Learn about Event and parameter pass in Vue3 JS – 3

This chapter provide the example of how to pass event and parameter in the method

Example:

In this example, we can see, how to call method on button click event for that I have added 2 buttons, Add and Subtract to increase and decrease the counter respectively, and pass the event and parameter to methods.

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Vue Basics</title>
    <link
      href="https://fonts.googleapis.com/css2?family=Jost:wght@400;700&display=swap"
      rel="stylesheet"
    />
    <link rel="stylesheet" href="styles.css" />
    <script src="https://unpkg.com/vue@next" defer></script>
    <script src="app.js" defer></script>
  </head>
  <body>
    <header>
      <h1>Vue Events</h1>
    </header>
    <section id="userevents">
      <h2>Native event/ Parameter pass </h2>
      <button v-on:click="add(10)">Add 10</button>
      <button v-on:click="subtract(5)">Subtract 5</button>
      <p>Result: {{ counter }}</p>
      <input type="text" v-on:input="setName($event, 'Sawant')">
      <p>Your Name: {{ name }}</p>
    </section>
  </body>
</html>

app.js

const app = Vue.createApp({
  data() {
    return {
      counter: 0,
      name: "",
    };
  },
  methods: {
    setName(event, lastName) {
      this.name = event.target.value + " " + lastName;
    },
    add(num) {
      this.counter = this.counter + num;
    },
    subtract(num) {
      this.counter = this.counter - num;
      // this.counter--;
    },
  },
});

app.mount("#userevents");

style.css

* {
  box-sizing: border-box;
}

html {
  font-family: 'Jost', sans-serif;
}

body {
  margin: 0;
}

header {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.26);
  margin: 3rem auto;
  border-radius: 10px;
  padding: 1rem;
  background-color: #2196e4;
  color: white;
  text-align: center;
  width: 90%;
  max-width: 40rem;
}

#userevents {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.26);
  margin: 3rem auto;
  border-radius: 10px;
  padding: 1rem;
  text-align: center;
  width: 90%;
  max-width: 40rem;
}

#userevents h2 {
  font-size: 2rem;
  border-bottom: 1px solid #ccc;
  color: #2196e4;
  margin: 0 0 1rem 0;
}

#userevents p {
  font-size: 1.25rem;
  font-weight: bold;
  border: 1px solid #2196e4;
  background-color: #2196e4;
  color: white;
  padding: 0.5rem;
  border-radius: 5px;
}

#userevents input {
  font: inherit;
  border: 1px solid #ccc;
}

#userevents input:focus {
  outline: none;
  border-color: #2196e4;
  background-color: #e4edfc;
}

#userevents button {
  font: inherit;
  cursor: pointer;
  border: 1px solid #0355b3;
  background-color: #0355b3;
  color: white;
  padding: 0.05rem 1rem;
  box-shadow: 1px 1px 2px rgba(0, 0, 0, 0.26);
  border-radius: 20px;
  margin: 0 1rem;
}

#userevents button:hover,
#userevents button:active {
  background-color: #0355b3;
  border-color: #0355b3;
  box-shadow: 1px 1px 4px rgba(0, 0, 0, 0.26);
}

Output: