Adding text to an existing text element in JavaScript via DOM

Question

The reason that appendChild is not a function is because you’re executing it on the textContent of your p element.

You instead just need to select the paragraph itself, and then append your new text node to that:

var paragraph = document.getElementById("p");
var text = document.createTextNode("This just got added");

paragraph.appendChild(text);

<p id="p">This is some text</p>

However instead, if you like, you can just modify the text itself (rather than adding a new node):

var paragraph = document.getElementById("p");

paragraph.textContent += "This just got added";

<p id="p">This is some text</p>