189 8069 5689
大致结构DOM结构 一个div 包含 箭头 及 气泡内容。
v-bind中可选tooltip位置，是否禁用，及显示隐藏
slot 差值供自定义 默认接收content内容
script
import EventListener from '../utils/EventListener.js';
export default {
props: {
// 需要监听的事件
trigger: {
type: String,
default: 'click'
},
effect: {
type: String,
default: 'fadein'
},
title: {
type: String
},
// toolTip消息提示
content: {
type: String
},
header: {
type: Boolean,
default: true
},
placement: {
type: String
}
},
data() {
return {
// 通过计算所得 气泡位置
position: {
top: 0,
left: 0
},
show: true
};
},
watch: {
show: function(val) {
if (val) {
const popover = this.$refs.popover;
const triger = this.$refs.trigger.children[0];
// 通过placement计算出位子
switch (this.placement) {
case 'top' :
this.position.left = triger.offsetLeft - popover.offsetWidth / 2 + triger.offsetWidth / 2;
this.position.top = triger.offsetTop - popover.offsetHeight;
break;
case 'left':
this.position.left = triger.offsetLeft - popover.offsetWidth;
this.position.top = triger.offsetTop + triger.offsetHeight / 2 - popover.offsetHeight / 2;
break;
case 'right':
this.position.left = triger.offsetLeft + triger.offsetWidth;
this.position.top = triger.offsetTop + triger.offsetHeight / 2 - popover.offsetHeight / 2;
break;
case 'bottom':
this.position.left = triger.offsetLeft - popover.offsetWidth / 2 + triger.offsetWidth / 2;
this.position.top = triger.offsetTop + triger.offsetHeight;
break;
default:
console.log('Wrong placement prop');
}
popover.style.top = this.position.top + 'px';
popover.style.left = this.position.left + 'px';
}
}
},
methods: {
toggle() {
this.show = !this.show;
}
},
mounted() {
if (!this.$refs.popover) return console.error("Couldn't find popover ref in your component that uses popoverMixin.");
// 获取监听对象
const triger = this.$refs.trigger.children[0];
// 根据trigger监听特定事件
if (this.trigger === 'hover') {
this._mouseenterEvent = EventListener.listen(triger, 'mouseenter', () => {
this.show = true;
});
this._mouseleaveEvent = EventListener.listen(triger, 'mouseleave', () => {
this.show = false;
});
} else if (this.trigger === 'focus') {
this._focusEvent = EventListener.listen(triger, 'focus', () => {
this.show = true;
});
this._blurEvent = EventListener.listen(triger, 'blur', () => {
this.show = false;
});
} else {
this._clickEvent = EventListener.listen(triger, 'click', this.toggle);
}
this.show = !this.show;
},
// 在组件销毁前移除监听，释放内存
beforeDestroy() {
if (this._blurEvent) {
this._blurEvent.remove();
this._focusEvent.remove();
}
if (this._mouseenterEvent) {
this._mouseenterEvent.remove();
this._mouseleaveEvent.remove();
}
if (this._clickEvent) this._clickEvent.remove();
}
};// EventListener.js
const EventListener = {
/**
* Listen to DOM events during the bubble phase.
*
* @param {DOMEventTarget} target DOM element to register listener on.
* @param {string} eventType Event type, e.g. 'click' or 'mouseover'.
* @param {function} callback Callback function.
* @return {object} Object with a `remove` method.
*/
listen(target, eventType, callback) {
if (target.addEventListener) {
target.addEventListener(eventType, callback, false);
return {
remove() {
target.removeEventListener(eventType, callback, false);
}
};
} else if (target.attachEvent) {
target.attachEvent('on' + eventType, callback);
return {
remove() {
target.detachEvent('on' + eventType, callback);
}
};
}
}
};
export default EventListener;封装的事件监听
使用
使用content属性来决定hover时的提示信息。由placement属性决定展示效果：placement属性值为：方向-对齐位置；四个方向：top、left、right、bottom。trigger属性用于设置触发tooltip的方式，默认为hover。