In jQuery, how do I select an element by its name attribute? - javascript

I have 3 radio buttons in my web page, like below:
<label for="theme-grey">
<input type="radio" id="theme-grey" name="theme" value="grey" />Grey</label>
<label for="theme-pink">
<input type="radio" id="theme-pink" name="theme" value="pink" />Pink</label>
<label for="theme-green">
<input type="radio" id="theme-green" name="theme" value="green" />Green</label>
In jQuery, I want to get the value of the selected radio button when any of these three are clicked. In jQuery we have id (#) and class (.) selectors, but what if I want to find a radio button by its name, as below?
$("<radiobutton name attribute>").click(function(){});
Please tell me how to solve this problem.

This should do it, all of this is in the documentation, which has a very similar example to this:
$("input[type='radio'][name='theme']").click(function() {
var value = $(this).val();
});
I should also note you have multiple identical IDs in that snippet. This is invalid HTML. Use classes to group set of elements, not IDs, as they should be unique.

To determine which radio button is checked, try this:
$('input:radio[name=theme]').click(function() {
var val = $('input:radio[name=theme]:checked').val();
});
The event will be caught for all of the radio buttons in the group and the value of the selected button will be placed in val.
Update: After posting I decided that Paolo's answer above is better, since it uses one less DOM traversal. I am letting this answer stand since it shows how to get the selected element in a way that is cross-browser compatible.

$('input:radio[name=theme]:checked').val();

another way
$('input:radio[name=theme]').filter(":checked").val()

This works great for me. For example you have two radio buttons with the same "name", and you just wanted to get the value of the checked one. You may try this one.
$valueOfTheCheckedRadio = $('[name=radioName]:checked').val();

The following code is used to get the selected radio button value by name
jQuery("input:radio[name=theme]:checked").val();
Thanks
Adnan

For anyone who doesn't want to include a library to do something really simple:
document.querySelector('[name="theme"]:checked').value;
jsfiddle
For a performance overview of the current answers check here

I found this question as I was researching an error after I upgraded from 1.7.2 of jQuery to 1.8.2. I'm adding my answer because there has been a change in jQuery 1.8 and higher that changes how this question is answered now.
With jQuery 1.8 they have deprecated the pseudo-selectors like :radio, :checkbox, :text.
To do the above now just replace the :radio with [type=radio].
So your answer now becomes for all versions of jQuery 1.8 and above:
$("input[type=radio][name=theme]").click(function() {
var value = $(this).val();
});
You can read about the change on the 1.8 readme and the ticket specific for this change as well as a understand why on the :radio selector page under the Additional Information section.

If you'd like to know the value of the default selected radio button before a click event, try this:
alert($("input:radio:checked").val());

You can use filter function if you have more than one radio group on the page, as below
$('input[type=radio]').change(function(){
var value = $(this).filter(':checked' ).val();
alert(value);
});
Here is fiddle url
http://jsfiddle.net/h6ye7/67/

<input type="radio" name="ans3" value="help">
<input type="radio" name="ans3" value="help1">
<input type="radio" name="ans3" value="help2">
<input type="radio" name="ans2" value="test">
<input type="radio" name="ans2" value="test1">
<input type="radio" name="ans2" value="test2">
<script type="text/javascript">
var ans3 = jq("input[name='ans3']:checked").val()
var ans2 = jq("input[name='ans2']:checked").val()
</script>

If you want a true/false value, use this:
$("input:radio[name=theme]").is(":checked")

Something like this maybe?
$("input:radio[name=theme]").click(function() {
...
});
When you click on any radio button, I believe it will end up selected, so this is going to be called for the selected radio button.

I you have more than one group of radio buttons on the same page you can also try this to get the value of radio button:
$("input:radio[type=radio]").click(function() {
var value = $(this).val();
alert(value);
});
Cheers!

can also use a CSS class to define the range of radio buttons and then use the following to determine the value
$('.radio_check:checked').val()

This worked for me..
HTML:
<input type="radio" class="radioClass" name="radioName" value="1" />Test<br/>
<input type="radio" class="radioClass" name="radioName" value="2" />Practice<br/>
<input type="radio" class="radioClass" name="radioName" value="3" />Both<br/>
Jquery:
$(".radioClass").each(function() {
if($(this).is(':checked'))
alert($(this).val());
});
Hope it helps..

$('input:radio[name=theme]').bind(
'click',
function(){
$(this).val();
});

You might notice using class selector to get value of ASP.NET RadioButton controls is always empty and here is the reason.
You create RadioButton control in ASP.NET as below:
<asp:RadioButton runat="server" ID="rbSingle" GroupName="Type" CssClass="radios" Text="Single" />
<asp:RadioButton runat="server" ID="rbDouble" GroupName="Type" CssClass="radios" Text="Double" />
<asp:RadioButton runat="server" ID="rbTriple" GroupName="Type" CssClass="radios" Text="Triple" />
And ASP.NET renders following HTML for your RadioButton
<span class="radios"><input id="Content_rbSingle" type="radio" name="ctl00$Content$Type" value="rbSingle" /><label for="Content_rbSingle">Single</label></span>
<span class="radios"><input id="Content_rbDouble" type="radio" name="ctl00$Content$Type" value="rbDouble" /><label for="Content_rbDouble">Double</label></span>
<span class="radios"><input id="Content_rbTriple" type="radio" name="ctl00$Content$Type" value="rbTriple" /><label for="Content_rbTriple">Triple</label></span>
For ASP.NET we don't want to use RadioButton control name or id because they can change for any reason out of user's hand (change in container name, form name, usercontrol name, ...) as you can see in code above.
The only remaining feasible way to get the value of the RadioButton using jQuery is using css class as mentioned in this answer to a totally unrelated question as following
$('span.radios input:radio').click(function() {
var value = $(this).val();
});

Related

How change event work on radio buttons

the change function catch only if radio is checked but not when its unchecked. Why? Should it behave like that? When I click the radio button the other is unchanging so the event should fire, right? Below is the code and jsfiddle. Do I do anything wrong?
HTML:
Option1 <input type="radio" name="choice" id="op1" checked/>
Option2 <input type="radio" name="choice" id="op2"/>
<br><br>
<span id="sp1">Option1</span><br>
<span id="sp2" style="display: none;">Option2</span>
Javascript:
var op2 = $('#op2');
var sp1 = $('#sp1');
var sp2 = $('#sp2');
op2.change(function(){
if(op2.is(':checked')){
sp1.hide();
sp2.show();
}
else{
sp2.hide();
sp1.show();
}
});
You can run your event handler when either checkbox changes:
$('#op2, #op1').change(...
Here's a demo: http://jsfiddle.net/TCt82/
Another way to select this would be by element name since both checkboxes need to have the same name attribute. Selecting by ID will be faster (although you won't be able to see the difference).
UPADTE
If anyone knows the exact reason the change event does not fire on a checkbox after it's been de-selected, posting it as a comment or answer would be great.
Change your selector to get it using the name
$("input[name='choice']").change(function(){
if(op2.is(':checked')){
sp1.hide();
sp2.show();
}
else{
sp2.hide();
sp1.show();
}
});
Working sample http://jsbin.com/UPILuCe/1

Two Checkboxes Being Checked at the Same Time

I have two checkboxes. What I need is when someone checks one of the boxes, it will automatically check the other one as well. And vice versa, if someone unchecks one of the boxes, it unchecks both. This is a bundle package on the form and they can not get one without the other.
<input type="checkbox" id="chk1" name="chk1" value="100">Voicemail<br />
<input type="checkbox" id="chk2" name="chk2" value="50">VM Support
Any help is greatly appreciated!
Why not this?
<input type="checkbox" id="chk1" name="chk1" value="100">
<label for="chk1">Voicemail and VM Support</label>
Assuming you want to only test these two checkboxes (and not every one on the page), you can use a jQuery Multiple Selector to access the onClick event for both. Using this you can test the checked status of the checkbox that was just clicked, and then assign that status of both checkboxes to match the one that was just clicked.
$('#chk1, #chk2').on('click', function(){
var checked = $(this).is(':checked');
$('#chk1, #chk2').attr('checked', checked);
});
Try this
$('#chk1 , #chk2').on('click', function(){
$('#chk1 , #chk2').attr('checked', $(this).is(':checked'))
});
FIDDLE
FIDDLE

validate field in javascript and jquery

I have four radio buttons. If I select the last radio button then one textbox is appearing. I handled this scenario by jquery. Now I want to validate in such a way that if user gets this textbox means if user checked the last radio button, then he should provide some text.But in my case, if I check any one of the radio button, its telling to provide some text. The code is like:
<input type="radio" name="bus_plan" id="smallBtn" value="1" />1
<input type="radio" name="bus_plan" id="smallBtn" value="2" />2
<input type="radio" name="bus_plan" id="smallBtn" value="3" />3
<input type="radio" name="bus_plan" id="smallBtn" value="Promotional" />
<span class="plantxt"><a style="cursor:pointer;" onclick="popup('popUpDiv')">Promotional Plan</a> (Please enter a promotional code)</span>
<div class="reg-line" id="pr_code_id" style="display:none">
<div class="reg-linea" align="left">Promotional Code: <sup>*</sup></div>
<input type="text" name="bus_prcode" id="bus_prcode" class="reg-line-input" value="Promotional Code" onblur="if(this.value=='') this.value='Promotional Code'" onClick="if(this.value==this.defaultValue) this.value='';" />
<br />
<div>
<div id="promotionalbox" style="display:none;font-size:13px;clear:both"></div>
</div>
</div>
<script type="text/javascript" src="js/jquery-1.7.2.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("input:radio[name=bus_plan]").click(function(){
var values = $(this).val();
if(values == 'Promotional'){
$('#pr_code_id').show();
}else{
$('#pr_code_id').hide();
}
});
});
</script>
and in js if I alert the value of document.getElementById('bus_prcode').value then always it is showing Promotional code, which is only for last radio button value.
Your code is a bit of a mess which is the root of this problem. Remember, one element per ID.
You may also find it helpful to look at jQuery .is(), for example:
$('input[value="Promotional"]').is(':checked')
n.b. I do not suggest the above, you should use identifiers in the appropriate way first.
Also worth noting that your code works fine for me using Chrome. See an example (which I have expanded for you) here: http://jsbin.com/ofujal/3/
You should not have an element with the same ID (your radio buttons). Also, you're getting the textbox by running document.getElementById('bus_prcode') and not the radio button. You should give a unique ID to your last radio button, e.g. btnPromotional, then bind click to it:
$("#btnPromotional").click(...)

getting class attribute of radio button in IE

I need to get the class attribute of checked radio button, with name="radio".
Used the code that's working fine in Firefox, but fails in IE.
val = $('input:radio[name=radio]:checked').attr('class');
How can i accomplish this?
There is no psuedo-class :radio. I think you meant [type=radio].
As comments says, I think you should use type instead of name. But i think you have named your input as radio because you can find this specific input. If you just use type selector you will catch every single selected radio input on page.
<input type="radio" name="radio" class="ey" /> Male<br />
So, if your page have more forms, you should specify a parent or form to avoid conflicts. Set a id for your form and try to find it by form id and radio type like this:
<form id="myForm">
<input type="radio" name="radio" class="ey" /> Male<br />
</form>
val = $("#myform input[type='radio']:checked").attr('class');
I hope it can help you :)

.checked=true not working with jquery $ function

i want to select a checkbox when a button is clicked.
<form action="" method="post" id="form2">
<input type="checkbox" id="checkone" value="one" name="one" />
<input type="button" value="Click me" id="buttonone"/>
</form>
when i tried the following, the checkbox was not getting selected
$('#buttonone').click(function() {
$('#checkone').checked=true;
});
then i tried:
$('#buttonone').click(function() {
document.getElementById('checkone').checked=true;
});
this time the checkbox got selected. why isn't it getting selected with the jquery $ function?
Try
$('#checkone').attr('checked', true);
or
$('#checkone').get(0).checked = true;
or
$('#checkone')[0].checked = true; // identical to second example
The reason your first code didn't work is because you were trying to set the checked property on a jQuery object which will have no visible effect as it only works on the native DOM object.
By calling get(0) or accessing the first item [0], we retrieve the native DOM element and can use it normally as in your second example. Alternatively, set the checked attribute using jQuery's attr function which should work too.
You need to use .attr() for the jQuery object, like this:
$('#buttonone').click(function() {
$('#checkone').attr('checked', true);
});
But it's better to do it the DOM way, like this:
$('#buttonone').click(function() {
$('#checkone')[0].checked = true; //get the DOM element, .checked is on that
});
Or, completely without jQuery:
document.getElementById('buttonone').onclick = function() {
document.getElementById('checkone').checked = true;
};
None of these answers worked for me because I incorrectly had multiple radios with the same name attributes:
<div id="group-one">
<input type="radio" name="groups" value="1" checked="checked" />
<input type="radio" name="groups" value="2" />
</div>
<div id="group-two">
<input type="radio" name="groups" value="1" checked="checked" />
<input type="radio" name="groups" value="2" />
</div>
Javascript won't recognize the checked attribute (obviously). This was a result of using include to add a similar section of HTML multiple times. Obviously, clicking on a radio button will uncheck the radio toggles with the same name.
Here's a jsfiddle to show that two radio elements can have the attribute checked but only the last one is actually checked:
http://jsfiddle.net/bozdoz/5ecq8/
Again, pretty obvious, but possibly something to watch out for: remove id and name attributes from files that you intend to include into other files multiple times.
Try
$('#checkone').attr('checked', true);
You don't have direct access to DOM object properties because jQuery operates on collections ($(selector) is an array). That's why you have functions defined to manipulate the contents of the returned elements.
try
$('#checkone').attr('checked', true);
cleary googling for "jquery check a checkbox" was the way to go
Or you could simply do
$('#buttonone').click(function() {
$('#checkone')[0].checked=true;
});
It is because ".checked" is not part of jQuery and you are trying to use it on a jQuery object. If you index a jQuery object at [0] you get the raw Javascript object which ".checked" exists on.
More here: http://phrappe.com/javascript/convert-a-jquery-object-to-raw-dom-object/
try this
$('#buttonone').click(function() {
$('#checkone').prop('checked', true);
});

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