Question

我有一个允许我上传图片的表单： - ）

当我选择要上传的图像时，它可以设置白色区域，图像为背景图像＆amp;还会删除文本“选择图像”。

代码：

$("input[name='FileOne']").on("change", function(event1) {
     	src1 = URL.createObjectURL(event1.target.files[0]);
     	document.getElementById("FileOne").style.backgroundImage = 'url('+src1+')';
});

.form-file-upload-container {
    float: left;
    width: 100%;
    margin-bottom: 12px;
    margin-top: 12px
}

@media (min-width: 640px) {
    .form-file-upload-container {
        margin-bottom: 20px;
        margin-top: 20px
    }
}

.form-file-upload {
    position: relative;
    float: left;
    width: 48.5%;
    height: auto;
    margin-right: 3%;
    margin-bottom: 3%
}

@media (min-width: 450px) {
    .form-file-upload {
        width: 31.3333%
    }
}

@media (min-width: 750px) {
    .form-file-upload {
        width: 22.75%
    }
}

@media (min-width: 1600px) {
    .form-file-upload {
        width: 14.1666667%;
        margin-right: 2%
    }
}

.form-file-upload:nth-child(2n) {
    margin-right: 0
}

@media (min-width: 450px) {
    .form-file-upload:nth-child(2n) {
        margin-right: 3%
    }
}

@media (min-width: 1600px) {
    .form-file-upload:nth-child(2n) {
        margin-right: 2%
    }
}

@media (min-width: 450px) {
    .form-file-upload:nth-child(3n) {
        margin-right: 0
    }
}

@media (min-width: 750px) {
    .form-file-upload:nth-child(3n) {
        margin-right: 3%
    }
}

@media (min-width: 1600px) {
    .form-file-upload:nth-child(3n) {
        margin-right: 2%
    }
}

@media (min-width: 750px) {
    .form-file-upload:nth-child(4n) {
        margin-right: 0
    }
}

@media (min-width: 1600px) {
    .form-file-upload:nth-child(4n) {
        margin-right: 2%
    }
}

@media (min-width: 1600px) {
    .form-file-upload:nth-child(6n) {
        margin-right: 0
    }
}

.form-file-upload-inner {
    width: 100%;
    height: 0;
    padding-top: 133.33333%
}

.form-file-upload label {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: white;
    z-index: 2;
    cursor: pointer;
    border: 1px solid #AFAFB4;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    color: #AFAFB4;
    -webkit-transition: background 0.2s ease, border 0.2s ease;
    -moz-transition: background 0.2s ease, border 0.2s ease;
    -o-transition: background 0.2s ease, border 0.2s ease;
    transition: background 0.2s ease, border 0.2s ease
}

.form-file-upload span {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    font-size: 15px;
    text-align: center;
    -webkit-transform: translateY(-50%);
    -moz-transform: translateY(-50%);
    -ms-transform: translateY(-50%);
    -o-transform: translateY(-50%);
    transform: translateY(-50%)
}

.form-file-upload span:before {
    content: '';
    background: url(../img/image-upload-icon.png) no-repeat center center #fff;
    background: url(../img/image-upload-icon.svg) no-repeat center center #fff;
    background-size: 65px 56px;
    display: block;
    width: 65px;
    height: 56px;
    margin: 0 auto;
    margin-bottom: 5px
}

.form-file-upload input {
    position: relative;
    opacity: 0;
    z-index: 1
}

.form-file-upload .close {
    display: none;
    position: absolute;
    top: -13px;
    right: -13px;
    width: 26px;
    height: 26px;
    font-size: 18px;
    text-align: center;
    line-height: 26px;
    background: white;
    z-index: 3;
    -webkit-transition: background 0.2s ease, color 0.2s ease;
    -moz-transition: background 0.2s ease, color 0.2s ease;
    -o-transition: background 0.2s ease, color 0.2s ease;
    transition: background 0.2s ease, color 0.2s ease
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="form-file-upload">
<div class="form-file-upload-inner">
        <label for="FileOne"><span>Select Image</span></label><span class="wpcf7-form-control-wrap FileOne"><input type="file" name="FileOne" size="40" class="wpcf7-form-control wpcf7-file" id="FileOne" aria-invalid="false" /></span><button class="close" type="button"></button>
    </div>
</div>

Answer 1

你很亲密。但是你在这里选择了错误的元素：

document.getElementById("FileOne")

应该是：

document.querySelector("[for=FileOne]")

如果您使用前者，您将选择输入字段本身，您已正确呈现为不可见。您必须将要填充图像的区域作为目标。在您的情况下，<label>元素应该没问题，因为它还定义了可点击区域。

从文件上传

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