D3.js selector() Function

0 0 1 minute read

The d3.selector() function is used to return a function that returns the very first descendant of the element given as the parameter.

Syntax:

 d3.selector(selector)

Parameters: This function takes only one parameter which is given above and described below:

selector: This is the string of the element that is to be selected.

Return Values: This function returns a boolean value.

Below given are a few examples of the function given above.

Example 1:

<!DOCTYPE html>  
<html lang="en">  
<head>  
    <meta charset="UTF-8">  
    <meta name="viewport"
            path1tent="width=device-width,  
                    initial-scale=1.0">  
    <title>Document</title>  
</head>  
<style> 
    p{ 
        line-height:5px; 
    } 
</style>  
<body>   
    <div> 
  
    </div> 
    <div> 
        <p>This is para1</p> 
        <p>This is para2</p> 
        <p>This is para3</p> 
        <p>This is para4</p> 
    </div> 
  <script src =  
"https://d3js.org/d3.v4.min.js">  
  </script> 
  <script> 
      // Parent of div is HTML  
    var div = d3.select("div").select(d3.selector("div")); 
    console.log(div); 
  </script>  
</body>  
</html>

Output:

Example 2:

<!DOCTYPE html>  
<html lang="en">  
<head>  
    <meta charset="UTF-8">  
    <meta name="viewport"
            path1tent="width=device-width,  
                    initial-scale=1.0">  
    <title>Document</title>  
</head>  
<style> 
    p{ 
        line-height:5px; 
    } 
</style>  
<body>   
    <div> 
        <p>This is para1 
              
        <p>This is para2</p> 
          
        <p>This is para3</p> 
        </p> 
    </div> 
  <script src =  
"https://d3js.org/d3.v4.min.js">  
  </script> 
  <script> 
      // First descendant of Div  
    var para = d3.select("div").select(d3.selector("p")); 
    console.log(para); 
      
      // First descendant of Div  
    var p = d3.select("div").select("p"); 
    console.log(p); 
  
    console.log("Both p and para are equal"); 
    console.log(para.node()); 
    console.log(p.node()); 
  
  </script>  
</body>  
</html>

Output:

Whether you’re preparing for your first job interview or aiming to upskill in this ever-evolving tech landscape, zambiatek Courses are your key to success. We provide top-quality content at affordable prices, all geared towards accelerating your growth in a time-bound manner. Join the millions we’ve already empowered, and we’re here to do the same for you. Don’t miss out – check it out now!