微信小程序 textarea 层级过高的解决方式

Posted 2022-04-04 microestc

建立一个新的textarea 组件代替原生textarea ,废话不多说,上代码

<template>
    <view class="ui-textarea">
        <textarea class="textarea  hide? ‘hidden‘:‘‘" auto-height maxlength="maxlength" name=" name " value=" txt " placeholder=" placeholder " bindinput="onInput" bindblur="onBlur" focus="focus"></textarea>
        <view hidden=" hide == false " class=" txt === ‘‘?‘text placeholder‘:‘text‘" bindtap="onFocus"> txt ===‘‘? placeholder:txt </view>
    </view>
</template>
<script>
export default 
    config: 
        usingComponents: 
    ,
    behaviors: [],
    properties: 
        placeholder: 
            type: String,
            value: ‘‘
        ,
        maxlength: 
            type: Number,
            value: 128
        ,
        name: String,
        value: 
            type: String,
            value: ‘‘
        
    ,
    data: 
        hide: true,
        txt: ‘‘,
        focus: false
    ,
    ready() 
        if (this.data.value != ‘‘) 
            this.setData( txt: this.data.value )
        
    ,
    methods: 
        onFocus() 
            this.setData( hide: false, focus: true )
        ,
        onInput(e) 
            this.setData( txt: e.detail.value )
        ,
        onBlur() 
            this.setData( hide: true, focus: false )
        
    

</script>
<style lang="less">
.ui-textarea 
  position: relative !important;

  .textarea.hidden 
    display: block !important;
    position: absolute !important;
    left: -999px;
    right: -999px;
    top: 0;
  

  .textarea 
    width: 100%;
    box-sizing: border-box;
  

  .text 
    height: 100%;
    padding: 6px 5px;
    font-size: 14px;
  

  .placeholder 
    color: #888;
  

</style>

Vue 代码,自己根据需求改一下 ,特别注意,不要用 wx;if 或者 hidden 属性 , wx:if 频繁渲染,虽然可以用,hidden 会出现 部分显示bug,[hidden]  会使auto-height 首次不正确