Kevin Powell - Community•2y ago

Mobile virtual-keyboard pushes up content

I have an html layout / css problem in a basic chat application. There is a page with a chat-header a chat-body and a chat-footer. Body contains the messages, it is scrollable, the footer contains the text input. When the user clicks on the text input, the entire content is pushed up on mobile, and i can't see my header. Here is a snippet

body{
        display: flex;
        flex-direction: column;
        padding: 0px;
        margin: 0px;
        overflow: hidden;
        position: fixed;
        top: 0px;
        left: 0px;
        height: 100svh;
    }

    .chat {
        flex-grow: 1;
        overflow: auto;
        padding: 15px;
    }

    .footer,
    .header {
        padding: 15px;
        background-color: cornflowerblue;
        color: white;
    }

body{
        display: flex;
        flex-direction: column;
        padding: 0px;
        margin: 0px;
        overflow: hidden;
        position: fixed;
        top: 0px;
        left: 0px;
        height: 100svh;
    }

    .chat {
        flex-grow: 1;
        overflow: auto;
        padding: 15px;
    }

    .footer,
    .header {
        padding: 15px;
        background-color: cornflowerblue;
        color: white;
    }

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
        <link rel="stylesheet" href="style.css">
    </head>
    <body>
        
        <div class="header">
            <button>Menu</button>
        </div>
        <div class="chat">
          <!-- loremx500 -->
</div>
        <div class="footer">
            <input type="text" placeholder="Type here..." name="" id="">
        </div>

    </body>
    </html>

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
        <link rel="stylesheet" href="style.css">
    </head>
    <body>
        
        <div class="header">
            <button>Menu</button>
        </div>
        <div class="chat">
          <!-- loremx500 -->
</div>
        <div class="footer">
            <input type="text" placeholder="Type here..." name="" id="">
        </div>

    </body>
    </html>

2 Replies

Dr.Random•2y ago

Here is how it looks like on mobile when the virtual keyboard is visible: https://i.stack.imgur.com/RNLmu.png The weird thing is that i can scroll the body or at least the document, even if i specified the following css for the body:

    body{
        display: flex;
        flex-direction: column;
        padding: 0px;
        margin: 0px;
        overflow: hidden;
        position: fixed;
        top: 0px;
        left: 0px;
        height: 100svh;
    }

    body{
        display: flex;
        flex-direction: column;
        padding: 0px;
        margin: 0px;
        overflow: hidden;
        position: fixed;
        top: 0px;
        left: 0px;
        height: 100svh;
    }

I have tried without flex box, with different positions and different javascript alternatives. Tried to make my header and footer fixed/absolute but it did not help either. When my footer is fixed, it works in a way, but the header does not. This javascript snippet is helping somewhat.

    var body = document.querySelector("body");
    if (window && window.visualViewport){
        visualViewport.addEventListener('resize', function(){
            let viewHeight = visualViewport.height;
            body.style.height = `${viewHeight}px`;
        });
    }

    var body = document.querySelector("body");
    if (window && window.visualViewport){
        visualViewport.addEventListener('resize', function(){
            let viewHeight = visualViewport.height;
            body.style.height = `${viewHeight}px`;
        });
    }

It does resize my body to the correct height when the virtual keyboard is visible but i can still scroll the entire document?? The javascript "fix" is what i want, but without the ability to scroll the document meanwhile. I want the same chat behaviour which is on discord or any other message platform. When the virtual keyboard pops up, i want to squeeze my chat message body into the available space along with my header and footer. Here is a gif demonstrating the javascript fix problem:

Dr.Random•2y ago

Gaming

Programming

Mobile virtual-keyboard pushes up content