Can someone tell me what comes after my nextElementSibling in this specific scenario?

I am puzzled by the usage of nextElementSibling in this code. Can someone provide an explanation on what exactly it is and where it should be used? Thank you in advance! Also, my code seems to be malfunctioning as I keep receiving an error message that says "Uncaught TypeError: Cannot read property 'style' of null at HTMLButtonElement." Does anyone have any insights on what might be causing this issue? For security reasons, I will share my code in the comment section instead of here. Apologies for any inconvenience this may cause!

Answer №1

Here are my code snippets. Unfortunately, I couldn't attach them to my question so I'm leaving them here. Thank you in advance for your assistance!

JavaScript:

var coll = document.getElementsByClassName("collapsible")

for (let i=0; i<coll.length; i++) {
    coll[i].addEventListener('click', function(){
        this.classList.toggle("active")

        var content = this.nextElementSibling

        if(content.style.maxHeight){
            content.style.maxHeight = null
        }else{
            content.style.maxHeight = content.scrollHeight + "px"
        }
    } )
}

HTML:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title></title>
    <link rel="stylesheet"  href="mes.css">
    <link rel="stylesheet"  href="chat.css">
    <script src="https://kit.fontawesome.com/48a972c999.js" crossorigin="anonymous"></script>
</head>
<body>
    <!--CHAT BAR BLOCK-->
    <div class="chat-bar-collapsible">
        <button id="chat-button" type="button" class="collapsible">Chat With Us! 
        <i id="chat-icon" style="color:#fff" class="fa fa-fw fa-comments-o"></i>
        </button>
    </div>
    <div class="content">
        <div class="full-chat-block">
            <!--Message Container-->
            <div class="outer-container">
                <div class="chat-container">
                    <!--Message-->
                    <div id="chatbox">
                        <h5 id="chat-timestamp"></h5>
                        <p id="botStarterMessage" class="botText"><span>Loading...</span></p>
                    </div>
                    <!--User Input Box-->
                    <div class="chat-bar-input-block">
                        <div id="userInput">
                            <input type="text" id="textInput" class="input-box" name="msg" placeholder="Tap 'enter' to send a message">
                            <p></p>
                        </div>
                        <div class="chat-bar-icon">
                            <i id="chat-icon" style="color:crimson" class="fa fa-fw fa-heart" onClick="heartButton()"></i>
                            <i id="chat-icon" style="color:#333" class="fa fa-fw fa-send" onClick="sendButton()"></i>
                        </div>

                        <div id="chat-bar-bottom">
                            <p></p>
                        </div>
                    </div>

                </div>

            </div>

        </div>

    </div>

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script src="mes.js"></script>
</body>
</html>

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