D3.js selection.node() Function

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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 src="https://d3js.org/d3.v4.min.js"> 
    </script> 
    <script src= 
    "https://d3js.org/d3-selection.v1.min.js"> 
    </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 src="https://d3js.org/d3.v4.min.js"> 
    </script> 
    <script src= 
    "https://d3js.org/d3-selection.v1.min.js"> 
    </script> 
</head> 
  
<body> 
    <div>Some text</div> 
    <div>Geeks for <div>zambiatek</div> 
    </div> 
    <div>Geeks <div></div> for zambiatek</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> 