What to do if uniapp two-way data binding fails

When developing uniapp, we often use two-way data binding to achieve real-time updates of data. But sometimes, we find that the two-way data binding fails, causing the data to not be updated normally. So, what is the reason for this situation? How to solve it?

First of all, we need to clarify the two-way data binding principle of uniapp. uniapp is implemented based on Vue's two-way data binding. In uniapp, we implement two-way data binding through the v-model directive. When we enter content in the input box, the value in the input box will be synchronized to the data in real time, and when the value in the data changes, the content in the input box will also be updated in real time. Therefore, the implementation of v-model relies on the responsive nature of the data.

So, why does the two-way data binding fail?

1. Data is not responsive

In uniapp, only the data defined through the data attribute when the page is initialized is responsive. If an object or array is dynamically created to store data when writing code, then the object or array is not reactive, and two-way data binding cannot be achieved.

Solution:
You can convert dynamically created objects or arrays into responsive data through the Vue.set or this.$set method.

2. Too many data nesting levels

When there are too many data nesting levels, uniapp's two-way data binding will also fail. The specific situation is that when the number of data nesting levels is greater than or equal to 10, two-way data binding will fail.

Solution:
This problem can be solved by splitting the nested data into multiple independent data.

3. Data object changes

When we want to dynamically change the properties of an object, if we directly use assignment, the data object will change, and the two-way data binding will be invalid. .

Solution:
Use Vue.set or this.$set method to dynamically change the properties of the object.

The above are some reasons and solutions for the failure of uniapp two-way data binding. During the development process, we should pay attention to the above issues to avoid two-way data binding failure.

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