js 实现文件上传样式详情

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1、概述

这个js包括按钮样式，列表样式、带有删除、添加、放大（使用的是自带的放大功能，提供有API来放入你的弹窗来进行展示）

可监听的事件	Value	wdaasd
onlargeClickCallBack	如果想使用自己的弹窗，只需要监听这个函数，拿到返回值给你的弹窗的img->href进行赋值即可	imgFile对象（包括这个被点击图片的全部信息）that（这个js的全局唯一对象，可以在这里面拿到你所有的值）
ondialogBeforeClose	自带的弹窗被关闭的回调	object 返回值是一个对象对象.event -> 被执行的事件的源事件对象.imgFile -> 被点击关闭弹窗时，目前弹窗上展示的图片对象信息
onaddImgList	每添加一个图片的回调	file -> 文件对象 that -> （这个js的全局唯一对象，可以在这里面拿到你所有的值）

2、创建对象的参数

参数	含义
maxFileLength	最大可以存在的文件个数默认值：2
maxFileSize	每个文件单独最大的文件大小默认值：1024 （1M）
fileSuffix	允许上传的文件后缀默认值：['mp4', 'mp3', 'word', 'pdf', 'ppt', 'excel', 'jpg', 'png']
StopDialog	是否阻止打开自带的默认弹窗默认值：false
shadeDialogStyle	如果打开自带弹窗的选项，那么这个控制打开的弹窗高宽多少默认值：[null, null],默认为null为自适应，如果想要设置百分比和px 请直接改变数组[0,1]，数组第一项代表宽，第二项代表高
showBtnImgStyle	是否开启按钮样式默认值：false

使用代码示例：

        <div class="hj-file">
            <input type="file" file="" class="hj-file-input">
            <div class="hj-box hj-append-item">
                <div class="append-item margin-class">
                    <div class="img-push">
                        <img src="./img/push.png" alt="">
                    </div>
                </div>
            </div>
           <!-- 在不开启按钮样式时，这个外层div可以删除 -->
            <div class="hj-btn-box hj-hidden">
                <div class="hj-btn">
                    选择图片
                </div>
            </div>
            <!-- 文件信息列表 -->
            <div class="hj-file-list">
            </div>
        </div>
var file = new File({
     maxFileLength: 2,
     maxFileSize: 1024,
     fileSuffix: ['mp4', 'mp3', 'word', 'pdf', 'ppt', 'excel', 'png', 'jpg'],
     StopDialog: false,
     showBtn: false
 });
 initHJFile(file);

3、监听例子

//如果不想使用自带的弹窗，可以选择监听file对象的onlargeClickCallBack函数
file.callBack.onlargeClickCallBack = function (img, that) {}
file.callBack.ondialogBeforeClose = function (event) {}
file.callBack.onaddImgList = function () {}

4、使用方法

项目目录如上图所示
如果要使用，只需要把js放入你的项目路径下，然后把img放到你的static目录（静态资源路径）。
这里js里面默认引入的图标是 ./ 的相对路径，请自行搜索然后进行更改为你项目的文件路径
上图项目示例为可直接打开查看的完整包，后文有下载地址

5、源代码

此源代码为不包括图标的源代码，全部在一个html页面里面

<!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>
</head>
<style>
    * {
        padding: 0;
        margin: 0;
    }

    body {
        width: 100vw;
        height: 100vh;
        /* display: flex;
        justify-content: center;
        align-items: center; */
    }

    /* .box {
        width: 600px;
    } */



    .hj-file {
        width: 100%;
        /* height: 100%; */

    }

    .hj-file-input {
        display: none;
    }

    .hj-box {
        display: flex;
        flex-wrap: wrap;
    }

    .append-item {
        width: 150px;
        height: 150px;
        border: 1px dashed #b1b5bb;
        border-radius: 5px;
        background-color: #fbfdff;
        display: flex;
        align-items: center;
        margin: 10px;
        justify-content: center;
    }

    .image-item {
        width: 150px;
        height: 150px;
        border-radius: 5px;
        margin: 10px;
        display: flex;
        justify-content: center;
        align-items: center;
        border: 1px solid #eaedf1;
        position: relative;
        background-size: 100% 100%;
        background-repeat: no-repeat;
        transition: 1s;
        animation: translaters 1s;
    }

    .image-item-delete {
        animation: bottom-translaters .7s;
    }

    @keyframes translaters {
        0% {
            opacity: .2;
            transform: translate(0, -50%);
        }

        100% {
            opacity: 1;
            transform: translate(0);
        }
    }

    @keyframes bottom-translaters {
        0% {
            opacity: 1;
            transform: translate(0, 0);
        }

        100% {
            opacity: .2;
            transform: translate(0, 50%);
        }
    }

    .img-push img {
        width: 60px;
        height: 60px;
    }

    .append-item:hover {
        border-color: #00d2fc;
    }

    .margin-class {
        margin-bottom: 20px;
    }

    .first {
        background-image: url('./img/66.jpg');
    }

    .z-index-promote {
        z-index: 3;
    }

    .largeImg img {
        cursor: pointer;
        width: 30px;
        height: 30px;
        transition: .6s;
        display: none;
    }

    .deleteImg img {
        cursor: pointer;
        width: 40px;
        height: 40px;
        display: none;
    }

    .image-item:hover::before {
        content: "";
        z-index: 2;
        background-color: #42393999;
        width: 100%;
        position: absolute;
        height: 100%;
        border-radius: 5px;
        transition: .6s;
        animation: transparency linear .6s;
    }

    .image-item:hover .largeImg img {
        display: block;
        animation: transparency linear .6s;
    }

    .image-item:hover .deleteImg img {
        display: block;
        animation: transparency linear .6s;
    }

    @keyframes transparency {
        0% {
            opacity: 0;
        }

        100% {
            opacity: 1;
        }
    }

    .hj-shade {
        width: 100vw;
        height: 100vh;
        background-color: #302d2d99;
        position: fixed;
        overflow: hidden;
        z-index: 1978;
        display: flex;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        justify-content: center;
        align-items: center;
        animation: hj-shade-sacle .5s;
    }

    @keyframes hj-shade-sacle {
        0% {
            transform: translate(-50%, -50%) scale(0%);
        }

        100% {
            transform: translate(-50%, -50%) scale(100%);
        }
    }

    @keyframes hj-shade-hidden {
        0% {
            transform: translate(-50%, -50%) scale(100%);
        }

        100% {
            transform: translate(-50%, -50%) scale(0%);
        }
    }

    .hj-shade-hidden {
        animation: hj-shade-hidden .5s;
    }

    .hj-shade {
        overflow: auto;
    }

    .hj-shade .hj-box {
        width: 60%;
        height: 80%;
        padding: 20px 10px 10px 10px;
        background-size: 100% 100%;
        background-color: white;
    }

    .hj-shade .hj-box .hj-img {
        width: 100%;
        overflow: auto;
        height: 100%;
    }

    .hj-file-list .hj-file-list-item {
        background-color: white;
        color: #8cacb3;
        display: flex;
        line-height: 2;
        font-size: 0.8em;
    }

    .hj-file-list .hj-file-list-item:hover {
        background-color: #00d2fc70;
        color: white;
    }

    .hj-file-list .hj-file-list-item .hj-left {
        width: 30%;
        overflow: hidden;
        white-space: nowrap;
        text-overflow: ellipsis;
    }

    .hj-file-list .hj-file-list-item .hj-left span {
        margin-left: 20px;
        cursor: pointer;
    }

    .hj-file-list .hj-file-list-item .hj-right {
        width: 30%;
        display: flex;
        align-items: center;
        justify-content: end;
    }

    .hj-file-list .hj-file-list-item .hj-right span {
        margin-right: 20px;
    }

    .hj-file-list .hj-file-list-item .hj-right img {
        width: 20px;
        height: 20px;
        cursor: pointer;
    }

    @keyframes hj-list-hidden {
        0% {
            opacity: 1;
        }

        100% {
            opacity: 0;
        }
    }

    .hj-list-hidden {
        animation: hj-list-hidden .7s;
    }

    .hj-btn-box {
        margin-bottom: 25px;
    }

    .hj-btn-box .hj-btn {
        margin-left: 20px;
        cursor: pointer;
        background-color: #009efa;
        width: 30%;
        line-height: 2;
        border-radius: 4px;
        color: white;
        font-size: 1.2em;
        text-align: center;
    }

    .hj-hidden {
        display: none;
    }
</style>

<body>
    <div class="box">
        <div class="hj-file">
            <input type="file" file="" class="hj-file-input">
            <div class="hj-box hj-append-item">
                <div class="append-item margin-class">
                    <div class="img-push">
                        <img src="./img/push.png" alt="">
                    </div>
                </div>
            </div>
            <div class="hj-btn-box hj-hidden">
                <div class="hj-btn">
                    选择图片
                </div>
            </div>
            <div class="hj-file-list">
            </div>
        </div>
    </div>

    <script>
        // File构造函数
        function File(obj) {
            // 文件总个数
            this.fileLength = 0;
            // 文件数组
            this.fileList = [];
            // 对象参数配置文件
            this.config = {
                // 最大文件个数
                maxFileLength: obj.maxFileLength || 2,
                // 最大文件大小
                maxFileSize: obj.maxFileSize || 1024,
                // 允许的文件后缀
                fileSuffix: obj.fileSuffix || ['mp4', 'mp3', 'word', 'pdf', 'ppt', 'excel', 'jpg', 'png'],
                // 是否阻止默认打开弹窗
                StopDialog: obj.StopDialog || false,
                // 弹窗的样式  宽 高
                shadeDialogStyle: obj.shade || [null, null],
                // 是否开启按钮样式
                showBtnImgStyle: obj.showBtn || false,
            };
            // fileDom中存储的唯一的dom节点
            this.dom = {
                // input 文件选中输入框dom
                inputDom: null,
                // append-item 添加点击dom
                imageItemDom: null,
                // 要向hj-append-item节点后面追加图片的dom
                appendItemDom: null,
                // 要向hj-file-list节点后面添加图片列表的dom
                appendListDom: null,

            };
            // 事件处理对象
            this.event = {
                    // append-item点击事件处理
                    imageItemClick: () => {
                        this.dom.inputDom.click();
                    },
                    // input 文件选中输入框选择完图片之后事件处理
                    changeLoadFile: (file) => {
                        this.method.filterFile(file.target.files);
                    },
                    // 图片删除事件
                    imgDeleteClick: (id) => {
                        for (let index = 0; index < this.fileList.length; index++) {
                            if (this.fileList[index].id == id) {
                                let _before = this.fileList.slice(0, index == this.fileList.length ? index - 1 :
                                    index);
                                let _after = this.fileList.slice(index + 1);
                                _before = _before.concat(_after);
                                // 删除图片
                                this.method.deleteImg(id);

                                setTimeout(() => {
                                    this.fileList[index].dom.remove();
                                    this.fileList[index].listDom.remove();
                                    this.fileLength--;
                                    this.fileList = _before;
                                }, 600);
                                break;
                            }
                        }
                        1

                    },
                    // 图片放大事件
                    imgLargeClick: (id) => {
                        let imgFile = this.privateUtils.foreachFileListToId(id);
                        console.log(imgFile);
                        this.callBack.onlargeClickCallBack(imgFile, this);
                        if (this.config.StopDialog) return;
                        let hjShadeDiv = document.getElementsByClassName('hj-shade');
                        if (hjShadeDiv.length != 0) return;
                        let div = document.createElement('div');
                        div.className = 'hj-shade';
                        let div2 = document.createElement('div');
                        div2.className = 'hj-box';
                        let img = document.createElement('img');
                        img.className = 'hj-img';
                        img.src = imgFile.base64;
                        div2.appendChild(img);
                        div.addEventListener('click', (event) => {
                            this.callBack.ondialogBeforeClose({
                                event: event,
                                imgFile: imgFile,
                            });
                            div.className = div.className + ' hj-shade-hidden';
                            setTimeout(() => {
                                document.body.removeChild(div);
                            }, 500);
                        })
                        // 防止在按钮模式下，会出现第一次没有加载完成，高长为0的不正常情况
                        img.onload = () => {
                            div.appendChild(div2);
                            document.body.appendChild(div);
                            this.privateUtils.computeDialogWH(img, div2);
                        }

                    },
                },
                this.method = {
                    // 过滤图片
                    filterFile: (list) => {
                        for (let index = 0; index < list.length; index++) {
                            let size = parseInt(list[index].size / 1024);
                            let suffix = list[index].name.substring(list[index].name
                                .lastIndexOf('.') + 1);
                            // 是否符合后缀
                            let isTrue = false;
                            // 判断文件大小
                            if (size > this.config.maxFileSize) {
                                console.log("文件太大");
                                break;
                            }
                            for (let j = 0; j < this.config.fileSuffix.length; j++) {
                                if (suffix == this.config.fileSuffix[j]) {
                                    isTrue = true;
                                    break;
                                }
                            }
                            if (isTrue) {
                                let id = parseInt(Math.random() * 100000);
                                this.fileList.push({
                                    id: id,
                                    file: list[index],
                                    base64: '',
                                    dom: '',
                                    listDom: '',
                                });
                                console.log(this.fileList);
                                this.method.streamToImgBase64(list[index], id);
                            } else {
                                console.log("文件后缀不符合");
                            }
                        }
                    },
                    // 处理图片展示
                    streamToImgBase64: (file, id) => {
                        var fileReader = new FileReader();
                        fileReader.onload = (data) => {
                            this.method.appendImage(data.target.result, id);
                        }
                        fileReader.readAsDataURL(file);

                    },
                    // 追加图片到dom节点中
                    appendImage: (url, id) => {
                        let div = document.createElement('div');
                        div.className = 'image-item margin-class';
                        div.style.backgroundImage = 'url(' + url + ')';
                        for (let index = 0; index < this.fileList.length; index++) {
                            if (this.fileList[index].id == id) {
                                this.fileList[index].dom = div;
                                this.fileList[index].base64 = url;
                                break;
                            }
                        }
                        // 创建删除dom,全部使用addEventListener
                        let largeDom = document.createElement('div');
                        largeDom.className = 'largeImg z-index-promote';
                        largeDom.innerHTML = `<img src="./img/big.png" alt="">`;
                        largeDom.addEventListener('click', () => {
                            this.event.imgLargeClick(id);
                        })
                        let deleteDom = document.createElement('div');
                        deleteDom.className = 'deleteImg z-index-promote';
                        deleteDom.innerHTML = `<img src="./img/delete.png" alt="">`;
                        deleteDom.addEventListener('click', () => {
                            this.event.imgDeleteClick(id);
                        })
                        div.appendChild(largeDom);
                        div.appendChild(deleteDom);
                        this.dom.appendItemDom.appendChild(div);
                        this.fileLength++;
                        // 添加图片列表
                        this.method.addImgList(id);
                    },
                    // 删除图片
                    deleteImg: (id) => {
                        for (let index = 0; index < this.fileList.length; index++) {
                            if (this.fileList[index].id == id) {
                                let item = this.fileList[index];
                                let cless = item.dom.getAttribute('class');
                                let clessList = item.listDom.getAttribute('class');
                                this.fileList[index].dom.setAttribute("class", cless + " image-item-delete");
                                this.fileList[index].listDom.setAttribute("class", clessList + " hj-list-hidden ")
                                break;
                            }
                        }
                    },
                    // 添加图片列表
                    addImgList: (id) => {
                        let file = this.privateUtils.foreachFileListToId(id);
                        this.callBack.onaddImgList(file, this);
                        let div = document.createElement('div');
                        div.className = ' hj-file-list-item '
                        let div$left = document.createElement('div');
                        let div$right = document.createElement('div');
                        let file$img = document.createElement('img');
                        let fileSize = this.privateUtils.computeFileSize(file.file.size);
                        file$img.src = './img/delete-balck.png';
                        div$left.className = ' hj-left ';
                        div$right.className = ' hj-right ';
                        div$left.innerHTML = `<span>${file.file.name}</span>`
                        div$right.innerHTML = `<span>${fileSize}</span>`;
                        div$left.addEventListener('click', () => {
                            this.event.imgLargeClick(id);
                        })
                        file$img.addEventListener('click', () => {
                            this.event.imgDeleteClick(id);
                        })
                        div$right.appendChild(file$img);
                        div.appendChild(div$left);
                        div.appendChild(div$right);
                        for (let index = 0; index < this.fileList.length; index++) {
                            if (id == this.fileList[index].id) {
                                this.fileList[index].listDom = div;
                                break;
                            }
                        }
                        this.dom.appendListDom.appendChild(div);

                    },
                }
            // 暴露的监听Api
            this.callBack = {
                    // 阻止默认自带的打开弹窗
                    onlargeClickCallBack: (img, that) => {},
                    // 自带的弹窗被关闭时的回调
                    // {event: 点击的源事件对象 imgFile: 被关闭的那张图片的全局file对象信息}
                    ondialogBeforeClose: (object) => {},
                    // 每一次添加图片列表时的回调
                    onaddImgList: (file, that) => {},
                },
                this.privateUtils = {
                    foreachFileListToId: (id) => {
                        for (let index = 0; index < this.fileList.length; index++) {
                            if (id == this.fileList[index].id) {
                                return this.fileList[index];
                            }
                        }
                    },
                    computeFileSize: (size) => {
                        let result = parseInt(size / 1024);
                        if (result < 1024) {
                            return result + '.KB';
                        } else if (result >= 1024) {
                            return parseInt(result / 1024) + ".MB";
                        }
                    },
                    // 计算弹窗的高度和长度
                    computeDialogWH: (img, dom) => {
                        let w = this.config.shadeDialogStyle[0];
                        let h = this.config.shadeDialogStyle[1];
                        let w2 = img.naturalWidth;
                        let h2 = img.naturalHeight;
                        if (w2 > window.innerWidth * 0.9) {
                            w2 = window.innerWidth * 0.7;
                            h2 = window.innerHeight * 0.7;
                        }
                        dom.style.width = w == null ? w2 + "px" : w;
                        dom.style.height = h == null ? h2 + "px" : h;
                    }
                }
        }
        var file = new File({
            maxFileLength: 2,
            maxFileSize: 1024,
            fileSuffix: ['mp4', 'mp3', 'word', 'pdf', 'ppt', 'excel', 'png', 'jpg'],
            StopDialog: false,
            showBtn: false
        });
        initHJFile(file);
        // 如果不想使用自带的弹窗，可以选择监听file对象的onlargeClickCallBack函数
        file.callBack.onlargeClickCallBack = function (img, that) {}
        file.callBack.ondialogBeforeClose = function (event) {}
        file.callBack.onaddImgList = function () {}
        // 加载初始信息，比如dom节点的添加
        function initHJFile(file) {
            console.log(file);
            let input_dom = document.getElementsByClassName('hj-file-input')[0];
            let imageItem_dom = document.getElementsByClassName('append-item')[0];
            let appendItem_dom = document.getElementsByClassName('hj-append-item')[0];
            let appendList_dom = document.getElementsByClassName('hj-file-list')[0];
            file.dom.inputDom = input_dom;
            file.dom.imageItemDom = imageItem_dom;
            file.dom.appendListDom = appendList_dom;
            if (file.config.showBtnImgStyle) {
                // 开启按钮模式
                appendItem_dom.style.display = 'none';
                let btn = document.getElementsByClassName('hj-btn-box');
                console.log(btn);
                if (btn.length != 0) {
                    btn[0].className = 'hj-btn-box';
                    btn[0].children[0].addEventListener('click', file.event.imageItemClick);
                } else {
                    console.log("没有找到btn Class");
                    throw new Error('未定义按钮模式所需的HTML')
                }
            }
            file.dom.appendItemDom = appendItem_dom;
            file.dom.imageItemDom.addEventListener('click', file.event.imageItemClick);
            file.dom.inputDom.addEventListener('change', file.event.changeLoadFile)
        }
    </script>
</body>

</html>

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