Vue Quick Shot - Using a Loading Message

Vue Quick Shot - Using a Loading Message

Well, my grand plan to do one blog post per day of Vue quick tips failed rather quickly, but I can get two out today and get back on track. Honest, I can. While I wasn't planning on making every tip link to the previous one, my first two tips do exactly that.

My first tip explained how to disable a submit button while you waited for an Ajax call to finish. (Or any async call, and I actually used window.setTimeout instead of Ajax.) Today's tip builds on that by adding a rather simple, but helpful, modification - a loading message.

In the previous example, when you hit the submit button I disabled it while we waited for the result. You can see that in the CodePen below.

See the Pen Disable submit v2 by Raymond Camden (@cfjedimaster) on CodePen.

While the disabled button lets the user know something is going on, it would be nice to be a bit more obvious. First, let's add a new conditional div to the layout:

<div id="app" v-cloak>
  <form @submit.prevent="doSearch">
    <input type="search" v-model="term" placeholder="Search">
    <input type="submit" value="Perform Search" :disabled="searchDisabled">
  </form>
  
  <div v-if="searching">
    <p><i>Please stand by, I'm searching...</i></p>
  </div>

  <div v-if="result">
  <p>
    <b>The result: </b>
  </p>
  </div>
</div>

Right in the middle you can see a new condition, v-if="searching" and a message inside. You could also generate an Ajax loader if you want...

Ajax loader

I then tweaked my JavaScript a little bit:

Vue.config.productionTip = false;
Vue.config.devtools = false;

const app = new Vue({
  el:'#app',
  data: {
    term:'',
    result:'',
    searchDisabled:false,
    searching:false
  },
  methods:{
    async doSearch() {
     if(this.term === '') return; 
     console.log(`search for ${this.term}`);
     //disable the button
     this.searchDisabled = true;
     // clear previous result
     this.result = '';
     this.searching = true;
     this.result = await searchMyAPI(this.term);
     //re-enable the button
     this.searchDisabled = false;
     this.searching = false;
    }
  }
})

async function searchMyAPI(s) {
  return new Promise((resolve, reject) => {
    window.setTimeout(() => {
      resolve(`something for ${s}`);
    }, 3000);
  });
}

I added a default value for searching and within doSearch, I set it to true before the search and back to false after. Here's a CodePen you can test with:

See the Pen Loading Message by Raymond Camden (@cfjedimaster) on CodePen.

That's it for this tip. I'll have the next one up later today, and hopefully, one more for Thursday and Friday. Enjoy!

Raymond Camden's Picture

About Raymond Camden

Raymond is a developer advocate. He focuses on JavaScript, serverless and enterprise cat demos. If you like this article, please consider visiting my Amazon Wishlist or donating via PayPal to show your support. You can even buy me a coffee!

Lafayette, LA https://www.raymondcamden.com

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