Vue.js form verification: How to effectively deal with deep nested array data update and verification failure problems?

Vue.js form verification: dealing with the problem of updating deep nested array data

In Vue.js form development, verification of complex data structures (such as multi-layer nested arrays) often presents challenges. After modifying deep nested array data, the verification rules may not respond to update in time, resulting in verification failure. This article analyzes this problem and provides solutions.

The problem stems from the limitations of Vue.js responsive systems when dealing with deep nested arrays. Directly modify the properties of objects in the array, Vue.js may not be able to detect changes. For example, the dataForm.newAttributeList array contains multiple objects, each object in turn contains an array of attributeValues , and each object in attributeValues ​​contains an attributeValue attribute that needs to be checked. After modifying attributeValue , the view is not updated in time, and the verification rule cannot obtain the latest data. Even if the view is forced to be updated, the required verification may be invalid.

The core problem lies in the responsive mechanism of Vue.js. v-model binds item.attributeValue , but prop attribute of el-form-item points to the computed attribute: newAttributeList[${index1}].attributeValues[${index}].attributeValue . Although it seems to point to the same data, Vue.js' responsive system is based on objects and directly modifyes the properties of objects in the array, and Vue.js may not be able to capture changes.

The following methods ensure that Vue.js correctly tracks data changes:

1. Use this.$set or Vue.set : Use this.$set or Vue.set to modify the properties of objects in the array, forcing view updates and responsive system updates. For example:

 attributeValueChange(event, index1, index) {
  this.$set(this.dataForm.newAttributeList[index1].attributeValues[index], 'attributeValue', event);
}

2. Use objects to replace objects in the array: Replace each object in the attributeValues ​​array with an object with a unique key, improving the efficiency of Vue.js tracking changes.

3. Reassign array: In the attributeValueChange function, create a new attributeValues ​​array, copy the modified data, and assign the new array to this.dataForm.newAttributeList[index1].attributeValues ​​. This method is more direct, but may be less efficient.

4. Check prop attribute: Make sure prop attribute of el-form-item is correctly bound to item.attributeValue and avoid using computed attributes. This requires tuning the data structure so that v-model and prop directly access the verification data.

Which method to choose depends on the actual situation of the project and the code structure. Be sure to choose the optimal solution based on the actual code and data structure to ensure the accuracy of form verification.

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