Vue 3 Form Submission with Async Validation: Handling Race Conditions in API Responses
Could someone explain Does anyone know how to I'm trying to implement I've been struggling with this for a few days now and could really use some help. I'm sure I'm missing something obvious here, but I'm stuck on something that should probably be simple. I'm encountering a strange issue with form submission in my Vue 3 application that uses async validation for a registration form. I have a form with a username field that checks for uniqueness against an API. When the user types in the username and submits the form quickly, sometimes I get a validation error stating that the username is already taken even when it is not. This seems to be a race condition where the async call hasn't resolved before the submission is processed. Here’s a simplified version of my component: ```vue <template> <form @submit.prevent="submitForm"> <input v-model="username" @blur="validateUsername" /> <span v-if="usernameError">{{ usernameError }}</span> <button type="submit">Register</button> </form> </template> <script> export default { data() { return { username: '', usernameError: null, }; }, methods: { async validateUsername() { this.usernameError = null; // reset error try { const response = await fetch(`https://api.example.com/check-username?username=${this.username}`); const data = await response.json(); if (!data.available) { this.usernameError = 'Username is already taken.'; } } catch (error) { console.error('Error validating username:', error); } }, async submitForm() { await this.validateUsername(); // make sure to validate before submitting if (this.usernameError) { return; // prevent form submission if there's an error } // proceed with form submission to the relevant API // ... }, }, }; </script> ``` I've tried adding a debounce mechanism to the `validateUsername` function, but I still see the occasional race condition when the user submits the form before the validation completes. Here’s the debounce implementation I attempted: ```javascript validateUsername: _.debounce(async function() { // validation logic }, 300), ``` However, it doesn’t seem to fully prevent the issue. I want to ensure that the form only submits when the validation is completely resolved. Is there a better way to handle this scenario in Vue 3? Any insights or best practices to manage such async operations effectively would be greatly appreciated! Thanks in advance! For context: I'm using Vue on Ubuntu. What am I doing wrong? I'm working on a CLI tool that needs to handle this. What am I doing wrong? For context: I'm using Vue on Ubuntu 22.04. Any examples would be super helpful. The stack includes Vue and several other technologies. Any feedback is welcome! I'm developing on Windows 11 with Vue.