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表单验证 点击确认发布不能为空错误提示 
以下是效果图：

代码如下：

[html] view plain copy print?在CODE上查看代码片派生到我的代码片

<view class="ad_popError" wx:if="{{popErrorMsg}}">{{popErrorMsg}}</view>

<view class="ad_popFt">

<form bindsubmit="goDetail" >

<textarea class="ad_popArea" bindinput="commentTxtFn" focus="{{isPopOpen}}" placeholder="请输入留言内容" placeholder-style="color:#cccccc;" name="textarea" />

<view class="ad_popCout">

<text class="one_star">你还可以输入</text>

<text class="one_stars {{!!tips?'danger':''}}">{{commentTxtCount}}</text>

<text class="one_star">字</text>

</view>

<button class="informBtn" form-type="submit">确认发布</button>

</form>

</view>

[css] view plain copy print?在CODE上查看代码片派生到我的代码片

page{background: #f4f4f4;}

.ad_popHd{height: 76rpx; line-height: 76rpx; font-size: 32rpx;text-align: center; border-bottom: 1px solid #cdd1cd; padding: 0 20rpx;color: #202120;}

.ad_popFt{ margin: 20rpx ; margin-top: 50rpx;}

.ad_popArea{ width: 708rpx; height:400rpx;font-size:30rpx;padding: 20rpx; box-sizing: border-box; -webkit-box-sizing: border-box; line-height: 40rpx; color: #333; background: #fff; }

.ad_popCout{ color: #969899; font-size: 24rpx; text-align: right; line-height: 58rpx; padding: 0 20rpx;}

.informBtn{background: #09bb07;color: #fff;font-size: 34rpx; margin-top: 38rpx;height: 88rpx;}

.one_stars{color: #999;}

.one_star{font-size: 20rpx;color: #999;}

.danger{ color: #f64400;}

.ad_popError{ background: #de352d; color: #fff; height: 58rpx; line-height: 58rpx; font-size: 24rpx; text-align: center; position: absolute; left: 0; top: 0; width: 100%; z-index:3;}

[javascript] view plain copy print?在CODE上查看代码片派生到我的代码片

// pages/informLeaveMsg/informLeaveMsg.js

Page({

/**

* 页面的初始数据

*/

data: {

},

//确认发布

goDetail:function(e){

setTimeout(()=>{

var subValue = e.detail.value.textarea

console.log(subValue)

if (subValue == null || subValue == "") {

console.log("不能为空")

this.setData(

{ popErrorMsg: "发布的留言内容不能为空" }

);

this.ohShitfadeOut();

return;

}

},100)

},

ohShitfadeOut() {

var fadeOutTimeout = setTimeout(() => {

this.setData({ popErrorMsg: '' });

clearTimeout(fadeOutTimeout);

}, 3000);

},