使用vue 指令怎么实现气泡提示效果？很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
气泡指令
import { on , off , once, contains, elemOffset, position, addClass, removeClass } from '../utils/dom';
import Vue from 'vue'
const global = window;
const doc = global.document;
const top = 15;
export default {
name : 'jc-tips' ,
bind (el , binding , vnode) {
// 确定el 已经在页面里 为了获取el 位置信信
Vue.nextTick(() => {
const { context } = vnode;
const { expression } = binding;
// 气泡元素根结点
const fWarpElm = doc.createElement('div');
// handleFn 气泡里的子元素（自定义）
const handleFn = binding.expression && context[expression] || (() => '');
const createElm = handleFn();
fWarpElm.className = 'hide jc-tips-warp';
fWarpElm.appendChild(createElm);
doc.body.appendChild(fWarpElm);
// 给el 绑定元素待其他操作用
el._tipElm = fWarpElm;
el._createElm = createElm;
// 鼠标放上去的 回调函数
el._tip_hover_fn = function(e) {
// 删除节点函数
removeClass(fWarpElm, 'hide');
fWarpElm.style.opacity = 0;
// 不加延迟 fWarpElm的大小信息 （元素大小是 0 0）---> 删除 class 不是立即渲染
setTimeout(() => {
const offset = elemOffset(fWarpElm);
const location = position(el);
fWarpElm.style.cssText = `left: ${location.left - offset.width / 2}px; top: ${location.top - top - offset.height}px;`;
fWarpElm.style.opacity = 1;
}, 16);
};
//鼠标离开 元素 隐藏 气泡
const handleLeave = function (e) {
fWarpElm.style.opacity = 0;
// transitionEnd 不太好应该加入兼容
once({
el,
type: 'transitionEnd',
fn: function() {
console.log('hide');
addClass(fWarpElm, 'hide');
}
})
};
el._tip_leave_fn = handleLeave;
// 解决 slider 移动结束 提示不消失
el._tip_mouse_up_fn = function (e) {
const target = e.target;
console.log(target);
if (!contains(fWarpElm, target) && el !== target) {
handleLeave(e)
}
};
on({
el,
type: 'mouseenter',
fn: el._tip_hover_fn
});
on({
el,
type: 'mouseleave',
fn: el._tip_leave_fn
});
on({
el: doc.body,
type: 'mouseup',
fn: el._tip_mouse_up_fn
})
});
} ,
// 气泡的数据变化 依赖于 context[expression] 返回的值
componentUpdated(el , binding , vnode) {
const { context } = vnode;
const { expression } = binding;
const handleFn = expression && context[expression] || (() => '');
Vue.nextTick( () => {
const createNode = handleFn();
const fWarpElm = el._tipElm;
if (fWarpElm) {
fWarpElm.replaceChild(createNode, el._createElm);
el._createElm = createNode;
const offset = elemOffset(fWarpElm);
const location = position(el);
fWarpElm.style.cssText = `left: ${location.left - offset.width / 2}px; top: ${location.top - top - offset.height}px;`;
}
})
},
// 删除 事件
unbind (el , bind , vnode) {
off({
el: dov.body,
type: 'mouseup',
fn: el._tip_mouse_up_fn
});
el = null;
}
}slider 组件
