Local image upload preview

After adding some beautification, set the width and height of the input tag under the div to 100%, so that the input tag can be touched on the div on the mouse hover. Recommended address: address

<!DOCTYPE html>
<html lang="en">

<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>Document</title>
    <style>
        .div-img {
            background-color: #ccc;
            width: 300px;
            height: 300px;
            background-image: url('');
        }

        .div-file {
            width: 100px;
            height: 30px;
            border: 2px solid yellow;
            border-radius: 5px;
            text-align: center;
            line-height: 30px;
            position: relative;
        }

        input {
            width: 100%;
            height: 100%;
            opacity: 0;
            z-index: 999;
            position: absolute;
            top: 0;
            left: 0;
        }
    </style>
</head>

<body>
    <div class="div-img">
    </div>
    <div class="div-file">
        click
        < input class ="inp-img" type ="file" > 
    </ div > 
    < script > 
        var div_img = document.getElementsByClassName( ' div-img ' )[ 0 ];
         var inp_img = document.getElementsByClassName( ' inp -img ' )[ 0 ];
         // Check if the browser supports FileReader 
        if ( typeof (FileReader) ===  ' undefined ' ) {
            result.innerHTML =  " Sorry, your browser does not support FileReader, please use a modern browser! " ;
            inp_img.setAttribute('disabled', 'disabled');
        } else {
             // Enable listening 
            inp_img.addEventListener( ' change ' , readFile, false );
        }
        function readFile() {
             var file =  this .files[ 0 ];
             // Limit the type of uploaded file to determine whether it is an image type 
            if ( ! / image\/\w+ / .test(file.type)) {
                alert( " Only pictures can be selected " );
                 return  false ;
            }
            var reader = new FileReader();
            reader.readAsDataURL(file);
            reader.onload = function (e) {
                base64Code = this.result;
                console.dir(base64Code);
                div_img.style.backgroundImage = `url(${base64Code})`;
            }
        }
    </script>
</body>

</html>

Local image upload preview

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