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：
WXML:
<view wx:if="{{popErrorMsg}}">{{popErrorMsg}}</view> <view> <form bindsubmit="goDetail" > <textarea bindinput="commentTxtFn" focus="{{isPopOpen}}" placeholder="请输入留言内容" placeholder-style="color:#cccccc;" /> <view> <text>你还可以输入</text> <text>{{commentTxtCount}}</text> <text>字</text> </view> <button 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) }, //定时器提示框3秒消失 ohShitfadeOut() { var fadeOutTimeout = setTimeout(() => { this.setData({ popErrorMsg: '' }); clearTimeout(fadeOutTimeout); }, 3000); }, })