本文实例讲述了微信小程序实现动态设置placeholder提示文字及按钮选中取消状态的方法。分享给大家供大家参考,具体如下:
效果图展示
通过绑定点击事件placeholder方法,获取data-num的值,通过js判断num等于几,然后通过class={{num==X?'active':''}}
表达式判断哪个标签处于选中状态(即蓝底白字);
js通过获取data-key,设置input输入框中placeholder的动态值
wxml里的内容:
<view class=retrieve-list> <p class=option> <span bindtap=placeholder data-num='1' data-key='' data-val='' class={{num==1?'active':''}}>全部</span> <span bindtap=placeholder data-num='2' data-key='标题' data-val='ti' class={{num==2?'active':''}}>标题</span> <span bindtap=placeholder data-num='3' data-key='摘要' data-val='ab' class={{num==3?'active':''}}>摘要</span> <span bindtap=placeholder data-num='4' data-key='申请人' data-val='ap' class={{num==4?'active':''}}>申请人</span> <span bindtap=placeholder data-num='5' data-key='申请号' data-val='an' class={{num==5?'active':''}}>申请号</span> <span bindtap=placeholder data-num='6' data-key='代理人' data-val='ag' class={{num==6?'active':''}}>代理人</span> </p> <p class=option> <span bindtap=placeholder data-num='7' data-key='代理机构' data-val='ac' class={{num==7?'active':''}}>代理机构</span> <span bindtap=placeholder data-num='8' data-key='公开号' data-val='pn' class={{num==8?'active':''}}>公开号</span> <span bindtap=placeholder data-num='9' data-key='发明人' data-val='in' class={{num==9?'active':''}}>发明人</span> <span bindtap=placeholder data-num='10' data-key='专利权人' data-val='pa' class={{num==10?'active':''}}>专利权人</span> </p> </view>
js里的内容:
var app = getApp() Page({ data: { placeholder:'请输入', ph:'', num:1, key:'', }, placeholder:function(e){ var num = e.currentTarget.dataset.num this.setData({ ph: this.data.placeholder+e.currentTarget.dataset.key }) this.setData({ num: num }) })