How to count checked checkbox with Javascript?

Question

I would like to count the checkboxes that are checked and display the count in the Div.

Here is my HTML :

<form name="liste_figurine" method="post">

<input type="checkbox" id="radio-1" class="z" name="chck1[]" onclick="updateCount()" />
<input type="checkbox" id="radio-2" class="z" name="chck2[]" onclick="updateCount()" />

</form>

<div id="y"></div>

Here is my JS :

function updateCount {
    var x = $(".z:checked").length;
    document.getElementById("y").innerHTML = x;
};

Here is an exemple : https://jsfiddle.net/r3todbs6/3/

Sorry, I'm not really used to JS... What is wrong with my code ?

Finally, it's working but I have one last issue : the onclick must contain 2 functions and I don't manage to make them working together.

Now this function works, alone : onclick="updateCount()"

This other function works also, alone : onclick="document.getElementById(\'radio-'.$ligne['id'].'-2\‌').c‌hecked = false"

But these two functions doesn't work, together : onclick="updateCount(); fx2(document.getElementById(\'radio-'.$ligne['id'].'-1\').ch‌ecked = false);"

What is wrong with the third proposition ? Is it a syntax error ?

You may use .forEach(value => { }) to check value of checkbox and count it s amount under condition — Jakub Chlebowicz
– Jakub Chlebowicz, Commented Mar 30, 2017 at 0:03
OK, I corrected this. By the way, do I have the obligation to use jquery, as I see you edited my post ? — Guillaume
– Guillaume, Commented Mar 30, 2017 at 0:03
The pure JavaScript way is document.querySelectorAll(".z:checked").length — castletheperson
– castletheperson, Commented Mar 30, 2017 at 0:07

kangsu · Accepted Answer · 2017-03-30 00:12:59Z

2

window.updateCount = function() {
    var x = $(".z:checked").length;
    document.getElementById("y").innerHTML = x;
};

https://jsfiddle.net/73yfczcj/

try this. you have to use jquery in javascript setting.

answered Mar 30, 2017 at 0:12

kangsu

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4 Comments

Guillaume Over a year ago

Thank you. I'm trying to put this in my original code but I have already something in the onclick event. How can I have two functions in it ?

Abhijeet Ahuja Over a year ago

onclick="fxn1(); fxn2();"

kangsu Over a year ago

@Guillaume you can call two functions in onclick event. onclick="updateCount(); someFunction();"

Guillaume Over a year ago

@kangsu : I have this already (in an echo) : onclick="document.getElementById(\'radio-'.$ligne['id'].'-2\').checked = false". So I tried this but it doesn't work : onclick="updateCount(); fxn2(document.getElementById(\'radio-'.$ligne['id'].'-2\').checked = false);"

Robert I · Accepted Answer · 2017-03-30 00:05:15Z

0

Use length

function updateCount(){
    var x = $("input:checked").length;
    $("#y").html(x);
};

answered Mar 30, 2017 at 0:05

Robert I

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1 Comment

Guillaume Over a year ago

Thanks for your answer. Is there something more to do ? It doesn't work.

Abhijeet Ahuja · Accepted Answer · 2017-03-30 00:11:47Z

0

function updateCount {
    var x = document.querySelector('.z:checked').length;
    document.getElementById("y").innerHTML = x;
};

try this fuction if you don't want to use jQuery

answered Mar 30, 2017 at 0:11

Abhijeet Ahuja

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2 Comments

Guillaume Over a year ago

Thank you. I'm trying to put this in my original code but I have already something in the onclick event. How can I have two functions in it ?

Abhijeet Ahuja Over a year ago

onclick="fxn1(); fxn2();"

X. Liu · Accepted Answer · 2017-03-30 00:21:02Z

0

There are three issues for your Fiddle code:

As others have mentioned, it should be length, not size().
You should change the JavaScript setting -> Load type to "No wrap - in <head>". Otherwise, updateCount is not defined in global scope.
You need to configure Fiddle to use jQuery if you use your original code.

A working example: https://jsfiddle.net/c5ez4w7y/

edited Mar 30, 2017 at 0:21

answered Mar 30, 2017 at 0:11

X. Liu

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Comments

waldalvajr · Accepted Answer · 2017-03-30 03:25:59Z

The answer provided by kangsu is the best answer but here is how I did it.

var form = document.getElementById('form');
var checkBoxes = $(form).children('.checkbox');
var count = 0;

var divBoxesChecked = document.getElementById('boxesChecked');
divBoxesChecked.innerHTML = 0;

$(checkBoxes).on('click', function() {
  $.each(checkBoxes, function(i) {
    if (checkBoxes[i].checked) {
      count++;
    }
  });
  console.log(count);
  divBoxesChecked.innerHTML = count;
  count = 0;
});

<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<form id="form" method="post">

  <input type="checkbox" id="box_01" class="checkbox" name="box_01" />
  <label>Box 1</label>

  <input type="checkbox" id="box_02" class="checkbox" name="box_02" />
  <label>Box 2</label>

  <input type="checkbox" id="box_03" class="checkbox" name="box_03" />
  <label>Box 3</label>

</form>

<div id="boxesChecked"></div>

Basically, every time one of the boxes is clicked it counts how many boxes are checked in total and prints that out to the div and the console, then it resets the counter to zero since it re-counts all of the checked boxes every time you click on one.

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