Catch checked change event of a checkbox
JqueryUncheckedJquery Problem Overview
How do I to catch check/uncheck event of <input type="checkbox" /> with jQuery?
Jquery Solutions
Solution 1 - Jquery
<input type="checkbox" id="something" />
$("#something").click( function(){
if( $(this).is(':checked') ) alert("checked");
});
Edit: Doing this will not catch when the checkbox changes for other reasons than a click, like using the keyboard. To avoid this problem, listen to changeinstead of click.
For checking/unchecking programmatically, take a look at https://stackoverflow.com/questions/4869981/why-isnt-my-checkbox-change-event-triggered
Solution 2 - Jquery
The click will affect a label if we have one attached to the input checkbox?
I think that is better to use the .change() function
<input type="checkbox" id="something" />
$("#something").change( function(){
alert("state changed");
});
Solution 3 - Jquery
Use the :checked selector to determine the checkbox's state:
$('input[type=checkbox]').click(function() {
if($(this).is(':checked')) {
...
} else {
...
}
});
Solution 4 - Jquery
For JQuery 1.7+ use:
$('input[type=checkbox]').on('change', function() {
...
});
Solution 5 - Jquery
This code does what your need:
<input type="checkbox" id="check" >check it</input>
$("#check").change( function(){
if( $(this).is(':checked') ) {
alert("checked");
}else{
alert("unchecked");
}
});
Also, you can check it on jsfiddle
Solution 6 - Jquery
Use below code snippet to achieve this.:
$('#checkAll').click(function(){
$("#checkboxes input").attr('checked','checked');
});
$('#UncheckAll').click(function(){
$("#checkboxes input").attr('checked',false);
});
Or you can do the same with single check box:
$('#checkAll').click(function(e) {
if($('#checkAll').attr('checked') == 'checked') {
$("#checkboxes input").attr('checked','checked');
$('#checkAll').val('off');
} else {
$("#checkboxes input").attr('checked', false);
$('#checkAll').val('on');
}
});
For demo: http://jsfiddle.net/creativegala/hTtxe/
Solution 7 - Jquery
In my experience, I've had to leverage the event's currentTarget:
$("#dingus").click( function (event) {
if ($(event.currentTarget).is(':checked')) {
//checkbox is checked
}
});
Solution 8 - Jquery
use the click event for best compatibility with MSIE
$(document).ready(function() {
$("input[type=checkbox]").click(function() {
alert("state changed");
});
});
Solution 9 - Jquery
$(document).ready(function(){
checkUncheckAll("#select_all","[name='check_boxes[]']");
});
var NUM_BOXES = 10;
// last checkbox the user clicked
var last = -1;
function check(event) {
// in IE, the event object is a property of the window object
// in Mozilla, event object is passed to event handlers as a parameter
event = event || window.event;
var num = parseInt(/box\[(\d+)\]/.exec(this.name)[1]);
if (event.shiftKey && last != -1) {
var di = num > last ? 1 : -1;
for (var i = last; i != num; i += di)
document.forms.boxes['box[' + i + ']'].checked = true;
}
last = num;
}
function init() {
for (var i = 0; i < NUM_BOXES; i++)
document.forms.boxes['box[' + i + ']'].onclick = check;
}
HTML:
<body onload="init()">
<form name="boxes">
<input name="box[0]" type="checkbox">
<input name="box[1]" type="checkbox">
<input name="box[2]" type="checkbox">
<input name="box[3]" type="checkbox">
<input name="box[4]" type="checkbox">
<input name="box[5]" type="checkbox">
<input name="box[6]" type="checkbox">
<input name="box[7]" type="checkbox">
<input name="box[8]" type="checkbox">
<input name="box[9]" type="checkbox">
</form>
</body>