探索flutter框架开发的app在移动应用市场的潜力与挑战
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2023-11-13
uni-app微信小程序下拉多选框实例代码
−目录1、组件代码2、使用说明总结
插件来自：select-cy - DCloud 插件市场
1、组件代码
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<template>
<view class="uni-select-cy" :style="{ z-index: zindex }">
<view class="uni-select-cy-select" :class="{ active: active }" @click.stop="handleSelect">
<!-- 禁用mask -->
<view class="uni-disabled" v-if="disabled"></view>
<!-- 清空 -->
<view class="close-icon close-postion" v-if="realValue.length && !active && !disabled && showClearIcon">
<text @click.stop="handleRemove(null)"></text>
</view>
<!-- 显示框 -->
<view class="uni-select-multiple" v-show="realValue.length">
<view class="uni-select-multiple-item" v-for="(item, index) in realValue" :key="index">
{{ item }}
<view class="close-icon" v-if="showValueClear"><text @click.stop="handleRemove(index)"></text> </view>
</view>
</view>
<!-- 为空时的显示文案 -->
<view v-if="realValue.length == 0 && showplaceholder">{{ placeholder }}</view>
<!-- 禁用图标 -->
<view class="uni-select-cy-icon" :class="{ disabled: disabled }"><text></text></view>
</view>
<!-- 下拉选项 -->
<scroll-view class="uni-select-cy-options" :scroll-y="true" v-show="active">
<template>
<view
class="uni-select-cy-item"
:class="{ active: realValue.includes(item[svalue]) }"
v-for="(item, index) in options"
:key="index"
@click.stop="handleChange(index, item)"
>
{{ item[slabel] }}
</view>
</template>
</scroll-view>
</view>
</template>
<script>
export default {
name: select-cy,
props: {
// 是否显示全部清空按钮
showClearIcon: {
type: Boolean,
default: false,
},
// 是否显示单个删除
showValueClear: {
type: Boolean,
default: true,
},
zindex: {
type: Number,
default: 999,
},
// 禁用组件
disabled: {
type: Boolean,
default: false,
},
options: {
type: Array,
default() {
return [];
},
},
value: {
type: Array,
default() {
return [];
},
},
placeholder: {
type: String,
default: 请选择,
},
showplaceholder: {
type: Boolean,
default: true,
},
slabel: {
type: String,
default: text,
},
svalue: {
type: String,
default: value,
},
},
data() {
return {
active: false, // 组件是否激活，
changevalue: [], // 搜索框同步
realValue: [],
};
},
mounted() {
// 初始化
this.init();
},
methods: {
close() {
this.active = false;
},
init() {
if (this.value.length > 0) {
this.changevalue = this.options.forEach((item) => {
this.value.forEach((i) => {
if (item[this.svalue] === i[this.svalue]) {
return item;
}
});
});
this.realValue = this.value;
} else {
this.changevalue = [];
this.realValue = [];
}
},
// 点击展示选项
handleSelect() {
if (this.disabled) return;
this.active = !this.active;
},
// 移除数据
handleRemove(index) {
if (index === null) {
this.realValue = [];
this.changevalue = [];
} else {
this.realValue.splice(index, 1);
this.changevalue.splice(index, 1);
}
this.$emit(change, this.changevalue, this.realValue);
},
// 点击组件列
handleChange(index, item) {
const arrIndex = this.realValue.indexOf(item[this.svalue]);
if (arrIndex > -1) {
this.changevalue.splice(arrIndex, 1);
this.realValue.splice(arrIndex, 1);
} else {
this.changevalue.push(item);
this.realValue.push(item[this.svalue]);
}
console.log(this.realValue, this.realValue);
this.$emit(change, this.changevalue, this.realValue);
},
},
};
</script>
<style lang="scss" scoped>
.uni-select-cy {
position: relative;
z-index: 999;
.uni-select-mask {
width: 100%;
height: 100%;
}
/* 删除按钮样式*/
.close-icon {
height: 100%;
width: 20px;
display: flex;
align-items: center;
justify-content: center;
z-index: 3;
cursor: pointer;
text {
position: relative;
background: #c0c4cc;
width: 13px;
height: 13px;
border-radius: 50%;
border: 1px solid #bbb;
&::before,
&::after {
content: ;
position: absolute;
left: 20%;
top: 50%;
height: 1px;
width: 60%;
transform: rotate(45deg);
background-color: #909399;
}
&::after {
transform: rotate(-45deg);
}
}
}
//所有情空的定位
.close-postion {
position: absolute;
right: 35px;
top: 0;
height: 100%;
width: 15px;
}
/* 多选盒子 */
.uni-select-multiple {
overflow-x: auto;
display: flex;
.uni-select-multiple-item {
background: #f4f4f5;
margin-right: 5px;
padding: 2px 4px;
border-radius: 4px;
color: #909399;
display: flex;
}
}
// select部分
.uni-select-cy-select {
user-select: none;
position: relative;
z-index: 3;
height: 36px;
padding: 0 30px 0 10px;
box-sizing: border-box;
border-radius: 4px;
border: 1px solid rgb(229, 229, 229);
display: flex;
align-items: center;
font-size: 14px;
color: #999;
.uni-disabled {
position: absolute;
left: 0;
width: 100%;
height: 100%;
z-index: 19;
cursor: no-drop;
background: rgba(255, 255, 255, 0.5);
}
.uni-select-cy-input {
font-size: 14px;
color: #999;
display: block;
width: 96%;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
line-height: 30px;
box-sizing: border-box;
&.active {
color: #333;
}
}
.uni-select-cy-icon {
cursor: pointer;
position: absolute;
right: 0;
top: 0;
height: 100%;
width: 30px;
display: flex;
align-items: center;
justify-content: center;
&::before {
content: ;
width: 1px;
height: 100%;
position: absolute;
left: 0;
top: 0;
background-color: #e5e5e5;
}
text {
display: block;
width: 0;
height: 0;
border-width: 12rpx 12rpx 0;
border-style: solid;
border-color: #bbb transparent transparent;
transition: 0.3s;
}
&.disabled {
cursor: no-drop;
text {
width: 20rpx;
height: 20rpx;
border: 2px solid #ff0000;
border-radius: 50%;
transition: 0.3s;
position: relative;
z-index: 999;
&::after {
content: ;
position: absolute;
top: 50%;
left: 0;
width: 100%;
height: 2px;
margin-top: -1px;
background-color: #ff0000;
transform: rotate(45deg);
}
}
}
}
&.active .uni-select-cy-icon {
text {
transform: rotate(180deg);
}
}
}
// options部分
.uni-select-cy-options {
user-select: none;
position: absolute;
top: calc(100% + 5px);
left: 0;
width: 100%;
height: 500rpx;
border-radius: 4px;
border: 1px solid rgb(229, 229, 229);
background: #fff;
padding: 5px 0;
box-sizing: border-box;
z-index: 9;
.uni-select-cy-item {
padding: 0 10px;
box-sizing: border-box;
cursor: pointer;
line-height: 2.5;
transition: 0.3s;
font-size: 14px;
&.active {
color: #409eff;
background-color: #f5f7fa &hover {
color: #409eff;
background-color: #f5f7fa;
}
}
&:hover {
background-color: #f5f5f5;
}
}
}
}
</style>
2、使用说明
总结
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