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How to pass parameters on the page in the mini program
Home WeChat Applet Mini Program Development Let's talk about several page parameter transfer methods in mini programs.

Let's talk about several page parameter transfer methods in mini programs.

Oct 25, 2021 am 10:52 AM
Applets Page parameter passing

This article will introduce you to several page parameter passing methods in the mini program. I hope it will be helpful to you!

Let's talk about several page parameter transfer methods in mini programs.

How to pass parameters on the page in the mini program

Passing parameters through url

The method is consistent with the method in the web.

index1 Page

<navigator url="/pages/index2/index2?name=海賊王">頁面2</navigator>

or 

    wx.navigateTo({
      url: "/pages/index2/index2?name=海賊王"
    })

index2 Page

  onLoad: function (options) {
    console.log(options);// { name : 海賊王}
  },

Need to pay attention to Yes, if index2 is a tabbar page, the page parameters cannot be obtained in onLoad. [Related learning recommendations: 小program development tutorial]

Event channel EventChannel

If a page is Another page is opened through wx.navigateTo, and a data channel will be established between the two pages:

  • The opened page can be opened through this.getOpenerEventChannel() method to obtain an EventChannel object;
  • wx.navigateTo’s success callback also contains a EventChannel Object.

These two EventChannel objects can use the emit and on methods to send and listen to events.

index1.wxml

<view>
  來自于頁面2 傳遞的數(shù)據(jù): {{msg}}
</view>

index1.js

Page({
  data: {
    msg: ""
  },
  onLoad: function () {
    // 1 跳轉(zhuǎn)到頁面2
    wx.navigateTo({
      url: "/pages/index2/index2",
      // 2 在成功的回調(diào)函數(shù)中獲取事件通道對象
      success: ({ eventChannel }) => {
        // 3 監(jiān)聽自定義事件
        eventChannel.on("data", (e) => {
          // 4 獲取頁面2傳遞過來的數(shù)據(jù) 設(shè)置到 data中
          this.setData({
            msg: e.name
          })
        })
      }
    });
  },
})

index2.js

Page({
  onLoad: function () {
    // 被使用 wx.navigatorTo打開的頁面獲取獲取到一個(gè)事件通道對象
    const EventChannel = this.getOpenerEventChannel();
    // 觸發(fā)事件和傳遞參數(shù)到 頁面1中
    EventChannel.emit("data", { name: &#39;海賊王&#39; });
  }
})

Local storage

The local storage usage in the applet is similar to that in the web, and it can obtain and store data throughout the application

index1.js

wx.setStorageSync(&#39;data&#39;, {name:&#39;海賊王&#39;});// 可以直接存任意類型的數(shù)據(jù)

index2.js

wx.getStorageSync(&#39;data&#39;);// 獲取

Apply global variables

Different pages are in a common application. This application can be understood as app.js

app.js

Public data can be defined here

App({
  myData: {
    name: "悟空"
  }
})

index1.js

The page can be obtained through getApp

    let app = getApp();
    console.log(app.myData);

Of course, you can also modify it directly

    let app = getApp();
    app.myData.name="八戒";

Public variables

define an independent js file separately and store the data in it

common.js

const data = {
  name: "海賊王"
};

module.exports = data;

index1.js

const data = require("../../common");
Page({
  onLoad: function () {
    console.log(data);
  },
})

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