"Enhance user interactions: Zooming in on input fields in

Currently, with the latest version of iOS (14.4), there is a zoom effect on any input box that receives focus, unless the input has a font size of 16px without focus.

While this may not seem like an issue initially, once focus moves away from the input box, the scaling remains and negatively impacts the page's appearance.

The viewport tag in the single main page is correctly configured:

<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />

Here is the React code snippet:

render() {
    return (
        <div className='my-form' style={this.props.style}>
            <h3>MyForm</h3>
            
            <div>
                <input 
                    {...InputGetterSetter(this, 'text')} 
                    placeholder="Please enter text"
                    onKeyDown={this.onKeyDown.bind(this)} />
            </div>

This is how the CSS is defined using SASS:

.my-form {
    width: 100%;
    height: 100%;
    text-align: center;
    
    @media screen and (-webkit-min-device-pixel-ratio:0) { 
        select,
        textarea,
        input {
          font-size: 16px;
        }
      }

    input {
        width: 66%;
        text-align: center;
    }

    .bottom-button {
        background-color: #00ac69;
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        height: 150px;
        outline: none;
        border: none;
        overflow: hidden;
    }
}

.keyboard-expanded {
    .my-form {
        .bottom-button {
            height: 60px;
            .ion-ios-telephone {
                font-size: 22pt;
            }
        }
    }
}

.dark {
    .my-form {
        input {
            color: white;
        }
    }
}

If you want to prevent zooming altogether, adjusting the font size can help. However, if you prefer to have the zoom effect but wish for it to "unzoom" when focus is removed, is there a way to achieve this?

Answer №1

Make sure to include the meta tag user-scalable=no in your code:

<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no, user-scalable=no">

Answer №2

The issue stemmed from the use of hash routing and relative links in a single-page app.

We resolved this by replacing the relative links with fully qualified URLs when navigating between pages, ultimately achieving the desired result of preventing zoom on iOS.

Although we ended up disabling zooming altogether, the original question was specifically about triggering an "unzoom" effect on iOS, which we successfully accomplished through this method.

Answer №3

Insert the following meta tag inside the <head></head> section,

<meta name="viewport" id="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=yes">

Add the following code within a <script></script> tag OR in a JavaScript file,

<script>
    window.addEventListener("load", afterLoaded, false);
    function afterLoaded() {
        document.getElementById("viewport").setAttribute("content", "width=device-width, 
        initial-scale=1.0, maximum-scale=1.0, user-scalable=yes");
    }
</script>

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