document.getElementById 通过 JS 而不是 HTML 给出 Null

Question

When I am defining my input tag in html and accessing in JS by id then I am getting my tag.

HTML Code:

<input class="easyui-combobox" name="language" style="width:30%;" id= "XX">

JS Code:

var cc = document.getElementById("XX");

Here things are fine.

But When I am creating from javascript and trying to access I am getting. I want dynamic So I need to create from JS.

JS Code:

var input = document.createElement("input");
input.className = 'easyui-combobox';
input.style = 'width:30%';
input.id = "XX";

Here I am getting null after applying this:

var cc = document.getElementById("XX");

Answer 1

You have to append your created element into the document using document.body.appendChild(input);

 var input = document.createElement("input"); input.className = 'easyui-combobox'; input.style = 'width:30%'; input.id = "XX"; document.body.appendChild(input); console.log(document.getElementById("XX"));

Answer 2

You have not appended your element

var input = document.createElement("input");
input.className = 'easyui-combobox';
input.style = 'width:30%';
input.id = "XX";
document.body.appendChild(input); 

var cc = document.getElementById("XX");
console.log(cc);

Answer 3

You need to append input element to document

var input = document.createElement("input");
input.className = 'easyui-combobox';
input.style = 'width:30%';
input.id = "XX";
document.body.appendChild(input);

Answer 4

You have created your element using -

var input = document.createElement("input");

Now you need to append it to HTML so that you can find it on DOM.

 var input = document.createElement("input"); input.className = 'easyui-combobox'; input.style = 'width:30%'; input.id = "XX"; document.body.appendChild(input); var fetchedElement = document.getElementById("XX"); console.log(fetchedElement);

• createElement() creates an Element Node.
• appendChild() adds your element node to DOM.

Answer 5

The element has been created, but needs to be appended to the DOM . Use the appendChild() or insertBefore() method.

var input = document.createElement("input");
input.className = 'easyui-combobox';
input.style = 'width:30%';
input.id = "XX";
document.body.appendChild(input);