为什么textarea.value返回“未定义”？ （使用本机Javascript）

Question

This is really simple but I just cant figure out what is Wrong.

I got a div , a textarea , a button .

I want to use "Native-Javascript" coz lately i have been using jQuery alot and I want to go Native on this basic thing.

The Aim is to get the contents of the enter code here textarea transfered to the div and have the same logged in the console on button 's click .

See my Codes:

Javascript:

function text_func (){
    var btn = document.getElementsByTagName('button'),
        div_out = document.getElementsByTagName('div');
        txt_a = document.getElementsByTagName('textarea');

    console.log(txt_a.value);// This Logs undefined :: WHY?

        //return;
        btn[0].addEventListener('click',btn_click,false);

        function btn_click(){

            console.log(txt_a.value)//  This also logs undefined.. Why again?
            div_out.innerHTML = txt_a.value;

            }

    }

window.onload = function(){

    text_func();    

    }

HTML:

<div id="myDiv" style="width:300px; border:1px solid #ccc; height:100px; padding:10px;"></div>

<textarea style="width:300px; border:1px solid #ccc; height:100px; padding:10px;"></textarea>

<button>Go</button>

What I'm I doing wrong?....

See Fiddle: http://jsfiddle.net/3urm9/ Any Suggestion is highly appreciated.

Answer 1

You can try:

console.log(txt_a[0].value)

Notice the [0]

Answer 2

getElementByTagName

That returns an array (actually a NodeList) of elements.
Arrays don't have a value property.

You probably want to get one of the elements from the array.