JS overides check in the checkbox on toggle [duplicate] - javascript

I'm using Jquery's toggle event to do some stuff when a user clicks a checkbox, like this:
$('input#myId').toggle(
function(){
//do stuff
},
function(){
//do other stuff
}
);
The problem is that the checkbox isn't being ticked when I click on the checkbox. (All the stuff I've put into the toggle event is working properly.)
I've tried the following:
$('input#myId').attr('checked', 'checked');
and
$(this).attr('checked', 'checked');
and even simply
return true;
But nothing is working. Can anyone tell me where I'm going wrong?
Edit - thanks to all who replied. Dreas' answer very nearly worked for me, except for the part that checked the attribute. This works perfectly (although it's a bit hacky)
$('input#myInput').change(function ()
{
if(!$(this).hasClass("checked"))
{
//do stuff if the checkbox isn't checked
$(this).addClass("checked");
return;
}
//do stuff if the checkbox isn't checked
$(this).removeClass('checked');
});
Thanks again to all who replied.


Use the change event instead of the toggle event, like such:
$('input#myId').change(function () {
if ($(this).attr("checked")) {
//do the stuff that you would do when 'checked'
return;
}
//Here do the stuff you want to do when 'unchecked'
});


While using the change event handler suggested by Dreas Grech is appropriate, it doesn't work well in IE 6 & 7, which doesn't fire the change event until the focus is blurred (that is, until you click outside the area of the checkbox). As QuirksMode say, "it's a serious bug".
You might want to use the click event handler, but that won't work with keyboard navigation. You need to register a keyup handler too...
See also this related question.
I haven't yet found a good cross-browser solution that supports both mouse clicks and keyboard activation of the checkboxes (and doesn't fire too many events).
Regarding your solution for checking whether the checkbox is checked or not, instead of adding your own checked class, you may use HTML's checked attribute:
$('input#myInput').change(function () {
if ($(this).attr("checked")) {
//do stuff if the checkbox is checked
} else {
//do stuff if the checkbox isn't checked
}
});
Any browser sets the checked attribute of an input element to the value "checked" if the checkbox is checked, and sets it to null (or deletes the attribute) if the checkbox is not checked.


why not using $.is() ?
$('input#myId').change(
function() {
if ($(this).is(':checked')) {
// do stuff here
} else {
// do other stuff here
}
});


This is an answer by MorningZ (I found it here) that makes totally sense:
The part you are missing is that "checkbox" is a jQuery object, not a
checkbox DOM object
so:
checkbox.checked sure would error because there is no .checked property of a jQuery
object
so:
checkbox[0].checked would work since the first item on a jQuery array is the DOM object
itself.
So in your change() function you can use
$(this)[0].checked


$('input#myId').toggle(
function(e){
e.preventDefault();
//do stuff
$(this).attr('checked', 'true');
},
function(e){
e.preventDefault();
//do other stuff
$(this).attr('checked', 'false');
}
);


this worked for me............ check it
$(":checkbox").click(function(){
if($(this).attr("id").split("chk_all")[1])
{
var ty = "sel"+$(this).attr("id").split("chk_all")[1]+"[]";
if($(this).attr("checked"))
{
$('input[name="'+ty+'"]').attr("checked", "checked");
}
else
{
$('input[name="'+ty+'"]').removeAttr("checked");
}
}
})


I did a similar approach but simply using the checked attribute such as
//toggles checkbox on/off
$("input:checkbox").change(
function(){
if(!this.checked){
this.checked=true;
}
else{
this.checked=false;
}
}
);
//end toggle


$("input[type=checkbox][checked=false]")// be shure to set to false on ready
$("input#Checkbox1").change(function() {
if ($(this).attr("checked")) {
$("#chk1").html("you just selected me")//the lable
} else {$("#chk1").html("you just un selected me") }
});


Try using a non-jquery function:
function chkboxToggle() {
if ($('input#chkbox').attr('checked'))
// do something
else
// do something else
}
then in your form:
<input id="chkbox" type="checkbox" onclick="chkboxToggle()" />


Try:
$(":checkbox").click(function(){
if($(this).attr("checked"))
{
$('input[name="name[]"]').attr("checked", "checked");
}
else
{
$('input[name="name[]"]').removeAttr("checked");
}
})

Related

How to call a function using checkbox in jQuery?

I have a checkbox and want to call a function when I check the checkbox and also disable that function when I uncheck the checkbox. How do I do it?
Note: By disable I mean, it should revert the process done by that function.
Update:
Is there any way to directly disable the function that I called? Since it contains many other click events inside it. So I don't wanna turn those off individually. I just wanna disable that function so that those click events automatically goes off.

$('#checkbox').change(function() {
if($(this).is(":checked")) {
// do something if checked
}
else{
// do something if not checked
}
});

Listen to the change event.
$('input#your-input-id').change(function() {
if(this.checked) {
// call the function
}
else {
// call "undo" function
}
});

$('input[type="checkbox"]').on('change', function() {
if(this.checked) {
// process if checked
} else {
// revert process here
}
// example to set variable:
var myvar = this.checked ? "It is checked" : "not checked";
});

javascript/jquery: hide and uncheck, checked option/options [duplicate]

I'd like to do something like this to tick a checkbox using jQuery:
$(".myCheckBox").checked(true);
or
$(".myCheckBox").selected(true);
Does such a thing exist?

Modern jQuery
Use .prop():
$('.myCheckbox').prop('checked', true);
$('.myCheckbox').prop('checked', false);
DOM API
If you're working with just one element, you can always just access the underlying HTMLInputElement and modify its .checked property:
$('.myCheckbox')[0].checked = true;
$('.myCheckbox')[0].checked = false;
The benefit to using the .prop() and .attr() methods instead of this is that they will operate on all matched elements.
jQuery 1.5.x and below
The .prop() method is not available, so you need to use .attr().
$('.myCheckbox').attr('checked', true);
$('.myCheckbox').attr('checked', false);
Note that this is the approach used by jQuery's unit tests prior to version 1.6 and is preferable to using $('.myCheckbox').removeAttr('checked'); since the latter will, if the box was initially checked, change the behaviour of a call to .reset() on any form that contains it – a subtle but probably unwelcome behaviour change.
For more context, some incomplete discussion of the changes to the handling of the checked attribute/property in the transition from 1.5.x to 1.6 can be found in the version 1.6 release notes and the Attributes vs. Properties section of the .prop() documentation.

Use:
$(".myCheckbox").attr('checked', true); // Deprecated
$(".myCheckbox").prop('checked', true);
And if you want to check if a checkbox is checked or not:
$('.myCheckbox').is(':checked');

This is the correct way of checking and unchecking checkboxes with jQuery, as it is cross-platform standard, and will allow form reposts.
$('.myCheckBox').each(function(){ this.checked = true; });
$('.myCheckBox').each(function(){ this.checked = false; });
By doing this, you are using JavaScript standards for checking and unchecking checkboxes, so any browser that properly implements the "checked" property of the checkbox element will run this code flawlessly. This should be all major browsers, but I am unable to test previous to Internet Explorer 9.
The Problem (jQuery 1.6):
Once a user clicks on a checkbox, that checkbox stops responding to the "checked" attribute changes.
Here is an example of the checkbox attribute failing to do the job after someone has clicked the checkbox (this happens in Chrome).
Fiddle
The Solution:
By using JavaScript's "checked" property on the DOM elements, we are able to solve the problem directly, instead of trying to manipulate the DOM into doing what we want it to do.
Fiddle
This plugin will alter the checked property of any elements selected by jQuery, and successfully check and uncheck checkboxes under all circumstances. So, while this may seem like an over-bearing solution, it will make your site's user experience better, and help prevent user frustration.
(function( $ ) {
$.fn.checked = function(value) {
if(value === true || value === false) {
// Set the value of the checkbox
$(this).each(function(){ this.checked = value; });
}
else if(value === undefined || value === 'toggle') {
// Toggle the checkbox
$(this).each(function(){ this.checked = !this.checked; });
}
return this;
};
})( jQuery );
Alternatively, if you do not want to use a plugin, you can use the following code snippets:
// Check
$(':checkbox').prop('checked', true);
// Un-check
$(':checkbox').prop('checked', false);
// Toggle
$(':checkbox').prop('checked', function (i, value) {
return !value;
});

You can do
$('.myCheckbox').attr('checked',true) //Standards compliant
or
$("form #mycheckbox").attr('checked', true)
If you have custom code in the onclick event for the checkbox that you want to fire, use this one instead:
$("#mycheckbox").click();
You can uncheck by removing the attribute entirely:
$('.myCheckbox').removeAttr('checked')
You can check all checkboxes like this:
$(".myCheckbox").each(function(){
$("#mycheckbox").click()
});

You can also extend the $.fn object with new methods:
(function($) {
$.fn.extend({
check : function() {
return this.filter(":radio, :checkbox").attr("checked", true);
},
uncheck : function() {
return this.filter(":radio, :checkbox").removeAttr("checked");
}
});
}(jQuery));
Then you can just do:
$(":checkbox").check();
$(":checkbox").uncheck();
Or you may want to give them more unique names like mycheck() and myuncheck() in case you use some other library that uses those names.

$("#mycheckbox")[0].checked = true;
$("#mycheckbox").attr('checked', true);
$("#mycheckbox").click();
The last one will fire the click event for the checkbox, the others will not.
So if you have custom code in the onclick event for the checkbox that you want to fire, use the last one.

To check a checkbox you should use
$('.myCheckbox').attr('checked',true);
or
$('.myCheckbox').attr('checked','checked');
and to uncheck a check box you should always set it to false:
$('.myCheckbox').attr('checked',false);
If you do
$('.myCheckbox').removeAttr('checked')
it removes the attribute all together and therefore you will not be able to reset the form.
BAD DEMO jQuery 1.6. I think this is broken. For 1.6 I am going to make a new post on that.
NEW WORKING DEMO jQuery 1.5.2 works in Chrome.
Both demos use
$('#tc').click(function() {
if ( $('#myCheckbox').attr('checked')) {
$('#myCheckbox').attr('checked', false);
} else {
$('#myCheckbox').attr('checked', 'checked');
}
});

This selects elements that have the specified attribute with a value containing the given substring "ckbItem":
$('input[name *= ckbItem]').prop('checked', true);
It will select all elements that contain ckbItem in its name attribute.

Assuming that the question is...
How do I check a checkbox-set BY VALUE?
Remember that in a typical checkbox set, all input tags have the same name, they differ by the attribute value: there are no ID for each input of the set.
Xian's answer can be extended with a more specific selector, using the following line of code:
$("input.myclass[name='myname'][value='the_value']").prop("checked", true);

I'm missing the solution. I'll always use:
if ($('#myCheckBox:checked').val() !== undefined)
{
//Checked
}
else
{
//Not checked
}

To check a checkbox using jQuery 1.6 or higher just do this:
checkbox.prop('checked', true);
To uncheck, use:
checkbox.prop('checked', false);
Here' s what I like to use to toggle a checkbox using jQuery:
checkbox.prop('checked', !checkbox.prop('checked'));
If you're using jQuery 1.5 or lower:
checkbox.attr('checked', true);
To uncheck, use:
checkbox.attr('checked', false);

Here is a way to do it without jQuery
function addOrAttachListener(el, type, listener, useCapture) {
if (el.addEventListener) {
el.addEventListener(type, listener, useCapture);
} else if (el.attachEvent) {
el.attachEvent("on" + type, listener);
}
};
addOrAttachListener(window, "load", function() {
var cbElem = document.getElementById("cb");
var rcbElem = document.getElementById("rcb");
addOrAttachListener(cbElem, "click", function() {
rcbElem.checked = cbElem.checked;
}, false);
}, false);
<label>Click Me!
<input id="cb" type="checkbox" />
</label>
<label>Reflection:
<input id="rcb" type="checkbox" />
</label>

Here is code for checked and unchecked with a button:
var set=1;
var unset=0;
jQuery( function() {
$( '.checkAll' ).live('click', function() {
$( '.cb-element' ).each(function () {
if(set==1){ $( '.cb-element' ).attr('checked', true) unset=0; }
if(set==0){ $( '.cb-element' ).attr('checked', false); unset=1; }
});
set=unset;
});
});
Update: Here is the same code block using the newer Jquery 1.6+ prop method, which replaces attr:
var set=1;
var unset=0;
jQuery( function() {
$( '.checkAll' ).live('click', function() {
$( '.cb-element' ).each(function () {
if(set==1){ $( '.cb-element' ).prop('checked', true) unset=0; }
if(set==0){ $( '.cb-element' ).prop('checked', false); unset=1; }
});
set=unset;
});
});

Try this:
$('#checkboxid').get(0).checked = true; //For checking
$('#checkboxid').get(0).checked = false; //For unchecking

We can use elementObject with jQuery for getting the attribute checked:
$(objectElement).attr('checked');
We can use this for all jQuery versions without any error.
Update: Jquery 1.6+ has the new prop method which replaces attr, e.g.:
$(objectElement).prop('checked');

If you are using PhoneGap doing application development, and you have a value on the button that you want to show instantly, remember to do this
$('span.ui-[controlname]',$('[id]')).text("the value");
I found that without the span, the interface will not update no matter what you do.

Here is the code and demo for how to check multiple check boxes...
http://jsfiddle.net/tamilmani/z8TTt/
$("#check").on("click", function () {
var chk = document.getElementById('check').checked;
var arr = document.getElementsByTagName("input");
if (chk) {
for (var i in arr) {
if (arr[i].name == 'check') arr[i].checked = true;
}
} else {
for (var i in arr) {
if (arr[i].name == 'check') arr[i].checked = false;
}
}
});

Another possible solution:
var c = $("#checkboxid");
if (c.is(":checked")) {
$('#checkboxid').prop('checked', false);
} else {
$('#checkboxid').prop('checked', true);
}

As #livefree75 said:
jQuery 1.5.x and below
You can also extend the $.fn object with new methods:
(function($) {
$.fn.extend({
check : function() {
return this.filter(":radio, :checkbox").attr("checked", true);
},
uncheck : function() {
return this.filter(":radio, :checkbox").removeAttr("checked");
}
});
}(jQuery));
But in new versions of jQuery, we have to use something like this:
jQuery 1.6+
(function($) {
$.fn.extend({
check : function() {
return this.filter(":radio, :checkbox").prop("checked", true);
},
uncheck : function() {
return this.filter(":radio, :checkbox").prop("checked",false);
}
});
}(jQuery));
Then you can just do:
$(":checkbox").check();
$(":checkbox").uncheck();

If using mobile and you want the interface to update and show the checkbox as unchecked, use the following:
$("#checkbox1").prop('checked', false).checkboxradio("refresh");

For jQuery 1.6+
$('.myCheckbox').prop('checked', true);
$('.myCheckbox').prop('checked', false);
For jQuery 1.5.x and below
$('.myCheckbox').attr('checked', true);
$('.myCheckbox').attr('checked', false);
To check,
$('.myCheckbox').removeAttr('checked');

To check and uncheck
$('.myCheckbox').prop('checked', true);
$('.myCheckbox').prop('checked', false);

Be aware of memory leaks in Internet Explorer prior to Internet Explorer 9, as the jQuery documentation states:
In Internet Explorer prior to version 9, using .prop() to set a DOM
element property to anything other than a simple primitive value
(number, string, or boolean) can cause memory leaks if the property is
not removed (using .removeProp()) before the DOM element is removed
from the document. To safely set values on DOM objects without memory
leaks, use .data().

$('controlCheckBox').click(function(){
var temp = $(this).prop('checked');
$('controlledCheckBoxes').prop('checked', temp);
});

This is probably the shortest and easiest solution:
$(".myCheckBox")[0].checked = true;
or
$(".myCheckBox")[0].checked = false;
Even shorter would be:
$(".myCheckBox")[0].checked = !0;
$(".myCheckBox")[0].checked = !1;
Here is a jsFiddle as well.

Plain JavaScript is very simple and much less overhead:
var elements = document.getElementsByClassName('myCheckBox');
for(var i = 0; i < elements.length; i++)
{
elements[i].checked = true;
}
Example here

I couldn't get it working using:
$("#cb").prop('checked', 'true');
$("#cb").prop('checked', 'false');
Both true and false would check the checkbox. What worked for me was:
$("#cb").prop('checked', 'true'); // For checking
$("#cb").prop('checked', ''); // For unchecking

When you checked a checkbox like;
$('.className').attr('checked', 'checked')
it might not be enough. You should also call the function below;
$('.className').prop('checked', 'true')
Especially when you removed the checkbox checked attribute.

Here's the complete answer
using jQuery
I test it and it works 100% :D
// when the button (select_unit_button) is clicked it returns all the checed checkboxes values
$("#select_unit_button").on("click", function(e){
var arr = [];
$(':checkbox:checked').each(function(i){
arr[i] = $(this).val(); // u can get id or anything else
});
//console.log(arr); // u can test it using this in google chrome
});

In jQuery,
if($("#checkboxId").is(':checked')){
alert("Checked");
}
or
if($("#checkboxId").attr('checked')==true){
alert("Checked");
}
In JavaScript,
if (document.getElementById("checkboxID").checked){
alert("Checked");
}

Get state of checkbox using javascript

I'm trying to write a javascript with jquery which should be able to pick out and use information on if a checkbox is checked or not. This should happen every time the checkbox(has id 'edit-toggle-me') is clicked. I've written a test function for this with some alert() in it to see if I've succeeded or not.
(function ($) {
"use strict";
$(document).ready(function () {
$('#edit-toggle-me').click(function(){
if ($('#edit-toggle-me').checked()) {
alert('Yup!');
}
else {
alert('Nup!');
}
});
});
})(jQuery);
It perform neither of the alerts so I'm guessing it crashes at $('#edit-toggle-me').checked(). I don't know why though.
I've also tried this:
(function ($) {
$(document).ready(function () {
$('#edit-toggle-me').click(function(){
var elementy = document.getElementById('edit-toggle-me');
var check = elementy.value;
alert(check);
if(elementy.checked()) {
alert('yup');
}
});
});
})(jQuery);
The first alert works, but neither or the last two 'yup' or 'nup'.
And then I also tried this:
(function ($) {
$(document).ready(function () {
$('#edit-toggle-me').click(function(){
var element2 = document.getElementById('edit-toggle-me');
var check = element2.value;
alert(check);
});
});
})(jQuery);
This always return 1. Which I don't understand why either.
Grateful for any hints.

Use .is(':checked'). You can find the documentation HERE.
JSFIDDLE

There is no such method as .checked() in jQuery or in the DOM API. There is simply a .checked property on the element that is true if the element is checked, false otherwise. Try this:
(function ($) {
"use strict";
$(document).ready(function () {
$('#edit-toggle-me').click(function(){
alert( this.checked ? ":)" : ":(" );
});
});
})(jQuery);
See demo: http://jsfiddle.net/scZ3X/

$(function(){
$('#edit-toggle-me').on('change', function(){
if($(this).is(':checked')) {
alert('checked');
}
else {
alert('unchecked');
}
});
});
You should have to use �change� event instead click. Because In some cases click event is not good to use in check box and radio buttons.
Example 1:
If you have a radio button have click event bind. In case your radio button is already true and you clicking in radio button. It�s not change radio button value, But your click event fire every time.
But in case if you use change event. Your event will fire only if your radio button value got change(If it�s already not checked or true)
Example 2:
If you have any label for any radio button or check box. In case you have click event bind in checkbox or radio button. On click of your label your check box or radio button value got change but your click event will not call.
In case of change event. It�ll work as expected on click of label related label too.

Try this:
$('#edit-toggle-me').is(':checked')

How can I check if a checkbox is checked on click?

I need to trigger some code when I click a checkbox based on if a checkbox is checked or not.
But for some reason, .is(':checked') is always triggered.
This is my code.
jQuery('#selectlist input[type=checkbox]').live('click',function(){
var select_id = jQuery(this).attr('id');
if(jQuery(this).is(':checked')) {
alert('You have unchecked the checkbox');
// Remove some data from variable
} else {
alert('You have checked the checkbox');
//Add data to variable
}
}
UPDATE
I've added an example on JSFiddle: http://jsfiddle.net/HgQUS/

Use change instead of click

$(this).val();
or
$(this).prop('checked'); # on jquery >= 1.6
You will be better at searching over SO:
Get checkbox value in jQuery
How to retrieve checkboxes values in jQuery
Testing if a checkbox is checked with jQuery

this.checked
Should tell you if the checkbox is checked or not although this is just javascript so you won't be able to call it on a 'jquery' element. For example -
<input type="checkbox" id="checky">
$("#checky")[0].checked

If the input has the checked attribute, then it is obviously checked, it is removed if it is not checked.
if ($(this).attr("checked")) {
// return true
}
else {
// return false
}
However, you can adapt the above code to check if the attribute, if it is not removed and instead set to true/false, to the following:
if ($(this).attr("checked") == "true") {
// return true
}
else {
// return false
}
Additionally, I see you use jQuery as an operator for selectors, you can just use the dollar, $, symbol as that is a shortcut.

I flipped-flopped the alerts, and it works for me:
<script type="text/javascript">
jQuery('#selectlist input[type=checkbox]').live('click',function(){
var select_id = jQuery(this).attr('id');
if(jQuery(this).is(':checked')) {
alert('You have checked the checkbox');
// Remove some data from variable
} else {
alert('You have unchecked the checkbox');
//Add data to variable
}
});
</script>

Your "if" syntax is not correct.
jQuery('#selectlist_categories input[type=checkbox]').live('click',function(){
var cat_id = jQuery(this).attr('id');
// if the checkbox is not checked then alert "You have unchecked the checkbox"
if(!jQuery(this).is(':checked')) {
alert('You have unchecked the checkbox');
} else {
//else alert "You have checked the checkbox"
alert('You have checked the checkbox');
}
});

if you're confused about why it says unchecked when you check it. There is nothing wrong with your code you can just switch the unchecked and checked with each other in the alerts like this:
$('#selectlist_categories input[type=checkbox]').on('change',function(){
var cat_id = $(this).attr('id');
let cat_idText = $("input[type=checkbox]:checked").val();
if(jQuery(this).is(':checked')) {
alert('You have checked the checkbox' + " " + `${cat_idText}`);
} else {
alert('You have unchecked the checkbox');
}
});
PS: I have updated the script to work in jQuery 3.5.1 the original with the live() only works on jQuery 1.7 since it was removed in 1.9 to instead use on() and on jQuery 3.5.1 you can use $ instead of jQuery and the val() function works on all versions because it added in jQuery 1.0
Or in a nice better fashion correct the if statement as RickyCheers said adding the ! before jQuery or $ which then the if statement will turn it into a if jQuery Element is not checked
$('#selectlist_categories input[type=checkbox]').on('click',function(){
var cat_id = $(this).attr('id');
if(!jQuery(this).is(':checked')) {
alert('You have unchecked the checkbox');
} else {
alert('You have checked the checkbox');
}
});

jQuery checkbox click shows input field - doesn't work

I use a jQuery function to show certain hidden text fields once you select something from a select box.
This works fine for select boxes but I can't get it to work for a checkbox.
Here is the stripped code I tried (in a nutshell) but it's not working: http://jsbin.com/uwane3/2/
Thanks for your help, I rarely use JS so my knowledge is small.

I have found 2 errors in your code:
your Checkbox has no value so you cant get more than an empty result form ".val()"
you have not bind a eventhandler to the checkbox.
http://jsbin.com/uwane3/3
$('#cf3_field_9').live('click', function(e){
if (e.target == $('#cf3_field_9')[0] && e.target.checked) {
alert('The following line could only work if the checkbox have a value.');
$.viewMapcf3_field_9[$(this).val()].show();
} else {
$.each($.viewMapcf3_field_9, function() { this.hide(); });
}
});

You have no events registered to your checkbox.
Register a click, or change handler like this:
$('#cf3_field_9').click(function(){
if ($(this).attr("checked")) {
$.viewMapcf3_field_9[$(this).val()].show();
} else {
$.each($.viewMapcf3_field_9, function() { this.hide(); });
}
});
http://api.jquery.com/category/events/

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