Chapter 29: Learn about Event Listener with Balloon Popping Project in LWC

Hello Friends, in this chapter we will build Balloon Popping Project using Lightning Web Component.

Note: I have used addEventListener to build this project so that you have good understanding of event listeners though there are more ways to build this project.

Topics Covered :

• DOM Event Listener
• Code Snippet

app.html

<template>
    <div class="wrapper">
           <h1>Pop the balloons by moving</br>your mouse over them</h1>
           <div class="yay-no-balloons"><span class="blue">Wow!</span> All balloons popped!</div>
           <div class="balloon-gallery">
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
            <div class="balloon"></div>
           </div>
       </div>
   </template>

app.js

import { LightningElement } from 'lwc';

export default class App extends LightningElement {
 popped = 0;
 textmsg = 'pop';

    constructor(){
        super();
        this.template.addEventListener('mouseover',this.buttonClicked);
    }
       
    buttonClicked=(event)=>{
      if (event.target.className === "balloon"){
                event.target.style.backgroundColor = "#ededed";    
                event.target.innerHTML ='POP';    
                this.popped++
                this.checkAllPopped();
    }   

};
     checkAllPopped(){
    if (this.popped === 20){
        console.log('all popped!');
         const gallery = this.template.querySelector('.balloon-gallery');
         const message = this.template.querySelector('.yay-no-balloons');
       // gallery.innerHTML = '';
       message.style.display = 'block';
    }
    }
}

app.css

body{
    font-family:sans-serif;
    padding: 30px;
    background:#ededed;
}

.wrapper{
    max-width: 690px;
    margin: 0 auto;
}

.blue {
    color:#3f7abe;
}

h1{
    margin: auto;
    margin-top: 50px;
    margin-bottom: 50px;
    color: #08a3d9;
    text-transform: uppercase;
    font-size: 30px;
    color: #000380;
}

.balloon-gallery div{
    background: #ff3300;
    height: 121px;
    width: 119px;
    text-align: center;
    color: #ff3300;
    font-size: 40px;
    font-family: sans-serif, arial;
    border-radius: 100%;
    margin-top: 20px;
    display: inline-block;
    /* float: left; */
    margin: 2.5px 5 px 2.5px 0px;
}

.balloon-gallery div:nth-child(3n){
    background: #ffce00;
    color: #ffce00;
}

.balloon-gallery div:nth-child(2n){
    background:#3f7abe;
    color:#3f7abe;
}

.balloon-gallery div:nth-child(5n){
    background:#8e7a8e;
    color:#8e7a8e;
}

.balloon-gallery div:nth-child(13){
    background:#8e7a8e;
    color:#8e7a8e;
}

.balloon-gallery div:nth-child(10n){
    background:#ff3300;
    color: #ff3300;
}

.balloon-gallery div:nth-child(4n){
    clear:right;
}

.yay-no-balloons {
    display:none;
    color:#ff3300;
    font-size:100px;
}

Hope you enjoyed the chapter !

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