In Vue.js, the minus button will automatically disappear once the value reaches 0, and the plus button will reappear

I am trying to implement a functionality where, when the minus button is clicked and the value reaches 0, the minus button gets hidden and the plus button becomes visible again to add values. I have managed to make the minus and plus buttons work but need assistance with hiding/showing them in Vue.js as I am still new to it.

<template>
  <div class="message"># {{ count }}<br>
    <p># {{ count }}</p>
    <button v-on:click.prevent="increment">+</button>
    <button v-on:click.prevent="decrement">-</button>
  </div>
</template>
    
<script>
export default {
  data: ()=> {
    return {
      count: 5
    }
  },
  methods: {
    increment() {
      this.count++;
    },
    decrement() {
      if(this.count > 0) {
        this.count-- ;
      }
    }
  }
}
</script>

Answer №1

If you want to conceal the dash symbol when the count is zero, use the following code:

<button v-if="count > 0" v-on:click.prevent="decrement">-</button>

Answer №2

To control the visibility of elements based on a value, you can utilize the v-show directive along with the count variable:

const app = new Vue({
  el: '#app',
  data() {
    return {
      count: 5
    }
  },
  methods: {
    increment() {
      this.count++;
    },
    decrement() {
      if (this.count > 0) {
        this.count--;
      }
    }
  }
})
<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="f290931305779b9791879a">[email protected]</a>/dist/vue.js"></script>
<div id="app">
  <div class="message">
    <p># {{ count }}</p>
    <button v-show="count >= 0" v-on:click.prevent="increment">+</button>
    <button v-show="count > 0" v-on:click.prevent="decrement">-</button>
  </div>
</div>

Answer №3

Consider implementing v-if

new Vue({
  el: '#example',
  data: ()=> {
    return {
      value: 10
    }
  },
  methods: {
    add () {
      this.value++;
    },
    subtract () {
      if(this.value > 0){
        this.value-- ;
      }
    }
  }
})

Vue.config.productionTip = false
Vue.config.devtools = false
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="example">
      <div class="content"># {{ value }}<br>
        <p># {{ value }}</p>
        <button v-on:click.prevent="add" >+</button>
        <button v-on:click.prevent="subtract" v-if="value">-</button>
    </div>
</div>

Answer №4

v-if is a directive that will display an element if the condition it's checking for is true. On the other hand, v-show will always render the element in the DOM, but only show it if the condition is met.

To achieve your goal of controlling visibility based on certain conditions, you can use v-if="count > 0" or v-show="count > 0" on the minus button.

<button v-if="count >= 0" v-on:click.prevent="decrement">-</button>

Similarly, if you want to restrict the count from exceeding a maximum value, you can utilize

v-if="count < max_value"
or
v-show="count < max_value"
to hide the increment button when the count reaches its peak.

I hope this information proves helpful :) For more details, feel free to refer to the documentation available here: https://v2.vuejs.org/v2/guide/index.html#Conditionals-and-Loops

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