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HTML DOM header object
The HTML DOM header object is associated with the HTML <header> element that introduced in HTML 5. Using the header object we can create and access <header> element using the createElement() and getElementById() method respectively.
Syntax
Following is the syntax for −
Creating a header object −
var p = document.createElement("HEADER");Example
Let us look at an example for the HTML DOM header object −
<!DOCTYPE html>
<html>
<body>
<h1>Header object example</h1>
<p>Create a header element by clicking the below button</p>
<button onclick="headerCreate()">CREATE</button>
<script>
function headerCreate() {
var h = document.createElement("HEADER");
document.body.appendChild(h);
var h2 = document.createElement("H2");
var txt = document.createTextNode("Header element containing a h2 element is now created");
h2.appendChild(txt);
h.appendChild(h2);
}
</script>
</body>
</html>Output
This will produce the following output −
On clicking the CREATE button −
In the above example −
We have created a button CREATE that will execute the createHeader() method when clicked by the user −
<button onclick="headerCreate()">CREATE</button>
The headerCreate() method creates a header element using the createElement() method upon document object and assigns it to variable h. It then calls the appendChild() method on the document body to append the header as a child to document body. Using the same method above we create an <h2> element and a text node for it using the createTextNode() method of the document object.
The text node is appended to the <h2> element using the appendChild() method. Finally the <h2> element along with the text node are appended as child of the header element using the appendChild() method −
function headerCreate() {
var h = document.createElement("HEADER");
document.body.appendChild(h);
var h2 = document.createElement("H2");
var txt = document.createTextNode("Header element containing a h2 element is now created");
h2.appendChild(txt);
h.appendChild(h2);
}
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