What is the correct way of getting the value of a selected drop down item using JavaScript?

I thought i knew this, and now I'm quite embarassed becuase I don't :-/

This JSFiddle demonstrates two ways of getting the value of a selected drop down item in JavaScript. Code reproduced here:

var obj = document.getElementById("test");
alert(obj.options[obj.selectedIndex].value);  //like this
alert(obj.value);  //or like this

Quirksmode suggests that s开发者_如何学Come older broswers don't support the latter (http://www.quirksmode.org/js/forms.html), and value isn't a supported attribute in the HTML 4.01 spec.

So I wondered, which is the correct standarised way of doing this?

Anyone?

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David is correct. If you want full compatibility you might want to use something like:

var options = document.getElementById('securityWalkInTime').children;
var value = [];
for (var i=0;i<options.length;i++) {
    var option = options[i];
    if (option.selected === true) {
        value.push(option.value ? option.value : option.text);
    }
}

This will definitely work, however, for all practical cases I would use the latter of your example.

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Both are standard. Use the version with better browser support.

value isn't a supported attribute in the HTML 4.01 spec

This is DOM, not HTML.