Check/Uncheck checkbox with JavaScript

Question

How can a checkbox be checked/unchecked using JavaScript?

Answer 1

Javascript:

// Check document.getElementById("checkbox").checked = true;  // Uncheck document.getElementById("checkbox").checked = false; 

jQuery (1.6+):

// Check $("#checkbox").prop("checked", true);  // Uncheck $("#checkbox").prop("checked", false); 

jQuery (1.5-):

// Check $("#checkbox").attr("checked", true);  // Uncheck $("#checkbox").attr("checked", false);