Counting the number of option tags in a select tag in jQuery

user_138488 0
Viewed 252903

How do I count the number of <option>s in a <select> DOM element using jQuery?

<select data-attr="dropdown" id="input1">
  <option value="Male" id="Male">Male</option>
  <option value="Female" id="Female">Female</option>
</select>

I want to find the number of <option> tags in the <select> DOM element, since with that I want to open the settings panel with that number of input fields with the corresponding option value from the drop-down box in it and to change it again in the preview panel.

The above drop-down box is in my preview panel which is generated by jQuery.

html jquery javascript
9 Answers
$('#input1 option').length;

This will produce 2.

user_1191390

The W3C solution:

var len = document.getElementById("input1").length;
user_703930

Your question is a little confusing, but assuming you want to display the number of options in a panel:

<div id="preview"></div>

and

$(function() {
  $("#preview").text($("#input1 option").length + " items");
});

Not sure I understand the rest of your question.

cletus_183930

In a multi-select option box, you can use $('#input1 :selected').length; to get the number of selected options. This can be useful to disable buttons if a certain minimum number of options aren't met.

function refreshButtons () {
    if ($('#input :selected').length == 0)
    {
        $('#submit').attr ('disabled', 'disabled');
    }
    else
    {
        $('#submit').removeAttr ('disabled');
    }
}
user_3312970

This is giving the count of all the available options exactly as the question asked. Its useful if you already have the node in a variable

user_15878040
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