Detailed explanation of WeChat applet page jump and data transfer examples

WeChat applet page jump and data transfer

1. Pilot

In Android, our Activity and Fragment have stacks The concept of stack is in it, and the WeChat applet page also has the concept of stack in it. There are four ways to jump to the WeChat applet page:

1.wx.navigateTo(OBJECT);
2.wx.redirectTo(OBJECT);
3.wx.switchTab( OBJECT);
4.wx.navigateBack(OBJECT)
5. Use to implement the corresponding jump function;

Analysis:

1. where navigateTo is Save the original page in the page stack. When jumping to the next page, the target page is also pushed into the stack. Only in this case can you click the return button on the phone to jump to the previous page;

2. RedirectTo and switchTab both clear the original page in the stack first, and then push the target page into the stack. Using these two jump methods, you cannot return to the previous page through the system's return key, but exit directly. Mini program;

3. When using redirectTo, it must be used with the tabBar or the jump button in the page, otherwise you cannot return to the previous page;

4. The page that switchTab jumps to must be the page declared in tabBar;

5. The fields defined in tabBar cannot exceed 5 pages, and the page stack level of the applet cannot exceed 5 layers. .

6. navigateBack can only return to the specified page in the page stack, and is generally used in conjunction with navigateTo.

7. wx.navigateTo and wx.redirectTo are not allowed to jump to the tabbar page, only wx.switchTab can be used to jump to the tabbar page
   

2. Specific operations for page jump

(1)wx.navigateTo(OBJECT)

Keep the current page and jump Go to a page in the application and use wx.navigateBack to return to the original page.

##urlString is the path of the non-tabBar page in the application that needs to be jumped to, the path Parameters can be taken later. Parameters and paths are separated by ?, parameter keys and parameter values ​​are connected by =, and different parameters are separated by &; for example, 'path?key=value&key2=value2'successFunctionNoCallback function for successful interface callfailFunctionNo Callback function for interface call failurecompleteFunctionNoCallback function for end of interface call Function (executed successfully or failed)

Parameters	Type	Required	Description

Sample code:

wx.navigateTo({
 url: 'test?id=1'//实际路径要写全
})

##

//test.js
Page({
 onLoad: function(option){
 console.log(option.query) 
 }
})

Note: In order not to cause trouble to users when using the mini program, we stipulate that the page path can only be five levels. Please try to avoid multi-level interactions.

(2) wx.redirectTo(OBJECT)

Close the current page and jump to a page within the application.

Parametersurlsuccessfailcomplete##Sample code:

Type	Required	Description
#String	is the non-tabBar page in the app that	needs to jump to Path. Parameters can be taken after the path. Parameters and paths are separated by ?, parameter keys and parameter values ​​are connected by =, and different parameters are separated by &; for example, 'path?key=value&key2=value2'
Function	No	Callback function for successful interface call
Function	No	Callback function for interface call failure
Function	No	Callback function for end of interface call Function (executed successfully or failed)

wx.redirectTo({
 url: 'test?id=1'
})

( 3) wx.switchTab(OBJECT)

Jump to the tabBar page and close all other non-tabBar pages

OBJECT parameter description:

ParametersTypeRequiredDescription##urlStringFunctionFunction Function

is the path of the tabBar page that

needs to jump to (the page needs to be defined in the tabBar field of app.json), after the path Cannot take parameters

success

No

Callback function for successful interface call

fail

No

Callback function for failed interface call

complete

No

The callback function at the end of the interface call (will be executed if the call is successful or failed)

示例代码：

{
 "tabBar": {
 "list": [{
  "pagePath": "index",
  "text": "首页"
 },{
  "pagePath": "other",
  "text": "其他"
 }]
 }
}

wx.switchTab({
 url: '/index'
})

（4）wx.navigateBack(OBJECT)

关闭当前页面，返回上一页面或多级页面。可通过 getCurrentPages()) 获取当前的页面栈，决定需要返回几层。

OBJECT 参数说明：

参数	类型	必填	说明
delta	Number	1	返回的页面数，如果 delta 大于现有页面数，则返回到首页。

示例代码：

// 注意：调用 navigateTo 跳转时，调用该方法的页面会被加入堆栈，而 redirectTo 方法则不会。见下方示例代码

// 此处是A页面
wx.navigateTo({
 url: 'B?id=1'
})

// 此处是B页面
wx.navigateTo({
 url: 'C?id=1'
})

// 在C页面内 navigateBack，将返回A页面
wx.navigateBack({
 delta: 2
})

（5）使用0e1e9be57d3815196e4c83d329f1e05f标签实现页面跳转

navigator

页面链接。

参数	类型	必填	说明
url	String		应用内的跳转链接
redirect	Boolean	false	打开方式为页面重定向，对应 wx.redirectTo（将被废弃，推荐使用 open-type）
open-type	String	navigate	可选值 ‘navigate'、'redirect'、'switchTab'，对应于wx.navigateTo、wx.redirectTo、wx.switchTab的功能
hover-class	String	navigator-hover	指定点击时的样式类，当hover-class=”none”时，没有点击态效果
hover-start-time	Number	50	按住后多久出现点击态，单位毫秒
hover-stay-time	Number	600	手指松开后点击态保留时间，单位毫秒

示例代码：

<navigator url="navigate?title=navigate" hover-class="navigator-hover">跳转到新页面</navigator>
 <navigator url="redirect?title=redirect" open-type="redirect" hover-class="other-navigator-hover">在当前页打开</navigator>
 <navigator url="index" open-type="switchTab" hover-class="other-navigator-hover">切换 Tab</navigator>

3.页面的路由和生命周期

（1）页面的路由

在小程序中所有页面的路由全部由框架进行管理，对于路由的触发方式以及页面生命周期函数如下：

路由方式	触发时机	路由后页面	路由前页面
初始化	小程序打开的第一个页面	onLoad，onShow
打开新页面	调用 API wx.navigateTo 或使用组件	onLoad，onShow	onHide
页面重定向	调用 API wx.redirectTo 或使用组件	onLoad，onShow	onUnload
页面返回	调用 API wx.navigateBack 或用户按左上角返回按钮	onShow	onUnload（多层页面返回每个页面都会按顺序触发onUnload）
Tab 切换	调用 API wx.switchTab 或使用组件 或用户切换 Tab	各种情况请参考下表

Tab 切换对应的生命周期（以 A、B 页面为 Tabbar 页面，C 是从 A 页面打开的页面，D 页面是从 C 页面打开的页面为例）：

当前页面	路由后页面	触发的生命周期（按顺序）
A	A	Nothing happend
A	B	A.onHide(), B.onLoad(), B.onShow()
A	B（再次打开）	A.onHide(), B.onShow()
C	A	C.onUnload(), A.onShow(）
C	B	C.onUnload(), B.onLoad(), B.onShow()
D	B	D.onUnload(), C.onUnload(), B.onLoad(), B.onShow()
D（从分享进入）	A	D.onUnload(), A.onLoad(), A.onShow()
D（从分享进入）	B	D.onUnload(), B.onLoad(), B.onShow()

4.参数传递

（1）通过路径传递参数

通过路径传递参数在wx.navigateTo(OBJECT)、wx.redirectTo(OBJECT)和0e1e9be57d3815196e4c83d329f1e05f中使用方法相同
示例代码：以wx.navigateTo为代表

"
wx.navigateTo({
 url: 'test?id=1'//实际路径要写全
})

//test.js
Page({
 onLoad: function(option){
 console.log(option.id) 
 }
})

参数与路径之间使用?分隔，参数键与参数值用=相连，不同参数用&分隔；

test?id=1 中id为参数键，1 为参数值

在目的页面中onLoad（）方法中option对象即为参数对象，可以通过参数键来取出参数值

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