Error in Vue.js: "Trying to access properties of an object that is undefined (specifically '$refs')"

When we trigger methods from a parent component in a child component, we use the following code:

await this.$refs.patientinputmask.$refs.patientpersonaldata.ChangePersonalData();
await this.$refs.patientinputmask.$refs.patientaddressdata.SavePersonalAddressObject();
await this.$refs.patientinputmask.$refs.patientbankaccountdata.SavePersonalBankAccountObject();
await this.$refs.patientinputmask.$refs.patientrelatedcontacts.SaveRelatedContactObject();
if (this.invoiceHN == true) {
          await this.$refs.patientinputmask.$refs.invoicedata.$refs.invoiceHN.$refs.invoiceKasseHeaderHN.SavePatientDataForInvoice();
          await this.$refs.patientinputmask.$refs.invoicedata.$refs.invoiceHN.$refs.invoicingTemplateHN.SavePatientTemplateConfigDTO();
        }

Sometimes, an error occurs: [Vue warn]: Error in von handler (Promises/async): "TypeError: Cannot read properties of undefined (reading '$refs')", causing all function calls to fail and none of these methods are executed. The methods and data are located in the child components. What could be causing this issue?

javascriptvue.js

Answer №1

It seems like there may be an issue with the child components not being fully mounted when your code runs. Have you considered when exactly you are executing this code on the parent element?

One approach could be to have each child component emit an event upon mounting, and then proceed with running your code once all child components have been successfully mounted.

<child-component @hook:mounted="doSomething" />

(This concept is illustrated in this example: Vue JS 2.0 Child Component Mounted Callback)

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