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Vue.js nextTick

By Sivaraman VSivaraman V

Vue.js nextTick

Introduction to Vue.js nextTick

Vue.js nextTick is one of the global api in vue.js it mainly defers the callback method for executing the dom(document object method) lifecycle of the javascript it continuously execute the dom methodology one after another because it uses immediately after another when we have changed some user-define datas to be waited for the dom model updates the vue javascript framework performs the dom updates in asynchronously method it can be used to keeping some data updated for storing purpose until they needs to be updated and applied it also it will be created the data queues in dom upgraded versions.

Syntax

In vue.js has some default methods for achieving application logics in both the front end and back end. The dom elements will use some built-in methods like mounted() and $nextTick() these two methods are rendering the components whenever its not completed the $nextTick() runs in the method.

<html>
<body>
<script>
const variablename= Vue.component('variablename',
template:{{
----some logics---
}},
data:function()
{
------some javascript vue based logic codes----
}
this.$nextTick(()=>{
----some logics-----
})
Vue.nextTick().then(function()
{
---some logics like dom updation in the pages---
}
</script>
</body></html>

Above code is the basic syntax for while rendering the vue components in the script for UI end by using the default method called $nextTick() because it is used for changing the datas in the dom after we have changed in the some other areas in the Vue codes.

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How nextTick Works in Vue.js?

We know that the nextTick() is one of the default method and it’s a Global API for changing the data elements in the application and the vue.js is used for changing the same in the DOM elements whenever it needs in the data change on the browser but also noted that the browser has rendered in those elements will be changed on the web page. The file upload option is also available on this method in the vue scripts it can be called for the dom manipulations is either direct or indirect with while the changing height of the textboxes and other components may be depend upon the user input which is given to the UI elements.

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Some default methods in the parent-child relationships among the Vue method like nextTick() it uses some built-in child methods like concepts file, image uploads, etc by using the isFileUploaded method the statement will be validated, and the value is assigned to the variable which has followed with this method value should contain Boolean data type it will be either “True” or “False”.

When we take another scenario like image uploaded it will be either gif, jpg, etc also we should confirm whenever the image is uploaded it does not throw any errors like “invalid image or some UX problems, etc” because its frozen the web pages also noted that it can’t affect with the UI components of the page but time should be taken like miiliseconds(ms) to some more few seconds because it changed the states like frozen to start section of the web page console.

The Vue generally creates the queues for which create the buffer storages in all of the related datas if the data is changed that will have been applied within the same loop structure which is constructed in the code. If suppose we have used for loop for to iterate and store, retrieving the user inputs in the code the data changes sometimes have not been applied in the DOM yet, and while it applies them. The event loop is now “ticks” and the data queue changes is flushed in the data simplifications. Because the queue of data changes has not been applied yet in the DOM manipulations the reflected changes are not able to visible in the end users.

Examples of Vue.js nextTick

Given below are the examples of Vue.js nextTick:

Example #1

Code:

<html>
<head>
<title>Example</title>
<script type = "text/javascript" src = "js/vue.js"></script>
<script src="https://cdn.educba.com/js/vuejs/2.6.10/vue.js"></script>
<script src="basic.js"></script>
<script src="//unpkg.com/vue"></script>
<script type="text/javascript" src="//unpkg.com/vue-form-generator@2.0.0"></script>
<link rel="stylesheet" type="text/css" href="//unpkg.com/vue-form-generator@2.0.0/dist/vfg.css">
<link rel="stylesheet" type="text/css" href="style.css">
<script type="text/javascript" src="//rawgit.com/fergaldoyle/vue-form/master/dist/vue-form.min.js"></script>
<link rel="stylesheet" type="text/css" href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css">
</head>
<body>
<div id="first">{{ output }}</div>
<script>
var v = new Vue({
el: '#first',
data: {
output: 'Welcome User'
}
})
v.output = 'Welcome To My Domain';
document.write('Have a Nice Day:',v.$el.textContent);
v.$nextTick(function(){
document.write('Have a Nice day user:', v.$el.textContent)
})
</script>
</body>
</html>

Output:

Vue.js nextTick-1.1

Example #2

Code:

<html>
<head>
<title>Example</title>
<script type = "text/javascript" src = "js/vue.js"></script>
<script src="https://cdn.educba.com/js/vuejs/2.6.10/vue.js"></script>
<script src="basic.js"></script>
<script src="//unpkg.com/vue"></script>
<script type="text/javascript" src="//unpkg.com/vue-form-generator@2.0.0"></script>
<link rel="stylesheet" type="text/css" href="//unpkg.com/vue-form-generator@2.0.0/dist/vfg.css">
<link rel="stylesheet" type="text/css" href="style.css">
<script type="text/javascript" src="//rawgit.com/fergaldoyle/vue-form/master/dist/vue-form.min.js"></script>
<link rel="stylesheet" type="text/css" href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css">
</head>
<body>
<div id="first">{{ output }}</div>
<script>
var v = new Vue({
el: '#first',
template: '<p>{{ meth() }}</p>',
data: {
radians: Math.PI / 4,
rdius: 30,
x: 2
},
methods: {
meth: function () {
return Number(Math.cos(this.radians) * this.rdius + this.x).toFixed(4);
}
}
});
v.radians = 2;
console.log(v.$el.textContent);
Vue.nextTick(function () {
console.log(v.$el.textContent);
});
</script>
</body>
</html>

Output:

Vue.js nextTick-1.2

Example #3

Code:

<html>
<head>
<title>Example</title>
<script type = "text/javascript" src = "js/vue.js"></script>
<script src="https://cdn.educba.com/js/vuejs/2.6.10/vue.js"></script>
<script src="basic.js"></script>
<script src="//unpkg.com/vue"></script>
<script type="text/javascript" src="//unpkg.com/vue-form-generator@2.0.0"></script>
<link rel="stylesheet" type="text/css" href="//unpkg.com/vue-form-generator@2.0.0/dist/vfg.css">
<link rel="stylesheet" type="text/css" href="style.css">
<script type="text/javascript" src="//rawgit.com/fergaldoyle/vue-form/master/dist/vue-form.min.js"></script>
<link rel="stylesheet" type="text/css" href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css">
</head>
<body>
<div id="first">{{ output }}</div>
<script>
var v = new Vue({
el: '#first',
template: '<p>{{ meth }}</p>',
data: {
meth: 'welcome user have a nice day'
},
methods: {
setMeth: function (meth) {
var s = this;
s.meth = meth;
s.$nextTick(function () {
console.log(s.$el.textContent);
});
}
}
});
v.setMeth('Have a Nice day');
</script>
</body>
</html>

Output:

have a nice day

In the above three examples we have used the nextTick() method in different ways. We have used some mathematical calculations and terms like pi etc also it is related with the other predefined methods and functionality of the applications with user-requirements. But we used nextTick() datas is updated whenever it changed the html DOM elements also changed in the browser.

Conclusion

When we use vue.js specifically the nextTick() function in web based applications its mostly rare usages and moreover it also a user-friendly environment for users. Because nextTick() and other methods in Vue.js it’s a static method and they are related with the global APIs so we can use it with anywhere of the scripts if it’s really needed and their instance is used with the throughout the vue.js scripts.

Recommended Articles

This is a guide to Vue.js nextTick. Here we discuss the introduction, syntax, and working of nexttick in vue.js along with different examples and code implementation. You may also have a look at the following articles to learn more –

  1. Vue.js Computed
  2. Angular 2 vs Vue JS
  3. Vue.JS vs React.JS
  4. Vue.js vs Angular
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