微信小程序 input输入框详解及简单实例

<!--input.wxml-->
<view class="section">
 <input placeholder="这是一个可以自动聚焦的input" auto-focus/>
</view>
<view class="section">
 <input placeholder="这个只有在按钮点击的时候才聚焦" focus="{{focus}}" />
 <view class="btn-area">
 <button bindtap="bindButtonTap">使得输入框获取焦点</button>
 </view>
</view>
<view class="section">
 <input maxlength="10" placeholder="最大输入长度10" />
</view>
<view class="section">
 <view class="section__title">你输入的是：{{inputValue}}</view>
 <input bindinput="bindKeyInput" placeholder="输入同步到view中"/>
</view>
<view class="section">
 <input bindinput="bindReplaceInput" placeholder="连续的两个1会变成2" />
</view>
<view class="section">
 <input bindinput="bindHideKeyboard" placeholder="输入123自动收起键盘" />
</view>
<view class="section">
 <input type="emoji" placeholder="这是一个带有表情的输入框" />
</view>
<view class="section">
 <input password type="number" />
</view>
<view class="section">
 <input password type="text" />
</view>
<view class="section">
 <input type="digit" placeholder="带小数点的数字键盘"/>
</view>
<view class="section">
 <input type="idcard" placeholder="身份证输入键盘" />
</view>
<view class="section">
 <input placeholder-style="color:red" placeholder="占位符字体是红色的" />
</view>

//input.js
Page({
 data:{
 focus:false,
 inputValue:""
 },
 bindButtonTap:function(){
 this.setData({
 focus:Date.now()
 })
 },
 bindKeyInput:function(e){
 this.setData({
 inputValue:e.detail.value
 })
 },
 bindReplaceInput:function(e){
 var value = e.detail.value;
 var pos = e.detail.cursor;
 if(pos != -1){
 //光标在中间
 var left = e.detail.value.slice(0,pos);
 //计算光标的位置
 pos = left.replace(/11/g,'2').length;
 }

 //直接返回对象，可以对输入进行过滤处理，同时可以控制光标的位置
 return {
 value:value.replace(/11/g,'2'),
 cursor:pos
 }

 //或者直接返回字符串,光标在最后边
 //return value.replace(/11/g,'2'),
 },
 bindHideKeyboard:function(e){
 if(e.detail.value === "123"){
 //收起键盘
 wx.hideKeyboard();
 }
 }
})