How to trigger checkbox click event even if it's checked through Javascript code?

Question

I have many checkboxes in my page and there is a select all checkbox which checks all the checkboxes. Somehow I want to emulate that click event of checkbox even if it's checked/unchecked through select all button. How can I do it?

Solution 1

You can use the jQuery .trigger() method. See http://api.jquery.com/trigger/

E.g.:

$('#foo').trigger('click');

Solution 2

Getting check status

var checked = $("#selectall").is(":checked");

Then for setting

$("input:checkbox").attr("checked",checked);

Solution 3

You can use .change() function too

E.g.:

$('form input[type=checkbox]').change(function() { console.log('hello') });

Solution 4

You can also use this, I hope you can serve them.

$(function(){
  $('#elements input[type="checkbox"]').prop("checked", true).trigger("change");
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>

<div id="elements">
  <input type="checkbox" id="item-1" value="1"> Item 1 <br />
  <input type="checkbox" id="item-2" value="2" disabled> Item 2 <br /> 
  <input type="checkbox" id="item-3" value="3" disabled> Item 3 <br />
  <input type="checkbox" id="item-4" value="4" disabled> Item 4 <br />
  <input type="checkbox" id="item-5" value="5"> Item 5
</div>

Solution 5

no gQuery

document.getElementById('your_box').onclick();

I used certain class on my checkboxes.

var x = document.getElementsByClassName("box_class");
var i;
for (i = 0; i < x.length; i++) {
    if(x[i].checked) x[i].checked = false;
    else x[i].checked = true;
    x[i].onclick();
   }

View more solutions

Comments

[Kevin Babcock]

You can also just call $('#foo').click(), which effectively does the same thing.

[EvilDr]

Not tried this with attr as I use prop nowadays, but this method only checks the boxes, it does not fire the click event for each afterwards

[Paul]

How to do this with pure JavaScript?

[rogerdpack]

appears trigger('click') toggles the current value. If you want to just set it then set checked to true then call triggerHandler(...) stackoverflow.com/questions/10268222/…

[Wancieho]

How exactly do posts like this get marked as correct when they require using a 3rd party? He did not ask for a jQuery solution.

[Mark Robinson]

@Wancieho The question is tagged 'jquery'.

[Yilmaz]

CAN U EXPLAIN YOUR CODE

[Flimm]

This does not work for me when the checkbox change is done through Javascript.

[mihca]

@Wancieho jQuery is javascript and it was not explicitly forbidden to use a 3rd party library solution. Hence the answer is a valid solution. Furthermore, jQuery is a very widespread library so many people with the same question will benefit from the answer. Finally, by pointing to a working solution the OP can dig deeper and check what jQuery is doing to come up with an own implementation.

[Wancieho]

@mihca firstly JavaScript !== jQuery. jQuery is a library written in JavaScript. Furthermore, I know it's widespread (yet fading away with the introduction of JS frameworks). I originally responded based on the fact that I didn't see the tag which Mark pointed out. I myself was looking for a pure JS solution for Angular and stumbled upon this question. To include jQuery to perform 1 operation is ludicrous but as I've said in this instance I missed the jQuery tag so the answer is valid.