$('input:radio[name="postage"]').change(
function(){
if ($(this).is(':checked') && $(this).val() == 'Yes') {
// append goes here
}
});
或者,上面的 - 再次 - 使用一点less多余的 jQuery:
$('input:radio[name="postage"]').change(
function(){
if (this.checked && this.value == 'Yes') {
// note that, as per comments, the 'changed'
// <input> will *always* be checked, as the change
// event only fires on checking an <input>, not
// on un-checking it.
// append goes here
}
});
修订(改进了一些)jQuery:
// defines a div element with the text "You're appendin'!"
// assigns that div to the variable 'appended'
var appended = $('<div />').text("You're appendin'!");
// assigns the 'id' of "appended" to the 'appended' element
appended.id = 'appended';
// 1. selects '<input type="radio" />' elements with the 'name' attribute of 'postage'
// 2. assigns the onChange/onchange event handler
$('input:radio[name="postage"]').change(
function(){
// checks that the clicked radio button is the one of value 'Yes'
// the value of the element is the one that's checked (as noted by @shef in comments)
if ($(this).val() == 'Yes') {
// appends the 'appended' element to the 'body' tag
$(appended).appendTo('body');
}
else {
// if it's the 'No' button removes the 'appended' element.
$(appended).remove();
}
});
var appended = $('<div />').text("You're appendin'!");
appended.id = 'appended';
$('input:radio[name="postage"]').change(function() {
if ($(this).val() == 'Yes') {
$(appended).appendTo('body');
} else {
$(appended).remove();
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
<input type="radio" id="postageyes" name="postage" value="Yes" />Yes
<input type="radio" id="postageno" name="postage" value="No" />No
此外,还有一个温和的更新(因为我正在编辑以包含片段以及 JS Fiddle 链接),以便用
<input />
包裹 <label>
元素 - 允许单击文本来更新相关 <input />
- 并更改创建要附加的内容的方式:
var appended = $('<div />', {
'id': 'appended',
'text': 'Appended content'
});
$('input:radio[name="postage"]').change(function() {
if ($(this).val() == 'Yes') {
$(appended).appendTo('body');
} else {
$(appended).remove();
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<label>
<input type="radio" id="postageyes" name="postage" value="Yes" />Yes</label>
<label>
<input type="radio" id="postageno" name="postage" value="No" />No</label>
此外,如果您只需要根据用户检查的元素来显示内容,则可以进行轻微更新,使用显式显示/隐藏来切换可见性:
// caching a reference to the dependant/conditional content:
var conditionalContent = $('#conditional'),
// caching a reference to the group of inputs, since we're using that
// same group twice:
group = $('input[type=radio][name=postage]');
// binding the change event-handler:
group.change(function() {
// toggling the visibility of the conditionalContent, which will
// be shown if the assessment returns true and hidden otherwise:
conditionalContent.toggle(group.filter(':checked').val() === 'Yes');
// triggering the change event on the group, to appropriately show/hide
// the conditionalContent on page-load/DOM-ready:
}).change();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<label>
<input type="radio" id="postageyes" name="postage" value="Yes" />Yes</label>
<label>
<input type="radio" id="postageno" name="postage" value="No" />No</label>
<div id="conditional">
<p>This should only show when the 'Yes' radio <input> element is checked.</p>
</div>
最后,仅使用 CSS:
/* setting the default of the conditionally-displayed content
to hidden: */
#conditional {
display: none;
}
/* if the #postageyes element is checked then the general sibling of
that element, with the id of 'conditional', will be shown: */
#postageyes:checked ~ #conditional {
display: block;
}
<!-- note that the <input> elements are now not wrapped in the <label> elements,
in order that the #conditional element is a (subsequent) sibling of the radio
<input> elements: -->
<input type="radio" id="postageyes" name="postage" value="Yes" />
<label for="postageyes">Yes</label>
<input type="radio" id="postageno" name="postage" value="No" />
<label for="postageno">No</label>
<div id="conditional">
<p>This should only show when the 'Yes' radio <input> element is checked.</p>
</div>
参考资料:
:checked
选择器。~
)组合器。试试这个
if($("input:radio[name=postage]").is(":checked")){
//Code to append goes here
}
类似这样的:
if($('#postageyes').is(':checked')) {
// do stuff
}
if($('#test2').is(':checked')) {
$(this).append('stuff');
}
$('input:radio[name="postage"]').change(function(){
if($(this).val() === 'Yes'){
// append stuff
}
});
这将侦听单选按钮上的更改事件。当用户单击
Yes
时,该事件将触发,您将能够将您喜欢的任何内容附加到 DOM。
$("input").bind('click', function(e){
if ($(this).val() == 'Yes') {
$("body").append('whatever');
}
});
试试这个:
if ( jQuery('#postageyes').is(':checked') ){ ... }
这将监听更改的事件。我尝试过其他人的答案,但那些对我不起作用,最后,这个起作用了。
$('input:radio[name="postage"]').change(function(){
if($(this).is(":checked")){
alert("lksdahflk");
}
});
另一种实现可能是这个:
<h1>Display Radio Buttons</h1>
<form action="/action_page.php">
<p>Please select your favorite Web language:</p>
<!-- 1 -->
<input type="radio" id="html" name="fav_language" value="HTML" checked>
<label for="html">HTML</label><br>
<!-- 2 -->
<input type="radio" id="css" name="fav_language" value="CSS">
<label for="css">CSS</label><br>
<!-- 3 -->
<input type="radio" id="javascript" name="fav_language" value="JavaScript">
<label for="javascript">JavaScript</label>
<br>
<input type="submit" value="Submit">
</form>
记住:
name
:对单选按钮进行分组。id
:告诉每个单选按钮的状态。value
:这就是您将在提交时发布的内容。for
:允许您将给定标签关联到名为 id 的输入字段。记住这是代码前端。
在这里,您可以通过
type
选择所有按钮,然后根据您的选择进行任何操作。在本例中,我们将使用 HTML 元素的 value
部分:
$("[type='radio']").on('change', function (e) {
var selectedValue = $(this).val();
console.log(selectedValue); // So you can see it in the console.
if (selectedValue == 'HTML') {
// Do something.
}
else {
// Or do something else.
// Example:
// someOtherSelectedElement.prop("disabled", false);
}
});
向单选按钮添加尽可能多的
if
语句。
请记住,由于使用
value
字段,您可以设置任意数量的选项。
jQuery('input[name="inputName"]:checked').val()