JavaScript: Check all checkboxes in table rows

checkAll.js

/*
 * Check all table rows when header checkbox is checked.
 * Also add a class to the table row for highlighting.
 */

// Set initial header checkbox state to false
var checkallEnabled = false;

// When checkbox in table header is clicked...
$("#check_all").click(function() {

	// Toggle the state of all checkboxes
	$(":checkbox").attr("checked", !checkallEnabled);

	// OPTIONAL: Set the table row class for checked rows
	if ($(":checkbox").attr("checked")) {
		$("tbody>tr").addClass("highlight");
	}
	else {
		$("tbody>tr").removeClass("highlight");
	}

	// Set the header checkbox state after each click
	checkallEnabled = !checkallEnabled;
});