vue实现拖拽或点击上传图片

<template>
    <!--upload.vue 点击上传组件 -->
    <div class="file-selector">
        <z-btn class="selector-btn" color="primary" @click="handleUpClick">
            选择文件
        </z-btn>
        <input
            ref="input"
            class="file-selector-input"
            type="file"
            :multiple="multiple"
            :accept="accept"
            @change="handleFiles"
        />
    </div>
</template>
<script>
    import {debounce} from 'lodash/function';
    export default {
        data() {
            return {
                accept: '.jpg,.jpeg,.png,.gif',
                multiple: false,
                list: [], // 已选择的文件对象
                uploadFinished: true, // 上传状态
                startIndex: 0, // 开始上传的下标，用于追加文件
                maxSize: 10 * 1024 * 1024, //10M(size单位为byte)
                // source: this.$axios.CancelToken.source(), // axios 取消请求
            };
        },
        methods: {
            // 重置
            reset() {
                this.list = [];
                this.source.cancel();
                this.startIndex = 0;
                this.uploadFinished = true;
                this.$refs.input && (this.$refs.input.value = null);
            },
            // 调用上传功能
            handleUpClick: debounce(function () {
                // 可在此维护一个上传状态，上传过程中禁用上传按钮
                // if (!this.uploadFinished) this.$message.info('即将覆盖之前的文件~');
                this.$refs.input.click();
            }, 300),
            handleFiles(e) {
                const files = e?.target?.files;
                this.readFiles(files);
            },
            // 上传之前将文件处理为对象
            readFiles(files) {
                if (!files || files.length <= 0) {
                    return;
                }
                for (const file of files) {
                    const url = window.URL.createObjectURL(file);
                    const obj = {
                        title: file.name.replace(/(.*\/)*([^.]+).*/ig, '$2'), // 去掉文件后缀
                        url,
                        file,
                        fileType: file.type,
                        status: 0, // 状态 -> 0 等待中，1 完成， 2 正在上传，3 上传失败
                        percent: 0, // 上传进度
                    };
                    // 提前在 data 中定义 list，用来保存需要上传的文件
                    this.list.unshift(obj);
                    this.$emit('fileList', this.list);
                }
                // 在 data 中定义 startIndex 初始值为 0，上传完成后更新，用于追加上传文件
                // this.startUpload(this.startIndex);
            },

        }
    };
</script>
<style lang="scss">
.file-selector {
    .selector-btn {
        &:hover {
            background-color: rgba($color: #2976e6, $alpha: 0.8);
            transition: background 180ms;
        }
    }

    &-input {
        display: none;
    }
}
</style>

<template>
    <!-- 上传dialog -->
    <form-dialog
        v-model="$attrs.value"
        :title="title"
        persistent
        :loading="loading"
        maxWidth="600px"
        min-height='400px'
        @cancel="handleCancle"
        @confirm="handleSubmit"
    >
        <div
            class="d-flex flex-row justify-space-between">
            <z-form style='width: 260px; height: 100%;'>
                <form-item label="图片名称"  required>
                    <z-text-field
                        v-model="formData.name"
                        outlined
                        :rules="rules"
                        :disabled='disabled'
                        placeholder="请输入图片名称"
                    >
                    </z-text-field>
                </form-item>
                <form-item label="描述" required>
                    <z-textarea
                        v-model="formData.description"
                        outlined
                        :disabled='disabled'
                        placeholder="请输入描述"
                        style="resize: none;"
                    >
                    </z-textarea>
                </form-item>
            </z-form>
            <div ref="pickerArea" class="rightBox">
                <div  class="uploadInputs d-flex flex-column justify-center align-center" :class="[ dragging ? 'dragging' : '']">
                    <div ref="uploadBg"  class="uploadBg my-2"></div>
                    <upload
                        ref="uploadBtn"
                        @fileList='fileList'
                    ></upload>
                    <div class="tip  mt-2">点击上传按钮，或拖拽文件到框内上传</div>
                    <div class="tinyTip ">请选择不大于 10M 的文件</div>
                </div>
            </div>
        </div>

    </form-dialog>

</template>
<script >
    import {debounce} from 'lodash/function';
    import upload from './upload';
    import {uploadImage} from '@/wv-main-admin/apis/image';

    export default {
        components: {
            upload
        },
        props: ['dialogData'],
        data() {
            return {
                dialogFlag: '',
                title: '新增/编辑图片',
                loading: false,
                formData: {
                    name: '',
                    description: ''
                },
                disabled: false,
                rules: [v => !!v || '必填'],
                data: {},
                dragging: true, //是否拖拽
                bindDrop: false,
                fileInfo: {},
            };
        },

        mounted() {

        },
        beforeDestroy() {
            // 组件销毁前解绑拖拽事件
            try {
                const dropbox = this.$refs.pickerArea;
                dropbox.removeEventListener('drop', this.handleDrop);
                dropbox.removeEventListener('dragleave', this.handleDragLeave);
                dropbox.removeEventListener('dragover', this.handleDragOver);
                this.bindDrop = false;
            } catch (e) { console.log(e, '======我是组件销毁前解绑拖拽事件的异常'); }
        },
        methods: {
            //取消
            handleCancle() {
                // 关闭当前弹框
                this.$emit('input', false);
                // 强制组件刷新
                this.$forceUpdate();
            },
            handleSubmit: debounce(function () {
                // 上传单个文件
                const flag = this.checkMustsItem();
                if (flag) {
                    this.startUpload();
                    // 上传完成，强制组件刷新
                    this.$forceUpdate();
                }
            }, 300),

            //监听子组件的值
            fileList(data) {
                this.fileInfo = data[0];
                this.formData.name = this.fileInfo.title;
                const uploadBg = this.$refs.uploadBg;
                //改变背景图片
                uploadBg.style.backgroundImage = `url(${this.fileInfo.url})`;
            },
            bindEvents() {
                const dropbox = this.$refs.pickerArea;
                // 防止重复绑定事件，需要在 data 中初始化 bindDrop 为 false
                if (!dropbox || this.bindDrop) { return; }
                // 绑定拖拽事件，在组件销毁时解绑
                dropbox.addEventListener('drop', this.handleDrop, false);
                dropbox.addEventListener('dragleave', this.handleDragLeave);
                dropbox.addEventListener('dragover', this.handleDragOver);
                this.bindDrop = true;
            },
            // 拖拽到上传区域
            handleDragOver(e) {
                e.stopPropagation();
                e.preventDefault();
                this.dragging = true;
            },
            // 离开上传区域
            handleDragLeave(e) {
                e.stopPropagation();
                e.preventDefault();
                this.dragging = false;
            },
            // 拖拽结束
            handleDrop(e) {
                e.stopPropagation();
                e.preventDefault();
                this.dragging = false;
                const files = e.dataTransfer.files;
                // 调用 <upload/> 组件的上传功能
                this.$refs.uploadBtn && this.$refs.uploadBtn.readFiles(files);
            },
            // 上传前需要校验文件
            checkFile(index) {
                const file = this.list[index];
                // 如果文件不存在，即全部文件上传完成
                if (!file) {
                    // 上传完成，向父组件抛出 success 事件
                    this.uploadFinished = true;
                    this.$emit('success', this.list);
                    // 清空上传控件中的值，保证 change 事件能正常触发
                    this.$refs.input.value = null; this.startIndex = index > 1 ? index - 1 : 0;
                    return false;
                }

                // 校验是否已上传
                if (`${file.status}` === '1') {
                    this.startUpload(++index);
                    return false;
                }

                // 校验文件大小
                if (this.maxSize && file.file && file.file.size >= this.maxSize) {
                    this.startUpload(++index);
                    return false;
                }

                return true;
            },
            checkMustsItem() {
                if (!this.fileInfo.file) {
                    this.$message.warning('请上传文件！');
                    return false;
                } if (!this.formData.name) {
                    this.$message.warning('请输入文件名称！');
                    return false;
                } if (!this.formData.description) {
                    this.$message.warning('请输入文件描述！');
                    return false;
                }
                return true;
            },
            // 上传单个文件
            startUpload() {
                this.loading = true;
                const params = {
                    type: 'image'
                };
                this.$set(params, 'file', this.fileInfo.file);
                this.$set(params, 'name', this.formData.name);
                this.$set(params, 'description', this.formData.description);
                uploadImage(params)
                    .then(res => {
                        this.loading = false;
                        if (res.code === 0) {
                            this.$message.success('上传成功~');
                            this.$emit('refreshList', false);
                            this.$emit('input', false);
                        }
                    })
                    .catch(() => {
                        this.loading = false;
                    });
                // this.$axios({
                //     url: this.url, // 上传接口，由 props 传入
                //     method: 'post',
                //     data,
                //     withCredentials: true,
                //     cancelToken: this.source.token, // 用于取消接口请求
                //     // 进度条
                //     onUploadProgress: e => {
                //         if (fileObj.status === 1) { return; } // 已上传
                //         // 限定最大值为 99%
                //         const p = parseInt((e.loaded / e.total) * 99);
                //         if (e.total) {
                //             fileObj.status = 2; // 正在上传
                //             fileObj.percent = p; // 更新上传进度
                //         } else {
                //             fileObj.status = 3; // 上传失败
                //         }
                //     },
                // })
                //     .then(response => {
                //         if (`${response.code}` === '200') {
                //             fileObj.status = 1;
                //             fileObj.percent = 100;
                //         } else {
                //             fileObj.status = 3;
                //         }
                //     })
                //     .catch(e => {
                //         console.log(e, '====error');
                //         fileObj.status = 3;
                //     })
                //     .finally(e => {
                //         console.log(e, '====error');

                //         this.startUpload(++index);
                //     });
                // 上传完成
            },
        },
    };
</script>

<style lang='scss' scoped>
    .rightBox {
        width: 260px;
        height: 250px;
        border: 1px solid #ccc;
        margin-top: 18px;

        .uploadBg {
            width: 150px;
            height: 125px;
            background: url("../../../../assets/upload.png") no-repeat center center;
            background-size: contain;
        }
        .tip {
            font-size: 13px;
            color: rgba(0, 0, 0, 0.87);
        }
        .tinyTip {
            font-size: 12px;
            color: #8e8f9e;
        }
    }

</style>