Continue scrolling the HTML page before it reaches the end

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I am currently troubleshooting an issue with my chat thread.

At the moment, the chat window automatically scrolls up when it reaches the bottom of the page to ensure it is always visible. However, there is a problem where it hides behind the form before reaching the actual bottom of the page. Therefore, I need to redefine what constitutes the bottom of my page:

I have attempted the following solution:

function scroll() {
    window.scrollTo(0, document.body.scrollHeight + document.getElementById('form_id').offsetHeight);
};

Unfortunately, it seems that this function has no effect due to the listener function preceding it.

Below is the remaining code for reference:

<html>
    <head>
        <title>Chat Demo</title>

        [<!-- styles and other HTML elements omitted for brevity -->]

    </head>

    <body>

        <section class="module">

            <div id="wrapper">
                <div id="header">
                    <header class="top-bar">
                        <h1>Chat Demo</h1>
                    </header>
                </div>
                <div id="content">
                    <ol id="messages"></ol>
                </div>
                <div id="footer">
                    <form id="form_id" action = "#">
                        <input id = "user_input"/>
                        <button id="btn_id">send</button>
                    </form>
                </div>
            </div>
        </section>

        [<!-- JavaScript scripts and dependencies added here -->]
        
    </body>
</html>

Answer №1

When using JavaScript for scrolling, the default behavior is to scroll up to the maximum possible value. In this scenario, it typically scrolls to the size of the scrollable contents. To adjust this behavior and ensure that there is enough space below the form for scrolling, you can add additional empty space behind the form.

If your code does not include any CSS, you can simply add the following:

ol { padding-bottom: 50px; }

In this code snippet, 50px represents the height of the form, allowing for proper scrolling functionality.

Alternatively, if you always want to scroll to the bottom, you can use a larger end value like 999999 instead of calculating the exact height. Most browsers are intelligent enough to interpret this as scrolling to the maximum extent.

Answer №2

To achieve the desired output, simply include this CSS code in your HTML page: div#footer { margin-top: 10px; }

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