How to check if an element has any children in JavaScript ?

The task is find out whether an element is having child elements or not with the help of JavaScript. We’re going to discuss few techniques.

Approach:

  • Select the Parent Element.
  • Use one of the firstChild, childNodes.length, children.length property to find whether element has child or not.
  • hasChildNodes() method can also be used to find the child of the parent node.

Example 1: In this example, hasChildNodes() method is used to determine the child of <div> element.



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<!DOCTYPE HTML>
<html>
  
<head>
    <title>
        How to check if element has
        any children in JavaScript ?
    </title>
</head>
  
<body style="text-align:center;">
      
    <h1 style="color:green;"
        GeeksForGeeks
    </h1>
      
    <div id="div">
        <p id="GFG_UP" style=
            "font-size: 19px; font-weight: bold;">
        </p>
    </div>
      
    <button onclick="GFG_Fun()">
        click here
    </button>
      
    <p id="GFG_DOWN" style=
        "color:green; font-size:24px; font-weight:bold;">
    </p>
      
    <script>
        var parentDiv = document.getElementById("div");
        var el_up = document.getElementById("GFG_UP");
        var el_down = document.getElementById("GFG_DOWN");
          
        el_up.innerHTML = "Click on the button to check "
                    + "whether element has children.";
  
        function GFG_Fun() {
            var ans = "Element <div> has no children";
              
            if (parentDiv.hasChildNodes()) {
                ans = "Element <div> has children";
            }
              
            el_down.innerHTML = ans;
        }
    </script>
</body>
  
</html>

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Output:

  • Before clicking on the button:
  • After clicking on the button:

Example 2: In this example, children.length Property is used to determine the child of <div> element.

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<!DOCTYPE HTML>
<html>
  
<head>
    <title>
        How to check if element has
        any children in JavaScript ?
    </title>
</head>
  
<body style="text-align:center;">
      
    <h1 style="color:green;"
        GeeksForGeeks
    </h1>
      
    <div id="div">
        <p id="GFG_UP" style=
            "font-size: 19px; font-weight: bold;">
        </p>
    </div>
      
    <button onclick="GFG_Fun()">
        click here
    </button>
      
    <p id="GFG_DOWN" style=
        "color:green; font-size:24px; font-weight:bold;">
    </p>
      
    <script>
        var parentDiv = document.getElementById("div");
        var el_up = document.getElementById("GFG_UP");
        var el_down = document.getElementById("GFG_DOWN");
          
        el_up.innerHTML = "Click on the button to "+
                "check whether element has children.";
  
        function GFG_Fun() {
            var ans = "Element <div> has no children";
              
            if (parentDiv.children.length > 0) {
                ans = "Element <div> has children";
            }
              
            el_down.innerHTML = ans;
        }
    </script>
</body>
  
</html>

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Output:

  • Before clicking on the button:
  • After clicking on the button:


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