call external javascript functions inside vue instance

Question

Below is the set of external javascript functions that I'm calling from a vue instance

// debounce
function debounce(func, wait, immediate) {
    let timeout;
    
    return function() {
        let context = this, args = arguments;
        later = function() {
            timeout = null;
            if (!immediate) func.apply(context, args);
        };
    
        let callNow = immediate && !timeout;

        clearTimeout(timeout);

        timeout = setTimeout(later, wait);

        if (callNow) func.apply(context, args);
    };
}
// -- end debounce

// animate css
function animateCss(element, animationName, callback) {
    const node = document.querySelector(element)
    node.classList.add('animated', animationName)
    
    function handleAnimationEnd() {
        node.classList.remove('animated', animationName)
        node.removeEventListener('animationend', handleAnimationEnd)
    
        if (typeof callback === 'function') callback()
    }
    
    node.addEventListener('animationend', handleAnimationEnd);
}
// -- end animate css

and my vue instance

new Vue({
    el: '#app',
    template: '#search-tpl',
    methods: {
        onKeyDown: debounce(function(){
            animateCss('#searchboxui-wrapper', 'fadeOutDown',function(){
                document.querySelector('#searchboxui-wrapper').style.display = 'none';  
            });
        }
    }
})

but it always throws me undefined, even if I declare the axios package or socketio package, it throws me undefined, any help, ideas please?

PS: I'm using Vue CLI 3

How do you import the things you wanna use in Search.vue ? — user10686911
– user10686911, Commented Feb 14, 2019 at 13:41
Are you using webpack or any other build process, or just including vue.js directly into a .html page? (If you're using .vue files you just need to import whatever external libraries each component is using, so webpack knows to include them). Can you show the code where you're currently trying to "declare the axios package"? — Daniel Beck
– Daniel Beck, Commented Feb 14, 2019 at 13:43
Ah, that's probably the problem. You need to declare the import in the vue file where you're using the imported code, not in app.vue. — Daniel Beck
– Daniel Beck, Commented Feb 14, 2019 at 15:32
Does your external file export the functions? @niklaz's answer below shows exactly how this should work. If that doesn't seem to fix it, please show the import / export code in the question, it's hard to debug based on a description. — Daniel Beck
– Daniel Beck, Commented Feb 14, 2019 at 15:49

Mr.Singh · Accepted Answer · 2022-01-30 06:15:52Z

2

Create external js file, say externals.js, use import to import everything or specific functions from this file and use them in your Vue code:

Content in externals.js:

// debounce
function debounce(func, wait, immediate) {
    let timeout;

    return function() {
        let context = this, args = arguments;
        later = function() {
            timeout = null;

            if (!immediate) func.apply(context, args);
        };
        
        let callNow = immediate && !timeout;

        clearTimeout(timeout);

        timeout = setTimeout(later, wait);

        if (callNow) func.apply(context, args);
    };
}
// -- end debounce
        
// animate css
function animateCss(element, animationName, callback) {
    const node = document.querySelector(element)
    node.classList.add('animated', animationName)
        
    function handleAnimationEnd() {
        node.classList.remove('animated', animationName)
        node.removeEventListener('animationend', handleAnimationEnd)
        
        if (typeof callback === 'function') callback()
    }
        
    node.addEventListener('animationend', handleAnimationEnd);
}
// -- end animate css

export {debounce, animateCss}

Content in VueJS:

import {debounce, animateCss} from '../../js/externals.js'
    
new Vue({
    el: '#app',
    template: '#search-tpl',
    methods: {
        onKeyDown() {
            debounce(function() {
                animateCss('#searchboxui-wrapper', 'fadeOutDown', function() {
                    document.querySelector('#searchboxui-wrapper').style.display = 'none';
                });
            });
        }
    }
});

edited Jan 30, 2022 at 6:15

Mr.Singh

2,0457 gold badges32 silver badges64 bronze badges

answered Feb 14, 2019 at 14:02

Nikola Kirincic

3,7871 gold badge28 silver badges32 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Nikola Kirincic Over a year ago

@JuliverGalleto, can you update the question with corrected sample? It should be working. If it is not working, then something else is the cause of error

Collectives™ on Stack Overflow

call external javascript functions inside vue instance

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related