Why can't nested subroutines take effect in React Router 4.3?如何解决这个问题？

React Router 4.3 Nested Router Failure and Solution

When building nested routes using React Router 4.3, you often encounter the problem that subroutines cannot work properly. This article will use a case analysis and provide effective solutions.

Problem description:

The user has added a tab menu in the /course/coursedetails page, hoping to click the menu to switch different contents. Accessing /course/coursedetails is normal, but when switching to /course/coursedetails/coursecatalog , a 404 error occurred. The user has removed exact attributes of the parent and child routes, but the parent component has not responded to the routing changes.

Code example:

app.js (routing configuration):

<route component="{Course}" path="/course"></route>

coursedetails.js (subrouting configuration):

<route component="{CourseDetails}" path="/course/coursedetails"></route>
<route component="{CourseCatalog}" path="/course/coursedetails/coursecatalog"></route>

Problem analysis and solution:

The root cause of the problem lies in the routing matching mechanism of React Router 4.3. When the parent route has the exact attribute set, even if the child route path matches it, the parent route will be matched first, resulting in the child route not being effective. Even if the exact attribute is removed, it can cause problems if the route definition is incorrect.

Solution:

1. Remove the exact attribute of the parent route (if it exists): Ensure the parent route ( /course )<route></route> Components do not have exact attributes. This allows the parent route to match longer paths, allowing the child route to work properly.

2. Adjust route definition order: Make sure that the child route is defined after the parent route. React Router matches in the defined order.

Modified code example:

app.js: (No modification is required, because there is no exact attribute in the example)

<route component="{Course}" path="/course"></route>

coursedetails.js: (No modification is required, if the child route is defined after the parent route)

<route component="{CourseDetails}" path="/course/coursedetails"></route>
<route component="{CourseCatalog}" path="/course/coursedetails/coursecatalog"></route>

If the problem persists, please check the following:

• The path is correct: Double check the spelling and case of the route path.
• Component import: Make sure that Course , CourseDetails , CourseCatalog components are imported correctly.
• Switch component: If used<switch></switch> Component, make sure the child route is defined after the parent route.<switch></switch> Match only the first matched route.

Through the above adjustments, the /course/coursedetails/coursecatalog path should work properly to avoid 404 errors. If the problem persists, provide a complete code snippet for more detailed analysis.

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