This hook is triggered before deleting child-object data, including batch deletion. It allows extra business actions before deletion, including but not limited to intercepting deletion.

• Intercept deletion of child-object data

Parameters

Parameter	Description	Type
Common parameters	See details	--
objApiName	Child object apiName	String
recordType	Child object record type	String
delDatas	Child-object data being deleted	Array

Return Value

None

Basic Example

Require users to fill in a deletion reason before deleting child-object data

Requirement description: when employees delete existing child-object data, they must first fill in a deletion reason, then perform the deletion, and the system records the deleted items and reasons.

import resonInputDialog from './resonInput';
const ResonInputDialog = Vue.extend(resonInputDialog);
export default class Plugin {
    apply() {
        return [{
            event: 'md.del.before',
            functional: this.mdDelBefore.bind(this)
        }]
    }
    mdDelBefore(context, plugin) {
        return new Promise(resolve => {
        	const { delDatas = [] } = context;
            const delIds = delDatas.filter(item => item._id);

            if(delIds.length){
                const div = document.createElement('div');
                document.body.appendChild(div);

                const dialog = this.instance = new ResonInputDialog({
                    el: div,
                    propsData: {
                        mainId: data._id || '',
                        delIds: delIds,
                        success: () => {
                          destroy();
                          resolve();
                        },
                        fail: () => {
                           destroy();
                           reject();
                        }
                    }
                });
                return;
            }
        })
    }
    destroy(){
        if(this.instance){
            this.instance.$destroy();
            this.instance = null;
        }
    }
}

Notes

1. Child-object data obtained through context APIs in this hook does not include the deleted data

When object data is retrieved through context APIs in this hook, the data has already been deleted, so the APIs can no longer find it.