如何使用JavaScript在textarea标记中提供输入？

Question

Have a textarea tag in form, to take input text and return the value of said text.

 <textarea id="code" name="code"></textarea>  

Using javascript to get the value, but it returns nothing. Used typeof to check if it's undefined , but typeof text gives 'string' . Is this correct way to use .value ? How to improve this?

JavaScript:

var text = document.getElementById('code').value;

document.getElementById('submit-button').onclick = function() {
    alert(text);
}; 

Answer 1

You're getting the value immediately when the page loads, before the user has had a chance to type anything. You want to get the value when the user clicks the button:

 document.getElementById('submit-button').onclick = function() { var text = document.getElementById('code').value; alert(text); }; 

 <textarea id="code" name="code"></textarea> <button type="button" id="submit-button">click me</button> 

Answer 2

You need to bind the event and get the value just when the user clicks the button.

Embrace the function addEventListener

 document.getElementById('submit-button').addEventListener('click', function() { var text = document.getElementById('code').value; console.log(text); }); 

 <textarea id="code" name="code"></textarea> <button type="button" id="submit-button">click me</button> 

Answer 3

Stick the var text line inside the click event; it's getting defined when the script runs originally, so it is just an empty string.

document.getElementById('submit-button').onclick = function() {
    var text = document.getElementById('code').value;
    alert(text);
};