web前端之拖拽API、vue3实现图片上传拖拽排序、拖放、投掷、复制、若依、vuedraggable

本文主要是介绍web前端之拖拽API、vue3实现图片上传拖拽排序、拖放、投掷、复制、若依、vuedraggable，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

vue2+html5+原生dom+原生JavaScript实现跨区域拖放

关键代码

// 放
function drop(ev) {let data = ev.dataTransfer.getData("Text"),i = ev.path[1].getAttribute("i"),text = document.getElementById(data).cloneNode(true).innerText.trim();if (i == null) return alert('请放置在文件名上');if (app.fileS[i].divs.includes(text)) return alert('不能放重复数据');app.fileS[i].divs.push(text);for (let is = 0; is < app.fileS.length; is++) {if (i == is) {app.fileS[is].isShow = true;} else {app.fileS[is].isShow = false;}}
}

完整代码

gitee(码云) - mj01分支 - copyDragAndDrop 文件

vue2实现跨区域拖放

关键代码

dragend(item) {console.log(item);if (this.oldItem != this.newItem) {let oldIndex = this.List.indexOf(this.oldItem);let newIndex = this.List.indexOf(this.newItem);let oldflag = falselet newflag = falseif (oldIndex === -1) {oldflag = trueoldIndex = this.list.indexOf(this.oldItem);}if (newIndex === -1) {newflag = truenewIndex = this.list.indexOf(this.newItem);}let newList = [...this.List]; // 中间数组，用于交换两个节点let newlist = [...this.list]; // 中间数组，用于交换两个节点if (!oldflag) {newList.splice(oldIndex, 1);} else {newlist.splice(oldIndex, 1);}if (!newflag) {newList.splice(newIndex, 0, this.oldItem);} else {newlist.splice(newIndex, 0, this.oldItem);}// 删除老的节点// newList.splice(oldIndex, 1);// // 在列表目标位置增加新的节点// newList.splice(newIndex, 0, this.oldItem);// // 更新this.List，触发transition-group的动画效果this.List = [...newList];this.list = [...newlist];}
}

完整代码

gitee(码云) - mj01分支 - dragAndDrop 文件

vue2+mousedown实现全屏拖动，全屏投掷

html

<!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>鼠标滑动</title><link rel="stylesheet" href="./index.css">
</head><body><div id="app"><div class="ctn ctn1"><div class="sub sub1" v-for="(site, index) in list1"><div class="dragCtn fixed" @mousedown="mousedown(site, $event)"@mousemove.prevent='mousemove(site, $event)' @mouseup='mouseup(site, $event)'>{{ site.name }}</div></div></div><div class="ctn ctn2"><div class="sub sub2" v-for="(site, index) in list2"><div class="dragCtn">{{ index }} : {{ site.name }}</div></div></div></div><script src="/node_modules/vue/dist/vue.js"></script><script src="./index.js"></script>
</body></html>

JavaScript

new Vue({el: '#app',data: {list1: [{ name: '拖动我', index: 0 }],list2: [{ name: 'a', index: 0 }, { name: 'b', index: 1 }, { name: 'c', index: 2 }, { name: 'd', index: 3 }],vm: '',sb_bkx: 0,sb_bky: 0,is_moving: false},methods: {mousedown: function (site, event) {var startx = event.x;var starty = event.y;this.sb_bkx = startx - event.target.offsetLeft;this.sb_bky = starty - event.target.offsetTop;this.is_moving = true;},mousemove: function (site, event) {var endx = event.x - this.sb_bkx;var endy = event.y - this.sb_bky;var _this = thisif (this.is_moving) {event.target.style.left = endx + 'px';event.target.style.top = endy + 'px';}},mouseup: function (e) {this.is_moving = false;}}
});

css

.ctn {line-height: 50px;cursor: pointer;font-size: 20px;text-align: center;float: left;
}.sub:hover {background: #e6dcdc;color: white;width: 100px;
}.ctn1 {border: 1px solid green;width: 100px;
}.ctn2 {border: 1px solid black;width: 100px;margin-left: 50px;
}.fixed {width: 100px;height: 100px;position: fixed;background: red;left: 10px;top: 10px;cursor: move;
}

vue3+element-plus+vuedraggable实现图片上传拖拽排序

前言

安装对应的vuedraggable组件
npm install vuedraggable@4.1.0 --save
package.json文件中记录对应的版本号为: "vuedraggable": "4.1.0"，这里要注意咯！！！克隆项目的时候这里的4.1.0可能会变为^4.1.0，一定要改为4.1.0；如果不是可以先卸载然后安装正确的版本即可。
如果版本不对会报错，并且不能运行。

本案例基于若依vue3前后端分离项目做二次开发
若依自带二次封装element-plus图片上传组件，但是没有实现拖拽排序功能。
于是又自己封装了一个ImageUploadDraggable图片上传组件，此组件基于若依自带的图片上传组件的基础上进行再次封装。
组件正常引入即可，可以全局引入或局部引入，引入方式跟我们自定的组件一样。

html

<el-form-item label="图片" class="ws_n"><image-upload-draggable v-model="dialogForm.images" :limit="5"></image-upload-draggable>
</el-form-item>

JavaScript

let info = reactive({dialogForm: {// 图片images: []}}),{dialogForm} = toRefs(info);

二次封装上传组件

<template><div class="component-upload-image"><ul class="el-upload-list el-upload-list--picture-card"><vue-draggable-next v-model="fileList"><li v-for="(item, index) in fileList" :key="item.index" class="el-upload-list__item is-success animated"><img :src="item.url" alt="" class="el-upload-list__item-thumbnail" /><i class="el-icon-close"></i><span class="el-upload-list__item-actions"><!-- 预览 --><span class="el-upload-list__item-preview" @click="handlePictureCardPreviewFileDetail(item)"><el-icon><zoom-in></zoom-in></el-icon></span><!-- 删除 --><span class="el-upload-list__item-delete" @click="handleRemoveFileDetail(index)"><el-icon><delete></delete></el-icon></span></span></li></vue-draggable-next></ul><el-upload multiple :action="uploadImgUrl" list-type="picture-card" :on-success="handleUploadSuccess":before-upload="handleBeforeUpload" :limit="limit" :on-error="handleUploadError" :on-exceed="handleExceed"ref="imageUpload" :show-file-list="false" :headers="headers" :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</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 { VueDraggableNext } from "vue-draggable-next";
import { getToken } from "@/utils/auth";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;
// 上传的图片服务器地址
const uploadImgUrl = ref(import.meta.env.VITE_APP_BASE_API + "/file/upload");
const headers = ref({Authorization: "Bearer " + getToken(),appid: import.meta.env.VITE_APP_ID,
});
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") {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 (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++;
}// 文件个数超出
function handleExceed() {proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}// 上传成功回调
function handleUploadSuccess(res, file) {if (res.code === 0) {uploadList.value.push({ name: res.data.url, url: res.data.url });uploadedSuccessfully();} else {number.value--;proxy.$modal.closeLoading();proxy.$modal.msgError(res.msg);proxy.$refs.imageUpload.handleRemove(file);uploadedSuccessfully();}
}function handlePictureCardPreviewFileDetail(file) {dialogImageUrl.value = file.url;dialogVisible.value = true;
}// 删除
function handleRemoveFileDetail(index) {fileList.value.splice(index, 1);
}// 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();
}// 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) : "";
}
</script><style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {display: none;
}
</style>

vue2+transition-group实现拖动排序

html

<transition-group id='app' name="drog" tag="ul"><div draggable="true" v-for="(item, index) in lists" @dragstart="dragStart($event, index)" @dragover="allowDrop" @drop="drop($event, index)" v-bind:key="item">{{item}}</div>
</transition-group>

JavaScript

new Vue({el: '#app',data: {lists: ['1: apple', '2: banana', '3: orange', '4: melon']},methods: {// 取消默认行为allowDrop(e){e.preventDefault();},// 开始拖动dragStart(e, index){let tar = e.target;e.dataTransfer.setData('Text', index);if (tar.tagName.toLowerCase() == 'li') {// console.log('drag start')// console.log('drag Index: ' + index)}},// 放置drop(e, index){this.allowDrop(e);// console.log('drop index: ' + index);//使用一个新数组重新排序后赋给原变量let arr = this.lists.concat([]),dragIndex = e.dataTransfer.getData('Text');temp = arr.splice(dragIndex, 1);arr.splice(index, 0, temp[0]);// console.log('sort');this.lists = arr;}}
});

原生拖拽排序

html

<ul id="idUl"><li class="m_36 ta_c bc_87ceeb fs_68">1</li><li class="m_36 ta_c bc_87ceeb fs_68">2</li><li class="m_36 ta_c bc_87ceeb fs_68">3</li><li class="m_36 ta_c bc_87ceeb fs_68">4</li><li class="m_36 ta_c bc_87ceeb fs_68">5</li>
</ul>

JavaScript

(function () {let ulList = document.querySelector('#idUl'),liList = document.querySelectorAll('li'),currentLi = undefined;liList.forEach(item => item.draggable = "true");ulList.addEventListener('dragstart', (e) => {e.dataTransfer.effectAllowed = 'move';currentLi = e.target;setTimeout(() => currentLi.classList.add('bc_transparent color_transparent'), 0);});ulList.addEventListener('dragenter', (e) => {e.preventDefault();if (e.target === currentLi || e.target === ulList) return false;let liArray = Array.from(ulList.childNodes),currentIndex = liArray.indexOf(currentLi),targetindex = liArray.indexOf(e.target)if (currentIndex < targetindex) {ulList.insertBefore(currentLi, e.target.nextElementSibling);} else {ulList.insertBefore(currentLi, e.target);}});ulList.addEventListener('dragover', (e) => e.preventDefault());ulList.addEventListener('dragend', (e) => currentLi.classList.remove('bc_transparent color_transparent'));
})();