Detailed explanation of MaterialDesign--input component of WeChat applet

This article mainly introduces the detailed explanation of the MaterialDesign--input component of the WeChat applet. It has certain reference value. Interested friends can refer to it.

This effect is mainly achieved through input events and css transform dynamic changes.

During the actual debugging process, the detail object called back after the bindinput event of the input component is triggered contains the cursor attribute in the simulator, but does not have this attribute in the real device (tested on Android, not on ios). Finally Select the length of the value attribute in the detail object to synchronize the number of input digits.

It is best not to add code that changes css to the bindfocus event.

Preview image:

JS:

//index.js
//获取应用实例
var app = getApp()
Page({
 data: {
  v_username_border:'', //用户输入框底部border样式
  v_pwd_border:'', // 密码输入框底部border样式
  v_float_username:'', // 浮动文字字transform 样式
  v_float_pwd:'',
  num_current_un:0, // 当前输入的文本位数
  sp_num_current_un:'', // 当前输入文本位数超过限制时的样式
  isPwdError:false // 提交时 密码输入错误时的文本提示
 },
 onLoad: function () {
  console.log('onLoad')
 },
 // 用户名输入框获取焦点时事件回调
 usernameFocus:function(e){
  var that = this;
  console.log(e.detail)
 },
 // 用户名输入框输入时事件回调
 usernameInput:function(e){
  console.log(e.detail)
   this.setData({
   v_username_border:'border-bottom:1px solid red',
   num_current_un:e.detail.value.length
  })
  if(e.detail.value.length!=0){
    this.setData({
    v_float_username:'color:red ;transform: translateY(-18.5px)',
    sp_num_current_un:'color:lightseagreen;'
   })
   if(e.detail.value.length>20){
    this.setData({
     sp_num_current_un:'color:orangered;'
    })
   }
  }else{
   this.setData({
    v_float_username:'transform: translateY(0px)',
   })
  }
 },
 // // 用户名输入框失去焦点时回调
 usernameBlur:function(e){
  console.log("onBlur")
   this.setData({
   v_username_border:'border-bottom:1px solid grey'
  })
 },
 pwdFocus:function(e){
  console.log('onFocus')
 },
 pwdInput:function(e){
  this.setData({
   v_pwd_border:'border-bottom:1px solid red',
   isPwdError:false
  })
  console.log(e.detail)
  if(e.detail.value.length!=0){
   this.setData({
    v_float_pwd:'color:red ; transform: translateY(-18.5px)',
   })
  }else{
   this.setData({
    v_float_pwd:'transform: translateY(0px)',
   })
  }
 },
  pwdBlur:function(e){
  console.log("onBlur")
   this.setData({
   v_pwd_border:'border-bottom:1px solid grey; '
  })
 },
// 登录按钮模拟表单提交 可用form组件代替
 onLogin:function(e){
  this.setData({
   isPwdError:true
  })
 }
})

That’s it I hope that the entire content of this article will be helpful to everyone's learning, and I also hope that everyone will support the PHP Chinese website.

For more detailed explanations of the MaterialDesign--input component of the WeChat applet, please pay attention to the PHP Chinese website!