About
This page shows you how to select an element via the id attribute
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Demo
getElementById
The function getElementById of the document object permits to pass the id value in order to select the element
Example:
- The Javascript
let id = "box"
let element = document.getElementById(id);
console.log(`The innerText of the element with the id ${id} is: ${element.innerText}`);
- The HTML
<div id="box" >Box selected with the id</div>
- The result:
Selector
querySelector
The function querySelector of the document object permits to pass a selector value in order to select the first element selectioned.
The selector id syntax is:
#id
Example:
- The javascript
let id = "box"
let selector = "#"+id;
let element = document.querySelector(selector);
console.log(`The innerText of the element with the id ${id} is: ${element.innerText}`);
- The HTML
<div id="box" >Box selected with a selector</div>
- The result:
css
All CSS rules are based on selector.
Example:
- The HTML
<p id="TheId">A blue paragraph</p>
#TheId { color:blue; }
- The result
window shortcut
The javascript window objects lets you select the element by id directly with the short notation
<h1 id="id1">H1 Content</h1>
console.log(window.id1.innerHTML);
JQuery
The jquery function accepts a selector value and manipulate all element at once. If we use a id selector, we will manipulate only one element.
Example:
- The javascript with the text() function
let id = "box"
let selector = "#"+id;
let element = $(selector);
console.log(`The innerText of the element with the id ${id} is: ${element.text()}`);
- The HTML
<div id="box" >Box selected with jquery</div>
- The result: