若依vue3实现粘贴上传图片

若依的上传控件只支持选择文件上传，但是这样步骤过于繁琐，不方便使用

今天我们使用的是vue3版本的若依，我们通过修改若依组件ImageUpload来实现粘贴上传

代码不做多的解释，我们直接上代码，复制替换过去就行

<template>
    <div class="component-upload-image" @paste="handlePasteUpload">
        <el-upload drag multiple :action="uploadImgUrl" list-type="picture-card" :on-success="handleUploadSuccess"
            :before-upload="handleBeforeUpload" :limit="limit" :on-error="handleUploadError" :on-exceed="handleExceed"
            ref="imageUpload" :before-remove="handleDelete" :show-file-list="true" :headers="headers"
            :file-list="fileList" :on-preview="handlePictureCardPreview" :class="{ hide: fileList.length >= limit }">
            <el-icon class="avatar-uploader-icon">
                <plus />
            </el-icon>
        </el-upload>
        <!-- 上传提示 -->
        <div class="el-upload__tip" v-if="showTip">
            请上传
            <template v-if="fileSize">
                大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
            </template>
            <template v-if="fileType">
                格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
            </template>
            的文件<br />
            支持拖拽上传,以及粘贴上传(粘贴上传需要点击页面截图的空白区域)
        </div>

        <el-dialog v-model="dialogVisible" title="预览" width="800px" append-to-body>
            <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
        </el-dialog>
    </div>
</template>

<script setup>
import { getToken } from "@/utils/auth";
import { isExternal } from "@/utils/validate";

const props = defineProps({
    modelValue: [String, Object, Array],
    // 图片数量限制
    limit: {
        type: Number,
        default: 5,
    },
    // 大小限制(MB)
    fileSize: {
        type: Number,
        default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
        type: Array,
        default: () => ["png", "jpg", "jpeg"],
    },
    // 是否显示提示
    isShowTip: {
        type: Boolean,
        default: true
    },
});

const { proxy } = getCurrentInstance();
const emit = defineEmits();
const number = ref(0);
const uploadList = ref([]);
const dialogImageUrl = ref("");
const dialogVisible = ref(false);
const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadImgUrl = ref(import.meta.env.VITE_APP_BASE_API + "/common/upload"); // 上传的图片服务器地址
const headers = ref({ Authorization: "Bearer " + getToken() });
const fileList = ref([]);
const showTip = computed(
    () => props.isShowTip && (props.fileType || props.fileSize)
);

watch(() => props.modelValue, val => {
    if (val) {
        // 首先将值转为数组
        const list = Array.isArray(val) ? val : props.modelValue.split(",");
        // 然后将数组转为对象数组
        fileList.value = list.map(item => {
            if (typeof item === "string") {
                if (item.indexOf(baseUrl) === -1 && !isExternal(item)) {
                    item = { name: baseUrl + item, url: baseUrl + item };
                } else {
                    item = { name: item, url: item };
                }
            }
            return item;
        });
    } else {
        fileList.value = [];
        return [];
    }
}, { deep: true, immediate: true });

// 上传前loading加载
function handleBeforeUpload(file) {

    let isImg = false;
    if (props.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
            fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = props.fileType.some(type => {
            if (file.type.indexOf(type) > -1) return true;
            if (fileExtension && fileExtension.indexOf(type) > -1) return true;
            return false;
        });
    } else {
        isImg = file.type.indexOf("image") > -1;
    }
    if (!isImg) {
        proxy.$modal.msgError(`文件格式不正确，请上传${props.fileType.join("/")}图片格式文件!`);
        return false;
    }
    if (file.name.includes(',')) {
        proxy.$modal.msgError('文件名不正确，不能包含英文逗号!');
        return false;
    }
    if (props.fileSize) {
        const isLt = file.size / 1024 / 1024 < props.fileSize;
        if (!isLt) {
            proxy.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
            return false;
        }
    }
    proxy.$modal.loading("正在上传图片，请稍候...");
    number.value++;
    return true;
}

// 文件个数超出
function handleExceed() {
    proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传成功回调
function handleUploadSuccess(res, file) {
    if (res.code === 200) {
        uploadList.value.push({ name: res.fileName, url: res.fileName });
        uploadedSuccessfully();
    } else {
        number.value--;
        proxy.$modal.closeLoading();
        proxy.$modal.msgError(res.msg);
        proxy.$refs.imageUpload.handleRemove(file);
        uploadedSuccessfully();
    }
}

// 删除图片
function handleDelete(file) {
    const findex = fileList.value.map(f => f.name).indexOf(file.name);
    if (findex > -1 && uploadList.value.length === number.value) {
        fileList.value.splice(findex, 1);
        emit("update:modelValue", listToString(fileList.value));
        return false;
    }
}

// 上传结束处理
function uploadedSuccessfully() {
    if (number.value > 0 && uploadList.value.length === number.value) {
        fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value);
        uploadList.value = [];
        number.value = 0;
        emit("update:modelValue", listToString(fileList.value));
        proxy.$modal.closeLoading();
    }
}

// 上传失败
function handleUploadError() {
    proxy.$modal.msgError("上传图片失败");
    proxy.$modal.closeLoading();
}

// 预览
function handlePictureCardPreview(file) {
    dialogImageUrl.value = file.url;
    dialogVisible.value = true;
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
    let strs = "";
    separator = separator || ",";
    for (let i in list) {
        if (undefined !== list[i].url && list[i].url.indexOf("blob:") !== 0) {
            strs += list[i].url.replace(baseUrl, "") + separator;
        }
    }
    return strs != "" ? strs.substr(0, strs.length - 1) : "";
}

function handlePasteUpload(event) {
    const clipboardData = event.clipboardData || window.clipboardData;
    if (!clipboardData) return;

    // 获取粘贴内容中的文件
    const items = clipboardData.items;
    for (let i = 0; i < items.length; i++) {
        const item = items[i];
        if (item.kind === 'file' && item.type.startsWith('image/')) {
            const file = item.getAsFile();
            if (file) {
                uploadPastedImage(file);
            }
        }
    }
}

// 上传粘贴的图片文件
function uploadPastedImage(file) {
    // 调用 before-upload 逻辑检查
    if (!handleBeforeUpload(file)) return;

    // 创建文件上传表单
    const formData = new FormData();
    formData.append('file', file);

    // 手动上传文件
    fetch(uploadImgUrl.value, {
        method: 'POST',
        headers: {
            Authorization: headers.value.Authorization,
        },
        body: formData,
    })
        .then(response => response.json())
        .then(res => {
            if (res.code === 200) {
                // 上传成功的回调
                handleUploadSuccess(res, { name: file.name, url: res.fileName });
            } else {
                handleUploadError();
            }
        })
        .catch(() => {
            handleUploadError();
        });
}

</script>

<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
    display: none;
}

.component-upload-image {
    position: relative;
    outline: none;

    &:focus {
        border: 2px dashed #409eff;
    }
}
</style>

还是简单描述一下方法吧。通过监听粘贴内容