Web Reference: Note that setting the checked content attribute (as opposed to the IDL attribute set with Javascript) to a non-empty string, the checkbox is checked. So if you set the 'checked' content attribute to "false", the checkbox will be checked. Jul 12, 2025 · To check and uncheck the checkbox using JavaScript we can use the onclick event to toggle the checkbox value. We can also check or uncheck all the checkboxes on loading the webpage using JavaScript onload function. In this tutorial, you will read and learn about several JavaScript and jQuery methods for checking and unchecking a checkbox. Choose the best one for you.
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