How to solve the problem of uniapp not rendering the page after getting the data

In mobile application development, uniapp has attracted more and more attention and favor from developers because of its cross-platform features and efficient development methods. However, when using uniapp to develop applications, sometimes we encounter situations where we get the data but cannot render the page. Let’s take a look at the solution to this situation.

1. Check the data format

uniapp can use the data binding technology of vue.js to achieve page rendering, but when using data binding, you need to ensure that the data format is correct, otherwise it cannot be rendered. page. For example, if we use the v-for instruction to loop through rendering data, the data must be an array; if we use the v-if instruction to determine rendering conditions, the data must be a Boolean value. Therefore, after getting the data, you must first check whether the data format is correct.

2. Check whether the data is empty

If the data we get is an empty object or array, there will be no content when rendering the page. Therefore, after getting the data, you need to check whether the data is empty. If it is empty, you need to process it, such as setting a default value for the data or adding prompt information to the page.

3. Check whether the data is obtained asynchronously

In uniapp, obtaining data usually uses asynchronous requests, such as using the uni.request() method. However, if the data has not been returned when we render the page, the page will not be rendered. Therefore, when obtaining data, ensure that the data has been returned before rendering the page.

4. Use the v-if/v-else directive in the page

In some complex pages, there may be multiple data requests. If the data request is successful, it will be rendered. page, then the user experience will be poor. Therefore, in the page, you can use the v-if and v-else instructions to determine whether the data has been returned. If the data has been returned, the page will be rendered, otherwise the prompt of data loading will be displayed.

5. Use the onLoad life cycle method in the page

In uniapp, the page has many life cycle methods, such as onLoad, onReady, onShow, etc. Among them, the onLoad method will be executed when the page is loaded, and the onShow method will be executed when the page is displayed. Therefore, after obtaining the data, you can render the page in the onLoad life cycle method to ensure that the data has been returned before rendering the page.

Summary

In uniapp development, it is a common situation to get data but be unable to render the page. In order to solve this problem, we can optimize from the aspects of data format, whether the data is empty, whether the data is obtained asynchronously, using v-if/v-else instructions and using the onLoad life cycle method. The above are some common solutions, I hope they will be helpful to everyone.

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