HTML DOM NodeList.keys() Method

The NodeList keys() method returns an iterator allowing you to go through all keys contained in this object. The keys are unsigned integers.

Syntax:

NodeList.keys();

Parameters: This method takes no parameter.

Return value: This method returns an iterator.

Example: In this example, we will create a NodeList and hence will get an iterator to get all keys from NodeList using this method.

javascript

<!DOCTYPE HTML> 
<html>  
<head>
    <meta charset="UTF-8">
    <title>HTML | DOM NodeList.keys() Method</title>
</head>   
 
<body style="text-align:center;">
    <h1 style="color:green;">  
     w3wiki
    </h1> 
    <p> 
HTML | DOM NodeList.keys() Method
    </p>
 
    <button onclick = "Beginner()">
    Click Here
    </button>
    <p id="a"></p>
    <script> 
        var a = document.getElementById("a");
        a.innerHTML = "elements are : "
        function Beginner(){
           var parentNode = document.createElement("div"); 
            var c1 = document.createElement("p"); 
            var c2 = document.createElement("span"); 
            var c3 = document.createElement("h1"); 
            parentNode.appendChild(c1); 
            parentNode.appendChild(c2); 
            parentNode.appendChild(c3); 
            var nodelist = parentNode.childNodes;
 
            for(var key of nodelist.keys()) { 
               console.log(key); 
 a.innerHTML += "<li>"+nodelist[key].localName + `</li>`;
            }
            console.log(nodelist.keys())
        }
</script>
</body>   
</html>

Output:

Before Clicking Button:

After Clicking Button: Elements are called using keys iterator.

In the console: Iterator keys can be seen.

Supported Browsers:

Google Chrome 51
Edge 16
Firefox 50
Safari 10
Opera 38
Internet Explorer not supported

javascript

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