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

Similar questions

Can a value be concealed within a dropdown list on a form (using PHP or JavaScript)?

The color of the letters from the user textbox input changes every second

How can I properly integrate multer with Node and Express in this situation?

A guide to increasing a loop counter in Vue

The controller in Angular uses the $scope symbol _

Guide to creating the onclick feature for a dynamic button in Meteor

Having trouble integrating a custom dialog with DirtyForms plugin

Is Axios phasing out support for simultaneous requests?

The pencil-drawn pixel on the canvas is positioned off-center

What advantages does the Step function (AWS) offer compared to setTimeout (Javascript) for scheduling tasks?

How can I send an array of date and time values from a Vue.js component to an ASP.NET Core API?

Animate a div component sliding out while seamlessly introducing a new one using React

The functionality of the delete button in Material UI Chip seems to be malfunctioning

Loop through each row in the Datatable and access the details or child

What causes Vue.js's store to clear upon refreshing with Node.js? Additionally, how can uploaded images be utilized within Vue.js?

What could be causing the issue with saving form data to local storage in React?

Guide on creating a menu that remains open continuously through mouse hovering until the user chooses an option from the menu

Encountering a Laravel Vue issue while attempting to implement chart.js using the Laravel-charts package

Fixing Cross-Browser Issues with the OnScroll Function

Looking to eliminate the bullet point next to the labels on a highcharts graph?