The selection.node() function in D3.js is used to return the first element in the selection. If the selection does not contain any elements then it returns null.
Syntax:
selection.node()
Parameters: This function does not accept any parameters.
Return Values: This function returns the first element in the selection.
Example 1:
HTML
<!DOCTYPE html> <html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" path1tent=
"width=device-width,initial-scale=1.0">
</script>
<script src=
</script>
</head>
<body>
<h2>Some text</h2>
<div>Geeks for Geeks </div>
<script>
let selection = d3.selectAll("div")
let div = selection.node();
console.log(div)
// Printing innerHTML of the tag
console.log(div.innerHTML)
selection = d3.selectAll("h1")
// Null is returned
console.log(selection.node())
</script>
</body>
</html>
|
Output:
Example 2:
HTML
<!DOCTYPE html> <html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" path1tent=
"width=device-width,initial-scale=1.0">
</script>
<script src=
</script>
</head>
<body>
<div>Some text</div>
<div>Geeks for <div>geeks</div>
</div>
<div>Geeks <div></div> for geeks</div>
<div>Some text</div>
<script>
let selection = d3.selectAll("div")
console.log(selection.node())
selection = d3.selectAll("h2")
// Null is returned
console.log(selection.node())
</script>
</body>
</html>
|
Output: