页面滚动时隐藏element-ui下拉框/时间弹框
场景
在系统中，当（有垂直滚动时）点击下拉框后滚动页面，会发现下拉项会遮盖住页面中的元素，不会隐藏
解决：(以vue为例)
在页面滚动或者缩放时隐藏下拉项即可（借助点击目标元素，下拉项会自动隐藏的特点）
案例代码：
<template>
<div class="wrapper">
<el-form :model="ruleForm" :rules="rules" ref="ruleForm" label-width="100px" class="demo-ruleForm">
<el-form-item label="活动名称" prop="name">
<el-input v-model="ruleForm.name"></el-input>
</el-form-item>
<el-form-item label="活动区域" prop="region">
<el-select v-model="ruleForm.region" placeholder="请选择活动区域">
<el-option label="区域一" value="shanghai"></el-option>
<el-option label="区域二" value="beijing"></el-option>
</el-select>
</el-form-item>
<el-form-item label="即时配送" prop="delivery">
<el-switch v-model="ruleForm.delivery"></el-switch>
</el-form-item>
<el-select v-model="value" placeholder="请选择">
<el-option
v-for="item in options"
:key="item.value"
:label="item.label"
:value="item.value">
</el-option>
</el-select>
<el-form-item label="活动性质" prop="type">
<el-checkbox-group v-model="ruleForm.type">
<el-checkbox label="美食/餐厅线上活动" name="type"></el-checkbox>
<el-checkbox label="地推活动" name="type"></el-checkbox>
<el-checkbox label="线下主题活动" name="type"></el-checkbox>
<el-checkbox label="单纯品牌曝光" name="type"></el-checkbox>
</el-checkbox-group>
</el-form-item>
<el-select v-model="value2" placeholder="请选择">
<el-option
v-for="item in options"
:key="item.value"
:label="item.label"
:value="item.value">
</el-option>
</el-select>
<el-form-item label="特殊资源" prop="resource">
<el-radio-group v-model="ruleForm.resource">
<el-radio label="线上品牌商赞助"></el-radio>
<el-radio label="线下场地免费"></el-radio>
</el-radio-group>
</el-form-item>
<el-select v-model="value3" placeholder="请选择">
<el-option
v-for="item in options"
:key="item.value"
:label="item.label"
:value="item.value">
</el-option>
</el-select>
<el-form-item label="活动形式" prop="desc">
<el-input type="textarea" v-model="ruleForm.desc"></el-input>
</el-form-item>
<el-select v-model="value4" placeholder="请选择">
<el-option
v-for="item in options"
:key="item.value"
:label="item.label"
:value="item.value">
</el-option>
</el-select>
<el-form-item>
<el-button type="primary" @click="submitForm('ruleForm')">立即创建</el-button>
<el-button @click="resetForm('ruleForm')">重置</el-button>
</el-form-item>
</el-form>
</div>
</template>
<script>
export default {
data() {
return {
ruleForm: {
name: '',
region: '',
date1: '',
date2: '',
delivery: false,
type: [],
resource: '',
desc: ''
},
options: [{
value: '选项1',
label: '黄金糕'
}, {
value: '选项2',
label: '双皮奶'
}, {
value: '选项3',
label: '蚵仔煎'
}, {
value: '选项4',
label: '龙须面'
}, {
value: '选项5',
label: '北京烤鸭'
}],
value: '',
value1: '',
value2: '',
value3: '',
value4: '',
rules: {
},
mouseUp: null,
mouseDown: null
};
},
mounted() {
this.$nextTick(() => {
let scrollDom = document.querySelectorAll('.wrapper')[0];
// 滚动监听的容器是scrollDom或者window下，在哪个下监听哪个
window.addEventListener('scroll', () => {
this.scrollHide('.el-select-dropdown');
}, false);
})
},
methods: {
// 隐藏popper
hidePopper(cls = '.el-popper') {
const dom = document.querySelector(cls);
console.log(cls, dom, 9999999);
if( !dom ){ return; }
// 创建鼠标事件
if (!this.mouseUp || !this.mouseDown) {
console.log('-----create events-----');
this.mouseUp = new MouseEvent('mouseup', { 'view': window, 'bubbles': true, 'cancelable': true });
this.mouseDown = new MouseEvent('mousedown', { 'view': window, 'bubbles': true, 'cancelable': true });
}
// 顺序触发mouseDown、mouseUp
dom.dispatchEvent(this.mouseDown);
dom.dispatchEvent(this.mouseUp);
},
// 清除鼠标事件
delEvents() {
console.log('-----delete events-----');
this.mouseUp = null;
this.mouseDown = null;
},
/**
* 滚动时隐藏
* @param cls 隐藏的元素class:如下拉、时间弹框等
*/
scrollHide(cls) {
if( this.mouseUp || this.mouseDown ) { this.delEvents(); } // 先移除
this.hidePopper(cls);
},
submitForm(formName) {
},
resetForm(formName) {
this.$refs[formName].resetFields();
}
}
}
</script>
<style lang="less">
.wrapper {
width: 100%;
height: 2000px;
}
</style>主要逻辑代码：
1、监听当前滚动元素的scroll事件
// window或当前滚动元素的dom节点
// 滚动监听的容器 滚动容器是哪个就监听哪个
// let scrollDom = document.querySelectorAll('.wrapper')[0];
// scrollDom下滚动或者window下滚动
window.addEventListener('scroll', () => {
this.scrollHide('.el-select-dropdown');
}, false);2、定义滚动监听的容器
/**
* 滚动时隐藏
* @param cls 隐藏的元素class:如下拉、时间弹框等
*/
scrollHide(cls) {
if( this.mouseUp || this.mouseDown ) { this.delEvents(); } // 先移除
this.hidePopper(cls);
},3、隐藏popper
hidePopper(cls = '.el-popper') {
const dom = document.querySelector(cls);
console.log(cls, dom, 9999999);
if( !dom ){ return; }
// 创建鼠标事件
if (!this.mouseUp || !this.mouseDown) {
console.log('-----create events-----');
this.mouseUp = new MouseEvent('mouseup', { 'view': window, 'bubbles': true, 'cancelable': true });
this.mouseDown = new MouseEvent('mousedown', { 'view': window, 'bubbles': true, 'cancelable': true });
}
// 顺序触发mouseDown、mouseUp
dom.dispatchEvent(this.mouseDown);
dom.dispatchEvent(this.mouseUp);
},4、清除鼠标事件
delEvents() {
console.log('-----delete events-----');
this.mouseUp = null;
this.mouseDown = null;
},使用：
1、隐藏下拉项
// 如果是el-table中的select，则监听的dom为.el-table__body-wrapper
// 如果是在自定义的元素里，则监听的dom为自定义滚动的元素 如 .wrapper
window.addEventListener('scroll', () => {
this.scrollHide('.el-select-dropdown');
}, false);
2、隐藏时间弹框
// 如果是el-table中的select，则监听的dom为.el-table__body-wrapper
// 如果是在自定义的元素里，则监听的dom为自定义滚动的元素 如 .wrapper
window.addEventListener('scroll', () => {
this.scrollHide('.el-date-range-picker');
}, false);