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

牧码岛2023-12-24 12:14

vue2+html5+原生dom+原生JavaScript实现跨区域拖放

关键代码

javascript 复制代码 
// 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

javascript 复制代码 
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 = false
		let newflag = false

		if (oldIndex === -1) {
			oldflag = true
			oldIndex = this.list.indexOf(this.oldItem);
		}

		if (newIndex === -1) {
			newflag = true
			newIndex = 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

html 复制代码 
<!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

javascript 复制代码 
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 = this
            if (this.is_moving) {
                event.target.style.left = endx + 'px';
                event.target.style.top = endy + 'px';
            }
        },
        mouseup: function (e) {
            this.is_moving = false;
        }
    }
});

css

css 复制代码 
.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

html 复制代码 
<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

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

二次封装上传组件

html 复制代码 
<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

html 复制代码 
<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

javascript 复制代码 
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

html 复制代码 
<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

javascript 复制代码 
(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'));
})();
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