Question

I have two html select objects named with the same name (they are arrays with different indexes).

What I am trying to do, is if “off” is selected from the category[0] select element, I would like to disable the category[1] element. I have been trying to use document.getElementsByName() but am having no luck figuring out how to specifically target the category[1] array. See below for example code.

<select name='category[0]'>
    <option value='0'>off</option>
    <option value='1'>on</option>
</select>

<select name='category[1]'></select>

My question is how can I modify the properties of an HTML object that is an array? I understand I could do this easily using ID’s but I would like to learn how to do this using an array.

Thanks

Answer 1

Untested:

<select name='category[0]'>
    <option value='0'>off</option>
    <option value='1'>on</option>
</select>

<select name='category[1]'></select>

<script>
var selects = document.getElementsByTagName('select');

for ( var i = 0, len = selects.length; i<l; ++i ) {
    if ( selects[i].name == 'category[1]' ) {
        // operate on selects[i];
        // you can also rely on getAttribute('name')
    }
}

</script>