How to implement uniapp fallback calling method

In recent years, with the continuous development of mobile application development, uniapp has received more and more attention as a cross-platform application development framework. In the development process of uniapp, the rollback function is an essential function. To realize this function, the most important thing is to master the uniapp rollback calling method. This article will introduce in detail the implementation of the uniapp fallback calling method and related techniques, hoping to help developers who need to use this function.

1. Basic implementation of uniapp fallback calling method

Pages in uniapp can be page jumped through the uni.navigateTo, uni.redirectTo, and uni.reLaunch methods. In the process of jumping these pages, we often need to implement the page rollback function, and uniapp provides a wealth of page rollback calling methods. The following are commonly used:

1. uni.navigateBack : This method is used to close the current page and return to the previous page or multi-level page. The calling method is relatively simple and only needs to pass in an integer parameter. Indicates the number of levels returned, for example: uni.navigateBack(1) means returning to the previous page, uni.navigateBack(2) means returning to the previous two pages, and so on. It should be noted that the number of layers returned should not exceed the length of the current page stack, otherwise an error will occur.
2. uni.switchTab: This method is used to jump to the tabBar page and close all other non-tabBar pages. This method requires passing in a page path parameter, for example: uni.switchTab({url:'/pages/tabBar/index'}).
3. uni.reLaunch: This method is used to close all pages and open a certain page. This method requires passing in a page path parameter, for example: uni.reLaunch({url:'/pages/home/index'}).

It should be noted that the above methods are the core methods for handling page rollback in uniapp. Developers must pay attention to the correctness and rationality of the parameters passed when using them.

2. Some tips about the uni.navigateBack method

The uni.navigateBack method is one of the most commonly used methods to implement uniapp page rollback. I believe many developers have also used it in practice. it. In fact, there are still some details and techniques in the uni.navigateBack method that we need to pay attention to. Let’s take a look below:

1. Used with the uni.onBackPress method

In some cases, we need to listen to the user’s back operation in order to do some other things business operations. At this time, you can use the uni.onBackPress method to monitor. This method needs to pass a callback function, which will be triggered when the user clicks the back button. In this callback function, we can intercept and process user operations.

2. Call the uni.navigateBack method in the subcomponent

In uniapp, if the subcomponent needs to perform page jump and rollback operations, it needs to pass uni.navigateTo, uni.redirectTo and other methods are called. However, in some cases, subcomponents also need to perform page rollback operations. In this case, the uni.navigateBack method can be used. To call the uni.navigateBack method in a subcomponent, you need to use the uni.$emit method for event triggering. For example, you can write this in the child component:

this.$emit('back');

In the parent component, we need to listen to this event and call uni when the event is triggered. The .navigateBack method performs page rollback operations. The specific code is as follows:

<script> <br> export default{</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">methods:{   back(){     uni.navigateBack({       delta: 1     })   } }</pre><div class="contentsignin">Copy after login</div></div> <p>}<br></script>

3. Summary

Through the introduction of this article, I believe everyone has mastered uniapp rollback Implementation methods and related techniques for calling methods. In the uniapp development process, the rollback function is very important and requires us to design and implement it carefully. I hope everyone can apply what they have learned in development and make efficient and excellent products.

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