How To Check If The Checkbox Is Checked Javascript

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Checking if a checkbox is checked seems like a simple task. However, there are a few ways to do this with Javascript. In this blog post, we will cover 3 different ways to check if checkbox is checked javascript.

Different methods to try out:

Method 1: Check the checked property of the checkbox

You can use the DOM method element checked to determine whether or not a certain checkbox is checked. The method returns true if the checkbox is checked and false otherwise.
var checkBox = document.querySelector(‘input[type=”checkbox”]’);console.log(checkBox.checked); //returns true or false based on the status of the box

Method 2: Check for the existence of the attribute ‘checked’

Another way to see if a box is checked is by seeing if the attribute ‘checked’ exists on the input element that represents the checkbox. This can be done using either vanilla Javascript or jQuery.
console.log(checkBox.hasAttribute(‘checked’)); //returns true or false based on existence of ‘checked’ attribute

Method 3: Check for content within the label associated with the checkbox

If you have a label associated with your checkbox, you can also look for content within that label to see its status. This is event handling and requires that you add an event listener for when the label is clicked on.

This code would go within your $(document).ready(function() {}); if using jQuery or within your window.onload = function() {} if using vanilla Javascript

var label = document.”yourLabelSelector”; //change selector to match label in your HTML code
label .addEventListener ( ‘click’ , function () {console . log ( $ ( this ). find ( “input” ). prop ( “checked” )); //will return true or false based on checking status of input within label})

The need to check if the checkbox is checked javascript

Checking whether a checkbox is checked using JavaScript is very simple. To do this, you need to create a reference to the checkbox and then use the checked property to see if it is checked. This property returns true if the checkbox is checked and false otherwise.

  • You can use this property to set the checked state of the checkbox, like this: checkbox.checked = true; // Check the box checkbox.checked = false; // Uncheck the box.
  • You can also use this property to toggle the checked state of the checkbox, like this: checkbox.checked = !checkbox.checked; // Toggle the state. This code will first check if the checkbox is checked and then toggle it based on that. If it’s checked, it will be unchecked, and vice versa.
  • You can also use the click() method to click on a checkbox, like this: checkbox programmatically.click(); // Click on the box. This will trigger a click event on the check box, which will toggle its state automatically.

Conclusion:

There are many times as a developer; you will need to know whether or not a checkbox is checked when building forms or such. These three methods will allow you as a developer to easily and quickly see if the said box has been checked using Javascript. Each method has its own benefits, so it is important for a developer to understand all three before implementing them into their own codebase.