jQuery单选按钮“被选中”代码答案

【问题标题】：jQuery Radio Button "is selected" codejQuery单选按钮“被选中”代码
【发布时间】：2012-03-04 16:00:06
【问题描述】：

我正在编写一个程序来检查是否选择了单选按钮。我所拥有的是一个好的开始，但我可以使用一点帮助来完全实现这种类型的单选按钮代码。 div 还没有完全切换。

<?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>

【问题讨论】：

标签： jquery button radio

【解决方案1】：

尝试使用：

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

【讨论】：

【解决方案2】：

$("selector").is(':checked') 返回一个布尔值。所以你可以这样做：

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

【讨论】：

== true 在if 语句中是多余的。另外，您应该使用===anyway。
是的。不过，在向仍在学习的人解释时，Makes 会更清楚一些。我自己不会包含 == true :-) 为什么 ===？
严格类型检查 -- devguru.com/technologies/ecmascript/quickref/…

【解决方案3】：

尝试将您的 if 条件更改为

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

而不是

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

【讨论】：

【解决方案4】：

<?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>

【讨论】：

【解决方案5】：

我遍历了一组输入元素（this）并构建了一个字符串，然后我用它来获取“名称”的值（用于表单输入）

这是我发现获取单选按钮中单击的值的唯一方法。当然，表单发布也会做同样的事情，但我实际上无法提交。

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

【讨论】：