Attempting to format a number using a computed property and .toLocaleString() fails to execute

Question

Attempting to format a number using a computed property and .toLocaleString() fails to execute

I am facing an issue with the formatting of a number displayed in a <p></p> element. The number is coming from a range input element that is bound to an amount data property using v-model. Even though I have a computed property to format the number, it doesn't appear correctly.

What I want to see

12,000

What I am seeing

Check out this demo

new Vue({
      el: "#app",
      data: {
        amount: 0
      },
      computed: {
        formattedAmount(){
          return this.amount.toLocaleString()
        }
      }
    })

body {
      background: #20262E;
      padding: 20px;
      font-family: Helvetica;
    }

    #app {
      background: #fff;
      border-radius: 4px;
      padding: 20px;
      transition: all 0.2s;
    }

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>

    <div id="app">
      <h2>Range Formatter</h2>
      <p>{{formattedAmount}}</p>
      <input type="range" id="range" v-model="amount" min="0" max="1000000">
    </div>

javascript vue.js vue-component

Answer 1

Answer №1

It seems that you're currently using toLocaleString on a string instead of a number, which is why the formatting isn't being applied as expected. To fix this, make sure to include the number modifier in your v-model.

v-model.number="amount"

Vue by default treats all values from <input> elements as strings, even when they should be numbers. By adding the number modifier, Vue will convert the string into a number before updating the bound property.

new Vue({
  el: "#app",
  data: {
    amount: 0
  },
  computed: {
    formattedAmount() {
      return this.amount.toLocaleString()
    }
  }
})

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>

<div id="app">
  <h2>Range Formatter</h2>
  <p>{{formattedAmount}}</p>
  <input type="range" id="range" v-model.number="amount" min="0" max="1000000">
</div>

Answer 2

It seems that you're currently using toLocaleString on a string instead of a number, which is why the formatting isn't being applied as expected. To fix this, make sure to include the number modifier in your v-model.

v-model.number="amount"

Vue by default treats all values from <input> elements as strings, even when they should be numbers. By adding the number modifier, Vue will convert the string into a number before updating the bound property.

new Vue({
  el: "#app",
  data: {
    amount: 0
  },
  computed: {
    formattedAmount() {
      return this.amount.toLocaleString()
    }
  }
})

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>

<div id="app">
  <h2>Range Formatter</h2>
  <p>{{formattedAmount}}</p>
  <input type="range" id="range" v-model.number="amount" min="0" max="1000000">
</div>

Answer 3

Answer №2

One issue to address is that the value returned by this.amount is a string. To work with it as a number, you'll need to convert it first like this:

formattedAmount() {
   return Number(this.amount).toLocaleString();
}

new Vue({
  el: "#app",
  data: {
    amount: 0
  },
  computed: {
    formattedAmount() {
      return Number(this.amount).toLocaleString()
    }
  }
})

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>

<div id="app">
  <h2>Range Formatter</h2>
  <p>{{formattedAmount}}</p>
  <input type="range" id="range" v-model="amount" min="0" max="1000000">
</div>

Alternatively, you can utilize a .number modifier to automatically convert user input into a Number like so:

<input v-model.number="amount" type="range" id="range" min="0" max="1000000">

new Vue({
  el: "#app",
  data: {
    amount: 0
  },
  computed: {
    formattedAmount() {
      return this.amount.toLocaleString()
    }
  }
})

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>

<div id="app">
  <h2>Range Formatter</h2>
  <p>{{formattedAmount}}</p>
  <input type="range" id="range" v-model.number="amount" min="0" max="1000000">
</div>

Answer 4

One issue to address is that the value returned by this.amount is a string. To work with it as a number, you'll need to convert it first like this:

formattedAmount() {
   return Number(this.amount).toLocaleString();
}

new Vue({
  el: "#app",
  data: {
    amount: 0
  },
  computed: {
    formattedAmount() {
      return Number(this.amount).toLocaleString()
    }
  }
})

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>

<div id="app">
  <h2>Range Formatter</h2>
  <p>{{formattedAmount}}</p>
  <input type="range" id="range" v-model="amount" min="0" max="1000000">
</div>

Alternatively, you can utilize a .number modifier to automatically convert user input into a Number like so:

<input v-model.number="amount" type="range" id="range" min="0" max="1000000">

new Vue({
  el: "#app",
  data: {
    amount: 0
  },
  computed: {
    formattedAmount() {
      return this.amount.toLocaleString()
    }
  }
})

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>

<div id="app">
  <h2>Range Formatter</h2>
  <p>{{formattedAmount}}</p>
  <input type="range" id="range" v-model.number="amount" min="0" max="1000000">
</div>

Attempting to format a number using a computed property and .toLocaleString() fails to execute

Check out this demo

Answer №1

Answer №2

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