Form verification example tutorial for mini program development

This article mainly introduces the WeChat applet in detailForm verificationThe error prompt effect. Click to confirm to publish the error prompt that cannot be empty. It has certain reference value. Interested friends can refer to it. Verify the form of the

WeChat applet, click Confirm to publish the error message that cannot be empty, the specific content is as follows

The following is the rendering:

The code is as follows:

WXML:

<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?&#39;danger&#39;:&#39;&#39;}}">{{commentTxtCount}}</text> 
 <text class="one_star">字</text> 
 </view> 
 <button class="informBtn" form-type="submit">确认发布</button> 
</form> 
</view>

WXSS:

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;}

JS:

// 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); 
 }, 
 
})

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