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How to control check element from jquery dropdown button

I've used this jQuery dropdown button. This is my fiddle. This is the step of this:
So, the functionality:
At the time of selecting one option, a new box will appearing containing the title of that option. For example, if you click on the "Low" on the dropdown, a new box will come containing text, "Low" with a cross button.
I've written the script like this:
$('.low-option input[type=checkbox]').change(function(){
if($(this).prop('checked')){
$('#low-box').show();
} else {
$('#low-box').hide();
}
});
If you remove the boxes by clicking cross button, the box will be removed and adjacent checkbox will be unchecked.
So, I wrote this:
$('.option-box').on('click', '.cross', function() {
$(this).parent().remove();
});
if($('#low-box').is(":hidden")) {
$('.low-option input[type=checkbox]').prop('checked', false);
}
div.option-content is hidden at first. If any div.option-box will be visible, div.option-content will be visible too. If there is no div.option-box visible, div.option-content will be hidden always.
To do this, I wrote this:
var count = $('.option-content .option-box').is(":visible").length;
if (count > 0){
$('.option-content').show();
} else{
$('.option-content').hide();
}
But, my script is not working properly. As, I am not very good at jQuery, I can't find the reason and can't make it right way. Can you please help me removing the problem in the script?

Here I rewrite your code so it will become more scalable.. The important part that you missed is to relate/connect the checkbox with your option-box, so it will be easier for you to hide or show related element.. Check out this working Fiddle.
$('.dropdown-menu input[type=checkbox]').change(function(){
if($(this).prop('checked')){
$('.option-content').show();
$('.option-content #'+$(this).prop('id')).show();
} else {
$('.option-content #'+$(this).prop('id')).hide();
if($('.option-content .option-box:visible').length == 0){
$('.option-content').hide();
}
}
});
$('.option-box').on('click', '.cross', function() {
$('.dropdown-menu #'+$(this).parent().prop('id')).prop('checked', false);
$(this).parent().remove()
if($('.option-content .option-box:visible').length == 0){
$('.option-content').hide();
}
});
Cheers..

Clearing/Un-selecting Radio button on second click

I have a LOT of radio buttons on a form I'm creating.
The reason why I am using radio buttons and not check box's is because I only want to let a user select one or none.
The bad thing about a radio button though is, once selected, it can't be undone. I am trying to add the feature of clearing a group of radio box's when it's clicked for the second time.
My method that I am implementing now works if I have a group of radio buttons I want to target individually but not if I want to implement it for ALL radio button groups on the page.
When I use multiple radio button groups, it will randomly un-select a radio button when I try to select a different option.
If anyone could help me out, it would be greatly appreciated.
JSFIDDLE for only one group of radio buttons (works)
If you change to this code instead and target an individual name, it works.
$('input[name="rad"]').click(function()
JSFIDDLE for multiple groups of radio buttons (doesn't work)
I am trying to be able to target all my radio button groups at once, because there are a LOT.
$(function(){
$('input[type="radio"]').click(function(){
var $radio = $(this);
// if this was previously checked
if ($radio.data('waschecked') == true)
{
$radio.prop('checked', false);
$radio.data('waschecked', false);
}
else
$radio.data('waschecked', true);
// remove was checked from other radios
$radio.siblings('input[name="rad"]').data('waschecked', false);
});
});

So you just need a way to check/uncheck reliably by name groups.
Something like this should work:
$('input[type="radio"]').on('click change', function () {//on click/change
$(this).prop('checked')//if checked
? $(this).prop('checked',false).data('waschecked', false)//uncheck
: $(this).prop('checked',true).data('waschecked', true)//else check
.siblings('input[name="'+$(this).prop('name')+'"]').data('waschecked', false);//make siblings false
});
kept the .data('waschecked', ...) in case you needed to have that value, but it works without it like this:
$('input[type="radio"]').on('click change', function () {//on click/change
$(this).prop('checked')//if checked
? $(this).prop('checked',false)//uncheck
: $(this).prop('checked',true);//else check
});
made a fiddle: http://jsfiddle.net/filever10/ZUb65/

Try changing the line to use the name attribute of the clicked radio in the selector expression
$radio.siblings('input[name='+ $(this).attr('name') +']').data('waschecked', false);
You just need to clear your "waschecked" flag on the other radios of the same group.
http://jsfiddle.net/jammykam/BtLxY/15/
And just in case you do need to target using onchange: http://jsfiddle.net/jammykam/BtLxY/27/
$('input[type="radio"]').on('change', function(){
var $radio = $(this);
// if this was previously checked
if ($radio.data('waschecked') == true)
{
$radio.prop('checked', false);
$radio.data('waschecked', false);
}
else
$radio.data('waschecked', true);
// remove was checked from other radios
$radio.siblings('input[name='+ $(this).attr('name') +']').data('waschecked', false);
});

If you are using a simple primary to secondary relationship then try this out:
$('input[type="radio"][name="main_radios"]').on('change', function(){
$('input[type="radio"][name="secondary_radios"]').prop('checked', false);
$('input[type="radio"][name="third_radios"]').prop('checked', false);
$('input[type="radio"][name="fourth_radios"]').prop('checked', false);
// combine it all into one call if you really feel like it
$('input[type="radio"][name="secondary_radios"], input[type="radio"][name="third_radios"], input[type="radio"][name="fourth_radios"]').prop('checked', false);
});
Uncheck all radios that are not "this" name
// Listen for ANY radio to be changed
$('input[type="radio"]').on('change', function(){
// remember name of selected radio
var checked_name = $(this).attr('name');
// target only radios that are not "this" name and uncheck them
$('input[type="radio"]').filter(function(){
if($(this).attr('name') != checked_name){
return true;
}
else{
return false;
}
}).prop('checked', false);
});

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');
}
});

Check/Uncheck all checkboxes

I've seen many check/uncheck all checkboxes scripts. But far most does not respect that if I toggled all checkboxes using the "checked all"-checkbox and then uncheck a single one in the list, the "checked all" checkbox is still checked.
Is there an elegant way of handling this case?

$('#checkAll').click(function() {
if(this.checked) {
$('input:checkbox').attr('checked', true);
}
else {
$('input:checkbox').removeAttr('checked');
}
});
$('input:checkbox:not(#checkAll)').click(function() {
if(!this.checked) {
$('#checkAll').removeAttr('checked');
}
else {
var numChecked = $('input:checkbox:checked:not(#checkAll)').length;
var numTotal = $('input:checkbox:not(#checkAll)').length;
if(numTotal == numChecked) {
$('#checkAll').attr('checked', true);
}
}
});
Demo: http://jsfiddle.net/ThiefMaster/HuM4Q/
As pointed out in the question's comment, a regular checkbox is not perfect for this. My implementation disables the "check all" box as soon as one checkbox is unchecked. So, to uncheck all still-checked checkboxes you'll have to click twice (first to re-check the unchecked ones and then to uncheck all other ones).
However, with a tri-state checkbox this might still be necessary as the state order might be unchecked->indefinite->checked->unchecked, so you'd need two clicks to come from indefinite to unchecked.
Since you probably don't want to check ALL checkboxes on your page with "Check All", replace input:checkbox with e.g. .autoCheckBox or input.autoCheckBox:checkbox and give those checkboxes class="autoCheckBox".
If you want all checkboxes inside a certain form, simple use #idOfYourForm input:checkbox or form[name=nameOfYourForm] input:checkbox

You can achieve this by attaching a click handler to each of the target checkboxes, and have that handler un-check the "control" checkbox based on the collective state of those target checkboxes. So, something like this:
// Control checks/unchecks targets
$('#controlcheckbox').click( function(){
$('.targetcheckboxes').attr('checked', this.checked );
});
// Targets affect control
$('.targetcheckboxes').click( function(){
if( $('.targetcheckboxes:not(:checked)').length ){
$('#controlcheckbox').attr('checked',false);
}
});
Even better -- you could attach this logic to an enclosing container element, and watch for the event using .delegate():
$('#some_container').delegate('.targetcheckboxes','click',function(){...} );

$("#selectall").click(function(){
var checked = $("#selectall").attr("checked");
$(".selectone").attr("checked",checked);
});
For setting select all
$(".selectone").click(function(){
var net = $(".selectone").map(function(){ return jQuery(this).attr("checked");}).get();
var flg = true;
if(jQuery.inArray(false, net)){
flg= false;
}
$("#selectall").attr("checked",flg);
});

Perhaps something like this:
$('tbody input:checkbox').change(function(){
if ($(this).closest('tbody').find('input:checkbox').not(':checked').length) {
$('#checkAll')[0].checked = false;
}
});
This assumes that #checkAll is in the thead section of your table.

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/