The selection.size() function in D3.js is used to calculate and return the size of the selection. It counts the total element in the selection and returns its size.
Syntax:
selection.size();
Parameters: This function does not accept any parameters.
Return Value: This function returns a Numerical value.
Example 1: When selection is non-empty.
HTML
<!DOCTYPE html> <html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" path1tent=
"width=device-width,initial-scale=1.0">
<script src=
</script>
<script src=
</script>
</head>
<body>
<div>Geeks for Geeks </div>
<div></div>
<div></div>
<div></div>
<div></div>
<script>
let selection = d3.selectAll("div")
let div = selection.size();
console.log(div)
</script>
</body>
</html>
|
Output:
5
Example 2: When selection is empty.
HTML
<!DOCTYPE html> <html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" path1tent=
"width=device-width,initial-scale=1.0">
<script src=
</script>
<script src=
</script>
</head>
<body>
<script>
let selection=d3.selectAll("h2")
let size=selection.size();
console.log(size)
</script>
</body>
</html>
|
Output:
0