What is the best way to handle waiting for a request and user input simultaneously?

Question

What is the best way to handle waiting for a request and user input simultaneously?

Imagine a scenario where a component loads and initiates an asynchronous request. This component also includes a submit button that, when clicked by the user, triggers a function that depends on the result of the initial request. How can I ensure that this triggered function is delayed until the asynchronous request is complete?

To illustrate, let's consider the example of MyComponent, which performs an async request using getRandomColor() upon being mounted. The template of MyComponent contains a

<button @click="handleClick">

element. The handleClick function then calls another function called saveColor(). How can I guarantee that saveColor() is only executed after the completion of the async getRandomColor() call?

I am currently working with Vue.js, but I believe this question pertains to all JavaScript development.

javascript vue.js asynchronous

Answer 1

Answer №1

To enable or disable a button based on a response, you can include the :disabled attribute in your button element. If there is a response, the button will be enabled; otherwise, it will be disabled.

Here is a working demo:

const app = Vue.createApp({
  el: '#app',
  data() {
    return {
        buttonText: 'Call Me!',
      apiResponse: [],
      isDisabled: false
    }
  },
  methods: {
    saveColor() {
        console.log('saveColor method call');
    }
  },
  mounted() {
    axios.get("https://jsonplaceholder.typicode.com/users").then(response => {
      this.apiResponse = response.data;
    }).catch((error) => {
        console.warn('API error');
        });
  }
})
app.mount('#app')

<script src="https://unpkg.com/vue"></script>
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>

<div id="app">
  <button v-on:click="saveColor()" :disabled="!apiResponse.length">{{ buttonText }}</button>
</div>

Based on a comment by the author of the post, below is an alternative snippet:

If you prefer not to use a disabled button and want the button handler to wait for the request to finish before continuing execution, you can try the following approach:

const app = Vue.createApp({
  el: '#app',
  data() {
    return {
        buttonText: 'Call Me!',
      apiResponse: [],
      isDisabled: false
    }
  },
  methods: {
    saveColor() {
        console.log('saveColor method call');
    }
  },
  mounted() {
    axios.get("https://jsonplaceholder.typicode.com/users").then(response => {
      this.apiResponse = response.data;
    }).catch((error) => {
        console.warn('API error');
        });
  }
})
app.mount('#app')

<script src="https://unpkg.com/vue"></script>
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>

<div id="app">
  <button v-on:click.prevent="apiResponse.length ? saveColor() : {}">{{ buttonText }}</button>
</div>

Answer 2

To enable or disable a button based on a response, you can include the :disabled attribute in your button element. If there is a response, the button will be enabled; otherwise, it will be disabled.

Here is a working demo:

const app = Vue.createApp({
  el: '#app',
  data() {
    return {
        buttonText: 'Call Me!',
      apiResponse: [],
      isDisabled: false
    }
  },
  methods: {
    saveColor() {
        console.log('saveColor method call');
    }
  },
  mounted() {
    axios.get("https://jsonplaceholder.typicode.com/users").then(response => {
      this.apiResponse = response.data;
    }).catch((error) => {
        console.warn('API error');
        });
  }
})
app.mount('#app')

<script src="https://unpkg.com/vue"></script>
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>

<div id="app">
  <button v-on:click="saveColor()" :disabled="!apiResponse.length">{{ buttonText }}</button>
</div>

Based on a comment by the author of the post, below is an alternative snippet:

If you prefer not to use a disabled button and want the button handler to wait for the request to finish before continuing execution, you can try the following approach:

const app = Vue.createApp({
  el: '#app',
  data() {
    return {
        buttonText: 'Call Me!',
      apiResponse: [],
      isDisabled: false
    }
  },
  methods: {
    saveColor() {
        console.log('saveColor method call');
    }
  },
  mounted() {
    axios.get("https://jsonplaceholder.typicode.com/users").then(response => {
      this.apiResponse = response.data;
    }).catch((error) => {
        console.warn('API error');
        });
  }
})
app.mount('#app')

<script src="https://unpkg.com/vue"></script>
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>

<div id="app">
  <button v-on:click.prevent="apiResponse.length ? saveColor() : {}">{{ buttonText }}</button>
</div>

What is the best way to handle waiting for a request and user input simultaneously?

Answer №1

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