前言
本文主要Alert 组件的大致框架, 提供少量可配置选项。 旨在大致提供思路
tooltip
常用于展示鼠标 hover 时的提示信息。
模板结构
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
script
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();
}
};
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();
}
};
SEOver'.
* @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,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。
content内容分发
设置一个名为content的slot。
内容分发的conent。
Attributes
说明 | 类型 | 可选值 | 默认值 |
---|---|---|---|