceived and so dedicated, can long endure. We are met on a great battle-field of that war. 
We have come to dedicate a portion of that field, as a final resting place for those who here gave their lives that that nation might live. 
It is altogether fitting and proper that we should do this.But, in a larger sense, we can not dedicate -- we can not consecrate -- we can not hallow -- this ground. 
The brave men, living and dead, who struggled here, have consecrated it, far above our poor power to add or detract. 
The world will little note, nor long remember what we say here, but it can never forget what they did here. 
It is for us the living, rather, to be dedicated here to the unfinished work which they who fought here have thus far so nobly advanced. 
It is rather for us to be here dedicated to the great task remaining before us -- 
that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion -- 
that we here highly resolve that these dead shall not have died in vain -- that this nation, under God, shall have a new birth of freedom -- 
and that government of the people, by the people, for the people, shall not perish from the earth.</p> 
</body> 
</div> 
<div style='border: solid 1px black; margin-bottom: 10px;' id="locationoptions"> 
<h3>How would you like to enter your location data?</h3> 
<input type="radio" name="locationradios" id="byaddress">By physichal address?</input></br> 
<input type="radio" name="locationradios" id="bylatlng">By latitude and longitude?</input> 
</div> 
<div style='border: solid 1px black; margin-bottom: 10px;' id="enteraddress"> 
<h3>Radio 1</h3> 
</div> 
<div style='border: solid 1px black;' id="entercoords"> 
<h3>Radio 2</h3> 
</div> 
</div> 
</html>

答

尝试使用：

$("input").is(':checked')

答

试着改变你的，如果条件为

if($("input[type='radio']:checked").attr('id') == "byaddress"){ 
    $('#enteraddress').toggle(); 
}

，而不是

if ($('#byaddress:checked').val() == 'true') {   
     $('#enteraddress').toggle(); 
    }

答

$("selector").is(':checked')返回布尔。所以，你可以这样做：

if ($("#byaddress").is(':checked') == true) { 
    ... 
}

'==真'是'if'语句中多余的。另外，你应该使用'==='。 – switz 2012-02-13 16:30:11

是的。当向一个仍在学习的人解释时，做得更清楚一些。我不会包含==真实的自己:-) 为什么===？ – Flater 2012-02-14 10:50:35

严格类型检查 - http://www.devguru.com/technologies/ecmascript/quickref/comparison_operators.html – switz 2012-02-14 22:18:52

答

<?php 
?> 
<!DOCTYPE html> 
<html> 
<head> 
<title>My Title</title> 
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js"></script> 
<script> 
$(document).ready(function(){ 

$('#enteraddress').hide(); 
$('#entercoords').hide(); 
$('#theyellow').hide(); 

$("#radio01").click(function() { 
if ($(this).is(':checked')) { $('#enteraddress').show(); $('#theyellow').show(); $('#entercoords').hide(); } 
}); 

$("#radio02").click(function() { 
if ($(this).is(':checked')) { $('#entercoords').show(); $('#theyellow').show(); $('#enteraddress').hide(); } 
}); 

}); 
</script> 
</head> 
<body> 
<form name="mymapgetter" action="action.php"> 
<div style='border: solid 1px black; margin-bottom: 10px;' id="legaldisclaimer"> 
<h1>Legal Disclaimer:</h1> 
<p>Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal. 
Now we are engaged in a great civil war, testing whether that nation, or any nation so conceived and so dedicated, can long endure. We are met on a great battle-field of that war. 
We have come to dedicate a portion of that field, as a final resting place for those who here gave their lives that that nation might live. 
It is altogether fitting and proper that we should do this.But, in a larger sense, we can not dedicate -- we can not consecrate -- we can not hallow -- this ground. 
The brave men, living and dead, who struggled here, have consecrated it, far above our poor power to add or detract. 
The world will little note, nor long remember what we say here, but it can never forget what they did here. 
It is for us the living, rather, to be dedicated here to the unfinished work which they who fought here have thus far so nobly advanced. 
It is rather for us to be here dedicated to the great task remaining before us -- 
that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion -- 
that we here highly resolve that these dead shall not have died in vain -- that this nation, under God, shall have a new birth of freedom -- 
and that government of the people, by the people, for the people, shall not perish from the earth.</p> 
</body> 
</div> 
<div style='border: solid 1px black; margin-bottom: 10px;' id="locationoptions"> 
<h3>How would you like to enter your location data?</h3> 
<input type="radio" name="radio" value="" id="radio01">By physichal address?</input></br> 
<input type="radio" name="radio" value="" id="radio02">By latitude and longitude?</input> 
</div> 
<div style='border: solid 1px black; margin-bottom: 10px;' id="enteraddress"> 
<h3>Enter your physichal address:</h3></br> 
<input type="text" name="theaddress" value="" style="width: 100%;"></input> 
</div> 
<div style='border: solid 1px black;' id="entercoords"> 
<h3>Enter your latitude and longitude:</h3> 
<input type="text" name="thelat" value=""><- Lat.</input><input type="text" name="thelng" value=""><- Lng.</input> 
</div> 
<input type="submit" id="theyellow" value="getmap" style="width: 100%"></input> 
</form> 
</html>

答

我通过一组输入元素（本）的循环，并建立了一个字符串，然后我用得到的“名”的值（表单输入）

这是我发现获得点击单选按钮的价值的唯一方法。当然，表单帖子会做同样的事情，但我实际上无法完成提交。

var findit = "input:radio[name=" + $(this).attr("name") + "]:checked"; 
console.log($(findit).val());

jQuery单选按钮“被选中”代码

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