How To Check If Checkbox Is Checked In Jquery

by

When working with forms in web development, it is often necessary to determine if a checkbox is checked or not. This information can be used to conditionally perform certain tasks based on the user’s input. In this blog post, we will learn how to check if a checkbox is checked using jQuery.

Prerequisites

Before we proceed, make sure that you include the jQuery library in your HTML file. You can either download the library and host it on your server or use a CDN (Content Delivery Network) to include it. Here’s how to include it through Google’s CDN: 

        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>

Using the :checked Selector

The easiest way to check if a checkbox is checked using jQuery is by using the :checked selector. This selector returns all the checked elements, and you can check the length of the returned object to determine if a checkbox is checked or not. Let’s see an example: 

        <!-- HTML -->
        <input type="checkbox" id="myCheckbox" />

        <!-- jQuery -->
        <script>
            if ($("#myCheckbox:checked").length > 0) {
                console.log("Checkbox is checked");
            } else {
                console.log("Checkbox is not checked");
            }
        </script>

In the example above, we used the jQuery selector with the :checked pseudo-class to target the input with the id of myCheckbox. We then checked the length of the returned object, and if it is greater than 0, it means that the checkbox is checked.

Using the .prop() Method

Another way to determine if a checkbox is checked in jQuery is by using the .prop() method. This method retrieves the value of the specified property for the first element in the set of matched elements. In this case, we’ll retrieve the “checked” property. Here’s how to do it: 

        <!-- HTML -->
        <input type="checkbox" id="myCheckbox" />

        <!-- jQuery -->
        <script>
            if ($("#myCheckbox").prop("checked")) {
                console.log("Checkbox is checked");
            } else {
                console.log("Checkbox is not checked");
            }
        </script>

In the example above, we used the .prop() method to retrieve the “checked” property of the input with the id of myCheckbox. If the property value is true, it means that the checkbox is checked, otherwise it is not checked.

Conclusion

In this blog post, we learned two different methods to check if a checkbox is checked using jQuery: the :checked selector and the .prop() method. Both methods are easy to use and provide a quick way to determine the state of a checkbox in your web form.