check if option in a select dropdown is available

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I have a dropdown menu that outputs a option list. In some cases the backend script outputs no options for the select tag.

I want to run a js/jquery that checks for the existence of option tags. If option tag available do nothing If no option tag available开发者_C百科 run function X.

Cheers

if ( $("#select_id option").length == 0 ) {
    function()
}

You can use length to count the number of elements matched by a selector. In this case, write a selector that matches any of the <option> tags inside your select:

if ($('select.my_select option').length > 0) {
  // There are options inside <select class="my_select">
}

$("select").each(function(){
    if(this.childNodes.length > 0)
        process();
});