Vue form verification: Cleverly deal with the problem of updating deep nested array data

In Vue form development, handling form verification of complex data structures such as multi-layer nested arrays or objects is often a headache. The problem of verification rules failure is particularly difficult when deep nested array data is updated. This article provides effective solutions to this problem.

Problem description: When a form contains deeply nested arrays, such as a two-dimensional array or an array of object sets, directly modifying the value of the array elements, Vue's responsive system may not be able to capture the changes, resulting in the invalidation of the verification rule, which is useless even if the view is forced to be updated.

In the code example, the form verification is performed using el-form-item component, and v-model is bound to item.attributeValue . Although the attributeValueChange method is used to update data, due to the limitations of Vue responsive systems when processing deeply nested data, direct modification may not trigger verification. prop attribute dynamically binds the array element path: newAttributeList[${index1}].attributeValues[${index}].attributeValue , further increasing the complexity of the problem.

Solution:

The key is to ensure that Vue can track changes in the data. The following methods are available:

1. Using this.$set or Vue.set : Directly modifying the value of an array element does not guarantee that Vue can detect changes. Use this.$set(this.dataForm.newAttributeList[index1].attributeValues[index], 'attributeValue', newValue) or Vue.set methods to force Vue updates to ensure that the responsive mechanism takes effect.

2. Use Object.assign or expand operator: If item.attributeValue is an object, modifying its attributes directly may be invalid. Use Object.assign or expand operator to create a new object and replace the original object to trigger a responsive update of Vue.

3. Verify the responsiveness of the data structure: Make sure that dataForm.newAttributeList and the objects in the attributeValues ??array are responsive. If not, Vue will not be able to track changes.

4. Use this.$forceUpdate() with caution: As a last resort, you can use this.$forceUpdate() to force the component to re-render. However, frequent use will affect performance and should be avoided as much as possible.

Choosing the right solution depends on the specific code and data structure. Priority is given to solutions with better performance and more in line with project requirements. Through the above methods, the problem of invalidation of the verification rules after the deep nested array data is updated in Vue form verification, ensuring the reliability of the form verification.

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