D3.js selection.empty() Function

0 0 1 minute read

The d3.empty() function in D3.js is used to return a boolean value. The value is true when the selection contains no elements and it returns false when the selection is non-empty.

Syntax:

selection.empty();

Parameters: This function takes no parameters.

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>  
div{ 
    background-color: green; 
    margin-bottom: 5px; 
    padding: 10px; 
    width: fit-content; 
} 
</style>  
<body>   
    <div>Some text</div> 
    <div>Geeks for zambiatek</div> 
    <div>Geeks for zambiatek</div> 
    <div>Some text</div> 
  <script src =  
"https://d3js.org/d3.v4.min.js">  
  </script> 
  <script src= 
  "https://d3js.org/d3-selection.v1.min.js"> 
</script> 
  <script> 
      let selection=d3.selectAll("div") 
      console.log(selection.empty()) 
  </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>  
div{ 
    background-color: green; 
    margin-bottom: 5px; 
    padding: 10px; 
    width: fit-content; 
} 
</style>  
<body>   
    <div>Some text</div> 
    <div>Geeks for zambiatek</div> 
    <div>Geeks for zambiatek</div> 
    <div>Some text</div> 
  <script src =  
"https://d3js.org/d3.v4.min.js">  
  </script> 
  <script src= 
  "https://d3js.org/d3-selection.v1.min.js"> 
</script> 
  <script> 
    // Selection is empty because no 
    // container name h2 is rendered. 
      let selection=d3.selectAll("h2") 
      console.log(selection.empty()) 
  </script>  
</body>  
</html>