js select unchecked checkbox code example

Example 1: jquery set checkbox checked unchecked

//jQuery 1.6+ use
$('.checkbox').prop('checked', true);  //false for uncheck
//jQuery 1.5.x and below use
$('.checkbox').attr('checked', true);  //false for uncheck

Example 2: checked unchecked through js

document.getElementById("checkbox_id").checked;
//If checked returns true;
//else returns false;