Please input a number that falls within a specified range

Question

Please input a number that falls within a specified range

I need help with two text inputs that are connected v-model to a ref object. I also have two other refs, minimum (100) and maximum(1000). My goal is to allow users to input values within the range of the minimum and maximum values provided. If the value entered falls below the minimum, it should automatically default to 100. Similarly, if the value exceeds the maximum, it should default to 1000.

<input type="text" v-model="number.one" class="one" @input="validate"/> 
<input type="text" v-model="number.two" class="two" @input="validate"/>

const min = ref(100)
const max = ref(1000)

const numbers = ref({
   one: 100,
   two: 100
}) 

const validate = () => {
    if(e.target.className === 'one'){
      if(numbers.value.one <= min.value){
         numbers.value.one = min.value
      }else if(numbers.value.one > max.value){
         numbers.value.one = max.value
      }
    }
}

After implementing this, I encountered an issue where I could no longer input any values in the input field. I suspect this is because numbers.value.one is now equal to the minimum which restricts further modification. How can I overcome this limitation and still be able to update the values?

javascript vue.js

Answer 1

Answer №1

To easily check the minimum and maximum values for input fields, you can simply adjust their HTML properties without the need for additional validation steps.

<template>
  <input type="number" v-model="numbers.two" :max="max"/>
  <input type="number" v-model="numbers.one" :min="min"/>
</template>

<script setup lang="js">

import { reactive, ref } from 'vue';

const min = ref(100);
const max = ref(1000);

const numbers = reactive({
  one: 100,
  two: 100,
});
</script>

However, if you insist on validating every value change, then you will need to validate the ranges during input or change events.

<template>
  <input type="text" v-model="numbers.one" class="one" @input="validateMax"/>
  <input type="text" v-model="numbers.two" class="two" @change="validateMin"/>
  <!--  <input type="text" v-model="numbers.two" class="two" @input="validateMin"/>-->
</template>

<script setup lang="js">

import { reactive, ref } from 'vue';

const min = ref(100);
const max = ref(1000);

const numbers = reactive({
  one: 100,
  two: 100,
});

function validateMax() {
  numbers.one = Math.min(Number(numbers.one), max.value);
}

function validateMin() {
  numbers.two = Math.max(Number(numbers.two) || 0, min.value);
}

</script>

In this scenario, each new value is checked against the minimum and maximum values with every change, updating the model accordingly.

There are certain edge cases that should be taken into consideration. For example, continuously checking the minimum value with each input event may disrupt the user experience. If your minimum value is set at 100 and a user tries to enter 250, the validation trigger might convert it to 100 prematurely. Therefore, employing the change event is more suitable in this situation.

Note 1: Using v-model.number for numeric bindings is considered a best practice.

Note 2: Utilizing type="number" for numerical inputs is also recommended.

Answer 2

To easily check the minimum and maximum values for input fields, you can simply adjust their HTML properties without the need for additional validation steps.

<template>
  <input type="number" v-model="numbers.two" :max="max"/>
  <input type="number" v-model="numbers.one" :min="min"/>
</template>

<script setup lang="js">

import { reactive, ref } from 'vue';

const min = ref(100);
const max = ref(1000);

const numbers = reactive({
  one: 100,
  two: 100,
});
</script>

However, if you insist on validating every value change, then you will need to validate the ranges during input or change events.

<template>
  <input type="text" v-model="numbers.one" class="one" @input="validateMax"/>
  <input type="text" v-model="numbers.two" class="two" @change="validateMin"/>
  <!--  <input type="text" v-model="numbers.two" class="two" @input="validateMin"/>-->
</template>

<script setup lang="js">

import { reactive, ref } from 'vue';

const min = ref(100);
const max = ref(1000);

const numbers = reactive({
  one: 100,
  two: 100,
});

function validateMax() {
  numbers.one = Math.min(Number(numbers.one), max.value);
}

function validateMin() {
  numbers.two = Math.max(Number(numbers.two) || 0, min.value);
}

</script>

In this scenario, each new value is checked against the minimum and maximum values with every change, updating the model accordingly.

There are certain edge cases that should be taken into consideration. For example, continuously checking the minimum value with each input event may disrupt the user experience. If your minimum value is set at 100 and a user tries to enter 250, the validation trigger might convert it to 100 prematurely. Therefore, employing the change event is more suitable in this situation.

Note 1: Using v-model.number for numeric bindings is considered a best practice.

Note 2: Utilizing type="number" for numerical inputs is also recommended.

Please input a number that falls within a specified range

Answer №1

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