D3.js selection.html() Function

Last Updated : 31 Aug, 2020

The selection.html() function is used to set the inner HTML on all the selected elements. If the value is constant then all the elements are given same value. A null value will clear the content of the element.

Syntax:

selection.html([value]);

Parameters: This function accepts single parameter as mentioned above and described below:

Value: It is of type string that sets the HTML to the document.

Return Value: This function does not return anything.

Example 1: In the following code, the HTML “p” element content is changed to “bold” text.

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> 
  
    <style> 
        p { 
            background-color: #f2f2f2; 
            padding: 10px; 
            width: 200px; 
            line-height: 5px; 
        } 
  
        p:hover { 
            background-color: grey; 
            padding: 10px; 
            cursor: pointer; 
        } 
    </style> 
</head> 
  
<body> 
    <div> 
        <h1 style="color:green;"> 
            GeeksforGeeks 
        </h1> 
          
        <h4>D3.js selection.html() Function</h4> 
  
        <p>Click Here!</p> 
    </div> 
  
    <script> 
        function func() { 
  
            // Selecting all p and setting 
            // the innerHTML of the p 
            var chk = d3.selectAll("p") 
                .html("<b>This is from .html</b>"); 
            var text = document.querySelector("p"); 
        } 
        let btn = document.querySelector("p"); 
        btn.addEventListener("click", func); 
    </script> 
</body> 
  
</html> 

Output:

Example 2: The following example clears the content using null.

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> 
    <style> 
        p { 
            background-color: #f2f2f2; 
            padding: 10px; 
            width: 200px; 
            line-height: 5px; 
        } 
  
        p:hover { 
            background-color: grey; 
            padding: 10px; 
            cursor: pointer; 
        } 
    </style> 
</head> 
  
<body> 
    <div> 
        <h1 style="color:green;"> 
            GeeksforGeeks 
        </h1> 
  
        <h4>D3.js selection.html() Function</h4> 
  
        <p><b>Click Here</b></p> 
    </div> 
  
    <script> 
        function func() { 
  
            // Selecting p and setting the 
            // innerHTML of the p 
            var chk = d3.selectAll("p") 
                .html(null); 
            var text = document.querySelector("p"); 
        } 
        let btn = document.querySelector("p"); 
        btn.addEventListener("click", func); 
    </script> 
</body> 
  
</html> 

Output:

D3.js selection.merge() Function

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