How to use the v-model to round up a number in Vue.js

Question

How to use the v-model to round up a number in Vue.js

I need to round up a number in my input field:

    <b-form-input id="amount_input" type="number"
     v-model="Math.ceil(form.contract.reward_cents / 100)"
      :state="validate(form.contract.reward_cents)"/>

After trying Math.ceil(), I encountered an error

Can anyone provide assistance on how to resolve this issue?

This is the solution I came up with:

    computed: {
        reward_cents () {
           return Math.ceil(this.form.contract.reward_cents / 100);       
        },
    }

<template>
<b-form-input id="amount_input" type="number" v-model="reward_cents"
    :state="validate(form.contract.reward_cents)"/>
</template>

javascript vue.js vuejs2

Answer 1

Answer №1

Perhaps utilizing a computed property within the context of v-model could be a solution instead of relying on a traditional expression.

<b-form-input id="amount_input" type="number"
     v-model="reward_cents"
      :state="reward_cents"/>

<script>
  export default {
    computed: {
      reward_cents: {
        get() {
          return this.form.contract.reward_cents;
        },
        set(val) {
          this.form.contract.reward_cents = Math.ceil(val / 100);
        }
      }
    }
  }
</script>

Answer 2

Perhaps utilizing a computed property within the context of v-model could be a solution instead of relying on a traditional expression.

<b-form-input id="amount_input" type="number"
     v-model="reward_cents"
      :state="reward_cents"/>

<script>
  export default {
    computed: {
      reward_cents: {
        get() {
          return this.form.contract.reward_cents;
        },
        set(val) {
          this.form.contract.reward_cents = Math.ceil(val / 100);
        }
      }
    }
  }
</script>

Answer 3

Answer №2

Here is an example of a form input with Vue.js:

<b-form-input 
id="quantity_input" 
type="text"
:value="formData.quantity"
v-model="formData.quantity"
@change="updateData"
:state="validate(formData.quantity)"/>

data(){
    return: {
        formData: {
            quantity: 0
        }
    }
}

methods: {
    updateData(newQuantity){
        this.formData.quantity = parseFloat(newQuantity);
    }
}

Answer 4

Here is an example of a form input with Vue.js:

<b-form-input 
id="quantity_input" 
type="text"
:value="formData.quantity"
v-model="formData.quantity"
@change="updateData"
:state="validate(formData.quantity)"/>

data(){
    return: {
        formData: {
            quantity: 0
        }
    }
}

methods: {
    updateData(newQuantity){
        this.formData.quantity = parseFloat(newQuantity);
    }
}

How to use the v-model to round up a number in Vue.js

Answer №1

Answer №2

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