What steps can be taken to solve the JavaScript error provided below?

My objective is to create a new variable called theRightSide that points to the right side div.

var theRightSide =
    document.getElementById("rightSide");

Once all the images are added to the leftSide div, I need to use cloneNode(true) to copy the leftSide div. For example, leftSideImages = theLeftSide.cloneNode(true); Then, delete the last child of leftSideImages. Finally, add leftSideImages to the rightSide div.

Below is the code:

    <html>
    <head>
    <style type="text/css">
        img {
            position:absolute;
        }
        div {
            position:absolute;
            width:500px; 
            height:500px;
        }

        #rightSide { left: 500px; 
            border-left: 1px solid black; 
        }


    </style>

    </head>
    <body onload="generateFaces()">
        <h1>Matching Game</h1>
        <div id="leftSide"></div>
        <div id="rightSide"></div>
        <script>
            var numberOfFaces=5;
            var theLeftSide = document.getElementById("leftSide");
            function generateFaces(){
                for (var i = 0; i < numberOfFaces; i++) 
                {
                    var img = document.createElement("IMG");
                    img.src="smile.png";
                    img.style.top=Math.floor(Math.random()*401);
                    img.style.height=100;
                    img.style.left=Math.floor(Math.random()*401);
                    theLeftSide.appendChild(img);

                };
            }

            leftSideImages = theLeftSide.cloneNode(true);
            var theRightSide = document.getElementById("rightSide");
            leftSideImages.removeChild(leftSideImages.lastChild);
            theRightSide.appendChild(leftSideImages);
        </script>
    </body>
</html>

Error: Uncaught TypeError: Failed to execute 'removeChild' on 'Node': parameter 1 is not of type 'Node'.

Please assist me in rectifying these two errors.

Answer №1

The indication is that

const leftElement = document.getElementById("leftSide");

may be returning null. Have you confirmed if the element actually exists and has the specified id?

Fiddle: http://jsfiddle.net/8mbx4nr3/

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