vue實現放大縮小拖拽功能

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本文實例為大傢分享瞭vue實現放大縮小拖拽功能的具體代碼，供大傢參考，具體內容如下

點擊放大至全屏 再次點擊縮小至原始  這個彈框是基於element dialog的基礎上寫的 

1.再utils文件夾下面新建一個directives.js  (封裝好瞭 直接拿去用）

import Vue from 'vue';
import bigPic from '../assets/images/bigChange.png';
// v-dialogDrag: 彈窗拖拽屬性
Vue.directive('dialogDrag', {
  bind(el, binding, vnode, oldVnode) {
    //彈框可拉伸最小寬高
    let minWidth = 400;
 
    let minHeight = 300;
 
    //初始非全屏
 
    let isFullScreen = false;
 
    //當前寬高
 
    let nowWidth = 0;
 
    let nowHight = 0;
 
    //當前頂部高度
 
    let nowMarginTop = 0;
 
    //獲取彈框頭部（這部分可雙擊全屏）
 
    const dialogHeaderEl = el.querySelector('.el-dialog__header');
 
    //彈窗
 
    const dragDom = el.querySelector('.el-dialog');
 
    // 全屏按鈕
 
    dialogHeaderEl.insertAdjacentHTML('beforeEnd', '<div class="bigbtn"><div class="changeBig"></div><div class="changeSmall"></div></div>');
 
    const bigBtn = el.querySelector('.bigbtn');
 
    const changeBig = el.querySelector('.changeBig');
 
    const changeSmall = el.querySelector('.changeSmall');
    //給彈窗加上overflow auto；不然縮小時框內的標簽可能超出dialog；
 
    dragDom.style.overflow = "auto";
 
    //清除選擇頭部文字效果
 
    //dialogHeaderEl.onselectstart = new Function("return false");
 
    //頭部加上可拖動cursor
 
    dialogHeaderEl.style.cursor = 'move';
 
    // 獲取原有屬性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
 
    const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);
 
    let moveDown = (e) => {
      // 鼠標按下，計算當前元素距離可視區的距離
 
      const disX = e.clientX - dialogHeaderEl.offsetLeft;
 
      const disY = e.clientY - dialogHeaderEl.offsetTop;
 
      // 獲取到的值帶px 正則匹配替換
 
      let styL, styT;
 
      // 註意在ie中 第一次獲取到的值為組件自帶50% 移動之後賦值為px
 
      if (sty.left.includes('%')) {
 
        styL = +document.body.clientWidth * (+sty.left.replace(/\%/g, '') / 100);
 
        styT = +document.body.clientHeight * (+sty.top.replace(/\%/g, '') / 100);
 
      } else {
 
        styL = +sty.left.replace(/\px/g, '');
 
        styT = +sty.top.replace(/\px/g, '');
 
      };
 
      document.onmousemove = function (e) {
        // 通過事件委托，計算移動的距離
 
        const l = e.clientX - disX;
 
        const t = e.clientY - disY;
 
        // 移動當前元素
 
        dragDom.style.left = `${l + styL}px`;
 
        dragDom.style.top = `${t + styT}px`;
 
        //將此時的位置傳出去
 
        //binding.value({x:e.pageX,y:e.pageY})
 
      };
 
      document.onmouseup = function (e) {
 
        document.onmousemove = null;
 
        document.onmouseup = null;
 
      };
 
    }
 
    dialogHeaderEl.onmousedown = moveDown;
 
    //雙擊頭部全屏效果
 
    bigBtn.onclick = (e) => {
      if (isFullScreen == false) {
 
        changeBig.style.display = 'none';
 
        changeSmall.style.display = 'block';
 
        nowHight = dragDom.clientHeight;
 
        nowWidth = dragDom.clientWidth;
 
        nowMarginTop = dragDom.style.marginTop;
 
        dragDom.style.left = 0;
 
        dragDom.style.top = 0;
 
        dragDom.style.height = "100VH";
 
        dragDom.style.width = "100VW";
 
        dragDom.style.marginTop = 0;
 
        isFullScreen = true;
 
        dialogHeaderEl.style.cursor = 'initial';
 
        dialogHeaderEl.onmousedown = null;
 
      } else {
 
        changeBig.style.display = 'block';
 
        changeSmall.style.display = 'none';
 
        dragDom.style.height = "auto";
 
        dragDom.style.width = nowWidth + 'px';
 
        dragDom.style.marginTop = nowMarginTop;
 
        isFullScreen = false;
 
        dialogHeaderEl.style.cursor = 'move';
 
        dialogHeaderEl.onmousedown = moveDown;
 
      }
 
    }
 
    dragDom.onmousemove = function (e) {
      // console.log(dialogHeaderEl,dragDom.querySelector('.el-dialog__body'), 123);
      let moveE = e;
 
      if (e.clientX > dragDom.offsetLeft + dragDom.clientWidth - 10 || dragDom.offsetLeft + 10 > e.clientX) {
 
        dragDom.style.cursor = 'w-resize';
 
      } else if (el.scrollTop + e.clientY > dragDom.offsetTop + dragDom.clientHeight - 10) {
 
        dragDom.style.cursor = 's-resize';
 
      } else {
 
        dragDom.style.cursor = 'default';
 
        dragDom.onmousedown = null;
 
      }
 
      dragDom.onmousedown = (e) => {
 
        const clientX = e.clientX;
 
        const clientY = e.clientY;
 
        let elW = dragDom.clientWidth;
 
        let elH = dragDom.clientHeight;
 
        let EloffsetLeft = dragDom.offsetLeft;
 
        let EloffsetTop = dragDom.offsetTop;
 
        dragDom.style.userSelect = 'none';
 
        let ELscrollTop = el.scrollTop;
 
        //判斷點擊的位置是不是為頭部
 
        if (clientX > EloffsetLeft && clientX < EloffsetLeft + elW && clientY > EloffsetTop && clientY < EloffsetTop + 100) {
 
          //如果是頭部在此就不做任何動作，以上有綁定dialogHeaderEl.onmousedown = moveDown;
 
        } else {
 
          document.onmousemove = function (e) {
 
            e.preventDefault(); // 移動時禁用默認事件
 
            //左側鼠標拖拽位置
 
            if (clientX > EloffsetLeft && clientX < EloffsetLeft + 10) {
 
              //往左拖拽
 
              if (clientX > e.clientX) {
 
                dragDom.style.width = elW + (clientX - e.clientX) * 2 + 'px';
 
              }
 
              //往右拖拽
 
              if (clientX < e.clientX) {
 
                if (dragDom.clientWidth < minWidth) {
 
                } else {
 
                  dragDom.style.width = elW - (e.clientX - clientX) * 2 + 'px';
 
                }
 
              }
 
            }
 
            //右側鼠標拖拽位置
 
            if (clientX > EloffsetLeft + elW - 10 && clientX < EloffsetLeft + elW) {
 
              //往左拖拽
 
              if (clientX > e.clientX) {
 
                if (dragDom.clientWidth < minWidth) {
 
                } else {
 
                  dragDom.style.width = elW - (clientX - e.clientX) * 2 + 'px';
 
                }
 
              }
 
              //往右拖拽
 
              if (clientX < e.clientX) {
 
                dragDom.style.width = elW + (e.clientX - clientX) * 2 + 'px';
 
              }
 
            }
 
            //底部鼠標拖拽位置
 
            if (ELscrollTop + clientY > EloffsetTop + elH - 20 && ELscrollTop + clientY < EloffsetTop + elH) {
 
              //往上拖拽
 
              if (clientY > e.clientY) {
 
                if (dragDom.clientHeight < minHeight) {
 
                } else {
 
                  dragDom.style.height = elH - (clientY - e.clientY) * 2 + 'px';
 
                }
 
              }
 
              //往下拖拽
 
              if (clientY < e.clientY) {
 
                dragDom.style.height = elH + (e.clientY - clientY) * 2 + 'px';
 
              }
 
            }
 
          };
 
          //拉伸結束
 
          document.onmouseup = function (e) {
 
            document.onmousemove = null;
 
            document.onmouseup = null;
 
          };
 
        }
 
      }
 
    }
  }
})

2.再main.js引入

import './utils/directives.js';

3.頁面直接以自定義屬性名進行使用  (  v-dialogDrag  )

<el-dialog
     v-dialogDrag
      title="用戶信息"
      :visible.sync="dialogVisible"
      width="50%"
      :close-on-click-modal="false"
      :before-close="handleClose">
      <div>
        <el-table :data="phoneData" style="width: 100%">
          <el-table-column prop="fullName" label="姓名" width="100"></el-table-column>
          <el-table-column prop="sex" label="性別" width="80"></el-table-column>
          <el-table-column prop="idCard" label="身份證號" min-width="120" show-overflow-tooltip></el-table-column>
          <el-table-column prop="mobile" label="聯系電話" width="150"></el-table-column>
          <el-table-column prop="censusAreaName" label="戶籍區劃" min-width="120" show-overflow-tooltip></el-table-column>
          <el-table-column prop="censusAddr" label="戶籍地址" min-width="100" show-overflow-tooltip></el-table-column>
          <el-table-column label="操作" width="120" fixed="right" align="center">
            <template slot-scope="{row}">
              <span @click="chooseInfor(row.id)" class="table-btn">選擇</span>
            </template>
          </el-table-column>
        </el-table>
      </div>
</el-dialog>

4.CSS也一並奉上 （註意查看directives.js裡面的標簽元素）

.changeBig {
    width: 20px;
    height: 20px;
    background: url("../assets/images/bigChange.png") no-repeat center;
    background-size: 100% 100%;
    cursor: pointer;
    position: absolute;
    top: 14px;
    right: 60px;
}
.changeSmall {
    width: 20px;
    height: 20px;
    background: url("../assets/images/smallChange.png") no-repeat center;
    background-size: 100% 100%;
    cursor: pointer;
    position: absolute;
    top: 14px;
    right: 60px;
    display: none;
}

以上就是本文的全部內容，希望對大傢的學習有所幫助，也希望大傢多多支持WalkonNet。

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