What is getElementById()?
- It is used to select a single HTML element using its unique id attribute.
- Returns an Element object if a match is found; otherwise, it returns null.
<h1 id="title">Hello</h1>
let el = document.getElementById("title");
console.log(el);
Output :
<h1 id="title">Hello</h1>
Changing content :
el.textContent = "Hello, JavaScript!";
el.innerText = "Hi!";
el.innerHTML = "<b>How</b>";
Changing Style :
el.style.color ="red";
el.style.backgroundColor ="yellow";
document.body.style.backgroundColor = "black";
Adding Event :
<body>
<h1 id="title">Hello</h1>
<button id="btn">click</button>
<script>
let el = document.getElementById("title");
let btn = document.getElementById("btn");
btn.addEventListener("click", () => {
el.innerText ="Wecome!";
});
</script>
</body>
