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>neveropen</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:
neveropen
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">             neveropen         </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:
neveropen null
