In this tutorial we will see how to Count Checked Checkboxes of Specific Form with JQuery. The jQuery :checked Selector, .filter() method and .length property are used for this purpose.
Table of Contents
HTML Code
HTML Code is given below, This code contains three checkbox type input elements with three labels. HTML button is also there and click event is tied with this button using jQuery. On clicking this button a function will be executed which will count the number of checked checkboxes.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Count Checked Checkboxes of Specific Form with JQuery</title>
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
</head>
<body>
<form id="main">
<label>HTML</label>
<input type="checkbox" class='checkbox'>
<label>CSS</label>
<input type="checkbox" class='checkbox'>
<label>JAVASCRIPT</label>
<input type="checkbox" class='checkbox'>
</form>
<button>Count Checkboxes</button>
</body>
</html>
jQuery :checked Selector
The jQuery :checked Selector is used for checkboxes, select tag and radio buttons. In this example the :checked Selector is used for those checkboxes which are checked. All other checkboxes will be ignored.
jQuery filter() method
The jQuery filter() method return only those HTML elements that match the selector or pass the function test.
In this example jQuery filter() method will return only those checkboxes that are checked because we used :checked Selector in our filter method.
length Property
The length Property returns the number of elements in the jQuery object.
In this example the length Property will count the number of checked checkboxes.
JQuery Code
JQuery Code is given below, The code will only be executed once the document is ready. Once document is ready then the form with id 'main' is selected. Then checkboxes of this form are selected.
On button click using the click method of jQuery, a function is executed which will count the number of checked checkboxes. This number is then displayed using alert method.
The good thing about this code is that this will only count checked checkboxes of a specific html form (with id 'main' in this example) on current page, not all forms.
Take a look at the code given below.
<script>
$(document).ready(function(){
var form = $("#main");
var checkboxes = $("input:checkbox", form);
$("button").click(function(){
var x =checkboxes.filter(':checked').length;
alert(x);
});
});
</script>
Demo
Video Tutorial
Watch video tutorial on how to Count Checked Checkboxes of Specific Form with JQuery.