Limit the maximum value for a NUMBER input in vue - a step-by-step guide!

Question

Limit the maximum value for a NUMBER input in vue - a step-by-step guide!

Currently, I am attempting to develop a new input function that will reject any number entered by the user if it exceeds a specified limit. However, I have encountered some issues with this.

Let's assume the maximum allowed number is 99. Currently, my approach involves creating something along these lines:

<input
    type="text"
    :maxlength="2"
    aria-controls="none"
    class="number-field-input"
    inputmode="numeric"
    pattern="/d+"
    v-model="inputOne"
  />

By setting the maxlength to 2, this effectively limits the maximum allowed number to 99. However, this method is not ideal and does not work as intended. I am looking for an alternative solution like the following:

<input
        type="number"
        min="1"
        max="99" //could be any value between 1 and 99
        aria-controls="none"
        class="number-field-input"
        inputmode="numeric"
        pattern="/d+"
        v-model="inputOne"
   />

javascript vue.js vuejs3

Answer 1

Answer №1

If you want to monitor changes, you can use a watcher in Vue:

const { ref, watch } = Vue
const app = Vue.createApp({
  setup() {
    let inputOne = ref(0)
    watch(inputOne,
      (newValue) => {
        inputOne.value = newValue > 99 ? 99 : newValue
      },
    );
    return { inputOne };
  },
})
app.mount('#demo')

<script src="https://unpkg.com/vue@3/dist/vue.global.prod.js"></script>
<div id="demo">
<div>
  <input
    type="number"
    min="1"
    max="99" 
    aria-controls="none"
    class="number-field-input"
    inputmode="numeric"
    pattern="/d+"
    v-model="inputOne"
   />
</div>

Answer 2

If you want to monitor changes, you can use a watcher in Vue:

const { ref, watch } = Vue
const app = Vue.createApp({
  setup() {
    let inputOne = ref(0)
    watch(inputOne,
      (newValue) => {
        inputOne.value = newValue > 99 ? 99 : newValue
      },
    );
    return { inputOne };
  },
})
app.mount('#demo')

<script src="https://unpkg.com/vue@3/dist/vue.global.prod.js"></script>
<div id="demo">
<div>
  <input
    type="number"
    min="1"
    max="99" 
    aria-controls="none"
    class="number-field-input"
    inputmode="numeric"
    pattern="/d+"
    v-model="inputOne"
   />
</div>

Answer 3

Answer №2

To achieve this, all you need is a single line of code utilizing the @input event.

Check out the Demo below:

new Vue({
  el: '#app',
  data: {
    value: 0
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
  <input type="number" v-model="value" @input="() => { if(value > 150 || value < 0) { value = 150 }}">
</div>

Answer 4

To achieve this, all you need is a single line of code utilizing the @input event.

Check out the Demo below:

new Vue({
  el: '#app',
  data: {
    value: 0
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
  <input type="number" v-model="value" @input="() => { if(value > 150 || value < 0) { value = 150 }}">
</div>

Answer 5

Answer №3

My implementation looks something like this:

import { ref } from 'vue'

const min = ref(50)
const max = ref(50)
const maxError = ref(false)

const validateMin = () => {
  maxError.value = false
  if (min.value < 50) {
    min.value = 50
  } else if (min.value > 20000) {
    min.value = 20000
  } else if (min.value > max.value) {
    maxError.value = true
  }
}
const validateMax = () => {
  maxError.value = false
  if (max.value < 50) {
    max.value = 50
  } else if (max.value > 20000) {
    max.value = 20000
  } else if (max.value < min.value) {
    maxError.value = true
  }
}

Here is the HTML code snippet I have in place:

<label for="min">Minimum</label>
                  <input
                    type="number"
                    name="min"
                    id="min"
                    v-model="min"
                    @blur="validateMin()"
                    placeholder="At least"
                  />
         
                  <label for="max">Maximum</label>
                  <input
                    type="number"
                    name="max"
                    id="max"
                    v-model="max"
                    @blur="validateMax()"
                    placeholder="At most"
                  />
              

                <small v-if="maxError" class="col-span-2 text-red-600"
                  >The maximum value cannot be less than the minimum value!</small>

Answer 6

My implementation looks something like this:

import { ref } from 'vue'

const min = ref(50)
const max = ref(50)
const maxError = ref(false)

const validateMin = () => {
  maxError.value = false
  if (min.value < 50) {
    min.value = 50
  } else if (min.value > 20000) {
    min.value = 20000
  } else if (min.value > max.value) {
    maxError.value = true
  }
}
const validateMax = () => {
  maxError.value = false
  if (max.value < 50) {
    max.value = 50
  } else if (max.value > 20000) {
    max.value = 20000
  } else if (max.value < min.value) {
    maxError.value = true
  }
}

Here is the HTML code snippet I have in place:

<label for="min">Minimum</label>
                  <input
                    type="number"
                    name="min"
                    id="min"
                    v-model="min"
                    @blur="validateMin()"
                    placeholder="At least"
                  />
         
                  <label for="max">Maximum</label>
                  <input
                    type="number"
                    name="max"
                    id="max"
                    v-model="max"
                    @blur="validateMax()"
                    placeholder="At most"
                  />
              

                <small v-if="maxError" class="col-span-2 text-red-600"
                  >The maximum value cannot be less than the minimum value!</small>

Limit the maximum value for a NUMBER input in vue - a step-by-step guide!

Answer №1

Answer №2

Answer №3

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