本文实例为大家分享了vue实现放大缩小拖拽功能的具体代码，供大家参考，具体内容如下
点击放大至全屏 再次点击缩小至原始 这个弹框是基于element dialog的基础上写的
1.再utils文件夹下面新建一个directives.js (封装好了 直接拿去用）
import Vue from \'vue\';
import bigPic from \'../assets/images/bigChange.png\';
// v-dialogDrag: 弹窗拖拽属性
Vue.directive(\'dialogDrag\', {
bind(el, binding, vnode, oldVnode) {
//弹框可拉伸最小宽高
let minWidth = 400;
let minHeight = 300;
//初始非全屏
let isFullScreen = false;
//当前宽高
let nowWidth = 0;
let nowHight = 0;
//当前顶部高度
let nowMarginTop = 0;
//获取弹框头部（这部分可双击全屏）
const dialogHeaderEl = el.querySelector(\'.el-dialog__header\');
//弹窗
const dragDom = el.querySelector(\'.el-dialog\');
// 全屏按钮
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\');
//给弹窗加上overflow auto；不然缩小时框内的标签可能超出dialog；
dragDom.style.overflow = \"auto\";
//清除选择头部文字效果
//dialogHeaderEl.onselectstart = new Function(\"return false\");
//头部加上可拖动cursor
dialogHeaderEl.style.cursor = \'move\';
// 获取原有属性 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) => {
// 鼠标按下，计算当前元素距离可视区的距离
const disX = e.clientX - dialogHeaderEl.offsetLeft;
const disY = e.clientY - dialogHeaderEl.offsetTop;
// 获取到的值带px 正则匹配替换
let styL, styT;
// 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为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) {
// 通过事件委托，计算移动的距离
const l = e.clientX - disX;
const t = e.clientY - disY;
// 移动当前元素
dragDom.style.left = `${l + styL}px`;
dragDom.style.top = `${t + styT}px`;
//将此时的位置传出去
//binding.value({x:e.pageX,y:e.pageY})
};
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
};
}
dialogHeaderEl.onmousedown = moveDown;
//双击头部全屏效果
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;
//判断点击的位置是不是为头部
if (clientX > EloffsetLeft && clientX < EloffsetLeft + elW && clientY > EloffsetTop && clientY < EloffsetTop + 100) {
//如果是头部在此就不做任何动作，以上有绑定dialogHeaderEl.onmousedown = moveDown;
} else {
document.onmousemove = function (e) {
e.preventDefault(); // 移动时禁用默认事件
//左侧鼠标拖拽位置
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\';
}
}
}
//右侧鼠标拖拽位置
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\';
}
}
//底部鼠标拖拽位置
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\';
}
}
};
//拉伸结束
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
};
}
}
}
}
})
2.再main.js引入
import \'./utils/directives.js\';
3.页面直接以自定义属性名进行使用 ( v-dialogDrag )
<el-dialog
v-dialogDrag
title=\"用户信息\"
: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=\"性别\" width=\"80\"></el-table-column>
<el-table-column prop=\"idCard\" label=\"身份证号\" min-width=\"120\" show-overflow-tooltip></el-table-column>
<el-table-column prop=\"mobile\" label=\"联系电话\" width=\"150\"></el-table-column>
<el-table-column prop=\"censusAreaName\" label=\"户籍区划\" min-width=\"120\" show-overflow-tooltip></el-table-column>
<el-table-column prop=\"censusAddr\" label=\"户籍地址\" 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\">选择</span>
</template>
</el-table-column>
</el-table>
</div>
</el-dialog>
4.CSS也一并奉上 （注意查看directives.js里面的标签元素）
.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内容，希望对大家的学习有所帮助，也希望大家多多支持。
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