The selection.classed() function is used to set the class to the selected element. This function can also be used to unset the class to a particular element that is selected.
Syntax:
selection.classed(names[, value]);
Parameters: The above-given function takes two parameters which are given above and described below:
- name: It is the name of the class to be given to the element that is selected.
- value: It is the boolean value i.e true or false to set or unset the class.
Return Values: This function does not return anything.
Example 1: Setting the class name.
HTML
<!DOCTYPE html> <html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" path1tent="width=device-width,
initial-scale=1.0">
</script>
</head>
<body>
<div>
<a>GeeksforGeeks</a>
</div>
<script>
// Sets the class to the a tag
var a = d3.select("a")
.classed("className", true);
// This will select the anchor tag
var divselect = document.querySelector(".className");
console.log(divselect.innerHTML);
</script>
</body>
</html>
|
Output:
GeeksforGeeks
Example 2: Unset the class name.
HTML
<!DOCTYPE html> <html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" path1tent="width=device-width,
initial-scale=1.0">
</script>
</head>
<body>
<div>
<p class="classGiven classGiven2">
GeeksforGeeks
</p>
</div>
<script>
// Unsets the class named classGiven
// to the "p" tag
var a = d3.select("p")
.classed("classGiven2", false);
// This will select the "p" tag
var divselect = document
.querySelector(".classGiven");
console.log(divselect.innerHTML);
// This will not select the "p" tag
// As the classGiven 2 is unset
var divselect = document
.querySelector(".classGiven2");
console.log(divselect);
</script>
</body>
</html>
|
Output:
GeeksforGeeks null