Showcasing a visual loading sequence while a Vue.js operation is in progress

Question

Showcasing a visual loading sequence while a Vue.js operation is in progress

An issue arises with the simple show and hide functionality on the loading element while executing a Vue js function.

The Vue js function is designed to perform certain tasks and update data upon completion. In an attempt to display a loading animation during this process, I have simplified the process by using a basic loop for discussion purposes, eliminating other potential issues such as ajax or async operations.

Here is the HTML code for the button:

<button type="button" v-on:click="DoStuff()">Do Stuff</button>

And here is the corresponding vue js code:

var client = new Vue({
    el: '#client',
    data: {
        someData: []
},
methods: {
    DoStuff: function() {

        //Show Loader
        $(".loader").show();

        //Simulate delay 
        for (var i = 0; i < 100000000; i++) {
            var x = i;
        }

        //Hide loader
        $(".loader").hide();

        // Notify user when done.
        alert('Task complete');
    }

However, the loader fails to appear. If I disable the hide command, the loader appears only after the alert, indicating a possible underlying asynchronous operation despite not intentionally implementing any async procedures.

javascript vue.js loading

Answer 1

Answer №1

Why rely on jQuery to show and hide elements based on conditions when VueJS and similar front-end frameworks can handle this task more efficiently?

To start, include a loading property in your data object:

data: {
   someData: [],
   loading: false
}

Next, in your doStuff function, eliminate the jQuery code and update the loading property accordingly:

methods: {
    doStuff: function() {
        //Display Loader
        this.loading = true;

        //Simulate 5-second delay
        setTimeout(() => {
           this.loading = false;
        }, 5000)
    }
}

Lastly, in your view, add this line:

<div v-if="loading">Loading data</div>

I'd also like to point out that your snippet seems slightly off. The methods property should be inside the Vue instance definition.

var client = new Vue({
    el: '#client',
    data: {
        someData: [],
        loading: false
    },
    methods: {
       doStuff: function() {
          //Display Loader
          this.loading = true;

          //Simulate 5-second delay
          setTimeout(() => {
            this.loading = false;
          }, 5000)
       }

   }
}

Answer 2

Why rely on jQuery to show and hide elements based on conditions when VueJS and similar front-end frameworks can handle this task more efficiently?

To start, include a loading property in your data object:

data: {
   someData: [],
   loading: false
}

Next, in your doStuff function, eliminate the jQuery code and update the loading property accordingly:

methods: {
    doStuff: function() {
        //Display Loader
        this.loading = true;

        //Simulate 5-second delay
        setTimeout(() => {
           this.loading = false;
        }, 5000)
    }
}

Lastly, in your view, add this line:

<div v-if="loading">Loading data</div>

I'd also like to point out that your snippet seems slightly off. The methods property should be inside the Vue instance definition.

var client = new Vue({
    el: '#client',
    data: {
        someData: [],
        loading: false
    },
    methods: {
       doStuff: function() {
          //Display Loader
          this.loading = true;

          //Simulate 5-second delay
          setTimeout(() => {
            this.loading = false;
          }, 5000)
       }

   }
}

Answer 3

Answer №2

Avoid using jquery in this situation, as you can achieve the desired functionality with vuejs.


var app = new Vue({
    el: '#app',
    data: {
        myData: [],
        showLoader: false,
},
methods: {
    HandleAction() {

        //Display Loader
        this.showLoader = true;

        //Simulate 5 seconds delay

        //Hide loader after processing
        this.showLoader = false;

        // Let the user know it's completed.
        alert('Done');
    }

Here is your corresponding HTML code snippet.

<div class="loader" v-if="showLoader">
    Loading....
</div>
<div v-else>
Content of your webpage 
</div>

Answer 4

Avoid using jquery in this situation, as you can achieve the desired functionality with vuejs.


var app = new Vue({
    el: '#app',
    data: {
        myData: [],
        showLoader: false,
},
methods: {
    HandleAction() {

        //Display Loader
        this.showLoader = true;

        //Simulate 5 seconds delay

        //Hide loader after processing
        this.showLoader = false;

        // Let the user know it's completed.
        alert('Done');
    }

Here is your corresponding HTML code snippet.

<div class="loader" v-if="showLoader">
    Loading....
</div>
<div v-else>
Content of your webpage 
</div>

Answer 5

Answer №3

Avoid using JQuery and opt for Vue conditional displaying with v-show instead.

When creating your loader:

<div class="loader" v-show="loading"></div>

Incorporate the following Vue code:

var app = new Vue({
    el: '#app',
    data: {
        dataItems: [],
        loading: false
},
methods: {
    PerformAction: function() {

        this.loading = true;

        //Simulate a delay of 5 seconds
        for (var i = 0; i < 100000000; i++) {
            var x = i;
        }

        this.loading = false;

        // Display a message indicating completion
        alert('Task completed');
    }

Answer 6

Avoid using JQuery and opt for Vue conditional displaying with v-show instead.

When creating your loader:

<div class="loader" v-show="loading"></div>

Incorporate the following Vue code:

var app = new Vue({
    el: '#app',
    data: {
        dataItems: [],
        loading: false
},
methods: {
    PerformAction: function() {

        this.loading = true;

        //Simulate a delay of 5 seconds
        for (var i = 0; i < 100000000; i++) {
            var x = i;
        }

        this.loading = false;

        // Display a message indicating completion
        alert('Task completed');
    }

Answer 7

Answer №4

Appreciate everyone's input. Currently, I need to shift my focus to addressing a more pressing feature that has arisen. However, I still wanted to share the insights I've gathered so far. While this may not be the ultimate solution, it certainly sheds light on the issue and suggests the correct approach.

Andrew Lohr accurately pinpointed the problem, which is elaborated further in this thread: jQuery hide() and show() not immediately run when reversed later in the function

One possible solution, among others, involves utilizing an event bus, as suggested by perellorodrigo in this resource: https://flaviocopes.com/vue-components-communication/

I will share my final resolution once I have had the opportunity to work on it.

Answer 8

Appreciate everyone's input. Currently, I need to shift my focus to addressing a more pressing feature that has arisen. However, I still wanted to share the insights I've gathered so far. While this may not be the ultimate solution, it certainly sheds light on the issue and suggests the correct approach.

Andrew Lohr accurately pinpointed the problem, which is elaborated further in this thread: jQuery hide() and show() not immediately run when reversed later in the function

One possible solution, among others, involves utilizing an event bus, as suggested by perellorodrigo in this resource: https://flaviocopes.com/vue-components-communication/

I will share my final resolution once I have had the opportunity to work on it.

Showcasing a visual loading sequence while a Vue.js operation is in progress

Answer №1

Answer №2

Answer №3

Answer №4

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