How to Check a jQuery Checkbox is Checked or Not?

if(document.getElementById('radio1').checked) { alert("Checked"); }

jQuery Checkbox

<input type="checkbox" id="radio1" checked />

You can use the jQuery prop() method to check or uncheck a checkbox dynamically such as on click of button or an hyperlink etc.

$("#radio1").prop("checked", true);

To check the current state of the checkbox you must instead use the checked property . It is dynamically updated as the user checks/unchecks.

if(document.getElementById('radio1').checked) { alert("Checked"); }

The above code returns true if checked, false if unchecked.

run this source code Browser View

Full Source
<!DOCTYPE html> <html> <head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script> $(document).ready(function() { $("#btn1").click(function() { if(document.getElementById('radio1').checked) { alert("Checked"); } else { alert("Unchecked"); } }); }); </script> </head> <body> <input type="checkbox" id="radio1" checked /> <br> <button id="btn1">Check It!</button> </body> </html>

jQuery prop() Method

The jQuery prop() method is used to retrieve the properties and their values for selected elements. When used to fetch the property value, it returns the value of the first matched element in the selection. If the property has not been set or if there are no matched elements, it returns undefined. This method is commonly used for reading and manipulating properties of HTML elements, such as checking the state of checkboxes or radio buttons.

Syntax
$(selector).prop(property)
example
if($('#radio1').prop('checked')) { alert("Checked"); }

The above code returns true if checked, false if unchecked.

run this source code Browser View

Full Source
<!DOCTYPE html> <html> <head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script> $(document).ready(function() { $("#btn1").click(function() { if($('#radio1').prop('checked')) { alert("Checked"); } else { alert("Unchecked"); } }); }); </script> </head> <body> <input type="checkbox" id="radio1" checked /> <br> <button id="btn1">Check It!</button> </body> </html>

jQuery prop() Vs. attr()

The .attr() method sometimes considered property values when retrieving attributes, which could lead to inconsistent behavior. Starting from jQuery 1.6, the .prop() method was introduced to explicitly retrieve property values, while the .attr() method is specifically used for retrieving attributes. This separation provides more consistent and reliable behavior when working with elements and their properties or attributes in jQuery.

jQuery is() method

The jQuery is() method is used to evaluate whether the elements within a matched set match a specified selector, element, or jQuery object. It returns true if at least one element in the set meets the specified criteria; otherwise, it returns false. This method performs a traversal through the DOM elements to determine if any of them satisfy the provided parameter, making it a valuable tool for element selection and filtering in jQuery.

Syntax
selector.is(filter)
example
if ($("input[type=checkbox]").is(":checked")) { alert("Checked"); }

The above code returns true if checked, false if unchecked.

run this source code Browser View

Full Source
<!DOCTYPE html> <html> <head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script> $(document).ready(function() { $("#btn1").click(function() { if ($("input[type=checkbox]").is(":checked")) { alert("Checked"); } else { alert("Unchecked"); } }); }); </script> </head> <body> <input type="checkbox" name="radio1" checked /> <br> <button id="btn1">Check It!</button> </body> </html>

Conclusion

To check whether a jQuery checkbox is checked or not, you can use the prop() method to examine its checked property. If the checkbox is checked, this property will return true; otherwise, it will return false. This allows you to programmatically determine the checkbox's state and take appropriate actions based on its checked status.






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