Getting selected options with querySelectorAll

问题:

I wonder if it's possible in Javascript to get the currently selected options in a <select multiple> field using the Selctors API rather than a "stupid" iteration over all options.

select.querySelectorAll('option[selected="selected"]') only returns the options that were marked as preselected in the original HTML, which is not what I'm looking for. Any ideas?

回答1:

document.querySelectorAll('option:checked')

Works even on IE9 ;)

回答2:

I was also experienced your issue, I have a feeling it's to do with JavaScript not recognising changes in the DOM.

Here is a solution:

jsFiddle

document.getElementById('test').onclick = function () {
    var select = document.getElementById('select');
    var options = getSelectedOptions(select);
    console.log(options);
};

function getSelectedOptions(select) {
    var result = [];
    var options = select.getElementsByTagName('option');
    for (var i = 0; i < options.length; i++) {
        if (options[i].selected)
            result.push(options[i]);
    };
    return result;
}