前端手写文件上传；使用input实现文件拖动上传

使用input实现文件拖动上传

vue2代码：

<template><div><div class="drop-area" @dragenter="highlight" @dragover="highlight" @dragleave="unhighlight" @drop="handleDrop"@click="handleClick">将文件拖拽到此处或者点击上传<input type="file" ref="fileInput"  accept=".png,.jpg,.jpeg,.pdf" @change="handleFiles" multiple style="display: none;"></div><ul v-if="fileList.length"><li v-for="(file, index) in fileList" :key="index">{{ file.name }}</li></ul><pre>{{ fileList }}</pre></div>
</template><script>
export default {data() {return {fileList: []};},methods: {highlight(e) {e.preventDefault();e.stopPropagation();e.target.classList.add('hover');},unhighlight(e) {e.target.classList.remove('hover');},handleDrop(e) {e.preventDefault();e.stopPropagation();this.unhighlight(e);const files = e.dataTransfer.files;console.log('拖拽得到List', e);// this.handleFiles(files);for (let i = 0; i < files.length; i++) {this.fileList.push({...files[i],name: files[i].name,size: files[i].size,type: files[i].type});}this.uploadFile()},handleClick() {this.$refs.fileInput.click();},handleFiles(e) {console.log(11, e);const files = e.target.files || e;for (let i = 0; i < files.length; i++) {this.fileList.push({...files[i],name: files[i].name,size: files[i].size,type: files[i].type});}this.uploadFile()},// 上传文件uploadFile() {console.log('this.fileList', this.fileList);}}
};
</script><style>
.drop-area {width: 300px;height: 200px;border: 2px dashed #ccc;border-radius: 10px;text-align: center;line-height: 200px;cursor: pointer;
}.drop-area.hover {border-color: #11716f;
}.drop-area:hover {border-color: #11716f;
}
</style>

vue3代码：

<template><div><div class="drop-area" @dragenter="highlight" @dragover="highlight" @dragleave="unhighlight" @drop="handleDrop"@click="handleClick">将文件拖拽到此处或者点击上传<input type="file" ref="fileInput" accept=".png,.jpg,.jpeg,.pdf" @change="handleFiles" multiple style="display: none;"></div><ul v-if="fileList.length"><li v-for="(file, index) in fileList" :key="index">{{ file.name }}</li></ul><pre>{{ fileList }}</pre></div>
</template><script>
import { ref } from 'vue';export default {setup() {const fileList = ref([]);const fileInput = ref(null);const highlight = (e) => {e.preventDefault();e.stopPropagation();e.target.classList.add('hover');};const unhighlight = (e) => {e.target.classList.remove('hover');};const handleDrop = (e) => {e.preventDefault();e.stopPropagation();unhighlight(e);const files = e.dataTransfer.files;for (let i = 0; i < files.length; i++) {fileList.value.push({...files[i],name: files[i].name,size: files[i].size,type: files[i].type});}uploadFile();};const handleClick = () => {console.log(fileInput.value);fileInput.value.click(); // 使用 ref 的 value 直接访问 DOM 元素};const handleFiles = (e) => {const files = e.target.files || e;for (let i = 0; i < files.length; i++) {fileList.value.push({...files[i],name: files[i].name,size: files[i].size,type: files[i].type});}uploadFile();};// 上传文件const uploadFile = () => {console.log('fileList', fileList.value);};return {fileList,highlight,unhighlight,handleDrop,handleClick,handleFiles,fileInput};}
};
</script><style>
.drop-area {width: 440px;height: 185px;border: 1px dashed #dcdfe6;border-radius: 6px;text-align: center;line-height: 185px;cursor: pointer;
}.drop-area.hover {border-color: #11716f;
}.drop-area:hover {border-color: #11716f;
}
</style>