How to delete page stack in uniapp

In uniapp, we can jump between pages by opening a new page, and in the new page, we can use the return button to return to the previous page. However, in some scenarios we may need to delete some pages in the page stack so that users cannot return to deleted pages through the return button. This article will introduce how to delete pages in the page stack in uniapp.

1. What is a page stack

In uniapp, each application has a page stack to store open pages. The page stack is a last-in-first-out stack structure. When we open a new page, the page will be pushed into the page stack and become the current page. When we return to the previous page, the current page will be popped out of the page stack. And destroyed, making the previous page become the current page again.

2. Why do we need to delete pages in the page stack

In some scenarios, we may need to delete some pages in the page stack, for example:

1. Prevent users from repeatedly submitting the form: After the user submits the form, we can delete the previous page from the page stack when opening a new page, so that the user cannot resubmit the form through the return button.
2. Prevent users from returning to certain pages: When we need to do some security operations on some pages (such as login, payment, etc.), we can delete the previous pages from the page stack when opening these pages , so that the user cannot return to the page before the safe operation through the back button.

3. How to delete pages in the page stack

In uniapp, we can use the uni.navigateBack() method to return to the previous page, and this method can accept a parameter delta, indicating the number of pages to return. For example, when delta is 1, it means returning to the previous page, when delta is 2, it means returning to the previous page, and so on.

So, how to delete pages in the page stack? In fact, we only need to set the delta value of the new page when opening the new page. For example, when we need to delete the last page in the page stack, we can write the code like this:

uni.navigateTo({
  url: '/pages/newPage/newPage?delta=2'
})

In the above code, we open a new page named newPage and set delta to 2, so After opening the newPage page, the last page in the page stack will be deleted, making newPage the current page.

4. Summary

This article mainly introduces the method of deleting the page stack in uniapp. By deleting pages in the page stack, we can improve user experience and ensure the security of user information in some scenarios. At the same time, it should be noted that when deleting pages in the page stack, we need to pay attention to the dependencies between pages to ensure that deleting pages will not affect the use of other pages.

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