Java 脚本函数无法正常替换标签上所选文件的名称

Java Script function not working correctly to replace the name of the selected file on the label tag

我正在尝试使用代码通过 CSS 和 JS 更改 html 中 file 类型按钮的样式。不知何故,JS 功能无法正常工作,并且没有替换标签上所选文件的名称。以下是 jsfiddle 中的代码:See the codes in jsfiddle

感谢任何帮助!

html:

<input type="file" name="file" id="file" class="inputfile" data-multiple-caption="{count} files selected" multiple />
<label for="file"><strong>Choose a file</strong></label>

css:

.inputfile {
    width: 0.1px;
    height: 0.1px;
    opacity: 0;
    overflow: hidden;
    position: absolute;
    z-index: -1;
}

.inputfile + label {
    font-size: 1.25em;
    font-weight: 700;
    color: white;
    background-color: black;
    display: inline-block;
}

.inputfile:focus + label,
.inputfile + label:hover {
    background-color: red;
}

.inputfile + label {
    cursor: pointer; /* "hand" cursor */
}

js:

var inputs = document.querySelectorAll( '.inputfile' );
Array.prototype.forEach.call( inputs, function( input )
{
    var label    = input.nextElementSibling,
        labelVal = label.innerHTML;

    input.addEventListener( 'change', function( e )
    {
        var fileName = '';
        if( this.files && this.files.length > 1 )
            fileName = ( this.getAttribute( 'data-multiple-caption' ) || '' ).replace( '{count}', this.files.length );
        else
            fileName = e.target.value.split( '\' ).pop();

        if( fileName )
            label.querySelector( 'span' ).innerHTML = fileName;
        else
            label.innerHTML = labelVal;
    });
});

您的标签中没有 span 标签

改变这个

label.querySelector( 'span' ).innerHTML = fileName;

对此

label.querySelector( 'strong' ).innerHTML = fileName;