[英]How to show and hide div elements based on the selection of bootstrap dropdown in jQuery
[英]How to show and hide div elements based on the selection of radio buttons in jQuery
我想基于radio
按钮show
和hide
div。 我有这些代码,找不到任何地方出错了吗?
<!DOCTYPE html>
<html lang="en">
<head>
<script>
$(document).ready(function() {
$('input[type="radio"]').click(function() {
if ($(this).attr("value") == "student") {
$(".studentq").show();
}
});
});
</script>
</head>
<body>
<label name="Q2">I am a:</label>
<input type="radio" name="A2" value="student">Student
<input type="radio" name="A2" value="parent">Parent
<div class="studentq">
<label name="Q3">If Student, High School Graduation Year:</label>
<select name="A3">
<option disabled selected> -- select an option -- </option>
<option value=<?php echo $beforeyear2;?>>
<?php echo $beforeyear2;?>
</option>
<option value=<?php echo $beforeyear1;?>>
<?php echo $beforeyear1;?>
</option>
<option value="Other">Other</option>
</select>
</div>
</body>
</html>
当我加载页面时,虽然div class = "studentq"
不应显示,因为该值为空,但仍会显示,并且单击单选按钮不起作用。
有人可以帮忙吗?
非常感谢!
谢谢chayasan!
我这样更改它:
<!DOCTYPE html>
<html lang="en">
<head>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script>
$(document).ready(function() {
$(".studentq").hide();
$('input[type="radio"]').click(function() {
if ($(this).attr("value") == "student") {
$(".studentq").show();
}
});
});
</script>
</head>
<body>
<label name = "Q2" >I am a:</label>
<input type = "radio" name = "A2" value = "student" >Student
<input type = "radio" name = "A2" value = "parent" >Parent
<div class ="studentq">
<label name = "Q3" >If Student, High School Graduation Year:</label>
<select name = "A3" >
<option disabled selected> -- select an option -- </option>
<option value ="1">2014</option>
<option value ="2">2015</option>
<option value ="Other" >Other</option>
</select>
</div>
</body>
</html>
现在可以使用了!!!
页面加载时,您应该隐藏.studentq
元素。
$(".studentq").hide(); $('input[type="radio"]').click(function() { if ($(this).attr("value") == "student") { $(".studentq").show(); } else { $(".studentq").hide(); } });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script> <label name="Q2">I am a:</label> <input type="radio" name="A2" value="student">Student <input type="radio" name="A2" value="parent">Parent <div class="studentq"> <label name="Q3">If Student, High School Graduation Year:</label> <select name="A3"> <option disabled selected>-- select an option --</option> <option value="1"></option> <option value="2"></option> <option value="Other">Other</option> </select>
我建议以下内容:
// selecting the <input> elements of type=radio,
// and binding the anonymous function to handle
// the change event:
$('input[type=radio]').on('change', function() {
// caching the reference to the changed <input>:
var check = this;
// selecting the elements with the class of
// 'parentOrStudent' and hiding them all;
// using the filter() method:
$('.parentOrStudent').hide().filter(function() {
// to keep only those elements for whom the following is true,
// the checkbox is checked and the .parentOrStudent element
// contains the value ('parent' or 'student') in its classList:
return check.checked && this.classList.contains(check.value);
// we show only those elements retained in the collection:
}).show();
// we then trigger the change event to fire the function
// on page load:
}).change();
$('input[type=radio]').on('change', function() { var check = this; $('.parentOrStudent').hide().filter(function() { return check.checked && this.classList.contains(check.value); }).show(); }).change();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script> <fieldset> <legend>I am a:</legend> <label> <input type="radio" name="A2" value="student" />Student</label> <label> <input type="radio" name="A2" value="parent" />Parent</label> </fieldset> <fieldset class="parentOrStudent student"> <legend>If Student, High School Graduation Year:</legend> <select id="A3"> <option disabled selected>-- select an option --</option> <option value="1"></option> <option value="2"></option> <option value="Other">Other</option> </select> </fieldset> <fieldset class="parentOrStudent parent"> <legend>If parent, some other pertinent question:</legend> <select id="A4"> <option disabled selected>-- select an option --</option> <option value="1"></option> <option value="2"></option> <option value="Other">Other</option> </select> </fieldset>
外部JS Fiddle演示 ,用于实验。
顺便提及,要使用普通的JavaScript,以下内容将适用(尽管我已经修改了<input>
元素的HTML,以使用自定义data-refersto
属性指定<input>
元素应在哪些元素上工作:
// creating a named function to handle the events:
function toggleElements() {
// caching the changed <input> element:
var check = this,
// caching the elements that should be affected, by
// concatenating a '.' with the value held in the
// changed-element's 'data-refersto' attribute:
refersTo = document.querySelectorAll('.' + check.dataset.refersto);
// if we retrieved any elements in the 'refersTo' variable:
if (refersTo && refersTo.length) {
// we use Array.prototype.forEach() to iterate over
// the collection, and use Function.prototype.call()
// to use the Array-like collection (refersTo) with
// an Array method:
Array.prototype.forEach.call(refersTo, function(node) {
// if the changed element is checked, and
// the current refersTo node (here referred to
// as 'node') contains a class equal to the value
// of the changed element:
if (check.checked && node.classList.contains(check.value)) {
// we set the display to 'block' (to show):
node.style.display = 'block';
} else {
// otherwise we set the display to 'none' (to hide):
node.style.display = 'none';
}
});
}
}
// we use document.querySelectorAll() to retrieve all <input>
// elements of type=radio with a 'date-refersto' attribute:
var radioInputs = document.querySelectorAll('input[type=radio][data-refersto]'),
// creating a new Event, in order that we can trigger the
// 'change' event:
changeEvent = new Event('change');
// iterating over the found <input> elements (as above):
Array.prototype.forEach.call(radioInputs, function(input) {
// adding an event-listener for the 'change' event,
// assigning the toggleElements() function to
// handle this event:
input.addEventListener('change', toggleElements);
// triggering the 'change' event on page-load:
input.dispatchEvent(changeEvent);
});
function toggleElements() { var check = this, refersTo = document.querySelectorAll('.' + check.dataset.refersto); if (refersTo && refersTo.length) { Array.prototype.forEach.call(refersTo, function(node) { if (check.checked && node.classList.contains(check.value)) { node.style.display = 'block'; } else { node.style.display = 'none'; } }); } } var radioInputs = document.querySelectorAll('input[type=radio][data-refersto]'), changeEvent = new Event('change'); Array.prototype.forEach.call(radioInputs, function(input) { input.addEventListener('change', toggleElements); input.dispatchEvent(changeEvent); });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script> <fieldset> <legend>I am a:</legend> <label> <input type="radio" name="A2" value="student" data-refersto="parentOrStudent" />Student</label> <label> <input type="radio" name="A2" value="parent" data-refersto="parentOrStudent" />Parent</label> </fieldset> <fieldset class="parentOrStudent student"> <legend>If Student, High School Graduation Year:</legend> <select id="A3"> <option disabled selected>-- select an option --</option> <option value="1"></option> <option value="2"></option> <option value="Other">Other</option> </select> </fieldset> <fieldset class="parentOrStudent parent"> <legend>If parent, some other pertinent question:</legend> <select id="A4"> <option disabled selected>-- select an option --</option> <option value="1"></option> <option value="2"></option> <option value="Other">Other</option> </select> </fieldset>
外部JS Fiddle演示 ,用于实验。
参考文献:
可以使用“ Id”属性代替使用“ name”属性,然后可以轻松获取选中的单选按钮的值。 {
<input type="radio" id="rdStudent" value="student" name="A2"/>
<input type="radio" id="rdParent" value="parent" name="A2"/>
然后按如下所示修改您的jquery:
$(document).ready(function(){
(".studentq").hide();
$("#rdStudent").click(function(){
if("#rdStudent").val()=="student")
{
$(".studentq").show();
}
else{
$(".studentq").hide();
}
});
});
同样,您也可以检查第二个单选按钮。
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