Why are nested subroutines not effective in React Router 4.3 and how to solve this problem?

React Router 4.3 Detailed explanation of nested routing configuration and problem investigation

When building applications using React Router 4.3, the correct configuration of nested routing is crucial. This article will analyze a common nested routing failure problem and provide effective solutions.

Suppose you want to nest a subroutine /course/coursedetails /course/coursedetails/coursecatalog path, but you get a 404 error when accessing the subroutine. This is usually caused by the parent route having exact attribute configured.

Let's analyze a typical misconfiguration:

Example of Error Configuration:

Assume that the configuration of the parent route in app.js is as follows:

 // app.js
<route exact path="/course/coursedetails" component="{CourseDetails}"></route>

The subroutine configuration inside CourseDetails.js component is as follows:

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

Since the parent route in app.js uses the exact attribute, React Router will accurately match the /course/coursedetails path. When accessing /course/coursedetails/coursecatalog , React Router does not continue to match the subroutine downwards due to the incomplete matching of the parent route, resulting in a 404 error.

Solution:

The solution is simple, just remove exact attribute in the parent route:

Example of correct configuration:

Modify the parent route configuration in app.js :

 // app.js
<route path="/course/coursedetails" component="{CourseDetails}"></route>

The subroutine configuration in CourseDetails.js remains unchanged:

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

By removing the exact attribute, React Router will first match the parent route /course/coursedetails , and then continue to match its child route /course/coursedetails/coursecatalog , thereby rendering the sub-routing component correctly.

I hope the above analysis and solutions can help you solve the problem of nested routing failure in React Router 4.3. Make sure the path is case consistent and check if the component name matches the routing configuration.

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