How to call a function using checkbox in jQuery? - javascript

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";
});

Related

JS overides check in the checkbox on toggle [duplicate]

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");
}
})

Jquery: How to call a function on click

I have a check box called, On click of that check box I am calling a function below.
$('#checkbox-id').on('click', function(){
alert("clicked");
}).each(function(){this.checked = ace.settings.is('main-container', 'fixed')})
Same method I want to call from different function. First I need to check weather checkbox is checked or not after that I need to call function once checkbox is check for this I am using this code.
$(document).ready(function(){
if(document.getElementById('checkbox-id').checked){
$('#checkbox-id').click() // getting called but also unchecking checkbox it should not uncheck
}
});
This is working but it also unchecking checkbox which I don't want.
So How can I call that function without unchecking checkbox.
Here is JSFIDDLE to reproduce.
You can check If Check Box Is Checked Like :
$(document.body).on('change', '#chkID', function () {
if (this.checked) {
// CHECK BOX IS CHECKED
}
else {
// CHECK BOX IS NOT CHECKED
}
});
DEMO
Try declaring your function instead of using an anonymous function:
function handle_click() {
alert("clicked");
}
$('#checkbox-id').on('click', handle_click);
$(document).ready(function(){
if(document.getElementById('checkbox-id').checked){
handle_click();
}
});
you can use this ,this will fire the alert once the checkbox become checked
$('#checkbox-id').on('click', function () {
if ($(this).prop("checked") == true) {
alert("clicked");
}
});
Try trigger() instead:
$('#checkbox-id').trigger('click');
Only workaround not proper solution
$(document).ready(function(){
if(document.getElementById('checkbox-id').checked) {
$('#checkbox-id').click() // getting called but also unchecking checkbox should not uncheck
$('#checkbox-id').prop('checked', true);
}
});

Prevent click after focus event

When user clicks on input field, two consecutive events are being executed: focus and click.
focus always gets executed first and shows the notice. But click which runs immediately after focus hides the notice. I only have this problem when input field is not focused and both events get executed consecutively.
I'm looking for the clean solution which can help me to implement such functionality (without any timeouts or weird hacks).
HTML:
<label for="example">Example input: </label>
<input type="text" id="example" name="example" />
<p id="notice" class="hide">This text could show when focus, hide when blur and toggle show/hide when click.</p>
JavaScript:
$('#example').on('focus', _onFocus)
.on('blur', _onBlur)
.on('click', _onClick);
function _onFocus(e) {
console.log('focus');
e.preventDefault();
e.stopPropagation();
e.stopImmediatePropagation();
$('#notice').removeClass('hide');
}
function _onClick(e) {
console.log('click');
$('#notice').toggleClass('hide');
}
function _onBlur(e) {
console.log('blur');
$('#notice').addClass('hide');
}
UPDATED Fiddle is here:
I think you jumbled up the toggles. No need to prevent propagation and all that. Just check if the notice is already visible when click fires.
Demo: http://jsfiddle.net/3Bev4/13/
Code:
var $notice = $('#notice'); // cache the notice
function _onFocus(e) {
console.log('focus');
$notice.removeClass('hide'); // on focus show it
}
function _onClick(e) {
console.log('click');
if ($notice.is('hidden')) { // on click check if already visible
$notice.removeClass('hide'); // if not then show it
}
}
function _onBlur(e) {
console.log('blur');
$notice.addClass('hide'); // on blur hide it
}
Hope that helps.
Update: based on OP's clarification on click toggling:
Just cache the focus event in a state variable and then based on the state either show the notice or toggle the class.
Demo 2: http://jsfiddle.net/3Bev4/19/
Updated code:
var $notice = $('#notice'), isfocus = false;
function _onFocus(e) {
isFocus = true; // cache the state of focus
$notice.removeClass('hide');
}
function _onClick(e) {
if (isFocus) { // if focus was fired, show/hide based on visibility
if ($notice.is('hidden')) { $notice.removeClass('hide'); }
isFocus = false; // reset the cached state for future
} else {
$notice.toggleClass('hide'); // toggle if there is only click while focussed
}
}
Update 2: based on OP's observation on first click after tab focus:
On second thought, can you just bind the mousedown or mouseup instead of click? That will not fire the focus.
Demo 3: http://jsfiddle.net/3Bev4/24/
Updated code:
$('#example').on('focus', _onFocus)
.on('blur', _onBlur)
.on('mousedown', _onClick);
var $notice = $('#notice');
function _onFocus(e) { $notice.removeClass('hide'); }
function _onClick(e) { $notice.toggleClass('hide'); }
function _onBlur(e) { $notice.addClass('hide'); }
Does that work for you?
Setting a variable for "focus" seems to do the trick : http://jsfiddle.net/3Bev4/9/
Javascript:
$('#example').on('focus', _onFocus)
.on('click', _onClick)
.on('blur', _onBlur);
focus = false;
function _onFocus(e) {
console.log('focus');
$('#notice').removeClass('hide');
e.preventDefault();
e.stopPropagation();
e.stopImmediatePropagation();
focus = true;
}
function _onClick(e) {
console.log('click');
if (!focus) {
$('#notice').toggleClass('hide');
} else {
focus = false;
}
}
function _onBlur(e) {
console.log('blur');
$('#notice').addClass('hide');
}
If you want to hide the notice onBlur, surely it needs to be:
function _onBlur(e) {
console.log('blur');
$('#notice').addClass('hide'); // Add the hidden class, not remove it
}
When doing this in the fiddle, it seemed to fix it.
The code you have written is correct, except that you have to replae $('#notice').removeClass('hide'); with $('#notice').addClass('hide');
Because onBlur you want to hide so add hide class, instead you are removing the "hide" calss.
I hope this is what the mistake you have done.
Correct if I am wrong, Because I don't know JQuery much, I just know JavaScript.
you can use many jQuery methods rather than add or move class:
Update: add a params to deal with the click function
http://jsfiddle.net/3Bev4/23/
var showNotice = false;
$('#example').focus(function(){
$('#notice').show();
showNotice = true;
}).click(function(){
if(showNotice){
$('#notice').show();
showNotice = false;
}else{
showNotice = true;
$('#notice').hide();
}
}).blur(function(){
$('#notice').hide();
});

Give a condition to auto check the checkbox

is there a way to do in javascript such that if I check a few checkboxes as a condition, one of the checkbox will be check. Currently here's my logic for the codes but it cant work.
$(document).ready( function a()
{
if ( $('#condition1' && $('#condition2').is(':checked'))
{
$('#checkbox1').attr('checked', true);
}
});
Also, is it possible to put a class in the checkbox to do the check function instead of id?
You script is executed on document ready. After the execution is won't react to any action you take. In order to accomplish what you want, you need to run the script every time a check box is clicked.
$(document).ready( function(){
$('input[type="checkbox"]').click(function(){
if ( $('#condition1').is(':checked') && $('#condition2').is(':checked')){
$('#checkbox1').prop('checked', true);
}else{
$('#checkbox1').prop('checked', false);
}
});
});
http://jsfiddle.net/CaZ7j
Your need to use a change handler
jQuery(function ($) {
var $checks = $('#condition1, #condition2').change(function () {
$('#checkbox1').prop('checked', $checks.is(':checked'));
})
});
Demo: Fiddle

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')

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