Question

How do I simplify the following code?

It is just a static ID.

<script>
    $x('input[id="id1"]').attr('checked', true);
    $x('input[id="idx4"]').attr('checked', true);
    $x('input[id="idk5"]').attr('checked', true);
</script>

Answer 1

Just use the ID selector. You can select multiple elements by separating by comma:

$x('#id1,#idx4,#idk5').attr('checked', true);

Or if you are using jQuery 1.6 (or later) you should be using .prop() to set checked property:

$x('#id1,#idx4,#idk5').prop('checked', true);