Dialog 对话框 可拖拽

1.在 utils 中新建 dialog.js 文件

Vue.directive('dialogDrag', {
    bind(el, binding, vnode, oldVnode) {
        const dialogHeaderEl = el.querySelector('.el-dialog__header');
        const dragDom = el.querySelector('.el-dialog');
        //dialogHeaderEl.style.cursor = 'move';
        dialogHeaderEl.style.cssText += ';cursor:move;'
        // dragDom.style.cssText += ';top:0px;'
        // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
        const sty = (function() {
            if (window.document.currentStyle) {
                return (dom, attr) =>dom.currentStyle[attr];
            } else {
                return (dom, attr) =>getComputedStyle(dom, false)[attr];
            }
        })()

        dialogHeaderEl.onmousedown = (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;

            const screenWidth = document.body.clientWidth; // body当前宽度
            const screenHeight = document.documentElement.clientHeight; // 可见区域高度(应为body高度，可某些环境下无法获取) 

            const dragDomWidth = dragDom.offsetWidth; // 对话框宽度
            const dragDomheight = dragDom.offsetHeight; // 对话框高度

            const minDragDomLeft = (dragDom.offsetLeft-dragDomWidth/2);
            const maxDragDomLeft = screenWidth - minDragDomLeft - dragDomWidth;
            const minDragDomTop = (dragDom.offsetTop-dragDomheight/2);
            const maxDragDomTop = screenHeight - minDragDomTop-40;

            // 获取到的值带px 正则匹配替换
            let styL = sty(dragDom, 'left');
            let styT = sty(dragDom, 'top');

            // 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 (styL.includes('%')) {
                styL = +document.body.clientWidth * (+styL.replace(/\%/g, '') / 100);
                styT = +document.body.clientHeight * (+styT.replace(/\%/g, '') / 100);
            } else {
                styL = +styL.replace(/px/g, '');
                styT = +styT.replace(/px/g, '');
            };

            document.onmousemove = function(e) {
                // 通过事件委托，计算移动的距离 
                let left = e.clientX - disX;
                let top = e.clientY - disY;
                // 边界处理
                if (-(left) > minDragDomLeft) {
                    left = -(minDragDomLeft);
                }
                else if (left > maxDragDomLeft) {
                    left = maxDragDomLeft;
                }
                if (-(top) > minDragDomTop) {
                    top = -(minDragDomTop);
                }
                else if (top > maxDragDomTop) {
                    top = maxDragDomTop;
                }
                // 移动当前元素  
                dragDom.style.cssText += `;left:${left + styL}px;top:${top + styT}px;`;
            };

            document.onmouseup = function(e) {
                document.onmousemove = null;
                document.onmouseup = null;
            };
        }
    }
})

2、main.js中导入

import draggable from 'vuedraggable';
Vue.use(draggable);

3、使用 el-dialog 的地方加入 v-dialogDrag

<el-dialog 
    v-dialogDrag 
    :title="dialogTitle" 
    :show-close="false" 
    :close-on-click-modal="false"
    :close-on-press-escape="false" 
    :visible.sync="showDialog" 
    >
</el-dialog>

注：原创 小太阳...