Detailed explanation of WeChat applet local storage and login page processing examples

Example content

Login interface
Process login form data
Process login form data (asynchronous)
Clear local data
Login interface:
Add the login page

app.json

in

pages/login/login

and set it as the entrance.

After saving, the relevant files will be automatically generated (very convenient).

Modify view file

login.wxml

<!--pages/login/login.wxml-->
<view class="container">
  <form bindsubmit="formSubmit">
    <view class="row">
      <text>姓 名：</text>
      <input type="text" name="userName" placeholder="请输入用户名" />
    </view>
    <view class="row">
      <text>密 码：</text>
      <input type="password" name="userPassword" placeholder="请输入密码" />
    </view>
    <view class="row">
      <button type="primary" form-type="submit">登陆</button>
    </view>

  </form>
</view>

Modify login style

login.wxss

/* pages/login/login.wxss */
.container{
  padding: 1rem;
  font-size: 0.9rem;
  line-height: 1.5rem;
  border-shadow: 1px 1px #0099CC;
}
.row{
  display: flex;
  align-items: center;
  margin-bottom: 0.8rem;
}
.row text{
  flex-grow: 1;
  text-align: right;
}
.row input{
  font-size: 0.7rem;
  color: #ccc;
  flex-grow: 3;
  border: 1px solid #0099CC;
  display: inline-block;
  border-radius: 0.3rem;
  box-shadow: 0 0 0.15rem #aaa;
  padding: 0.3rem;
}
.row button{
  padding: 0 2rem;
}

Look at the style:

Form related properties:

#Attribute nameTypeDescription##report-submitbindsubmitbindresetbindsubmit is used here to process the submitted form data.

Boolean	Whether to return formId Used to send template messages
EventHandle	Carries the data in the form to trigger the submit event, event.detail = { value : {"name ":"value"} , formId:"" }
EventHandle	The reset event will be triggered when the form is reset

Input related attributes

##Attribute nameTypeDefault valueDescriptionvalueStringtypeStringtextType of input, valid values: text,number,idcard,digit,time,dateBooleanStringPlaceholder when the input box is emptyStringplaceholder-classStringinput-placeholderSpecify the style class of placeholderdisabledBooleanfalseWhether it is disabledmaxlengthNumber140Maximum input length, when set to 0, there is no limit to the maximum lengthauto-focusBooleanfalseAuto focus, pull up the keyboard. There can only be one input in the page that sets the auto-focus attributefocusBooleanfalseso that the input gets focusbindchangeEventHandle##When the input box loses focus, the bindchange event is triggered, event.detail={value :value} Input boxes other than date/time type, when used as keyboard When inputting, the input event is triggered, event.detail={value:value}, and the processing function can directly return a string, which will replace the content of the input box. Triggered when the input box is focused, event.detail = {value:value} Triggered when the input box loses focus, event.detail = {value:value }

		Contents of the input box
			##password
false	Whether it is a password type		placeholder
			placeholder-style
	##Specify the style of placeholder
		bindinput	EventHandle
		bindfocus	EventHandle
		bindblur	EventHandle
			button related properties

Default valueDescriptionsizeStringdefaultValid valuesdefault, minitypeStringdefaultThe style type of the button, valid values ​​primary, default, warnplainBooleanfalseWhether the button is hollow and the background color is transparentdisabledBooleanfalseWhether to disableloadingBooleanfalse Whether there is a loading icon before the nameformTypeStringNoneValid values: submit, reset, used for form components , clicking will trigger the submit/reset event respectivelyhover-classStringbutton-hoverThe specified button is pressed. style class. When hover-class="none", there is no click effect

此Demo中将button的formType设置为submit用于激活表单提交事件。
实例二: 处理登陆表单数据
修改login.js

// pages/login/login.js
Page({
 data:{
  userName:'',
  userPassword:'',
 },

 formSubmit:function(e){
  console.log(e.detail.value);//格式 Object {userName: "user", userPassword: "password"}

  //获得表单数据
  var objData = e.detail.value;

  if(objData.userName && objData.userPassword){
   // 同步方式存储表单数据
   wx.setStorageSync('userName', objData.userName);
   wx.setStorageSync('userPassword', objData.userPassword);

   //跳转到成功页面
   wx.navigateTo({
    url: '../index/index'
   })
  }
 },

 //加载完后，处理事件 
 // 如果有本地数据，则直接显示
 onLoad:function(options){
  //获取本地数据
  var userName = wx.getStorageSync('userName');
  var userPassword = wx.getStorageSync('userPassword');

  console.log(userName);
  console.log(userPassword);
  if(userName){
   this.setData({userName: userName});
  }
  if(userPassword){
   this.setData({userPassword: userPassword});
  }

 },
 onReady:function(){
  // 页面渲染完成
 },
 onShow:function(){
  // 页面显示
 },
 onHide:function(){
  // 页面隐藏
 },
 onUnload:function(){
  // 页面关闭
 }
})

这里使用到了wx.getStorageSync和wx.setStorageSync，这里说一下，上面这两个方法类似于HTML5的本地存储，属于同步存储方式。
这两个方法，使用很简单，列下参数：
wx.setStorageSync(KEY,DATA)

		#Attribute name	Type

属性名	类型	必填	说明
key	String	是	本地缓存中的指定的key
data	Object/String	是	需要存储的内容

wx.getStorageSync

属性名	类型	必填	说明
KEY	String	是	本地缓存中的指定的key

修改一下login.wxml

<view class="row">
      <text>姓 名：</text>
      <input type="text" name="userName" placeholder="请输入用户名" value="{{userName}}" />
    </view>
    <view class="row">
      <text>密 码：</text>
      <input type="password" name="userPassword" placeholder="请输入密码" value="{{userPassword}}" />
    </view>

这个小实例，会在登陆的时候，将登陆信息存到本地存储，当下次登陆时，如果本地存储中有相应信息，则直接填写上。
效果（再一次运行后，自动填写上了信息）：


实例三: 处理登陆表单数据（异步）
这里采用异步的方式存放数据。
修改一下

login.js

// pages/login/login.js
Page({
 data:{
  userName:'',
  userPassword:'',
 },

 formSubmit:function(e){
  console.log(e.detail.value);//格式 Object {userName: "user", userPassword: "password"}

  //获得表单数据
  var objData = e.detail.value;

  if(objData.userName && objData.userPassword){
   // 同步方式存储表单数据
   wx.setStorage({
    key:'userName', 
    data:objData.userName
   });
   wx.setStorage({
    key:'userPassword', 
    data:objData.userPassword
   });

   //跳转到成功页面
   wx.navigateTo({
    url: '../index/index'
   })
  }
 },

 //加载完后，处理事件 
 // 如果有本地数据，则直接显示
 onLoad:function(options){
  var that = this;
  //获取本地数据
  wx.getStorage({
   key: 'userName',
   success: function(res){
    console.log(res.data);
    that.setData({userName: res.data});
   }
  });
  wx.getStorage({
   key: 'userPassword',
   success: function(res){
    console.log(res.data);
    that.setData({userPassword: res.data});
   }
  });
 },
 onReady:function(){
  // 页面渲染完成
 },
 onShow:function(){
  // 页面显示
 },
 onHide:function(){
  // 页面隐藏
 },
 onUnload:function(){
  // 页面关闭
 }
})

wx.setStorage(OBJECT)

属性名类型必填说明keyString是本地缓存中的指定的 keydataObject/String是需要存储的内容successFunction否接口调用成功的回调函数failFunction否接口调用失败的回调函数completeFunction否接口调用结束的回调函数（调用成功、失败都会执行）wx.getStorage(OBJECT)

属性名	类型	必填	说明
key	String	是	本地缓存中的指定的 key
success	Function	是	接口调用的回调函数,res = {data: key对应的内容}
fail	Function	否	接口调用失败的回调函数
complete	Function	否	接口调用结束的回调函数（调用成功、失败都会执行）

实例四: 清除本地数据
这里就不详细写了，直接介绍一下这两个清除本地数据的方法。

wx.clearStorage()

wx.clearStorageSync()

直接执行即可实现。
感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！

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